华南古特提斯东延问题的探讨  

On eastern extension of the paleo-Tethys in South China

作　　者：丘元禧[1] 张伯友[2] 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]中国科学院广州地球化学研究所,广东广州510640

出　　处：《中国区域地质》2000年第2期175-180,共6页Regional Geology of China

基　　金：国家自然科学基金!资助项目 (498730 0 8)

摘　　要：通过有关古特提斯洋的建造记录和后期构造变位分析 ,认为古特提斯洋东段的位置仍应在现今的青藏—滇西三江往南沿碧土、昌宁—孟连、程逸至马来半岛的文冬—劳勿、加里曼丹 (古晋 )、巴拉望经吕宋—台湾至日本一线 ,现今古特提斯洋古缝合带呈U字形是由于受到印度板块向北推挤、南海扩展以及菲律宾板块向西推挤扭曲改造而成。复原其在白垩纪末至新生代初期的展布方向应是近东西向的 ,现今的华南从桂西经桂东南、粤西、赣中至闽浙 ,也是北特提斯北部裂解大陆边缘 ,当古特提斯洋开始向北俯冲走向关闭时 。According to the records of the formations of the paleo Tethys and from an analysis of the tectonic displacement, it is considered that the east section of the paleo Tethys is defined by the boundary which extended from what is now Qinghai Tibet to West Yunnan, then southwards to Pütog, Changning Menglian, Uttarradit and Bentong Raub, passed through Pulau Kalimantan (Kuching), Palawan, Luzon, finally reached Taiwan and Japan. The present “U”shape of the paleo Tethys suture zone was attributed to the contortion caused by the northwards impinging of the Indian plate, the spreading of the South China Sea and the westwards pushing of the Philippine Sea plate since 45 Ma. But the restored paleo Tethys suture zone extended EW strikingly from late Cretaceous to early Cenozoic. Covering an area from West Guangxi, Southeast Guangxi, West Guangdong, Central Jiangxi, Fujian to Zhejiang, the present South China area belongs to an active continental margin, which would be converted from the disintegrated northern paleo Tethys during subduction northward at first to closing finally.

关 键 词：古特提斯洋 主缝合带 弧后盆地 大陆边缘裂谷 

分 类 号：P542.3[天文地球—构造地质学]