西藏日喀则地区恰布林组地层及构造背景分析

QIABULIN FORMATION STRATIGRAPHY AND ANALYSIS OF TECTONIC SETTING IN XIGAZE, TIBET

在恰布林组硅质岩砾石中获得较丰富的放射虫化石， 共鉴定放射虫化石１３ 属１５ 种，放射虫化石的时代为早白垩世早阿普第期， 根据地层上下关系， 将恰布林组的时代限定为早白垩世晚阿普第期。在此基础上， 结合恰布林组岩石组合特征、古水流特征、化石组合特征以及区域构造，

Abundant radiolarias are found in the gravels of conglomerates of the Qiabulin Formation. There are 13 genus and 15 species to have been identified. The age of the radiolaria is early Aptain of Cretaceous, and the one of the Qiabulin Formation is late Aptian in reference to overlying strata. The provenance of the Qiabulin Formation is volcanic arc and ophiolite complex formed in Cretaceous in the north of the Qiabulin Formation based on the sedimentary characteristics, directions of paleocurrent, fossil assemblages and regional geology.\;