摘要
晚三叠世甲丕拉组地层出露于藏东类乌齐地区,总体呈NW—SE向不等宽的条带状展布,通过近年来的1∶5万类乌齐县等4幅区调,将测区甲丕拉组由老至新划分为岩性组合不同的3个(一、二、三)岩性段。一段主要是一套紫红色砂砾岩,具山前河流砂砾岩相特征;二段主要是一套灰色砂岩、灰岩互层,具滨浅海钙质碎屑岩-碳酸盐相特征;三段为红色碎屑岩,具滨岸砂页岩相特征。各段化石种类亦不同。将甲丕拉组分段有助于藏东基础地质调查,为该区地层地质研究提供了新信息。
The late Triassic Jiapila Formation stratum was occurred in the Leiwuqi region, eastern Tibet, extending in NW-SE strike in a linear zone. Jiapila Formation was divided into 3 lithologic units （1,2,3） from old to new by four sets of 1：50,000 regional geologiea] investigations in Leiwuqi County in the recent years. The lithologic unit combinations and fossils for the four sets of units were different, the first unit was mainly composed of a suit of purplish red sandy conglomerate, with characteristics of piedmont river gravel facies ; the second unit was a suit of gray sandstone interbedded with limestone, with characteristics of offshore calcium clastic-carbonate; the third unit was red clastic rocks, with features of onshore sandy shale facies. The division of Jiapila Formation stratum was helpful to the fundamental geology survey in eastern Tibet, to provide new information for the stratigraphic geological research in the study region.
出处
《地质学刊》
CAS
2013年第1期24-30,共7页
Journal of Geology
基金
中国地质调查局"西藏1:5万协通
类乌齐镇
瓦昌达
类乌齐县幅区域地质调查"项目(1212010710211)
关键词
晚三叠世
甲丕拉组
岩石地层
沉积相
类乌齐地区
西藏
Late Triassic
Jiapila Formation
Lithostratigraphy
Sedimentary facies
Leiwuqi area
Tibet
