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  • 1
    Call number: AWI G5-09-0015
    In: Developments in paleoenvironmental research, Vol. 13
    Description / Table of Contents: This book is the first synthesis of sedimentary geology and paleoceanography of the South China Sea on the basis of extensive industrial explorations and scientific expeditions culminated with the ODP Leg 184. It provides up-to-date knowledge about the history of this largest marginal sea in the West Pacific, deep-sea records of evolution and variations of the East Asian monsoon, and geological backgrounds of the off-shore petroleum basins. With its focus on paleoceanography and sedimentology, this volume provides a comprehensive all-round view of the marginal sea basin, from modern oceanography to sequence stratigraphy. The South China Sea: Paleoceanography and Sedimentology is essential reading for advanced students and researchers working in marine geology, basin evolution, sedimentology, paleoceanography and related fields.
    Type of Medium: Monograph available for loan
    Pages: X, 506 S. : Ill., graph. Darst., Kt.
    ISBN: 9781402097447
    Series Statement: Developments in paleoenvironmental research 13
    Language: English
    Note: Contents: 1 Introduction / Pinxian Wang and Qianyu Li. - References. - 2 Oceanographical and Geological Background / Pinxian Wang and Qianyu Li. - Introduction. - 2.1 Bathymetry and Geomorphology. - 2.2 Oceanography. - Monsoon. - Surface Circulation. - Surface Temperature and Salinity. - Thermocline and Upwelling. - Water Exchange with Pacific and Kuroshio Intrusion. - Deep Water Circulation. - Other Oceanographic Features. - Oceanographic Summary. - 2.3 Tectonic History and Sedimentary Basins. - Prior Terrains and Opening of the SCS. - Step-Wise Closure of the Sea Basin. - Formation of Shelf-Slope Sedimentary Basins. - Sediments of the SCS Shelf-Slope Basins: An Overview. - Summary of Tectonics and Basin Formation. - References. - 3 Stratigraphy and Sea Level Changes. - Introduction. - 3.1 Lithostratigraphic Overview / (Li Q. and Zhong G.). - Pre-Cenozoic Basement. - Lithostratigraphy of Syn-Rift Sediments. - Post-Rift Sediments in Shelf-Slope Basins. - Deep Water Lithostratigraphy. - 3.2 Biostratigraphic Framework / (Li Q.). - Floral and Shallow-Water Faunal Assemblages. - Planktonic Foraminiferal and Nannofossil Biostratigraphy. - Quaternary Lithobiostratigraphic Events. - 3.3 Isotopic and Astronomical Stratigraphy / (Tian J. and Li Q.). - Neogene Isotopic Records at Site 1148. - Pliocene–Pleistocene Isotopic Records at Site 1143. - 3.4 Stratigraphy of Major Shelf and Slope Basins / (Zhong G. and Li Q.). - Northern South China Sea Basins. - Southern South China Sea Basins. - 3.5 Regional Sea Level Changes / (Zhong G. and Li Q.). - Late Quaternary Sea Level Changes. - Long-Term Sea Level Changes Since the Oligocene. - New Approach Toward Fine-Scale Sea Level Magnitude. - Summary of South China Sea stratigraphy. - References. - 4 Sedimentology. - Introduction. - 4.1 Surface Deposition Patterns / (Liu Z.). - Deposit Distribution Patterns. - Sediment Transport. - 4.2 Terrigenous Deposition / (Liu Z.). - Clay Mineralogy and Geochemistry of Source Areas. - Clay Minerals. - Geochemistry. - Terrigenous Sediment Supply in Glacial Cycles. - Long-Term Changes of Terrigenous Sediment Supply. - 4.3 Biogenic Deposition. - Carbonate / (Li J. and Wang P.). - Opal / (Wang R.). - 4.4 Coral Reefs / (Yu K. and Zhao J.). - Modern Coral Reef Distribution. - Carbonate Platform Sediments and Calcium Carbonate Production. - Reef History. - 4.5 Volcanic Deposition / (Liu Z.). - Volcanic Rock Distribution. - Volcanic Ash Records. - Case Studies: Pinatubo, Toba. - 4.6 Estimation of Deposit Mass Since the Oligocene / (Huang W. and Wang P.). - Data Sources and Analyses. - Sediment Distribution and Mass. - Estimation of Terrigenous and Carbonate Masses. - Depositional Patterns. - Major Characteristics of SCS Sedimentation. - References. - 5 Upper Water Structure and Paleo-Monsoon. - Introduction. - 5.1 Sea Surface Temperature History / (Jian Z. and Tian J.). - SST Proxies. - Paleo-SST Reconstruction. - Paleo-SST Patterns. - 5.2 Thermocline Depth History / (Tian J. and Jian Z.). - Proxies of Thermocline Depth. - Paleo-Thermocline Depth. - 5.3 Vegetation History in Deep-Sea Record / (Sun X.). - Pollen Distribution in Surface Sediments. - Long-Term Evolution. - Last Glacial Pollen Records: North-South Differences. - North-South Comparison of the Vegetation During the LGM. - 5.4 Monsoon History / (Jian Z. and Tian J.). - Monsoon Proxies. - Tectonic-Scale Long-Term Evolution. - Orbital-Scale Variability. - Suborbital-Scale Variability. - Summary. - References. - 6 Deep Waters and Oceanic Connection / Quanhong Zhao, Qianyu Li and Zhimin Jian. - Introduction. - 6.1 Modern Deep Waters and Their Faunal Features. - Marginal Seas in the Western Pacific. - Modern Intermediate and Deep Waters in the South China Sea. - Modern Deep-Sea Benthic Foraminifera and Ostracods. - 6.2 Late Quaternary Deep-Water Faunas and Stable Isotopes. - 6.3 Neogene and Oligocene Deep-Water Benthic Faunas from ODP Leg 184 Sites. - Site 1148 Benthic Foraminifera. - Site 1148 Ostracods. - Faunal Indication of Deep-Water Mass Changes. - 6.4 Deep Water Evolution: Evidence from Carbonate. - Preservation and Isotopes. - Carbonate Dissolution. - Isotopic Records. - 6.5 Oceanic Connection. - Summary. - References. - 7 Biogeochemistry and the Carbon Reservoir. - Introduction. - 7.1 Productivity and Nutrient Dynamics in the Modern South China Sea / (Zhao M.). - Primary Productivity. - Nutrient Supplies. - Community Structure, Export Productivity and Sedimentary Biogenic Content. - 7.2 Paleoproductivity Reconstruction of the South China Sea / (Zhao M.). - Patterns of Productivity Changes During Glacial-Interglacial Oscillations. - Pre-Pleistocene Paleoproductivity Changes. - 7.3 Carbon Reservoir Changes / (Wang P., Tian J. and Li J.). - Modern Carbon Cycling. - Late Quaternary δ13C Cyclicity. - Long-Term Trend of Carbon Isotopes. - Summary. - References. - 8 History of the South China Sea – A Synthesis / Pinxian Wang and Qianyu Li. - Introduction. - 8.1 Evolution of the South China Sea Basin. - Pre-Spreading Stage in the Early Paleogene. - Seafloor Spreading in the Oligocene-Early Miocene. - Post-Spreading Stage Since the Late Miocene. - 8.2 Evolution of the East Asian Monsoon. - Summer Monsoon and Chemical Weathering. - Winter Monsoon and North-South Contrast. - East and South Asian Monsoons. - 8.3 Evolution of Continent-Ocean Interactions. - References. - Index.
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 15 (2014): 4958–4983, doi:10.1002/2014GC005567.
    Description: Combined analyses of deep tow magnetic anomalies and International Ocean Discovery Program Expedition 349 cores show that initial seafloor spreading started around 33 Ma in the northeastern South China Sea (SCS), but varied slightly by 1–2 Myr along the northern continent-ocean boundary (COB). A southward ridge jump of ∼20 km occurred around 23.6 Ma in the East Subbasin; this timing also slightly varied along the ridge and was coeval to the onset of seafloor spreading in the Southwest Subbasin, which propagated for about 400 km southwestward from ∼23.6 to ∼21.5 Ma. The terminal age of seafloor spreading is ∼15 Ma in the East Subbasin and ∼16 Ma in the Southwest Subbasin. The full spreading rate in the East Subbasin varied largely from ∼20 to ∼80 km/Myr, but mostly decreased with time except for the period between ∼26.0 Ma and the ridge jump (∼23.6 Ma), within which the rate was the fastest at ∼70 km/Myr on average. The spreading rates are not correlated, in most cases, to magnetic anomaly amplitudes that reflect basement magnetization contrasts. Shipboard magnetic measurements reveal at least one magnetic reversal in the top 100 m of basaltic layers, in addition to large vertical intensity variations. These complexities are caused by late-stage lava flows that are magnetized in a different polarity from the primary basaltic layer emplaced during the main phase of crustal accretion. Deep tow magnetic modeling also reveals this smearing in basement magnetizations by incorporating a contamination coefficient of 0.5, which partly alleviates the problem of assuming a magnetic blocking model of constant thickness and uniform magnetization. The primary contribution to magnetic anomalies of the SCS is not in the top 100 m of the igneous basement.
    Description: This research is funded by National Science Foundation of China (grant 91028007, grant 91428309), Program for New Century Excellent Talents in University, and Research Fund for the Doctoral Program of Higher Education of China (grant 20100072110036).
    Description: 2015-06-27
    Keywords: Deep tow magnetic survey ; Magnetic anomaly ; Crustal evolution ; Modeling ; International Ocean Discovery Program Expedition 349 ; South China Sea tectonics
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 3
    Publication Date: 2022-05-26
    Description: Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 120 (2015): 1377–1399, doi:10.1002/2014JB011686.
    Description: Coring/logging data and physical property measurements from International Ocean Discovery Program Expedition 349 are integrated with, and correlated to, reflection seismic data to map seismic sequence boundaries and facies of the central basin and neighboring regions of the South China Sea. First-order sequence boundaries are interpreted, which are Oligocene/Miocene, middle Miocene/late Miocene, Miocene/Pliocene, and Pliocene/Pleistocene boundaries. A characteristic early Pleistocene strong reflector is also identified, which marks the top of extensive carbonate-rich deposition in the southern East and Southwest Subbasins. The fossil spreading ridge and the boundary between the East and Southwest Subbasins acted as major sedimentary barriers, across which seismic facies changes sharply and cannot be easily correlated. The sharp seismic facies change along the Miocene-Pliocene boundary indicates that a dramatic regional tectonostratigraphic event occurred at about 5 Ma, coeval with the onsets of uplift of Taiwan and accelerated subsidence and transgression in the northern margin. The depocenter or the area of the highest sedimentation rate switched from the northern East Subbasin during the Miocene to the Southwest Subbasin and the area close to the fossil ridge in the southern East Subbasin in the Pleistocene. The most active faulting and vertical uplifting now occur in the southern East Subbasin, caused most likely by the active and fastest subduction/obduction in the southern segment of the Manila Trench and the collision between the northeast Palawan and the Luzon arc. Timing of magmatic intrusions and seamounts constrained by seismic stratigraphy in the central basin varies and does not show temporal pulsing in their activities.
    Description: This research is funded by National Science Foundation of China (grants 91428309 and 91028007), Program for New Century Excellent Talents in University, and Research Fund for the Doctoral Program of Higher Education of China (grant 20100072110036).
    Description: 2015-09-16
    Keywords: South China Sea ; Seismic stratigraphy ; Seismic facies ; Neotectonism ; IODP Expedition 349 ; Core-well-seismic integration
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 4
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    In:  Supplement to: James, Noel P; Feary, David A; Surlyk, Finn; Toni Simo, J A; Betzler, Christian; Holbourn, Ann E; Li, Qianyu; Matsuda, Hiroki; Machiyama, Hideaki; Brooks, Gregg R; Andres, Miriam S; Hine, Albert C; Malone, Mitchell J; Shipboard Scientific Party (2000): Quaternary bryozoan reef mounds in cool-water, upper slope environments: Great Australian Bight. Geology, 28(7), 647-650, https://doi.org/10.1130/0091-7613(2000)28%3C647:QBRMIC%3E2.0.CO;2
    Publication Date: 2023-06-27
    Description: Bryozoan reef mounds are common features in the geological record, occurring within mid-ramp, slope paleoenvironments, especially in Paleozoic carbonate successions, but until now have not been recorded from the modern ocean. Recent scientific drilling in the Great Australian Bight (Ocean Drilling Program Leg 182) has confirmed the existence of shallow subsurface bryozoan reef mounds in modern water depths of 200-350 m. These structures have as much as 65 m of synoptic relief, and occur both as single mounds and as mound complexes. They are unlithified, have a floatstone texture, and are rich in delicate branching, encrusting and/or nodular-arborescent, flat-robust branching, fenestrate, and articulated zooidal bryozoan growth forms. The muddy matrix is composed of foraminifers, serpulids, fecal pellets, irregular bioclasts, sponge spicules, and calcareous nannofossils. The 14C accelerator mass spectrometry dates of 26.6-35.1 ka indicate that the most recent mounds, the tops of which are 7-10 m below the modern seafloor, flourished during the last glacial lowstand but perished during transgressive sea-level rise. This history reflects changing oceanographic current patterns; strong upwelling during lowstands, and reduced upwelling and lowered trophic resources during highstands. Large specimens of benthic foraminifers restricted to the mounds confirm overall mesotrophic growth conditions. The mounds are similar in geometry, scale, general composition, and paleoenvironments to older structures, but lack obvious microbial influence and extensive synsedimentary cementation. Such differences reflect either short-term local conditions or long-term temporal changes in ocean chemistry and biology.
    Keywords: 182-1131B; AGE; Age, standard deviation; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Great Australian Bight; Joides Resolution; Leg182; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 6 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: 90-594_Site; AGE; Calcium carbonate; COMPCORE; Composite Core; Counting 〉150 µm fraction; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; DSDP/ODP/IODP sample designation; Globigerina bulloides; Globigerina falconensis; Globigerina quinqueloba; Globigerinella aequilateralis; Globigerinita glutinata; Globigerinita uvula; Globigerinoides ruber; Globoconella inflata; Globorotalia crassaformis; Globorotalia crassula; Globorotalia puncticulata; Globorotalia scitula; Globorotalia truncatulinoides; Glomar Challenger; Leg90; Modern analog technique (MAT); Neogloboquadrina dutertrei; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; Orbulina universa; Pulleniatina obliquiloculata; Reference/source; Sample code/label; Sea surface temperature, annual mean; South Pacific/CONT RISE
    Type: Dataset
    Format: text/tab-separated-values, 8160 data points
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  • 6
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    PANGAEA
    In:  Supplement to: Steinke, Stephan; Glatz, Cornelia; Mohtadi, Mahyar; Groeneveld, Jeroen; Li, Qianyu; Jian, Zhimin (2011): Past dynamics of the East Asian monsoon: No inverse behaviour between the summer and winter monsoon during the Holocene. Global and Planetary Change, 78(3-4), 170-177, https://doi.org/10.1016/j.gloplacha.2011.06.006
    Publication Date: 2023-06-27
    Description: Sea-surface (based on Globigerinoides ruber sensu stricto Mg/Ca ratios) and thermocline (based on Pulleniatina obliquiloculata Mg/ca ratios) temperature reconstruction from sediment core MD05-2904 located in the northern SCS for the last 25,000 years.
    Keywords: AGE; CALYPSO; Calypso Corer; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Globigerinoides ruber, Magnesium/Calcium ratio; IMAGES XII - MARCO POLO; Marion Dufresne (1995); MARUM; MD052904; MD05-2904; MD147; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Sea surface temperature; South China Sea; Thermocline water temperature
    Type: Dataset
    Format: text/tab-separated-values, 524 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Li, Qianyu; Jian, Zhimin; Su, Xin (2005): Late Oligocene rapid transformations in the South China Sea. Marine Micropaleontology, 54(1-2), 5-25, https://doi.org/10.1016/j.marmicro.2004.09.008
    Publication Date: 2024-01-09
    Description: Lithobiostratigraphic data indicate that the double reflectors on the seismic profile through Ocean Drilling Program (ODP) Site 1148 represent two unconformities that coincide, respectively, with the lower/upper Oligocene boundary at ~488 mcd, and Oligocene-Miocene boundary at 460 mcd. Two other unconformities, at ~478 and 472 mcd, respectively, were also identified within the upper Oligocene section. Together they erased a sediment record of about 3 Ma from this locality in a period of very active seafloor spreading. The existence of 32.8 Ma marine sediment at the terminated depth (850 mcd) indicates that the initial breakup of the South China Sea (SCS) was probably during 34-33 Ma, close to the Eocene-Oligocene boundary. High sedimentation rates of 60-115 m/my from the much expanded, N350 m lower Oligocene section resulted from rifting and rapid subsidence between 33 and 29 Ma. The mid-Oligocene unconformity at ~28.5 Ma, which also occurred in many parts of the Indo-West Pacific region, was probably related to a significant uplift of the Himalayan-Tibetan Plateau to the west and the initial collision between Indonesia and Australia in the south. A narrowed Indonesian seaway may have accounted for the late Oligocene warming and chalk deposition in the northern South China Sea including the Site 1148 locality. The unconformities and slumps near the Oligocene-Miocene boundary indicate a very unstable tectonic regime, probably corresponding to changes in the rotation of different land blocks and the seafloor spreading ridge from nearly E-W to NE-SW, as recognized earlier at magnetic Anomaly 7. This 25 Ma event also saw the first New Guinea terrane docking at the northern Australian craton. The low sedimentation rate of ~15 m/my in the early to middle Miocene may correspond to another period of rapid seafloor spreading and rapid widespread subsidence that effectively caused sediment source areas to retreat with a rapidly rising sea level. The isostatic nature of these late Oligocene unconformities and slumps with several major collision-uplift events indicate that the rapid changes in the early evolutionary history of the South China Sea were mainly responding to regional tectonic reconfiguration including the uplift-driven southeast extrusion of the Indochina subcontinent.
    Keywords: 184-1148; 184-1148A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg184; Ocean Drilling Program; ODP; South China Sea
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    Format: application/zip, 2 datasets
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  • 8
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    In:  Supplement to: Li, Qianyu; Li, Baohua; Zhong, Guangfa; McGowran, Brian; Zhou, Zuyi; Wang, Jiliang; Wang, Pinxian (2006): Late Miocene development of the western Pacific warm pool: Planktonic foraminifer and oxygen isotopic evidence. Palaeogeography, Palaeoclimatology, Palaeoecology, 237(2-4), 465-482, https://doi.org/10.1016/j.palaeo.2005.12.019
    Publication Date: 2024-01-09
    Description: The disappearance at ~10 Ma of the deep dwelling planktonic foraminifer Globoquadrina dehiscens from the western Pacific including the South China Sea was about 3 Myr earlier than its final extinction elsewhere. Accompanying this event at ~10 Ma was a series of faunal turnover characterized by increase in mixed layer, warm-water species and decrease to a minimum in deepwater species. Paleobiological and isotopic evidence indicates sea surface warming and a deepened local thermocline that we interpret as related to the development of an early western Pacific warm pool. The stepwise decline of G. dehiscens and other deep dwelling species from the NW and SW Pacific suggests more intensive warm water pileup than equatorial localities where surface bypass flow through the narrowing Indonesia seaway appears to remain efficient during the late Miocene. Planktonic delta18O values from the South China Sea consistently lighter than the tropical western Pacific during the Miocene also suggest, similar to today, more variable hydrologic conditions along the periphery than in the core of the warm pool. Stronger hydrologic variability affected mainly by monsoons and increased thermal gradient along the western margin of the late Miocene warm pool may have contributed to the decline of deep dwelling planktonic species including the early extinction of G. dehiscens from the South China Sea region. The late Miocene warm pool became influential and paleobiologically detectable from ~10 Ma, but the modern warm pool did not appear until about 4 Ma, in the middle Pliocene.
    Keywords: 121-758; 122-761; 130-806; 138-846; 138-848; 154-925; 184-1143; 184-1146; 184-1148; 32-310_Site; 68-502_Site; 68-503_Site; 85-573_Site; 89-586_Site; 90-588_Site; 90-590_Site; 90-592; 90-593_Site; 9-77_Site; Caribbean Sea/RIDGE; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean; Joides Resolution; Leg121; Leg122; Leg130; Leg138; Leg154; Leg184; Leg32; Leg68; Leg85; Leg89; Leg9; Leg90; North Pacific/CONT RISE; North Pacific/FLANK; North Pacific/HILL; North Pacific/TROUGH; North Pacific Ocean; Ocean Drilling Program; ODP; South Atlantic Ocean; South China Sea; South Indian Ridge, South Indian Ocean; South Pacific; South Pacific/Tasman Sea/CONT RISE; South Pacific/Tasman Sea/PLATEAU; South Pacific Ocean
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  • 9
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    PANGAEA
    In:  Supplement to: Zheng, Fan; Li, Qianyu; Li, Baohua; Chen, Muhong; Tu, Xia; Tian, Jun; Jian, Zhimin (2005): A millennial scale planktonic foraminifer record of the mid-Pleistocene climate transition from the northern South China Sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 223(3-4), 349-363, https://doi.org/10.1016/j.palaeo.2005.04.018
    Publication Date: 2024-01-09
    Description: A high resolution record (~1100 yr) of planktonic foraminifers from ODP Site 1144 in the northern South China Sea reveals rapid and strongly variable climatic changes during the mid-Pleistocene transition period. The abundance of warm water species decreased from an average of 60% in marine isotope stage (MIS) 29 to 〈40% at MIS 22, followed by a steady increase in cool water species toward younger intervals. Many deep dwelling, warm water species decreased to a minimum during MIS 22 and remained extremely rare or even became absent in younger glacial intervals, indicating stepwise sea surface cooling in the region. Estimated SSTs show large fluctuations mostly at glacial-interglacial transitions. A maximum winter temperature difference of 11 °C (17-28 °C) across MIS 23/22 boundary likely corresponded to a major growth of boreal ice sheets across the MPT center at 0.9 myr, coupled with a strengthened winter monsoon over East Asia . The MPT event not only led to a better correlation between changes in species abundances and glacial-interglacial cycles but also a more constrained thermocline that shoaled considerably during subsequent glacial periods. The oxygen isotope record and the abundance of shallow water species display power spectra closely in pace with the 41,000 and 100,000 years cyclicities. A lower coherence over these cyclicities between deep-water dwelling species and the planktonic delta18O, a shoaled thermocline, and more positive glacial delta18O together suggest disturbances of surface and subsurface waters by intensified winter monsoons over the last 1.1-0.5 myr in the South China Sea.
    Keywords: 184-1144; COMPCORE; Composite Core; Joides Resolution; Leg184; Ocean Drilling Program; ODP; South China Sea
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  • 10
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    In:  Supplement to: Holbourn, Ann E; Kuhnt, Wolfgang; Simo, J A; Li, Qianyu (2004): Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight). Palaeogeography, Palaeoclimatology, Palaeoecology, 208(1-2), 1-22, https://doi.org/10.1016/j.palaeo.2004.02.003
    Publication Date: 2024-01-09
    Description: The benthic stable isotope record from ODP Site 761 (Wombat Plateau, NW Australia, 2179.3 m water depth) documents complete recovery of the middle Miocene delta13C excursion corresponding to the climatic optimum and subsequent expansion of the East Antarctic Ice Sheet. The six main delta13C maxima of the „Monterey Excursion“ between 16.4 and 13.6 Ma and the characteristic stepped increase in delta18O between 14.5 and 13.9 Ma are clearly identified. The sedimentary record of the shallower ODP Sites 1126 and 1134 [Great Australian Bight (GAB), SWAustralia, 783.8 and 701 m water depth, respectively] is truncated by several unconformities. However, a composite benthic stable isotope curve for these sites provides a first middle Miocene bathyal record for southwest Australia. The delta18O and delta13C curves for Sites 1126 and 1134 indicate a cooler, better-ventilated water mass at ~700 m water depth in the Great Australian Bight since approximately 16 Ma. This cooler and younger water mass probably originated from a close southern source. Cooling of the bottom water at ~16 Ma started much earlier than at other sites of equivalent paleodepths in the central and western parts of the Indian Ocean. At Site 761, the delta18O curve shows an excellent match with the global sea level curve between ~11.5 and 15.1 Ma, and thus closely reflects changes in global ice volume. Prior to 15.1 Ma, the mismatch between the delta18O curve and the sea level curve indicates that delta18O fluctuations are mainly due to changes in bottom water temperature.
    Keywords: 122-761; 122-761B; 182-1126B; 182-1134A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Great Australian Bight; Joides Resolution; Leg122; Leg182; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 4 datasets
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