A 33 Ma lithostratigraphic record of tectonic and paleoceanographic evolution of the South China Sea
A 33 Ma lithostratigraphic record of tectonic and paleoceanographic evolution of the South China Sea
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南海构造和古海洋演化的33Ma岩石地层记录
DOI：
10.1016/j.margeo.2006.05.006
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发表时间：
2006-08
期刊：
影响因子：
2.9
通讯作者：
Zhong, Guangfa
中科院分区：
文献类型：
--
作者：
Wang, Pinxian;Li, Qianyu;Zhao, Quanhong;Cheng, Xinrong;Shao, Lei;Han, Zhimin;Tian, Jun;Su, Xin;Zhong, Guangfa
在ODP 1148站获得的853 m厚的沉积物序列提供了过去33 Ma以来南海构造和古海洋演化的前所未有的记录。岩石，生物和化学地层学研究有助于确定六个时期的变化，标志着中国南海地史的主要步骤。快速沉积的沉积速率为60米/Ma或更大的特点早渐新世裂谷。从457和495 mcd之间的滑塌单元的几个不整合面一起抹去了约3 Ma晚渐新世的记录，提供了坚实的证据，构造转型裂谷/缓慢扩张到快速扩张在南海。20-30 m/Ma的缓慢沉积表明中新世早期海底扩张是稳定的。溶解作用可能影响了中新世-更新世演替的完整性，其短期间断超出了目前的生物地层学分辨率。D-1 ~ D-5五个主要溶解事件反映了南海深水区的逐步发育，与渐新世后南海盆地的转型密切相关。中新世和上新世的局部和全球溶解事件的同时发生表明，气候强迫是导致世界大洋和边缘海深水环流变化的主要机制。上新世晚期和更新世南海恢复了60 m/Ma的高沉积速率，这是由于海平面频繁波动和海平面低位期间大面积陆架暴露导致的强烈的下坡输运所致。这六个古海洋学阶段分别对应于裂谷作用（33- 28.5Ma），向南变化扩展（28.5-23 Ma），稳定伸展至伸展结束（23-15 Ma），扩张后平衡（15-9 Ma），进一步改造和季风影响（9-5 Ma），冰川盛行（5-0 Ma），在过去的33 Ma中，南海由一系列深地堑转变为一个迅速扩张的开放海湾，最终成为一个半封闭的边缘海。
The 853 m thick sediment sequence recovered at ODP Site 1148 provides an unprecedented record of tectonic and paleoceanographic evolution in the South China Sea over the past 33 Ma. Litho-, bio-, and chemo-stratigraphic studies helped identify six periods of changes marking the major steps of the South China Sea geohistory. Rapid deposition with sedimentation rates of 60 m/Ma or more characterized the early Oligocene rifting. Several unconformities from the slumped unit between 457 and 495 mcd together erased about 3 Ma late Oligocene record, providing solid evidence of tectonic transition from rifting/slow spreading to rapid spreading in the South China Sea. Slow sedimentation of ∼20–30 m/Ma signifies stable seafloor spreading in the early Miocene. Dissolution may have affected the completeness of Miocene–Pleistocene succession with short-term hiatuses beyond current biostratigraphical resolution. Five major dissolution events, D-1 to D-5, characterize the stepwise development of deep water masses in close association to post-Oligocene South China Sea basin transformation. The concurrence of local and global dissolution events in the Miocene and Pliocene suggests climatic forcing as the main mechanism causing deep water circulation changes concomitantly in world oceans and in marginal seas. A return of high sedimentation rate of 60 m/Ma to the late Pliocene and Pleistocene South China Sea was caused by intensified down-slope transport due to frequent sea level fluctuations and exposure of a large shelf area during sea level low-stands. The six paleoceanographic stages, respectively corresponding to rifting (∼33–28.5 Ma), changing spreading southward (28.5–23 Ma), stable spreading to end of spreading (23–15 Ma), post-spreading balance (15–9 Ma), further modification and monsoon influence (9–5 Ma), and glacial prevalence (5–0 Ma), had transformed the South China Sea from a series of deep grabens to a rapidly expanding open gulf and finally to a semi-enclosed marginal sea in the past 33 Ma.
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影响因子：
--
作者：
A. Ramsay;T. J. Sykes;R. Kidd
通讯作者：
A. Ramsay;T. J. Sykes;R. Kidd
影响因子：
4.9
作者：
A. Naidu;T. C. Mowatt
通讯作者：
A. Naidu;T. C. Mowatt
影响因子：
1.9
作者：
Qianyu Li;Z. Jian;X. Su
通讯作者：
Qianyu Li;Z. Jian;X. Su
影响因子：
--
作者：
G. Keller;J. Barron
通讯作者：
G. Keller;J. Barron
DOI：
10.1016/s0031-0182(02)00508-4
发表时间：
2002-11
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
K. Grant;G. Dickens
通讯作者：
K. Grant;G. Dickens