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  • PANGAEA  (36)
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  • 1
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    Geochemistry and ages at DSDP Holes 81-552A, 81-553A and 81-555
    PANGAEA
    In:  Supplement to: Morton, Andrew C; Merriman, Richard J; Mitchell, John G (1984): Genesis and significance of glauconitic sediments of the southwest Rockall Plateau. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 645-652, https://doi.org/10.2973/dsdp.proc.81.120.1984
    Details
    Publication Date: 2023-05-12
    Description: Glauconite-rich sediments have been encountered at two horizons during drilling in the southwest Rockall Plateau. The younger of these horizons lies at the base of a deep-sea ooze sequence and is of early or middle Miocene age. Glauconite formed in situ during periods of nondeposition related to strong bottom-water currents, in water depths of as much as 2500 m - five times greater than previously accepted limits for glauconite formation. The older horizon, of early Eocene age, is a record of the major transgression coincident with the separation of Rockall and Greenland. Isotopic age dating of the Miocene glauconites gives results in relatively close accord with their biostratigraphic age. However, an Eocene (NP12) glauconite gives a highly discrepant date (36.5 m.y. ago). One possible explanation is that the Eocene glauconites have continued to evolve after burial by the diagenetic uptake of potassium from the surrounding mud matrix, a possibility denied to the Miocene glauconites by the relative scarcity of available potassium in the nannofossil-foraminiferal ooze matrix.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Minerals and geochemistry of DSDP Hole 81-552A
    PANGAEA
    In:  Supplement to: Morton, Andrew C (1984): Coarse fraction of Plio-Pleistocene sediments from Deep Sea Drilling Project Hole 552A, Northeast Atlantic. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 663-667, https://doi.org/10.2973/dsdp.proc.81.122.1984
    Details
    Publication Date: 2023-05-12
    Description: The acid insoluble coarse fractions of the glacial-interglacial sequence of Hole 552A in the NE Atlantic are made up of varying amounts of terrigenous detritus, biogenic silica, and pyroclastic material, principally volcanic glass. Volcanic ash content varies significantly over the entire interval, and the three North Atlantic ash horizons of Ruddiman and Glover (1972) can be recognized satisfactorily. The terrigenous detritus is of mixed metamorphic-basaltic type and probably originated on the Greenland landmass
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 3
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    Geochemistry and minerals at DSDP Leg 81 Holes
    PANGAEA
    In:  Supplement to: Morton, Andrew C; Keene, John B (1984): Paleogene pyroclastic volcanism in the southwest Rockall Plateau. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 633-643, https://doi.org/10.2973/dsdp.proc.81.119.1984
    Details
    Publication Date: 2023-05-12
    Description: Three phases of volcanism have been recognized in the lower Paleogene sequence of the southwest Rockall Plateau which are related to the onset of seafloor spreading in the NE Atlantic. The earliest, Phase 1, is marked by a sequence of tholeiitic basalts and hyaloclastites which form the dipping reflector sequence in Edoras Basin. Phase 2 is characterized by tuffs and lapilli tuffs of air-fall origin, ranging in composition from basic to intermediate. They were generated by highly explosive igneous activity due to magma-water interaction, and terminate at the level of a major transgression. Subsequently, volcanism reverted to tholeiitic basalt type, producing the thin tuffs and minor basalt flows of Phase 3. Alteration of the volcanic glass and diagenesis of the tuffs and lapilli tuffs has been considerable in many cases, with a large number of diagenetic mineral phases observed, including smectite, celadonite, analcime, phillipsite, clinoptilolite, mordenite, and calcite. Although calcite is the latest observed diagenetic cement, it nevertheless occurred relatively early, in one case totally preserving basaltic glass from alteration.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
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    Heavy minerals from Paleogene sediments at DSDP Leg 81 Holes
    PANGAEA
    In:  Supplement to: Morton, Andrew C (1984): Heavy minerals from Paleogene sediments, Deep Sea Drilling Project Leg 81: Their bearing on stratigraphy, sediment provenance, and the evolution of the North Atlantic. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 653-661
    Details
    Publication Date: 2023-05-12
    Description: Five heavy mineral associations occur in the Paleocene and Eocene sediments recovered during Leg 81 of the Deep Sea Drilling Project (DSDP) in the SW Rockall area. Association 1, consisting of augite, iddingsite, and olivine, was derived from the basaltic rocks of the northern part of the Rockall Plateau. Association 2 consists of epidote group minerals, including piedmontite, and amphiboles of actinolite, actinolitic hornblende, and magnesio-hornblende compositions, and was derived from the metamorphic basement of south Greenland. Association 3 comprises garnet, augite, apatite, and edenitic and pargasitic amphiboles and has a provenance in the southern Rockall Plateau. Associations 4 (garnet, apatite, edenitic/pargasitic amphiboles) and 5 (garnet, apatite) are intrastratal solution derivatives of Association 3, with successive removal of first pyroxene and then amphibole with increasing depth of burial. Throughout the SW Rockall Plateau area there is a significant change in the spectrum of the above assemblages in the lower part of the Eocene. This change has been noted at Sites 403, 404, 553, and 555 and is defined by the last appearance of Association 2. This level therefore marks the cessation of sediment supply from southern Greenland and is the result of the final separation of Rockall and Greenland immediately prior to magnetic Anomaly 24.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 5
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    U-Pb ages of rutile detritus from the river Tarn, Massif Central, France (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Age, error; Age, mineral; Correlation coefficient, isotope ratio error; Event label; GOS11/14-02; GOS11/14-04; Latitude of event; Lead-206/Uranium-238, error; Lead-206/Uranium-238 ratio; Lead-207/Lead-206, error; Lead-207/Lead-206 ratio; Lead-207/Uranium-235, error; Lead-207/Uranium-235 ratio; Method comment; Proportion; RIVER; Sample code/label; Sampling river; Uranium-238; Uranium-238/Lead-206, error; Uranium-238/Lead-206 ratio
    Type: Dataset
    Format: text/tab-separated-values, 2408 data points
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  • 6
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    U-Pb ages of apatite detritus from the river Tarn, Massif Central, France (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Age, error; Age, mineral; Correlation coefficient, isotope ratio error; Event label; GOS11/14-01; GOS11/14-02; GOS11/14-04; GOS11/14-06; GOS11/14-07; GOS11/14-08; GOS11/14-09; GOS11/14-10; GOS11/14-11; GOS11/14-13; Latitude of event; Lead-206/Uranium-238, error; Lead-206/Uranium-238 ratio; Lead-207/Lead-206, error; Lead-207/Lead-206 ratio; Lead-207/Uranium-235, error; Lead-207/Uranium-235 ratio; Longitude of event; Method comment; Proportion; RIVER; Sample code/label; Sampling river; Uranium-238; Uranium-238/Lead-206, error; Uranium-238/Lead-206 ratio
    Type: Dataset
    Format: text/tab-separated-values, 13863 data points
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  • 7
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    Trace element composition of apatite detritus from the river Tarn, Massif Central, France (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Arsenic-75; Arsenic-75, error; Cerium-140; Cerium-140, error; Dysprosium-163; Dysprosium-163, error; Erbium-166; Erbium-166, error; Europium-153; Europium-153, error; Event label; Gadolinium-157; Gadolinium-157, error; GOS11/14-01; GOS11/14-02; GOS11/14-04; GOS11/14-06; GOS11/14-07; GOS11/14-08; GOS11/14-09; GOS11/14-10; GOS11/14-11; GOS11/14-13; Holmium-165; Holmium-165, error; Lanthanum-139; Lanthanum-139, error; Latitude of event; Longitude of event; Lutetium-175; Lutetium-175, error; Magnesium-24; Magnesium-24, error; Manganese-55; Manganese-55, error; Neodymium-146; Neodymium-146, error; Praseodymium-141; Praseodymium-141, error; RIVER; Samarium-147; Samarium-147, error; Sample code/label; Sampling river; Strontium-86; Strontium-86, error; Terbium-159; Terbium-159, error; Thorium-232; Thorium-232, error; Thulium-169; Thulium-169, error; Tungsten-182; Tungsten-182, error; Uranium-238; Uranium-238, error; Vanadium-11; Vanadium-11, error; Ytterbium-172; Ytterbium-172, error; Yttrium-89; Yttrium-89, error; Zirconium-90; Zirconium-90, error
    Type: Dataset
    Format: text/tab-separated-values, 45727 data points
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  • 8
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    U-Pb ages and trace element composition of apatite and rutile detritus from the river Tarn, Massif Central, France (2017)
    PANGAEA
    In:  Supplement to: O'Sullivan, Gary J; Chew, David M; Morton, Andrew C; Mark, Chris; Henrichs, Isadora A (2018): An Integrated Apatite Geochronology and Geochemistry Tool for Sedimentary Provenance Analysis. Geochemistry, Geophysics, Geosystems, 19(4), 1309-1326, https://doi.org/10.1002/2017GC007343
    Details
    Publication Date: 2023-01-13
    Description: U-Pb ages and trace element composition of apatite and rutile detritus from the river Tarn, Massif Central, France.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 9
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    (Table 3) Heavy minerals at DSDP Hole 81-555
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 81-555; Allanite; Anatase; Andalusite; Apatite; Augite; Clinozoisite; Counting 63-125 µm fraction; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epidote; Garnet; Glomar Challenger; Grains, counted/analyzed; Hornblende; Hypersthene; Iddingsite; Leg81; North Atlantic/PLATEAU; Olivine; Piemontite; Rutile; Sample code/label; Sphene; Tourmaline; Tremolite; Zircon
    Type: Dataset
    Format: text/tab-separated-values, 588 data points
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    DATA PANGAEA
  • 10
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    (Table 1) Heavy minerals at DSDP Site 81-552
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 81-552; 81-552A; Anatase; Andalusite; Apatite; Augite; Counting 63-125 µm fraction; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Epidote; Event label; Garnet; Glomar Challenger; Grains, counted/analyzed; Hornblende; Hypersthene; Iddingsite; Leg81; North Atlantic/PLATEAU; Olivine; Rutile; Sample code/label; Sphene; Tourmaline; Tremolite; Zircon
    Type: Dataset
    Format: text/tab-separated-values, 105 data points
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