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  • 1
    Call number: S 90.0006(212)
    In: Memoir
    Description / Table of Contents: "This memoir brings together results from a multidisciplinary study of the processes that have formed the highest, widest part of the Andean Cordilleran orogenic belt in northern Argentina and Chile. The region features a tectonically erosive forearc, protracted arc magmatism, a high-elevation hinterland plateau and strongly shortened retroarc thrust belt, and a Paleocene-Recent foreland basin system"--
    Type of Medium: Series available for loan
    Pages: V, 490 S. , Ill., graph. Darst. , 29 cm
    ISBN: 9780813712123
    Series Statement: Memoir / Geological Society of America 212
    Classification:
    Geodynamics
    Language: English
    Note: Geodynamic models of Cordilleran orogens : gravitational instability of magmatic arc roots / Heather M. McPherson, Jonathan R. Pratt, Sharon Bywater-Reyes, and Estelle MortimerImaging the Nazca slab and surrounding mantle to 700 km depths beneath the central Andes (18°S to 28°S) / Alissa Scire, C. Berki Biryol, George Zandt, and Susan Beck -- Multiple styles and scales of lithospheric foundering beneath the Puna Plateau, central Andes / Susan L. Beck, George Zandt, Kevin M. Ward, and Alissa Scire -- Along-strike variation in crustal seismicity and modern lithospheric structure of the central Andes forearc / Kathryn Metcalf and Paul Kapp -- Along-strike variation in structural styles and hydrocarbon occurrences, Subandean fold-and-thrust belt and inner foreland, Colombia to Argentina / Michael F. McGroder, Richard O. Lease, and David M. Pearson -- U-Pb zircon geochronology of Neoproterozoic-Paleozoic sandstones and Paleozoic plutonic rocks in the central Andes (21°S-26°S) / Jesse C. Einhorn, George E. Gehrels, Antoine Vernon, and Peter G. DeCelles -- The origin and petrologic evolution of the Ordovician Famatinian-Puna arc / M.N. Ducea, J.E. Otamendi, G.W. Bergantz, D. Jianu, and L. Petrescu -- Foundering-driven lithospheric melting : the source of central Andean mafic lavas on the Puna Plateau (22°S-27°S) / Kendra E. Murray, Mihai N. Ducea, and Lindsay Schoenbohm -- Miocene-Pliocene shortening, extension, and mafic magmatism support small-scale lithospheric foundering in the central Andes, NW Argentina / Lindsay M. Schoenbohm and Barbara Carrapa -- Exhumation of the Precordillera and northern Sierras Pampeanas and along-strike correlation of the Andean orogenic front, northwestern Argentina / Roxana Safipour, Barbara Carrapa, Peter G. DeCelles, and Stuart N. Thomson -- Regional exhumation and kinematic history of the central Andes in response to cyclical orogenic processes / Barbara Carrapa and Peter G. Decelles -- Low-temperature thermochronologic trends across the central Andes, 21°S-28°S / P.W. Reiners, S.N. Thomson, A. Vernon, S.D. Willett, M. Zattin, J. Einhorn, G. Gehrels, J. Quade, D. Pearson, K.E. Murray, and W. Cavazza -- Climate and tectonics along the southern margin of the Puna Plateau, NW Argentina : origin of the late cenozoic Punaschotter conglomerates / Lindsay M. Schoenbohm, Barbara Carrapa, Heather M. McPherson, Jonathan R. Pratt, Sharon Bywater-Reyes, and Estelle Mortimer -- Testing the analytical protocols and calibration of volcanic glass for the reconstruction of hydrogen isotopes in paleoprecipitation / Matthew P. Dettinger and Jay Quade -- The growth of the central Andes, 22°S-26°S / J. Quade, M.P. Dettinger, B. Carrapa, P. DeCelles, K.E. Murray, K.W. Huntington, A. Cartwright. R.R. Canavan, G. Gehrels, and M. Clementz -- Lake formation, characteristics, and evolution in retroarc deposystems : a synthesis of the modern Andean orogen and its associated basins / Andrew Cohen, Michael M. McGlue, Geoffrey S. Ellis, Hiran Zani, Peter W. Swarzenski, Mario L. Assine, and Aguinaldo Silva -- Simulating foreland basin response to mountain belt kinematics and climate change in the Eastern Cordillera and Subandes : an analysis of the Chaco foreland basin in southern Bolivia / Todd M. Engelder and Jon D. Pelletier -- The Miocene Arizaro Basin, central Andean hinterland : response to partial lithosphere removal? / P.G. DeCelles, B. Carrapa, B.K. Horton, J. McNabb, G.E. Gehrels, and J. Boyd -- Hinterland basin formation and gravitational instabilities in the central Andes : constraints from gravity data and geodynamic models / Huilin Wang, Claire A. Currie, and Peter G. DeCelles -- Temporal growth of the Puna Plateau and its bearing on the post-Salta Rift system subsidence of the Andean foreland basin at 25°30°S / Thomas P. Becker, G. Gray, and D. Awwiller -- Cyclical orogenic processes in the Cenozoic central Andes / P.G. DeCelles, G. Zandt, S.L. Beck, C.A. Currie, M.N. Ducea, P. Knapp, G.E. Gehrels, B. Carrapa, J. Quade, and L.M. Schoenbohm..
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2019-04-29
    Description: Near-modern ecosystems were established as a result of rapid ecological adaptation and climate change in the Late Miocene. On land, Late Miocene aridification spread in tandem with expansion of open habitats including C4 grassland ecosystems. Proxy records for the central Andes spanning the Late Miocene cooling (LMC) show the reorganization of subtropical ecosystems and hydroclimate in South America between 15 and 35°S. Continental pedogenic carbonates preserved in Neogene basins record a general increase of δ18O and δ13C values from pre-LMC to post-LMC, most robustly occurring in the subtropics (25 to 30°S), suggesting aridification and a shift toward a more C4-plant-dominated ecosystem. These changes are closely tied to the enhancement of the Hadley circulation and moisture divergence away from the subtropics toward the Intertropical Convergence Zone as revealed by climate model simulations with prescribed sea-surface temperatures (SSTs) reflecting different magnitudes of LMC steepening of equator-to-pole temperature gradient and CO2 decline.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 3
    Publication Date: 2016-07-01
    Description: The Alps are the archetypical collisional orogenic system on Earth and yet our understanding of processes controlling topographic growth in the Cenozoic remains incomplete. Whereas ideas and models on the Alps are abundant, data from the foreland basin record able to constrain the timing of erosion and sedimentation, mechanisms of basin accommodation and basin deformation are sparse. We combine seismic stratigraphy, micropaleontology, white mica 40 Ar/ 39 Ar, detrital zircon (U-Th)/He and apatite fission track thermochronology to Miocene-Pliocene samples from the retro-wedge foreland basin (Saluzzo Basin in Italy) and to Oligocene-Miocene sedimentary rocks from the pro-wedge foreland basin (Bârreme Basin in France) of the Western Alps. Our new data show that exhumation in the Oligocene-Miocene was non uniform across the Western Alps. Topographic growth was underway since the Oligocene and exhumation was concentrated on the pro-side of the orogenic system. Rapid and episodic early Miocene exhumation of the Western Alps was concentrated instead on the retro-side of the orogen and correlates with a major unconformity in the proximal retro-foreland basin. A phase of orogenic construction is recorded by exhumation of the proximal pro-foreland in both the Central and Western Alps at ca. 16 Ma. This is associated with high sedimentation rates, and by inference erosion rates, and suggests that an increase in accretionary flux associated with the dynamics of subduction of Europe under Adria controlled orogenic expansion in the Miocene.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
    Publication Date: 2011-06-01
    Description: Marginal-marine deposits are typically excellent hydrocarbon reservoirs around the world. Certain depositional environments may provide natural, selective, physical processes that produce better reservoir rocks than others depending on associated energy, hydraulic regime, etc. With this paper we present new detailed sedimentological, petrographic, and grain-size data of ancient flood-tidal-delta deposits that provide means to characterize this environment in the ancient as well as to determine reservoir characteristics. In this study, we compare grain size, grain and cement composition, and the ratio of pore space to cement from thin sections between tidal, shoreface, and flood-tidal-delta facies of the Sego Sandstone in northwest Colorado. The intent of this comparison is to provide an evaluation of different physical processes and the degree of diagenesis related to different environments to better understand the relative controls on reservoir characteristics. We find that flood-tidal-deltas show a statistically larger average grain size than either shoreface or other tidal facies. Also, flood-tidal-deltas have a smaller ratio of pore-space to cement. Shoreface facies have a larger ratio of pore space to cement overall than that of flood-tidal-delta or other tidal facies. We propose that this may be due to chemistry and higher weathering rates in the backbay environment in contrast to the shoreface environment, where higher mechanical reworking may lead to selective removal of chemically unstable minerals. To test this hypothesis, we conducted statistical analyses of these petrophysical and grain size characteristics. Our results show that flood-tidal-deltas are characterized by clean upper-fine-grained cross-bedded sandstone that is well sorted and subrounded to rounded with a majority of landward paleocurrent directions and a presence of tidal bundles, mud drapes, and reactivation surfaces.
    Print ISSN: 1527-1404
    Topics: Geosciences
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  • 5
    Publication Date: 2012-02-01
    Description: The timing of Tibetan plateau development remains elusive, despite its importance for evaluating models of continental lithosphere deformation and associated changes in surface elevation and climate. We present new thermochronologic data [biotite and K-feldspar 40Ar/39Ar, apatite fission track, and apatite (U-Th)/He] from the central Tibetan plateau (Lhasa and Qiangtang terranes). The data indicate that over large regions, rocks underwent rapid to moderate cooling and exhumation during Cretaceous to Eocene time. This was coeval with 〉50% upper crustal shortening, suggesting substantial crustal thickening and surface elevation gain. Thermal modeling of combined thermochronometers requires exhumation of most samples to depths of
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 6
    Publication Date: 2012-02-01
    Description: We dated 86 borehole and surface samples from basement-cored Laramide uplifts of the northern Rocky Mountain foreland (Wind River, Beartooth, Bighorn and Laramie Ranges) using the apatite (U-Th)/He system, and eleven samples using the apatite fission-track system (Wind River and Bighorn Ranges). Apatite (U-Th)/He ages generally decrease with increasing subsurface depth (decreasing elevation), and typically range from ∼100 to 50 Ma (Cretaceous to Eocene) within ∼1 km of the surface, to ∼20 Ma (Miocene) and younger ages at depths greater than ∼2 to 2.5 km. Most samples display (U-Th)/He age dispersion ranging from tens to hundreds of Ma, and for some samples we find ages that are older than corresponding fission-track ages. At least one sample per range shows a correlation between apatite (U-Th)/He age and effective U concentration (eU = [U] + 0.235[Th]) of the crystal, indicating that radiation damage has affected He diffusivity, and hence (U-Th)/He age.Forward modeling of simple Laramide-type thermal histories using a radiation damage diffusion model predicts: 1) fossil apatite fission-track partial annealing and apatite (U-Th)/He partial retention zones over similar elevation ranges, 2) (U-Th)/He age dispersion within a fossil partial retention zone up to hundreds of Ma, and 3) (U-Th)/He ages older than fission-track ages within a fossil partial retention zone if eU ≳ 20 ppm. We observe these features in our data from the Bighorn and Laramie Ranges. Most of our samples, however, do not show the correlation between (U-Th)/He age and eU predicted by radiation damage diffusion models. The age dispersion of these samples could be due to the influence of both grain size and eU content, or alternatively due to high U or Th secondary rims around the apatite crystals. (U-Th)/He ages that are older than fission-track ages from Gannett Peak and Fremont Peak in the Wind River Range, and some samples from the Beartooth Range, are most likely the result of He implantation from high eU secondary rims.Best-fit time-temperature paths from inverse modeling of (U-Th)/He age-eU pairs, when extrapolated to other elevations to create model age-elevation plots, reproduce the general distribution and dispersion of (U-Th)/He ages from the Bighorn, Beartooth and Wind River Ranges and suggest that rapid exhumation within the Laramide province likely began earlier in the Bighorn Range (before ∼71 Ma) than the Beartooth Range (before ∼58 Ma). Inverse modeling of borehole data at the northern end of the Laramie Range suggests that the well penetrated a fault sliver at depth. The amount and timing of post-Laramide burial and exhumation cannot be determined from these data.
    Print ISSN: 0002-9599
    Electronic ISSN: 1945-452X
    Topics: Geosciences
    Published by HighWire Press on behalf of The American Journal of Science.
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  • 7
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  • 9
    Publication Date: 2020-04-29
    Description: Interactions between midlatitude westerlies and the Pamir–Tian Shan mountains significantly impact hydroclimate patterns in Central Asia today, and they played an important role in driving Asian aridification during the Cenozoic. We show that distinct west-east hydroclimate differences were established over Central Asia during the late Oligocene (ca. 25 Ma), as recorded by stable oxygen isotopic values of soil carbonates. Our climate simulations show that these differences are present when relief of the Pamir–Tian Shan is higher than 75% of modern elevation (∼3000 m). Integrated with geological evidence, we suggest that a significant portion of the Pamir–Tian Shan orogen had reached elevations of ∼3 km and acted as a moisture barrier for the westerlies since ca. 25 Ma.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 10
    Publication Date: 2018-06-07
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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