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Digitale Medien

Intrusion of basaltic sills into highly porous sediments, and resulting hydrothermal activity (1980)

Einsele, Gerhardt ; Gieskes, Joris M. ; Curray, Joseph ; [weitere]

[s.l.] : Nature Publishing Group

Nature 283 (1980), S. 441-445

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Sill intrusions into highly porous sediments in the Guaymas Basin, Gulf of California, lead to low-grade metamorphism, thermal alteration and migration of organic compounds, marked changes in interstitial water chemistry, and large-scale expulsion of heated pore fluids. The latter process creates ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/283441a0

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(Table 1) Sulfur isotopes and sulfur content at DSDP Leg 64 Holes

Shanks, Wayne C ; Niemitz, Jeffrey W

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In: Supplement to: Shanks, Wayne C; Niemitz, Jeffrey W (1982): Sulfur isotope studies of hydrothermal anhydrite and pyrite, Deep Sea Drilling Project Leg 64, Guaymas Basin, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 1137-1142, https://doi.org/10.2973/dsdp.proc.64.153.1982

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Publikationsdatum: 2023-06-27

Beschreibung: Hydrothermal pyrite samples from Holes 477, 477A, and 478 have sulfur isotope values ranging from about 10 to 11 per mil. Samples with negative sulfur isotope values generally have low sulfide sulfur contents and reflect mixed bacterial and hydrothermal sulfur sources. At higher sulfur contents, the hydrothermal component predominates, producing positive isotope values. Hydrothermal sulfide derives from reduction of seawater sulfate and may contain a significant basaltic component. Hydrothermal anhydrite is restricted to a narrow zone beneath a dolerite sill at Site 477 and, because of partial sulfate reduction in the circulating waters, has isotopic values (23.5-25 per mil), heavier than seawater.

Schlagwort(e): 64-477; 64-477A; 64-478; Comment; Deep Sea Drilling Project; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Gravimetric analysis; Iron monosulfide; Latitude of event; Leg64; Longitude of event; Mass spectrometer Varian MAT 250; North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL; Sample code/label; Sulfur of anhydrite; Sulfur of pyrite; δ34S, anhydrite; δ34S, pyrite

Materialart: Dataset

Format: text/tab-separated-values, 89 data points

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(Table 1) Chemical composition of bulk solids at DSDP Leg 64 Holes

Niemitz, Jeffrey W

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Publikationsdatum: 2023-06-27

Schlagwort(e): 64-474; 64-474A; 64-475; 64-476; 64-477; 64-477A; 64-478; 64-479; 64-481; 64-481A; Aluminium oxide; Calcium oxide; Carbon, organic, total; Chlorine; Chromium; Cobalt; Copper; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Element analyser CHN, LECO; Elevation of event; Event label; Glomar Challenger; Iron oxide, Fe2O3; Latitude of event; Leg64; Longitude of event; Loss on ignition; Magnesium oxide; Manganese oxide; Nickel; North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL; North Pacific/Gulf of California/SLOPE; North Pacific/Gulf of California/TERRACE; Phosphorus pentoxide; Potassium oxide; Sample code/label; see reference(s); Silicon dioxide; Sodium oxide; Sulfur, total; Titanium dioxide; Total; Vanadium; X-ray dispersive spectrometer (Kevex 7000-Micro-X); Zinc

Materialart: Dataset

Format: text/tab-separated-values, 1738 data points

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(Table 3) Elemental oxide ratios to AI2O3 of bulk solids at DSDP Leg 64 Holes

Niemitz, Jeffrey W

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Publikationsdatum: 2023-06-27

Schlagwort(e): 64-474; 64-474A; 64-475; 64-476; 64-477; 64-477A; 64-478; 64-479; 64-481; 64-481A; Calcium oxide/Aluminium oxide; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg64; North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL; North Pacific/Gulf of California/SLOPE; North Pacific/Gulf of California/TERRACE; Ratio; Sample code/label; Silicon dioxid/Aluminium oxid ratio

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Format: text/tab-separated-values, 702 data points

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Chemical composition and elemental oxide ratios to AI2O3 of bulk solids at DSDP Leg 64 Holes

Niemitz, Jeffrey W

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In: Supplement to: Niemitz, Jeffrey W (1982): Geochemistry of sediments, Leg 64, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 695-713, https://doi.org/10.2973/dsdp.proc.64.117.1982

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Publikationsdatum: 2023-06-27

Beschreibung: Analyses of sediments from Leg 64 sites reveal a diverse and in one case unique geochemistry. Sites are characterized by high heat flow along an active, divergent plate boundary, or rapid accumulation of diatom muds, or both. The geochemical trends of Sites 474-476 at the tip of Baja California reflect changes4n the percentages of sedimentary components - particularly biogenous matter and mineralogy - that support interpretations of sedimentary environments inferred to be present since the commencement of subsidence along this young, passive continental margin. The sediments below dolerite sills in Holes 477, 477A, 478, and 481 show major mineralogic and chemical deviations from "average" hemipelagic sediments. The sills appear to have two functions: (1) they allow hydrothermal circulation and metamorphism in a partially closed system by trapping heat and fluids emanating from below, and (2) they expel heated interstitial fluids at the moment of intrusion and mobilize elements, most likely leading to the formation of metalliferous deposits along the surface traces of normal faults in the basin. The hydrothermal system as a whole appears to be localized and ephemeral, as is indicated by the lack of similar geochemical trends and high heat flow at Sites 478 and 481. Site 479 illustrates sedimentation in an oxygen-minimum zone with anoxic sediments and concomitant geochemical trends, especially for MnO. With few exceptions, geochemical trends are remarkably constant with depth, suggesting that Site 479 can serve as an "internal" standard or average sediment against which the magnitude of hydrothermal alteration at the basinal Sites 477, 478, and 481 can be measured.

Schlagwort(e): 64-474; 64-474A; 64-475; 64-476; 64-477; 64-477A; 64-478; 64-479; 64-481; 64-481A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg64; North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL; North Pacific/Gulf of California/SLOPE; North Pacific/Gulf of California/TERRACE

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Format: application/zip, 2 datasets

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(Table 1) Minerals of bulk sediment at DSDP Holes 64-480 and 64-481

Kelts, Kerry ; Niemitz, Jeffrey W

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In: Supplement to: Kelts, Kerry; Niemitz, Jeffrey W (1982): Preliminary sedimentology of late Quaternary diatomaceous muds from Deep Sea Drilling Project Site 480, Guaymas Basin Slope, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 1191-1210, https://doi.org/10.2973/dsdp.proc.64.159.1982

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Publikationsdatum: 2023-06-27

Beschreibung: This paper provides a brief, descriptive, sedimentological background for the chapters on hydraulic piston core Site 480 in this symposium, and supplements data given in the site chapter for Sites 479-480 (this volume, Pt. 1). Sediments are composed primarily of planktonic diatoms, with minor numbers of silicoflagellates, radiolarians, and varying amounts of both benthic and planktonic foraminifers, along with a large terrigenous component of olive brown, silty clay. The section contains meter-thick intervals of finely laminated facies alternating with nonlaminated zones. A few paleoenvironmental events are documented within the generally uniform sequence by sporadic occurrences of thin turbidites, phosphatic concretions, fish debris concentrations, an ash layer, and a thin layer of diagenetic dolomite. The distribution of nonlaminated and laminated zones is attributed to fluctuations of bottom-water oxygen content caused by variations in circulation, fertility, and productivity. Homogeneous sections are interpreted as coinciding with cooler climatic periods, whereas laminated sections seem to correspond to upwelling conditions during drier periods.

Schlagwort(e): 64-480; 64-481; Calcite (peak height); Chlorite (peak height); Clay minerals; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Height; Illite (peak height); Kalifeldspar (peak height); Leg64; North Pacific/Gulf of California/BASIN; Plagioclase (peak height); Pyrite (peak height); Quartz (peak height); Sample code/label; Silica, amorphous; Smectite (peak height); X-ray diffraction (XRD)

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Format: text/tab-separated-values, 102 data points

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