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| 南海西部围区中特提斯东延通道问题 | |
| 引用本文： | 周蒂,颜佳新,丘元禧,陈汉宗,孙珍.南海西部围区中特提斯东延通道问题[J].地学前缘,2003,10(4):469-477. |
| 作者姓名： | 周蒂 颜佳新 丘元禧 陈汉宗 孙珍 |
| 作者单位： | 1. 中国科学院,南海海洋研究所与广州地球化学研究所边缘海地质重点实验室,广东,广州,510301 2. 中国地质大学,地球科学学院,湖北,武汉,430074 3. 中山大学,地质系,广东,广州,510275 |
| 基金项目： | 国家重大基础研究发展规划课题(G2000046702)，国家专项(2001DIA50041)，中国科学院重要方向项目(KZCX2-SW-117-05) |
| 摘 要： | 通过对南海西部围区中生代岩相古地理资料的收集整理和分析,编制了该区T_2,T_3~1,T_3~2,T_3~3,J_1-J_2,J_3-K_1共6个时段的岩相古地理简图,根据其中生代海相地层的时空分布和岩相特征,讨论了尚存争议的中特提斯进入南海的通道问题。实际资料表明,黑水河盆地在三叠纪受印支运动影响完成了从海到陆的过程,之后不再出现海相沉积,中特提斯不可能从红河裂谷带进入南海。在新加坡所见的晚三叠世至早侏罗世浅海至陆相沉积代表古特提斯的残余海,到中侏罗世完全消失。早侏罗世时期在印支半岛南部出现的近南北走向的海湾可能经过泰国湾与当时的滇缅海相通;但是这个海湾浅而短暂,滇缅海能否从这里进入南海值得怀疑,更不可能是中特提斯的通道。在南海西部围区,迄今已证实的中生代洋壳碎片(蛇绿岩套)和深海沉积仅见于南部Woyla—Maratus—Lupar一线及其附近。这套延伸2000余km,从洋壳、深海到浅海岩相齐全的岩石所代表的晚侏罗世至早白垩纪世大洋应是中特提斯洋的一部分。中特提斯东延而最可能是走南路,即从班公一怒江带南下之后,经Woyla线穿过苏门答腊岛,绕加里曼丹岛南缘到Maratus线,向北再经沙巴到Lupar线,在沙捞越北部或纳土纳岛附近进入南海。 |
| 关 键 词： | 岩相古地理 中特提斯 中生代 南海西部围区 |
| 文章编号： | 1005-2321(2003)04-0469-09 |
| 修稿时间： | 2003年4月23日 |
ROUTE FOR THE EASTERN EXTENSION OF MESO-TETHYS IN THE WESTERN ENVIRONS OF THE SOUTH CHINA SEA |
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| ZHOU Di,YAN Jia-xin,QIU Yuan-xi,CHEN Han-zong,SUN Zhen Laboratory of marginal sea Geology,South China Sea Institute of Oceanology and guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China, Faculty of Earth Science,China University of Earth Sciences,Wuhan ,China.ROUTE FOR THE EASTERN EXTENSION OF MESO-TETHYS IN THE WESTERN ENVIRONS OF THE SOUTH CHINA SEA[J].Earth Science Frontiers,2003,10(4):469-477. | |
| Authors: | ZHOU Di YAN Jia-xin QIU Yuan-xi CHEN Han-zong SUN Zhen Laboratory of marginal sea Geology South China Sea Institute of Oceanology and guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Faculty of Earth Science China University of Earth Sciences Wuhan China |
| Institution: | ZHOU Di,YAN Jia-xin,QIU Yuan-xi,CHEN Han-zong,SUN Zhen Laboratory of marginal sea Geology,South China Sea Institute of Oceanology and guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510301,China, Faculty of Earth Science,China University of Earth Sciences,Wuhan 430074,China, Department of Geology,Zhongshan University,Guangzhou 510275,China |
| Abstract: | Lithofacies and paleogeography maps of 6 Mesozoic time slices (T2 ,T_3~1 ,T_3~2 ,T_3~3 ,J1-J2 ,J3-K1 ) are compiled for the western environs of the South China Sea (23°N to 3°S,98°E to 110°E) based on col-lected data. The controversial problem that on which route Meso-Tethys entered the area where the present-day South China Sea occupies is explored based on this compilation. The Song Da basin in northern Indochina Peninsular completed its evolution from sea to land by the end of Late Triassic, and has kept emergent ever since. Thus Meso-Tethys could not enter the South China Sea through the Song Da basin. The Late Trissic to Early Jurassic shallow marine to continental elastics once found in Singapore represents a piece of residual sea of Paleo-Tethys which disappeared in Middle Jurassic. In Early Jurassic a S-N elongated wide gulf appeared in the southern Indochina peninsular and might be connected westward to the Yunnan-Burma Sea. But this gulf was shallow and ephemeral and could not be the route for Meso-Tethys. In the entire region, Mesozoic abyssal sediments and ophiolites are seen only along the Woyla-Maratus-Lupar line in the south. A complete set of Late Jurassic to Early Cretaceous oceanic crust, abyssal to shallow marine rocks extending over 2 000 km along this line should be the remains of Meso-Tethys. Thus our compilation supports the proposition that Meso-Tethys extended from the Bangong-Nujiang line southward, through Sumatera along the Woyla line, then circled the SW Borneo micro-continent along the Maratus line, then reached the Lupar line, and finally entered the area of the South China sea at some places near the Natuna Islands or NW Sarawak. |
| Keywords: | lithofacies and paleogeography Meso-Tethys Mesozoic western environs of the South China Sea |
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