| 摘要: |
| 扬子台地西缘由于构造的逆冲推覆与平移走滑而受到严重破坏,因此,对其古地理重建就不能简单地依据现今露头岩相分布原封不动地来拟定古地理格架。为此,本文尝试采用"构造岩块分析法",对这些位移了的岩块(断块)进行构造复位后,再编制旱、中三叠世古地理复原图,重建其古地理演化格架。扬子台地西部边缘在早三叠世发育了进积的碳酸盐粒浅滩,滩后为海湾或局限台地,滩前为碳酸盐缓坡;中三叠世时,边缘的南、北段有差异,北段滩前由缓坡(早世)演化成末端变陡的碳酸盐缓坡,而南段则发展成镶边陆架。 |
| 关键词: 古地理重建 构造岩块法 早、中三叠世 扬子台地西缘 |
| DOI： |
| 附件 |
| 投稿时间：1994-10-20 |
| 基金项目: |
|
| PALAEOGEOGRAPHIC RECONSTRUCTION OF THE WESTERN MARGIN OF THE YANGTZE PLATFORM DURING THE EARLY AND MIDDLE TRIASSIC |
| Wu Yinglin, Yan Yangji, Qin Jianhua |
| (Chengdu Institute of Geology and Mineral Resources) |
| Abstract: |
| The western margin of the Yangtze platform was once a passive continental margin during the Early and Middle Triassic, and dismembered into a number of displaced struc-tural blocks (fault blocks) owing to subsequent thrust napping and translation gliding. This study is intended to conduct tectonic restoration and palaeogeographic reconstruction with the aid of tectonic block techniques in terms of the deep-seated geophysical data. |
| Key words: palaeogeographic reconstruction tectonic block technique Early and Middle Triassic western margin of the Yangtze platform |
