Hot fluids, burial metamorphism and thermal histories in the underthrust sediments at IODP 370 site C0023, Nankai Accretionary Complex SCIE SCOPUS

Cited 2 time in WEB OF SCIENCE Cited 2 time in Scopus
Title
Hot fluids, burial metamorphism and thermal histories in the underthrust sediments at IODP 370 site C0023, Nankai Accretionary Complex
Author(s)
Tsang, Man-Yin; Bowden, Stephen A.; Wang, Zhibin; Mohammed, Abdalla; Tonai, Satoshi; Muirhead, David; Yang, Kiho; Yamamoto, Yuzuru; Kamiya, Nana; Okutsu, Natsumi; Hirose, Takehiro; Kars, Myriam; Schubotz, Florence; Ijiri, Akira; Yamada, Yasuhiro; Kubo, Yusuke; Morono, Yuki; Inagaki, Fumio; Heuer, Verena B.; Hinrichs, Kai-Uwe
Publication Year
2020-02
Abstract
Drilling during International Ocean Discovery Program (IODP) Expedition 370 at Site C0023 encountered instances of hydrothermal mineralization from 775 to 1121 m below seafloor. Fluid inclusion homogenization temperatures measured on barite veins within this interval indicate precipitation from fluids with temperatures up to 220 degrees C, and salinities ten times higher than interstitial water (16-25 c.f. 2.8-3.6 wt % NaCl). Patches of stratabound mineralization (rhodochrosite, calcite, barite and anhydride) are largely confined to the vicinity of veins and have vertical thicknesses and extents that can be explained by precipitation within the thermal aureoles of veins. Thermal maturities measured on petroleum biomarkers in underthrust sediments record a rise from pre-oil window to early oil window thermal maturities. Basin models show that increases in thermal maturity can be explained by burial metamorphism, and kinetic-based calculations suggest that hot fluids would only have had a minimal effect on hydrocarbon generation. However, the movement of hot fluids still has geochemical implications and creates a complex thermal history where both short-duration, localized heating within fracture zones at hot temperatures (similar to 200 degrees C for less than 1 yr) and heating during burial over long durations (80-110 degrees C for 0.5-2 Myrs) need to be considered.
ISSN
0264-8172
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38739
DOI
10.1016/j.marpetgeo.2019.104080
Bibliographic Citation
MARINE AND PETROLEUM GEOLOGY, v.112, 2020
Publisher
ELSEVIER SCI LTD
Subject
SYSTEM H2O-NACL; FLOW; 0-DEGREES-C; 1000-DEGREES-C; SOLUBILITIES; PARAMETERS; 5000-BAR; 0-X-NACL; BASINS; MODEL
Keywords
Hot fluids; Biomarkers; Hydrothermal mineralization; Fluid inclusions; IODP 370 temperature limits; International Ocean Discovery Program
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCI LTD
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