新疆柯坪地区晚石炭世-早二叠世腕足动物群  

Brachiopod Fauna of Carboniferous-Permian in Keping Area,Xinjiang

作　　者：刘磊[1] 李钰欣 杨宝忠[1] 葛延鹏 于博宾 

机构地区：[1]中国地质大学(武汉)地球科学学院,武汉430074 [2]中国人民武装警察部队黄金第七支队,山东烟台264004 [3]合肥工业大学,合肥230000

出　　处：《地质科技情报》2017年第3期18-26,共9页Geological Science and Technology Information

基　　金：中国地质调查局西北沿边及特殊地区地质矿产调查二级项目(DD20160079);中国地质调查局项目"新疆柯坪地区晚古生代地层综合研究"(2015010038)

摘　　要：通过对新疆柯坪地区上石炭统-下二叠统康克林组和巴立克立克组腕足动物化石的系统研究,共鉴定出46属82种,根据垂向分布将腕足动物群划分为5个组合,其中康克林组自下而上划分为Avonia-Dictyoclostus组合,Schizophoria-Brachythyrina组合,Orthotetina-Chonetes组合和Compressoproductus-Enteletes组合;巴立克立克组划分为Plicatifera-Liraplecta组合。区域对比表明,研究区晚石炭世-早二叠世腕足动物群生物古地理区属于特提斯大区,混有少量北方大区冷水型分子,早二叠世混生的冷水型分子较晚石炭世明显增加。从Orthotetina-Chonetes组合开始,明显出现早二叠世分子。腕足动物的演化阶段特征表明,腕足动物群对石炭系-二叠系界线的响应明显滞后于牙形刺和类等生物门类,即明显变化发生在康克林组的中下部。By collecting brachiopod fossils from Carboniferous-Permian Kangkelin Formation and Balikelike Formation in Keping Area, Xinjiang, we have obtained more than 200 bachiopod fossils and indentified 82 species in 46 genera. According to the development of the brachiopod fauna and phases of evolution, five assemblages are established. Among them, Kangkelin Formation is marked with four assemblages upward- ly. Avonia-Dictyoclostus assemblage, Schizophoria-Brachyth yrina assemblage, Orthotetina-Chonetes as- semblage and Compressoproductus-Enteletes assemblage;brachiopods of Balikelike Formation is assigned to Plicatifera-Liraplecta assemblage. With regional correlation, the brachiopod fauna of the study area, mixing a few Boreal realm cool-water-type brachiopods, is assigned to the Tethy district in the Palaeobio- graphic region. In addition, there are more boreal realm brachiopods in the Early Permian than in the Late Carboniferous. The Early Permian hrachiopods are firstly found in the Orthotetina-Chonetes assemblage. The analysis of the evolutionary characters of five brachiopod assemblages shows that the reaction of bra- chiopod fauna around Carboniferous-Permian boundary is slower than the conodont and fusulinis, which change obviously at the lower part of Kangkelin Formation.

关 键 词：柯坪 腕足动物群 古生物地理区 早二叠世 

分 类 号：Q915.816[天文地球—古生物学与地层学]