华南奥陶纪生物礁时空分布的控制因素(英文)  

FACTS CONTROLLING THE TEMPORAL AND SPATIAL DISTRIBUTIONS OF ORDOVICIAN REEFS IN SOUTH CHINA

作　　者：李越[1] S.KERSHAW 李军[1] 边立曾[1] 章森桂[1] 张俊明[1] 夏凤生[1] 

机构地区：[1]中国科学院南京地质古生物研究所,江苏南京210008 [2]BRUNEL大学地理与地球科学系

出　　处：《地层学杂志》2002年第1期9-17,共9页Journal of Stratigraphy

基　　金：中国科学院"九五"资源和环境研究重点项目 ( KZ95 2 -J1-0 2 3);国家自然科学基金 ( No.49872 0 0 5 ,No.49972 0 0 7);中国科学院古生物和古人类学基础研究特别支持费 ( No.990 6 0 5 )支持

摘　　要：华南奥陶纪生物礁主要分布于三个层位 ,选择了数个生物礁实例分析当时的古地理格局对礁相地层时空分布的控制作用。涉及到的生物礁赋存层位自下而上为 :特马道克晚期扬子地台中部宜昌分乡组和同时代的扬子地台南缘皖南的仑山组 ;阿伦尼克早期分布于地台中部至南缘的红花园组 ;阿什吉尔中期浙赣边区下镇组和三衢山组。研究结果表明 ,礁相地层的的发育与否及其生物和沉积结构在时空上表现出的分异 ,明显受控于与古地理背景的变迁相关的诸多因素 ,如海平面升降。Ordovician reefs of the South China Block are represented mainly in 3 horizons in ascending order: late Tremadoc reef of the Fenhsiang Formation and upper part of the Lunshan Formation; early Arenig reef of the Hunghuayuan Formation and middle Ashgill reef complex of the Xiazhen and the Sanjushan Formations. The biotic structures and sedimentary composition of these reefs, as well as their equivalent units, illustrate that their differentiation of facies were mainly controlled by the palaeogeographic evolution of South China, due to fluctuation of sea-level, magnitude of carbonate platforms, and uplift of sedimental accommodation respectively.

关 键 词：生物礁 古地理 奥陶纪 华南地区 时空分布 仑山组 红花园组 

分 类 号：P588.248[天文地球—岩石学]