摘要
云南德钦及邻区晚三叠世火山沉积盆地的形成和演化与江达 -维西火山弧的演化密切相关 ,而后者的形成则受控于金沙江洋盆的俯冲消减作用。从现有的研究成果来看 ,德钦及邻区晚三叠世火山沉积盆地的属性存在较大的分歧。本文根据火山岩和沉积学等方面的信息 ,认为生达 -车所 -鲁麻盆地、徐中 -鲁春 -红坡和箐口塘 -催依比 -上兰盆地三个晚三叠世火山沉积盆地应属走滑拉张盆地 。
The formation and evolution of Deqin volcano sedimentary basin during the late Triassic is related to evolution of Jiangda Weixi volcanic arc which is formed by the process of the subduction consumption and the westward oblique collision of the Jinshajiang oceanic basin.The Jiangda Weixi volcanic arc appears as “subduction type” arc and characterized by arc type volcanic rocks in the late Early Permian and Late Permian(P 1 2 P 2).During the Early and Middle Triassic,the Jiangda Weixi volcanic arc “collision type” arc as result of collision between arc and continental block and characterized by the collision arc type volcanic rocks.The Chesuo Luma,Xuzhong Luchun Hongpo and Qingkoutang Cuiyibi Shanglan strike slipe pull apart basins were formed on the base of the Jiangda Weixi volcanic arc by the regional strike slip extensional process during the Late Triassic.The bimodal volcanic rocks,siliceous and volcano turbidites of deep water facies were developed in three strike slipe pull apart basins in this period.The spreading time,rate,width and length of the Chesuo Luma strike slipe pull apart basin were 11.6 Ma,0.27 cm/a,63 km and 138 km^239 km respectively,the Xuzhong Luchun Hongpo strike slipe pull apart basin were 16.1 Ma,0.43 cm/a,140 km and 308 km^532 km respectively and Qingkoutang Cuiyibi Shanglan strike slip pull apart basin were 16.1 Ma,0.36 cm/a,116 km and 255 km^440 km respectively.
出处
《矿物岩石》
CAS
CSCD
北大核心
2000年第3期23-28,共6页
Mineralogy and Petrology
基金
原地质矿产部青年地质学家基金!(编号 :Qn97980 8)
