U/Th dating of cold-seep carbonates: An initial comparison

被引：56
作者：
Feng, Dong [1 ,2 ]
Roberts, Harry H. [2 ]
Cheng, Hai [3 ,4 ]
Peckmann, Joern [5 ]
Bohrmann, Gerhard [6 ]
Edwards, R. Lawrence [4 ]
Chen, Duofu [1 ]
机构：
[1] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China
[2] Louisiana State Univ, Inst Coastal Studies, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 USA
[3] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China
[4] Univ Minnesota, Dept Geol & Geophys, Minneapolis, MN 55455 USA
[5] Univ Vienna, Ctr Earth Sci, Dept Geodynam & Sedimentol, A-1090 Vienna, Austria
[6] Univ Bremen, MARUM, D-28334 Bremen, Germany
来源：
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY | 2010年 / 57卷 / 21-23期
关键词：
U/Th dating; Cold seeps; Authigenic carbonate; Gulf of Mexico; Congo Fan; Black Sea; GULF-OF-MEXICO; AUTHIGENIC CARBONATES; CONTINENTAL-SLOPE; FLUID-FLOW; ANAEROBIC OXIDATION; CASCADIA MARGIN; HYDRATE RIDGE; METHANE SEEPS; BLACK-SEA; SEDIMENTS;
D O I：
10.1016/j.dsr2.2010.09.004
中图分类号：
P7 [海洋学];
学科分类号：
0707 ;
摘要：
Authigenic carbonates from hydrocarbon seeps are unique archives of past seepage and associated environmental parameters. In order to constrain the ages of a set of seep carbonates and the time involved in carbonate formation, we applied Uranium/Thorium (U/Th) dating to samples from the Gulf of Mexico, the Congo Fan, and the Black Sea. The resulting U/Th ages indicate that environmental conditions must have been favorable for enhanced methane-rich fluid seepage during the time intervals of 53.4 to 1.7 ka BP for the Gulf of Mexico and 45.5 to 3.0 ka BP for the Congo Fan. The seep carbonates from the Black Sea formed at 1.6 to 1.1 ka BP. Our results suggest that enhanced fluid flow during these time intervals was closely related to 1) sea-level variations associated with glacial/interglacial cycles and 2) environmental alterations in the course of late Quaternary climate change, including variations in bottom-water temperatures that affected the stability of gas hydrate reservoirs. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2055 / 2060
页数：6
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