Heavy sulfur-isotope enrichment in Middle Miocene onnagawa mudstones in the Green Tuff Region, Northeastern Japan

Kosei Komuro; Yoshimichi Kajiwara

doi:10.1111/j.1751-3928.2003.tb00158.x

Heavy sulfur-isotope enrichment in Middle Miocene onnagawa mudstones in the Green Tuff Region, Northeastern Japan

Kosei Komuro^*, Yoshimichi Kajiwara

^*Corresponding author for this work

Earth System Science

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Sulfur isotope ratios are analyzed for a series of mudstones in a successive section in the Taiheizan area in the central Green Tuff region, northeast Japan. The δ³⁴S values for the Uyashinai Mudstone Member (Nishikurosawa stage), the Onnagawa Formation and the Funakawa Formation range from -45 to -14 ‰, -20 to +4 ‰ and -30 to -10 ‰, respectively. There is a marked positive shift in δ³⁴S values at the Nishikurosawa/Onnagawa boundary and an upward δ³⁴S-decreasing trend in the Onnagawa and Funakawa Formations. The present data provides evidence for environmental change in the form of stratification of the seawater, initiated at the Nishikurosawa/Onnagawa boundary and persisting during deposition of the Onnagawa Formation followed by gradual oxygenation during deposition of the Funakawa Formation.

Original language	English
Pages (from-to)	61-65
Number of pages	5
Journal	Resource Geology
Volume	53
Issue number	1
DOIs	https://doi.org/10.1111/j.1751-3928.2003.tb00158.x
State	Published - 2003/03/01

Keywords

Anoxic environment
Green Tuff region
Mudstone
Onnagawa Formation
Paleoenvironment
Sulfur isotopes

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1111/j.1751-3928.2003.tb00158.x

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title = "Heavy sulfur-isotope enrichment in Middle Miocene onnagawa mudstones in the Green Tuff Region, Northeastern Japan",

abstract = "Sulfur isotope ratios are analyzed for a series of mudstones in a successive section in the Taiheizan area in the central Green Tuff region, northeast Japan. The δ34S values for the Uyashinai Mudstone Member (Nishikurosawa stage), the Onnagawa Formation and the Funakawa Formation range from -45 to -14 ‰, -20 to +4 ‰ and -30 to -10 ‰, respectively. There is a marked positive shift in δ34S values at the Nishikurosawa/Onnagawa boundary and an upward δ34S-decreasing trend in the Onnagawa and Funakawa Formations. The present data provides evidence for environmental change in the form of stratification of the seawater, initiated at the Nishikurosawa/Onnagawa boundary and persisting during deposition of the Onnagawa Formation followed by gradual oxygenation during deposition of the Funakawa Formation.",

keywords = "Anoxic environment, Green Tuff region, Mudstone, Onnagawa Formation, Paleoenvironment, Sulfur isotopes",

author = "Kosei Komuro and Yoshimichi Kajiwara",

year = "2003",

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day = "1",

doi = "10.1111/j.1751-3928.2003.tb00158.x",

language = "英語",

volume = "53",

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T1 - Heavy sulfur-isotope enrichment in Middle Miocene onnagawa mudstones in the Green Tuff Region, Northeastern Japan

AU - Komuro, Kosei

AU - Kajiwara, Yoshimichi

PY - 2003/3/1

Y1 - 2003/3/1

N2 - Sulfur isotope ratios are analyzed for a series of mudstones in a successive section in the Taiheizan area in the central Green Tuff region, northeast Japan. The δ34S values for the Uyashinai Mudstone Member (Nishikurosawa stage), the Onnagawa Formation and the Funakawa Formation range from -45 to -14 ‰, -20 to +4 ‰ and -30 to -10 ‰, respectively. There is a marked positive shift in δ34S values at the Nishikurosawa/Onnagawa boundary and an upward δ34S-decreasing trend in the Onnagawa and Funakawa Formations. The present data provides evidence for environmental change in the form of stratification of the seawater, initiated at the Nishikurosawa/Onnagawa boundary and persisting during deposition of the Onnagawa Formation followed by gradual oxygenation during deposition of the Funakawa Formation.

AB - Sulfur isotope ratios are analyzed for a series of mudstones in a successive section in the Taiheizan area in the central Green Tuff region, northeast Japan. The δ34S values for the Uyashinai Mudstone Member (Nishikurosawa stage), the Onnagawa Formation and the Funakawa Formation range from -45 to -14 ‰, -20 to +4 ‰ and -30 to -10 ‰, respectively. There is a marked positive shift in δ34S values at the Nishikurosawa/Onnagawa boundary and an upward δ34S-decreasing trend in the Onnagawa and Funakawa Formations. The present data provides evidence for environmental change in the form of stratification of the seawater, initiated at the Nishikurosawa/Onnagawa boundary and persisting during deposition of the Onnagawa Formation followed by gradual oxygenation during deposition of the Funakawa Formation.

KW - Anoxic environment

KW - Green Tuff region

KW - Mudstone

KW - Onnagawa Formation

KW - Paleoenvironment

KW - Sulfur isotopes

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U2 - 10.1111/j.1751-3928.2003.tb00158.x

DO - 10.1111/j.1751-3928.2003.tb00158.x

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SN - 1344-1698

VL - 53

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JO - Resource Geology

JF - Resource Geology

IS - 1

ER -

Heavy sulfur-isotope enrichment in Middle Miocene onnagawa mudstones in the Green Tuff Region, Northeastern Japan

Abstract

Keywords

ASJC Scopus subject areas

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