摘要
通过 1∶5万孟连县、景信幅的区域地质调查 ,在孟连县北西 1∶2 0万孟连幅原划的“西部拉巴组”(原定为下二叠统 )中 ,采获Entactinia -Entactinosphaera组合共 4个属 6个种的放射虫化石 ,结合岩性组合、沉积相等特征 ,重新更正为中—上泥盆统曼信组。为研究该区的地层展布、大地构造环境、古地理、构造活动等提供了新资料。
During the recent regional geological surveying at a 1∶50 000 scale in Jingxin, Menglian, a radiolarian assemblage represented by Entactinia-Entactinosphaera including 6 species spaced in 4 genera has been obtained from the West Laba Formation in northwestern Menglian. This formation has been assigned to the Lower Permian in the 1:200 000 Menglian sheet. It is to be redetermined as the Middle Upper Devonian Manxin Formation on account of its rock association and sedimentary facies. This knowledge is of considerable geological significance in studying stratigraphy, tectonic setting, palaeogeography and structural activity in the surveyed area.
出处
《中国区域地质》
CSCD
2000年第2期127-130,186,T001,共6页
Regional Geology of China
关键词
岩石组合
放射虫
中-上泥盆统
滇西南
地层
rock association
Radiolaria
Middle Upper Devonian
southwest Yunnan
