摘要
位于兰坪 -思茅坳陷带西侧近南北向的维西 -无量山 -景洪地质块体 ,根据地球物理资料结合地质综合分析 ,具有裂陷带的特征。自泥盆纪开始地幔上隆 ,形成隆起带 ,地壳产生东西向拉张 ,局部出现火山活动 ,石炭纪至三叠纪以中酸性为主的火山岩浆大量喷发 ,早侏罗世关闭 ,中新生代沉积厚大碎屑岩系。伴随裂陷带的生成、演化形成许多大中型矿床。
According to the geophysical data and geological comprehensive analysis,the nearly south-north Weixi-Wuliangshan-Jinghong geological bolck on the west side of Lanping-Simao depression zone is characterized by a fault depression zone.From Devonian,the mantle began to rise and form a lifting zone.And a east-west extension with local volcanism took place in the Earth crust.From Carboniferous to Triassic,there were a great amount of volcanic eruptions mainly intermediate-acidic in it,which was closed in Early Jurassic and with a thick clastic sediment of Mesozoic and Cenozoic.And many large or medium ore deposits were developed with the formation of this fault depression zone.
出处
《云南地质》
2001年第1期39-45,共7页
Yunnan Geology
