西准噶尔恰达一带志留系玛依拉山组滑塌堆积岩发现及意义  

GEOLOGICAL CHARACTERISTICS AND ITS SIGNIFICANCE OF OLISTROMES OF SILURIAN MAYILASHAN FORMATION OF QIADA AREA IN THE WEST JUNGGAR,XINJIANG

作　　者：仲星[1] 张洪伟[2] 李永军[1] 刘振伟[1] 王海博[1] 

机构地区：[1]长安大学地球科学与资源学院,西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [2]新疆地质矿产勘查开发局第七地质大队,新疆乌苏市833000

出　　处：《新疆地质》2011年第4期367-371,共5页Xinjiang Geology

基　　金：新疆维吾尔自治区地质矿产调查项目(XJZBKD2008-04)资助

摘　　要：滑塌堆积是由滑动作用导致岩性或岩相相同岩块和泥质基质相混杂且层理不发育的沉积体.在新疆西准噶尔恰达一带志留系玛依拉山组上部发现一套特殊沉积层,经岩性特征、分布层位、构造形变及空间组合关系研究,厘定为滑塌堆积.此次发现,证实恰达一带中晚志留世晚期正处于盆地斜坡带位置.玛依拉山组滑塌堆积岩的发现,为恢复和建立西准噶尔志留纪沉积环境和古地理演化提供可靠依据,为进一步分析志留纪盆地演化提供了重要佐证.The olistromes are interpreted as the deposits consisting of heterogeneous material （rock blocks and mud）,caused by slumping or gravity sliding of unconsolidated sediments,and lens like layer with no ture bedding,deposited within normal bedding sequences on the continental slope.We new found a set of special facies at the upper layer of silurian Mayilashan formation of the Qiada area in the West Junggar, after careful lithologic features,distribution horizon, tectonic deformation and space combination relations for its redefinition of slump accumulation. The discovery, confirmed the Qiada area in Middle-Late Silurian in slope belt of basinal facies.Identify the olistostrome with in Mayilashan Formation,which can provide some reliable evidences for Silurian sedimentary environment and paleogeography evolution of the West Junggar, also for further analysis of basin evolution beings offers important evidence.

关 键 词：西准噶尔 玛依拉山组 滑塌堆积 地质意义 

分 类 号：P56[天文地球—构造地质学]