东昆仑纳赤台岩群混杂堆积的古生物学证据及其地质意义  

Palaeontological Proof of the Naij Tal Group-Complex as Mélange Aggregation in the Eastern Kunlun Orogenic Belt and Its Geologic Significance

作　　者：郭宪璞[1] 王乃文[1] 丁孝忠[1] 赵民[1] 王大宁[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地质论评》2006年第3期289-294,i0001-i0002,共8页Geological Review

基　　金：国家自然科学基金资助项目(编号40272019);中国地质调查局资助项目(编号200313000054)的成果。

摘　　要：纳赤台岩群是东昆仑造山带一套构造—沉积混杂堆积地层,由各时期外来岩块和基质系统两大部分组成。以往曾依该岩群岩块中的珊瑚、腕足类、腹足类化石等划分为晚奥陶世或古生代。本文首次报道该岩群基质地层中发现的44属31种古近纪中—晚渐新世孢粉化石。这些化石的发现为厘定该岩群的地质时代、进一步确定该岩群为构造—沉积混杂堆积以及阐述东昆仑造山带形成演化机制等方面提供了有力证据,具有重要地质意义,而且在探讨古近纪生物地理区系和古环境等方面提供了重要参考资料。The Naij Tal Group-complex is tectonic-sedimentary mélange, which made of exotic blocks with different ages and matrix strata. On the basis of fossils yielded from the exotic blocks, the age of this group-complex was defined to the Late Ordovician or the Paleozoic. This time, 44 genera and 31 species of Paleogene sporopollen is newly found in samples from the matrix strata of this group-complex. It is of important geological significance for this new finding, to collating and stipulating the age of this group-complex, to further proving for mélange aggregation of this group-complex, to determining the age and explaining formation mechanism of the Eastern Kunlun orogenic belt.

关 键 词：古近纪 孢粉化石 纳赤台岩群 混杂堆积 东昆仑造山带 

分 类 号：Q911[天文地球—古生物学与地层学]