阿尔金山东段安南坝早二叠世■类生物地层  

EARLY PERMIAN FUSULINE ASSEMBLAGES FROM THE ANNANBA SECTION,EASTERN ALTUN MOUNTAINS

作　　者：陈锐明[1] 陈奋宁[1] 辜平阳[1] 查显锋[1] 董增产[1] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《地层学杂志》2016年第1期51-56,共6页Journal of Stratigraphy

基　　金：中国地质调查局基础地质调查项目(1212011121193);国家青年基金项目(No.41002063)和(No.41102073)资助

摘　　要：阿尔金山东段安南坝剖面的因格布拉克组以断块形式出露在红柳沟—拉配泉混杂岩带中。该组下段以生物碎屑灰岩为主,含丰富■类及少量腕足动物、珊瑚化石。在因格布拉克组生物碎屑灰岩中发现■类化石9属12种,根据■类分布特征,划分为1个■组合:Sphaeroschwagerina sphaerica-Robustoschwagerina xiaodushanica组合。通过将该剖面■化石组合与其他地区相同层位的带■对比,认为安南坝剖面因格布拉克组的时代应属早二叠世紫松期,补充了该含■地层的时代依据,揭示出因格布拉克组在横向上有很强的穿时性。The Annanba section is located in eastern Altun,where the Yingebalake Formation outcrops in the Hongliugou-Lapeiquan melange belt as a fault-controlled block.The lower Yingebalake Formation is characterized by bioclastic limestones and contains abundant fusulinids,as well rare brachiopods and corals.In this study,12 fusuline species belonging to 9genera are recovered from bioclastic limestone of the Yingebalake Formation.These fusuline fossils belong to the Sphaeroschwagerina sphaerica-Robustoschwagerina xiaodushanica assemblage zone.Attempts are made to correlate the fusuline assemblage from the Yingebalake Formation with fusuline zones elsewhere,and on this basis of this correlation it is concluded that the Yingebalake Formation at the Annanba section is of Zisong Stage of the Lower Permian.This study provides biostratigraphic constraints on the age of the bioclastic unit of the Yingebalak Formation,and the new data suggest that the Yingebalake Formation is regionally diachronous.

关 键 词：生物地层 ■ 因格布拉克组 早二叠世 安南坝 阿尔金山 

分 类 号：P534.46[天文地球—古生物学与地层学]