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  • 1
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    Argon ratios, 40Ar/39Ar datings and biostratigraphic ages of ODP Leg 165 sites (2000)
    PANGAEA
    In:  Supplement to: Sigurdsson, Haraldur; Kelley, Simon P; Leckie, R Mark; Carey, Steven N; Bralower, Timothy J; King, John W (2000): History of circum-Caribbean explosive volcanism: 40Ar/39Ar dating of tephra layers. In: Leckie, RM; Sigurdsson, H; Acton, GD; Draper, G (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 165, 1-16, https://doi.org/10.2973/odp.proc.sr.165.021.2000
    Details
    Publication Date: 2024-01-09
    Description: Drilling in the Caribbean Sea during Ocean Drilling Program Leg 165 has recovered a large number of silicic tephra layers and led to the discovery of three major episodes of explosive volcanism that occurred during the last 55 m.y. on the margins of this evolving ocean basin. The earliest episode is marked by Paleocene to early Eocene explosive volcanism on the Cayman Rise, associated with activity of the Cayman arc, an island arc that was the westward extension of the Sierra Maestra volcanic arc in southern Cuba. Caribbean sediments also document a major mid- to late Eocene explosive volcanic episode that is attributed to ignimbrite-forming eruptions on the Chortis Block in Central America to the west. This event is contemporaneous with the first phase of activity of the Sierra Madre volcanic episode in Mexico, the largest ignimbrite province on Earth. In the Caribbean sediments, a Miocene episode of explosive volcanism is comparable to the Eocene event, and also attributed to sources in the Central American arc to the west. Radiometric 40Ar/39Ar dates have been obtained for biotites and sanidines from 27 tephra layers, providing absolute ages for the volcanic episodes and further constraining the geochronology of Caribbean sediments. Volcanic activity of the Cayman arc is attributed to the northward subduction of the leading edge of the oceanic plate that carried the Caribbean oceanic plateau. Although the factors generating the large episodes of Central American explosive volcanism are unclear, we propose that they are related to contemporary major readjustments of plate tectonic configuration in the Pacific.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 2
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    (Table DR1) Argon isotope data and dating for individual 〉63 µm amphibole grains from Labrador Sea sediments, ODP Hole 105-647A (2004)
    PANGAEA
    In:  Supplement to: Reynolds, Ben C; Sherlock, Sarah C; Kelley, Simon P; Burton, Kevin W (2004): Radiogenic isotope records of Quaternary glaciations: Changes in the erosional source and weathering processes. Geology, 32(10), 861-864, https://doi.org/10.1130/G20734.1
    Details
    Publication Date: 2024-01-09
    Description: Variations of global and regional silicate weathering rates and paleo-ocean circulation patterns are estimated by using radiogenic isotope records, but the effects of changes in provenance are generally ignored. Here sediment provenance has been constrained through the use of Ar-Ar ages for individual detrital minerals from the Labrador Sea, which can be compared directly to the radiogenic isotope compositions from the same core material. Dramatic changes in the radiogenic isotope composition of North Atlantic Deep Water through the Quaternary Period are shown to reflect discrete changes in both sources and weathering processes accompanying Northern Hemisphere glaciation. Changes in the different radiogenic isotope systems reflect the influence of source, physical weathering, and chemical weathering, and not simply changes in the underlying weathering rate or ocean circulation patterns that are typically inferred.
    Keywords: 105-647A; AGE; Age, dated; Age, dated standard deviation; Argon-36/Argon-39; Argon-36/Argon-39, standard deviation; Argon-37/Argon-39; Argon-37/Argon-39, standard deviation; Argon-38/Argon-39; Argon-38/Argon-39, standard deviation; Argon-39; Argon-40; Argon-40, standard deviation; Argon-40/Argon-39; Argon-40/Argon-39, standard deviation; Calculated; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Infrared laser ablation microprobe (IRLAMP); Joides Resolution; Leg105; Method comment; Number; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean; Standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 4595 data points
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  • 3
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    (Table 1) Argon ratios and datings of tephra layer biotites from ODP Leg 165 sites (2000)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 165-1000A; 165-1000B; 165-1001A; 165-1001B; 165-998A; 165-998B; 165-999A; 165-999B; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-36/Argon-39; Argon-37/Argon-39; Argon-38/Argon-39; Argon-39; Argon-40/Argon-39; Caribbean Sea; Colombia Basin, Caribbean Sea; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Factor; Joides Resolution; Latitude of event; Leg165; Longitude of event; Mass spectrometer, noble gas, MAP215-50; Number; Ocean Drilling Program; ODP; Ratio; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 2154 data points
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  • 4
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    (Table 3) Argon ratios and datings of tephra layer feldspars from ODP Hole 165-999A (2000)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 165-999A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-36/Argon-39; Argon-37/Argon-39; Argon-38/Argon-39; Argon-39; Argon-40/Argon-39; Caribbean Sea; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Factor; Joides Resolution; Leg165; Mass spectrometer, noble gas, MAP215-50; Number; Ocean Drilling Program; ODP; Ratio; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 208 data points
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  • 5
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    (Table 2) Comparison of radiometric 40Ar/39Ar datings of tephra layers and biostratigraphic ages from ODP Leg 165 sites (2000)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 165-1000A; 165-1000B; 165-1001A; 165-1001B; 165-998A; 165-999A; 165-999B; Age, 40Ar/39Ar Argon-Argon; Age, biostratigraphy; Age, comment; Age, dated; Age, dated, range, maximum; Age, dated, range, minimum; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Age model; Age model, biostratigraphy; Ageprofile Datum Type; Caribbean Sea; Colombia Basin, Caribbean Sea; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Grains, counted/analyzed; Joides Resolution; Latitude of event; Leg165; Longitude of event; Ocean Drilling Program; ODP; Sample code/label; Sample comment; Tephra/volcanic ash
    Type: Dataset
    Format: text/tab-separated-values, 857 data points
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  • 6
    Electronic Resource
    Electronic Resource
    Constant elevation of southern Tibet over the past 15 million years (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 421 (2003), S. 622-624 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The uplift of the Tibetan plateau, an area that is 2,000 km wide, to an altitude of about 5,000 m has been shown to modify global climate and to influence monsoon intensity. Mechanical and thermal models for homogeneous thickening of the lithosphere make specific predictions about ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01356
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Evidence for a late Triassic multiple impact event on Earth (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 171-173 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Evidence for the collision of fragmented comets or asteroids with some of the larger (jovian) planets and their moons is now well established following the dramatic impact of the disrupted comet Shoemaker–Levy 9 with Jupiter in 1994 (ref. 1). Collisions by fragmented objects ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/32397
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  • 8
    Electronic Resource
    Electronic Resource
    A microstructural and argon laserprobe study of shear zone development at the western margin of the Nanga Parbat–Haramosh Massif, western Himalaya (1997)
    Springer
    Contributions to mineralogy and petrology 128 (1997), S. 16-29 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A sample of banded amphibolite from the western margin of the Nanga Parbat–Haramosh Massif as Sassi has been studied using microstructural and 40Ar/39Ar laserprobe techniques to investigate the relationship between deformation and argon isotope variations in a natural system. Amphibolite-grade deformation occurred during south-directed overthrusting of the Kohistan arc over India along the Main Mantle Thrust and was overprinted by extensional reactivation of the earlier fabric and the formation of biotite-rich shear zones. Subsequent deformation along discrete fine-grained fault zones was characterised by the formation of scapolite, chlorite and K-feldspar, early plastic deformation and later cataclasis. Different minerals developed during this history show a wide range in apparent 40Ar/39Ar ages. Biotite, chlorite and scapolite exhibit much lower concentrations of excess argon, indicating their equilibration in a fluid relatively poor in excess argon. A `true' age of ca. 8 Ma from biotite represents a minimum age for deformation associated with formation of the Nanga Parbat Syntaxis and also precludes Pliocene metamorphism in this area of the syntaxis. Both high- and low-closure temperature minerals (amphiboles and feldspars) record apparent ages which are associated with the incorporation of excess argon within the mineral lattice. Although differential thermal resetting of minerals at different closure temperatures is important, variations in the inherited 40Ar/36Ar ratio throughout the sample is dominated by deformation and fluid infiltration. Consequently it appears that within deforming metamorphic rocks, areas with significantly different argon isotope compositions may be present and need not be homogenised by diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050290
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  • 9
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    40Ar/39Ar ages in mantle xenolith phlogopites: determining the ages of multiple lithospheric mantle events and diatreme ascent rates in southern Africa and Malaita, Solomon Islands (2003)
    In:  Geological Society Special Publication 220: 231-248.
    Details
    Publication Date: 2003-01-01
    Description: Kimberlites are extraordinary natural phenomena, ascending through the Earth's lithosphere, entraining xenoliths, to erupt at the surface within hours to days of their inception deep within the lithospheric mantle. With the realization that some Ar/Ar phlogopite grain core ages may be indicative of geological events, we have undertaken high spatial resolution Ar/Ar dating of phlogopites in xenoliths and megacrysts from Kimberley, Monastery and Letseng in southern Africa, and Malaita, in the Solomon Islands, to est whether other mantle phlogopite cores may yield meaningful ages. Modelling of Ar diffusive loss profiles from phlogopite grain boundaries to cores provides information on both the eruption age and the duration of outgassing within the kimberlite magma, and hence yields estimates on diatreme ascent rates. The ascent durations are very similar for all of the southern African pipes studied, yielding durations of 0.9-6.9 days, assuming an average kimberlite magma temperature of 1000 {degrees}C. These can be compared to estimates from phlogopite xenoliths from Siberian diamond-bearing kimberlites yielding ascent durations of 2-15 hours (assuming the same magma temperature).
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  • 10
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    Interpreting and reporting 40Ar/39Ar geochronologic data (2020)
    Geological Society of America
    Details
    Publication Date: 2020-07-01
    Description: The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a single sample. Moreover, inferring a geologically meaningful “age” from a measured “date” or set of dates is dependent on the geological problem being addressed and the salient assumptions associated with each set of data. We highlight requirements for collateral information that will better constrain the interpretation of 40Ar/39Ar data sets, including those associated with single-crystal fusion analyses, incremental heating experiments, and in situ analyses of microsampled domains. To ensure the utility and viability of published results, we emphasize previous recommendations for reporting 40Ar/39Ar data and the related essential metadata, with the amendment that data conform to evolving standards of being findable, accessible, interoperable, and reusable (FAIR) by both humans and computers. Our examples provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America
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