Geochemistry of Cenozoic Magmatism in South China Sea and Its Tectonic Implications
详细信息
- 责任者：Shi Xuefa (Key Lab. of Marine Sedimentary and Environment Geology ; The First Institute of Oceanography ; State Oceanic Administration ; Qingdao 266061 ; China) ; Yan Quanshu
- 刊名：Marine Geology & Quaternary Geology
- 出版年：2011
- 卷期：31(2)
- 关键词：岩浆活动 ; igneous activity ; 南海 ; South China Sea
- 页码：p.59-72
- 图表：7 illus., 85 refs.
- 分类号：0801
- issnNo：ISSN0256-1492
- isbnNo：CN37-1117/P
摘要
This paper studied the genesis and geochemical characteristics of the rocks, as well as their deep geodynamics and tectonic implications. Data show that there existed a bimodal volcanism in the northern margin of the SCS in earlier times (60～43 Ma or 32 Ma), followed by a relatively silent stage during the Cenozoic seafloor spreading (32～17 or 15.5 Ma), except for the central basin. And a large area of post-spreading volcanism(tholeiitic series for 17～8 Ma, alkali series since 8 Ma) affected the SCS and its adjacent areas (e.g., Pearl River Mouth Basin, Beibu gulf, Indochina block and the South China Sea basin). Finally, this study proposed that the igneous activities at fossil spreading centers in the SCS are similar to those in the East Pacific Rise and might be a new type of volcanism.
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