TAILIEUCHUNG - Báo cáo " Cenozoic magmatism of Eastern Sea (South China Sea) "

In Eastern Sea (South China Sea), Jurassic - Cretaceous magmatic intrusives are discovered, they were cutting the Pre-Cenozoic sedimentaries. The Cenozoic volcanic basalts are strongly distributed together with Cenozoic sedimentaries. The paper concerns only the volcanic activities with description on their geology, chemistry, geochemistry, isotopic ages and their forming mechanism. In fact, the main topic of the paper is dealt with the forming mechanism of basalt in the dynamics of the opening of Eastern Sea in particular, and of South China Sea in general. Keywords: Cenozoic; Magmatism; Eastern Sea. 1. Generality on cenozoic geology of Eastern Sea* The geomorphology and. | VNU Journal of Science Earth Sciences 23 2007 43-51 Cenozoic magmatism of Eastern Sea South China Sea Phan Truong Thi1 Vo Viet Van2 1 College of Science VNU Hanoi 2 University of Technology VNU Ho Chi Minh City Received 07 January 2008 received in revised form 12 March 2008 Abstract. In Eastern Sea South China Sea Jurassic - Cretaceous magmatic intrusives are discovered they were cutting the Pre-Cenozoic sedimentaries. The Cenozoic volcanic basalts are strongly distributed together with Cenozoic sedimentaries. The paper concerns only the volcanic activities with description on their geology chemistry geochemistry isotopic ages and their forming mechanism. In fact the main topic of the paper is dealt with the forming mechanism of basalt in the dynamics of the opening of Eastern Sea in particular and of South China Sea in general. Keywords Cenozoic Magmatism Eastern Sea. 1. Generality on cenozoic geology of Eastern Sea The geomorphology and general distribution picture of Eastern Sea crust types are presented in Fig. 1. The given data are received from the research of satellite images and of geophysic measurements. The crusts are covered by Cenozoic sedimentaries 2 3 . Their geomagnetic ages are also represented in Fig. 2 2 3 . The geomagnetic anomalies lines Ma and N13 32 Ma are remarked they also are recognized as the timing of the opening and closing of Eastern Sea in his geodynamics respectively. The follows are Late Miocene and Pliocene sedimentaries covered all the territory of the South China Sea. These results are obtained Fig. 1. The geomorphology and structure of crust types of South China Sea. Formatted Font Palatino Linotype 9 pt Formatted Font Palatino Linotype 9 pt Formatted Font Palatino Linotype 9 pt Corresponding author. Tel. 84-913535203 E-mail banganus@ by scientific cooperation between Hanoi University and Paris VI University 8 9 12 . 43 44 Phan Truong Thi Vo Viet Van VNU Journal of Science Earth Sciences 24 2008 43-51 2. .

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