FN Archimer Export Format
PT J
TI Gas hydrate dissociation during sea‐level highstand inferred from U/Th dating of seep carbonate from the South China Sea
BT 
AF Chen, Fang
   Wang, Xudong
   Li, Niu
   Cao, Jun
   Bayon, Germain
   Peckmann, Jörn
   Hu, Yu
   Gong, Shanggui
   Cheng, Hai
   Edwards, R. Lawrence
   Ning, Youfeng
   Jin, Meng
   Huang, Huiwen
   Wu, Cong
   Sun, Yuedong
   Chen, Hong
   Zhou, Yang
   Chen, Duofu
   Feng, Dong
AS 1:1;2:2,3,4,5;3:3;4:1;5:4;6:6;7:7;8:7;9:8,9;10:8;11:9;12:3,5;13:3,5;14:1;15:3,5;16:1;17:1;18:2,7;19:2,7;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LGS;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;
C1 MNR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Ministry of Natural Resources Guangzhou Guangdong ,China
   Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology Qingdao ,China
   CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences Guangzhou ,China
   IFREMER, Marine Geosciences Unit F‐29280 Plouzané, France
   University of Chinese Academy of Sciences Beijing, China
   Institute for Geology, Center for Earth System Research and Sustainability, Universität Hamburg Hamburg ,Germany
   Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University Shanghai ,China
   Department of Earth Sciences University of Minnesota Minneapolis MN, USA
   Institute of Global Environmental Change, Xi'an Jiaotong University Xi'an, China
C2 CHINA GEOL SURVEY, CHINA
   QNLM, CHINA
   CHINESE ACAD SCI, CHINA
   IFREMER, FRANCE
   UNIV CHINESE ACAD SCI, CHINA
   UNIV HAMBURG, GERMANY
   UNIV SHANGHAI OCEAN, CHINA
   UNIV MINNESOTA, USA
   UNIV XI AN JIAO TONG, CHINA
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 4.497
TC 35
UR https://archimer.ifremer.fr/doc/00593/70555/68725.pdf
   https://archimer.ifremer.fr/doc/00593/70555/68727.pdf
LA English
DT Article
DE ;methane seep gas hydrate seep carbonate
AB Gas hydrates represent a huge reservoir of methane in marine sediments, prone to dissociation in response to environmental changes. There is consensus that past events of gas hydrate dissociation in the marine environment mainly occurred during periods of low sea‐level. Here, we report geochemical data for two meter‐thick layers of seep carbonate collected from a hydrate‐bearing drill core from ~800 m water depth in the northern South China Sea. The aragonite‐rich carbonates reveal positive δ18O values, confirming a genetic link with gas hydrate dissociation. Uranium‐thorium dating of seep carbonates indicates that gas hydrates at the study site dissociated between 133,300 and 112,700 yr BP, hence coinciding with the Last Interglacial (MIS 5e) sea level highstand. We put forward the concept that a climate‐driven increase in temperature was responsible for a period of pronounced gas hydrate dissociation. Plain Language Summary The gas hydrate reservoir is a dynamically changing system extremely susceptible to variations of seafloor temperature and pressure. Therefore, gas hydrate dissociation and subsequent methane seepage frequently occur during times of global climate change, especially during sea level lowstands with reduced seabed pressure. However, this conclusion was mainly based on dating of seep carbonates sampled from the seabed. As a consequence, one cannot exclude that previous results have been compromised by a sampling bias since seafloor samples are easier to collect. Authigenic seep carbonates from drill cores represent a continuous record of gas hydrate dynamics. Our uranium‐thorium dating of seep carbonate from drill cores provides a unique example of the effects of temperature and pressure on the stability of the hydrate system in the Dongsha area, northern South China Sea (SCS), during the last interglacial stage (MIS 5e, about 130,000 years BP). Representing the most similar and most contemporary analogue to the current interglacial, the study of a methane release event in the SCS during MIS 5e will shed light on the expected trend of methane release events in the future, while providing insight into the response of low latitude oceans to climate change. 
PY 2019
PD DEC
SO Geophysical Research Letters
SN 0094-8276
PU American Geophysical Union (AGU)
VL 46
IS 23
UT 000500911800001
BP 13928
EP 13938
DI 10.1029/2019GL085643
ID 70555
ER

EF