柴达木盆地南缘石炭系Chondrites遗迹化石的发现及其地质意义  

Discovery of trace fossil Chondrites in the Carboniferous in south margin of Qaidam Basin and its geological significance

作　　者：牛永斌[1] 钟建华[1] 钟福平[2] 高玉飞[1] 禚元杰[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院 [2]中国科学院广州地球化学研究所,广东广州510640

出　　处：《古地理学报》2008年第5期529-535,共7页Journal of Palaeogeography：Chinese Edition

基　　金：国家重大基础研究前期课题(编号:2005CCA05000);国家重点基础研究“973”专项(编号:2006CB202401)资助

摘　　要：在柴达木盆地南缘野外地质调查过程中,在祁曼塔格山前石拐子剖面的下石炭统石拐子组和乌图美仁庆华铁矿剖面的上石炭统缔敖苏组中发现了大量Chondrites遗迹化石。经鉴定,研究区的Chondrites遗迹化石主要包括Chondrites fenxiangensis Yang,1984(分乡丛藻迹);Chondrites filifalx Volk,1964(细枝丛藻迹)和Chondrites maqianensis Yang,1988(玛沁丛藻迹)3个遗迹种。根据研究区的Chondrites遗迹化石特征,结合岩性特征和其他实体化石资料,认为石拐子地区早石炭世为台洼沉积环境,乌图美仁庆华铁矿地区晚石炭世为局限碳酸盐岩台地沉积环境。另外,探讨了生物扰动对研究区储集层的改造作用。该研究对恢复柴达木盆地南缘石炭系的沉积环境和古生态以及评价研究区的储集层物性具有重要的借鉴意义。Abundant trace fossils Chondrites were found in the Lower Carboniferous Shiguaizi Formation in Shiguaizi section and the Upper Carboniferous Di＇aosu Formation of the Qinghua iron mine section of Wutumeiren area at the toes of the Qimantage Mountains in the south margin of the Qaidam Basin. Three ichnospecies were identified ： Chondrites fenxiangensis Yang, 1984 ; Chondrites filifalx Volk, 1964 ; Chondrites maqianensis Yang, 1988. It is considered that the Early Carboniferous in Shiguaizi area was dominated by syneclise environment and the Late Carboniferous of Qinghua iron mine area was a restricted carbonate platform according to the trace fossils characteristics and the lithological characteristics as well as other body fossils information. Bioturbated reworking on reservoir, which is an essential influence in the reservoir quality, was also investigated. The investigation has a great reference significance in reconstructing the Carboniferous sedimentary environment and paleoecology and appraising the reservoir quality in the south margin of the Qaidam Basin.

关 键 词：柴达木盆地 石炭系 Chondrites遗迹化石 沉积环境 储集层 

分 类 号：Q911.28[天文地球—古生物学与地层学]