The Origin, Evolution, and Environmental Impact of Oceanic Large Igneous Provinces

Geochemistry of an Aptian bedded chert succession from the deep Pacific basin: New insights into Cretaceous oceanic anoxic event (OAE) 1a
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Published:May 01, 2015
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Junichiro Kuroda, Natsuko Ihoriya, Rie S. Hori, Nanako O. Ogawa, Minoru Ikehara, Masaharu Tanimizu, Naohiko Ohkouchi, 2015. "Geochemistry of an Aptian bedded chert succession from the deep Pacific basin: New insights into Cretaceous oceanic anoxic event (OAE) 1a", The Origin, Evolution, and Environmental Impact of Oceanic Large Igneous Provinces, Clive R. Neal, William W. Sager, Takashi Sano, Elisabetta Erba
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We present a comprehensive data set of organic and inorganic geochemistry from a lower Cretaceous pelagic bedded chert succession of the Shimanto accretionary belt in the Yokonami Peninsula (Kochi, Japan). Based on stable isotopic composition of total organic carbon (δ13Corg), in conjunction with radiolarian biostratigraphic data, we propose that a 1.3-m-thick interval within the examined section is correlative with Tethyan Selli Level (Apennines, Italy), a sedimentary expression of oceanic anoxic event (OAE) 1a. Specifically, the δ13Corg record illustrates a discernible negative shift and subsequent positive excursions upsection, a pattern that resembles the typical...
- alteration
- Aptian
- Asia
- biostratigraphy
- C-13/C-12
- carbon
- carbon cycle
- cerium
- chemically precipitated rocks
- chemostratigraphy
- chert
- clastic rocks
- correlation
- Cretaceous
- electron microscopy data
- europium
- Far East
- geochemical anomalies
- geochemical cycle
- hydrothermal alteration
- Invertebrata
- isotope ratios
- isotopes
- Japan
- Kochi Japan
- lead
- Lower Cretaceous
- major elements
- melange
- Mesozoic
- metals
- metasomatism
- microfossils
- mudstone
- oceanic anoxic events
- Ontong Java Plateau
- organic compounds
- Pacific Ocean
- paleogeography
- Pb-206/Pb-204
- Pb-207/Pb-204
- Pb-208/Pb-204
- pelagic environment
- Protista
- radioactive isotopes
- Radiolaria
- rare earths
- reconstruction
- sandstone
- sedimentary rocks
- SEM data
- Shikoku
- Shimanto Belt
- stable isotopes
- total organic carbon
- trace elements
- variations
- volcanism
- West Pacific
- Yokonami Peninsula