东昆仑西段早-中二叠世生物礁相地层层序  

Stratigraphic Sequence of the Early-Middle Permian Reef in Western East Kunlun Mountains

作　　者：田树刚[1] 王增吉[1] 

机构地区：[1]中国地质科学院地质研究所

出　　处：《地球学报》2001年第3期243-248,共6页Acta Geoscientica Sinica

基　　金：国家自然科学基金会 (项目号 :No .49872 0 0 1);中国新星石油公司 (项目号 :No .XYK-98-11)资助项目的部分成果

摘　　要：本文以大量化石资料为基础 ,结合生物礁研究成果 ,重建了东昆仑造山带西段早—中二叠世礁相地层层序 ,确定了地层时代归属。礁相地层自下而上分为 5个岩组。阿其克库勒组为陆块边缘碎屑陆棚之上的碳酸盐沉积和丘状生物礁建造 ,可建立　类Schwagerina Eoparafusulina组合带和Chalaroschwagerina Pseudofusulinaparafecunda组合带 ,对比为下二叠统的中上部。查德尔塔格组为海侵期巨厚块状障壁礁碳酸盐岩 ,包含　类Mis ellinaclaudiae组合和一个未定名组合 ,属中二叠世栖霞期。青石山组和碧云山组为同时异相沉积。前者以礁核相骨架灰岩为主 ,厚度巨大 ;后者为礁后 泻湖相黑色富有机质岩层 ,厚度较薄。二岩组同属　类Polydiexodina Neoschwagerina组合带内Cancellinaliuzhiensis亚带、Neoschwagerinasimplex亚带和Afghanellaschencki亚带的层位 ,时代为中二叠世茅口早—中期。喀尔瓦组为类复理石相砂板岩夹泥丘灰岩 ,含Afghanellaschencki亚带的　化石 ,地层时代与青石山组 (或碧云山组 )上部相当。Based on data of reefs and foraminifera fossils, the authors have reconstructed a stratigraphic sequence of the Early-Middle Permian reefs in the western section of the East Kunlun. The sequence consists of 5 lithologic formations. The Aqikekule formation is composed of carbonates and knoll reef buildups on clastic continental margin of the plateau. Fusulinids in the formation, which can make up the Chalaroschwagerina-Pseudofusulina parafecunda assemblage zone, prove that the age of the unit is middle-late Early Permian. The Chadertaq Formation consists mainly of block bedded framestones of the well reef and contains the Misellina claudiae fusulinid fauna, corresponding to Middle Permian Qixia period. The Qingshishan Formation and the Biyunshan Formation were formed under different conditions, but were synchronous in the early-middle Maokouan period of Middle Permian. The former was comprised mainly of reef-core framestone and reef breccia in great thickness. The latter resulted from the deposition of dark and organic-rich material in the back reef and the lagoon. Both contain the Polydiexodina-Neoschwagerina assemblage zone, belonging separately to the Cancellina liuzhiensis subzone, the Neoschwagerina simplex subzone and the Afghanella schencki subzone. The Karva Formation includes flyschoid sandstone and slate intercalated with mudmound limestone and yields fusulinids of the Afghanella schenck subzone. This formation is comparable with the mid-upper part of the Maokouan.

关 键 词：东昆仑 TING类化石 礁相地层层序 二叠世 生物礁 地层时代 

分 类 号：P588.248[天文地球—岩石学] Q911.6[天文地球—地质学]