Origin and Alteration of Volcanic Ash and Pelagic Brown Clay, Deep Sea Drilling Project Leg 62, North-Central Pacific

Hein, James R.; Vanek, E.

doi:10.2973/dsdp.proc.62.120.1981

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The mineral suite (including phyllosilicates, feldspars, hematite, and anatase) from the late Albian-early Cenomanian siltstones in the Calera Limestone is very similar to late Albian ash-rich sediments recovered at DSDP Sites 465 and 466 (e.g., Hein and Vanek, 1981;Vallier and Jefferson, 1981) and suggests that the siltstones in sections B and C are at least partially derived from volcanic ash. The association of organic carbon with ash-rich sediments in the Calera Limestone and at DSDP sites raises the possibility that organic-carbon burial in the Pacifi c Ocean at the Albian-Cenomanian boundary was a response to local volcanism, which provided nutrients that stimulated marine productivity (e.g., Sinton and Duncan, 1997;Jenkyns, 1999Jenkyns, , 2003Larson and Erba, 1999).…”

Section: Implications For Late Albian-cenomanian Paleoceanographymentioning

confidence: 70%

Mid-Cretaceous oceanic anoxic events in the Pacific Ocean revealed by carbon-isotope stratigraphy of the Calera Limestone, California, USA

Robinson

Clarke

Nederbragt

et al. 2008

Geological Society of America Bulletin

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The paleoceanographic history of the Pacifi c Ocean during the mid-Cretaceous is poorly constrained due to the loss of much of the contemporaneous Pacifi c seafl oor to subduction and diffi culties in recovering chert-rich sediments by ocean drilling. Pelagic sediments that were originally deposited in the Pacifi c Ocean but that have been subsequently accreted during subduction potentially provide an alternative paleoceanographic archive. This study presents micropaleontological and carbon-isotope data from the Calera Limestone, part of the classic Franciscan Complex exposed in Permanente Quarry, central California, USA. In the three stratigraphic sections studied, pelagic limestones with low organic-carbon contents are the dominant lithology. However, two stratigraphic intervals are recognized that contain organic carbon, and these date to the early Aptian and late Albian-early Cenomanian. These time intervals correspond to two mid-Cretaceous oceanic anoxic events (OAEs): early Aptian OAE1a (equivalent to the "Selli level") and late Albian OAE1d (equivalent to the "Breistroffer event"). It is well established that both of these events were associated with signifi cant carbon-isotope excursions, which are also shown to exist in the Calera Limestone. The record of OAE1a from the Calera Limestone complements ocean drilling records by providing further evidence for variability in the sedimentary and stratigraphic record of this event. The carbon-isotope data from the late Albianearly Cenomanian provide the fi rst detailed chemobiostratigraphic record of this period for the Pacifi c Ocean, confi rming that environmental change occurred at this time in the Pacifi c, possibly related to OAE1d.

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Section: Implications For Late Albian-cenomanian Paleoceanographymentioning

confidence: 70%

Mid-Cretaceous oceanic anoxic events in the Pacific Ocean revealed by carbon-isotope stratigraphy of the Calera Limestone, California, USA

Robinson

Clarke

Nederbragt

et al. 2008

Geological Society of America Bulletin

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show abstract

“…Volcanic eruptions proximal to DSDP Site 463 are supported by sporadic preservation of thin tuffaceous layers locally preserved within the Barremian-Aptian sediments, particularly within the Selli Level Equivalent (Hein and Vanek, 1981;Vallier and Jefferson, 1981;Thiede et al, 1982). The provenance of these tuffs remains unknown, but given the proximity of the Mid-Pacific Mountains to the G-OJP, eruptions on that volcanically active LIP would be a plausible source.…”

Section: Dsdp Site 463 (Mid-pacific Mountains W Pacific Ocean)mentioning

confidence: 96%

Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)

Percival

Tedeschi

Creaser

et al. 2021

Global and Planetary Change

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Uranium and thorium enrichment in rocks from the base of DSDP Hole 465A, Hess Rise, central North Pacific

1982

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Origin and Alteration of Volcanic Ash and Pelagic Brown Clay, Deep Sea Drilling Project Leg 62, North-Central Pacific

Cited by 6 publications

References 22 publications

Mid-Cretaceous oceanic anoxic events in the Pacific Ocean revealed by carbon-isotope stratigraphy of the Calera Limestone, California, USA

Mid-Cretaceous oceanic anoxic events in the Pacific Ocean revealed by carbon-isotope stratigraphy of the Calera Limestone, California, USA

Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)

Uranium and thorium enrichment in rocks from the base of DSDP Hole 465A, Hess Rise, central North Pacific

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