NDLI: First discovery and characterizations of late Cretaceous seep carbonates from Xigaze in Tibet, China

Content Provider	Springer Nature Link
Author	Tong, HongPeng Chen, DuoFu
Copyright Year	2012
Abstract	Hydrocarbon seeps, widely occurring in continental margins, have become increasingly focused owing to their close relationships with gas hydrates, strong greenhouse gas methane, and biological resources in extreme environments. Ancient hydrocarbon seeps have already been recognized from Devonian to Quaternary strata worldwide based on seep carbonates or seep-related fossil chemosynthetic assemblages. However, seep-related deposits are rarely found from ancient strata in the mainland China. Here, we report the first discovery of an ancient seep deposit, specifically late Cretaceous seep carbonates from Xigaze in Tibet, China. Xigaze seep carbonates, occurring as nodules, are enclosed in upper Cretaceous turbidite strata in Xigaze forearc basin. These carbonates are composed of authigenic carbonate (56.2% on average), clastic quartz and feldspar (27.3% on average), and clay minerals (chlorite, illite and smectite, 16.5% on average). Clotted micrites, peloids and framboid pyrites are frequently observed, all of which are common in modern seep carbonates. The carbonates have negative δ $^{13}$C values varying from −27.7‰ to −4.0‰(V-PDB), suggesting that thermogenic methane is the primary carbon source. Ce/Ce* values revised by eliminating La effects show no real Ce anomaly, indicating the carbonates were primarily precipitated in a weak reducing environment. Overall, these features provide unequivocal evidences that the seafloor of Xigaze forearc basin developed hydrocarbon seeps in late Cretaceous.
Starting Page	4363
Ending Page	4372
Page Count	10
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	57
Issue Number	33
e-ISSN	18619541
Language	English
Publisher	SP Science China Press
Publisher Date	2012-09-05
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	seep carbonate carbon isotope sedimentary fabric Xigaze late Cretaceous Life Sciences Physics Earth Sciences Engineering Science Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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