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

Einsele, Gerhardt; Gieskes, Joris M.; Curray, Joseph R.; Moore, David; Aguayo, Eduardo; Aubry, Marie‐Pierre; Fornari, Daniel J.; Guerrero, J.; Kastner, Miriam; Kelts, Kerry; Lyle, Mitchell W; Matoba, Yasumochi; Molina-Cruz, Adolfo; Niemitz, J.; Rueda, J.L.; Saunders, Andrew D.; Schrader, Hans; Simoneit, Bernd R.T.; Vacquier, Victor D.

doi:10.1038/283441a0

Cited by 270 publications

(163 citation statements)

References 14 publications

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“…The basin has a rather high rate of sediment accumulation (2.7 m/10 3 yr) associated with high biological productivity and, as a consequence, a rapid burial of unoxidized organic matter. The region offers an opportunity to investigate the effect of increased temperatures on diagenetically unaltered organic matter (Einsele et al, 1980). Hole 477 is in the southern rift zone.…”

Section: Guaymas Basinmentioning

confidence: 99%

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Галимов¹,

Simoneit²

1982

Initial Reports of the Deep Sea Drilling Project

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We analyzed interstitial gases from holes at Sites 474, 477, 478, 479, and 481 in the Gulf of California, using gas chromatography and stable isotope mass spectrometry to evaluate their composition in terms of biogenic and thermogenic sources. The hydrocarbon gas (C1-C5) concentrations were comparable to the shipboard data, and no olefins could be detected. The δ 13 C data for the CH 4 confirmed the effects of thermal stress on the sedimentary organic matter, because the values were typically biogenic near the surface and became more depleted in 12 C versus depth in holes at Sites 474, 478, and 481. The CH 4 at Site 477 was the heaviest, and in Hole 479 it did not show a dominant hightemperature component. The CO 2 at depth in most holes was mostly thermogenic and derived from carbonates. The low concentrations of C 2 -C 5 hydrocarbons in the headspace gas of canned sediments precluded a stable carbon-isotope analysis of their genetic origin.

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Section: Guaymas Basinmentioning

confidence: 99%

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Галимов¹,

Simoneit²

1982

Initial Reports of the Deep Sea Drilling Project

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“…The C 3 -C 5 hydrocarbon distributions above the upper sill complex exhibit a triple maximum that is less well developed for methane and ethane (Simoneit, this volume, Pt. 2; Einsele et al, 1980;Galimov and Simoneit, this volume, Pt. 2).…”

Section: Alteration Of Organic Mattermentioning

confidence: 99%

Sources, Preservation, and Maturation of Organic Matter in Pliocene and Quaternary Sediments of the Gulf of California: A Synthesis of Organic Geochemical Studies from Deep Sea Drilling Project Leg 64

Simoneit¹,

Summerhayes²,

Meyers³

1982

Initial Reports of the Deep Sea Drilling Project

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“…The C 3 -C 5 hydrocarbons above the sill at Site 481 exhibited multiple maxima (Einsele et al, 1980), whereas CH 4 and C 2 H 6 had a broad maximum at the same depth. These data, coupled with the fluorescence results showing a broad bitumen distribution above the upper sill (Fig.…”

Section: Resultsmentioning

confidence: 99%

Shipboard Organic Geochemistry and Safety Monitoring, Leg 64, Gulf of California

Simoneit¹

1982

Initial Reports of the Deep Sea Drilling Project

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I have evaluated shipboard data and preliminary interpretations related to organic geochemistry in light of additional shore-based analyses. Data on interstitial gas, the C/N ratio, and fluorescence indicate that organic matter was altered by sills and that these were all single intrusions except the upper sill complex at Site 481, which was a multiple emplacement. Site 477 had the highest in situ temperature, estimated from interstitial gas composition to be 225°C.

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

Cited by 270 publications

References 14 publications

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Sources, Preservation, and Maturation of Organic Matter in Pliocene and Quaternary Sediments of the Gulf of California: A Synthesis of Organic Geochemical Studies from Deep Sea Drilling Project Leg 64

Shipboard Organic Geochemistry and Safety Monitoring, Leg 64, Gulf of California

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