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  • PANGAEA  (5)
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  • 1
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    (Table 1) Geochemistry of Cocos Plate hemipelagic-pelagic sediments in DSDP Hole 66-487
    PANGAEA
    In:  Supplement to: Leggett, Jeremy K (1982): Geochemistry of Cocos Plate pelagic-hemipelagic sediments in Hole 487, Deep Sea Drilling Project Leg 66. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 683-686, https://doi.org/10.2973/dsdp.proc.66.130.1982
    Details
    Publication Date: 2023-06-27
    Description: The sedimentary sequence recovered from Hole 487 documents northeast seafloor spreading on the Cocos Plate. A basal 65-meter unit of upper Miocene-Pliocene brown clay was deposited on the subsiding east flank of the East Pacific Rise. The overlying 105-meter unit of gray hemipelagic silt and mud was deposited when Site 487 drifted within reach of terrigenous sediment derived from the Mexican continental margin. Analyses of 21 elements in 45 samples, taken at regular intervals up Hole 487, give a geochemical profile which shows metal enrichment in basal sediment similar to that observed in previously recovered basal sediment sections in the Eastern Pacific (e.g., von der Borch & Rex, 1970; von der Borch et al., 1971). This verifies that the basalt cored at the base the hole is oceanic basement, since the first sediment to be deposited on newly formed ocean crust is characteristically enriched in metals, particularly Fe and Mn. The metals precipitate from circulating hydrothermal-exhalative solutions which are an integral part of active ridge volcanism (summary in Jenkyns, 1978). In this chapter I discuss the geochemistry of the basal metalliferous sediment from Hole 487. The geochemical data may also prove useful in studies of onshore volcanism: mass-balance calculations show that much (possibly all) of the incoming Cocos Plate sediment has been subducted since the Miocene (Watkins et al., this volume). It may have contributed to the genesis of magmas erupted in the Mexican volcanic arc
    Keywords: 66-487; Aluminium; Barium; Calcium; Chromium; Cobalt; Copper; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Iron; Lanthanum; Lead; Leg66; Lithium; Magnesium; Manganese; Molybdenum; Nickel; North Pacific/TRENCH; Phosphorus; Potassium; Sample code/label; Sample ID; Sodium; Strontium; Titanium; Vanadium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 1024 data points
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  • 2
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    (Table 2) Total grain-size fraction and heavy mineral separate weights at DSDP Leg 66 sands
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 66-486; 66-486A; 66-488; 66-489A; 66-490; 66-491; 66-492; 66-492B; 66-493; Clay, mass netto; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Heavy minerals; Latitude of event; Leg66; Longitude of event; Mass; North Pacific; North Pacific/CREST; North Pacific/SLOPE; North Pacific/TRANSITION ZONE; North Pacific/TRENCH; Sample code/label; Sand, mass netto; see reference(s)
    Type: Dataset
    Format: text/tab-separated-values, 293 data points
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  • 3
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    (Table 1) Modal of detrital components at DSDP Leg 66 sands
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 66-486; 66-486A; 66-488; 66-489A; 66-490; 66-491; 66-492; 66-492B; 66-493; Carbonates; Chert; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elevation of event; Event label; Glauconite; Glomar Challenger; Kalifeldspar; Latitude of event; Leg66; Lithic grains; Longitude of event; Mafic minerals; North Pacific; North Pacific/CREST; North Pacific/SLOPE; North Pacific/TRANSITION ZONE; North Pacific/TRENCH; Plagioclase; Quartz, monocrystalline; Quartz, polycrystalline; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 528 data points
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  • 4
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    (Table 3) Abundance of heavy mineral species and groups in DSDP Leg 66 sand/sandstone samples
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 66-486; 66-486A; 66-488; 66-489; 66-490; 66-491; 66-492; 66-492B; 66-493; Allanite; Aluminosilicates; Apatite; Biotite; Counting 125-210 µm fraction; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Epidote; Epoch; Event label; Garnet; Glomar Challenger; Grains, counted/analyzed; Heavy minerals; Hornblende; Ilmenite; Iron oxide; Latitude of event; Leg66; Longitude of event; Mica; North Pacific; North Pacific/CREST; North Pacific/SLOPE; North Pacific/TRANSITION ZONE; North Pacific/TRENCH; Opaque minerals; Orthopyroxene; Pyrite, FeS2; Sample code/label; Sphene; Titanium dioxide; Tremolite/Actinolite; Zircon
    Type: Dataset
    Format: text/tab-separated-values, 396 data points
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  • 5
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    Petrology at DSDP Leg 66 Holes
    PANGAEA
    In:  Supplement to: Bachman, Steven B; Leggett, Jeremy K (1982): Petrology of Middle America Trench and trench slope sands, Guerrero Margin, Mexico. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 429-436, https://doi.org/10.2973/dsdp.proc.66.111.1982
    Details
    Publication Date: 2023-06-27
    Description: The sandstone petrology of Leg 66 samples provides insights into changes through time in the geology of the source regions along the Guerrero portion of the Middle America continental margin. This in turn constrains possible models of the evolution of the Middle America Trench (e.g., de Czerna, 1971; Malfait and Dinkleman, 1972; Karig, 1974). Primarily medium-grained sands and sandstones, representing the widest variety available of trench/trench slope settings and ages, were analyzed in both light and heavy mineral studies. Standard techniques were used as much as possible in order to compare results from other margins and from ancient rocks.
    Keywords: 66-486; 66-486A; 66-488; 66-489; 66-489A; 66-490; 66-491; 66-492; 66-492B; 66-493; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg66; North Pacific; North Pacific/CREST; North Pacific/SLOPE; North Pacific/TRANSITION ZONE; North Pacific/TRENCH
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
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