岩石矿物学杂志2018，Vol.37Issue(1)：87-98,12.
青藏高原北部发现印支运动的新证据——来自同构造花岗细晶岩脉的响应
New evidence of Indosinian movement in northern Tibetan Plateau: The response of the syntectonic granite aplite vein
摘要
Abstract
The row echelon granite aplite veined belt extending over one hundred kilometers are developed between the Kunlun Mountain Pass-Gander fault and the Bayan Haran central fault in northern Tibetan Plateau,and most of them are NW-trending,with a few being SN-trending.Based on an analysis of the macroscopic and microscopic characteristics of the row echelon granite aplite veins,as well as the LA-ICP-MS zircon U-Pb dating data for the SN-trending(224.7 ± 0.64 Ma) and NW-trending(220.5 ± 1.1 Ma) granite aplite veins,it is considered that the granite aplite veins are the products of Indosinian Movement,and they were formed in the oblique subduction of the Hoh Xil-Bayan Har terrane beneath the East Kunlun terrane in early Indosinian.The syntectonic granite aplite veins were injected along the "X" conjugate shear joints in the NW(118°) and the SN (2°) direction in the footwall (south section) of the Kunlun Mountain Pass-Gander overthrust fault.The principal compressive stress direction is revealed by the distribution direction of two groups of "X" type conjugate shear joints,which is NW(118°) to the SN(2°).The left order row echelon joints suggest that they are controlled by dextral strike-slip.The earliest formation time of granite aplite veins(224.7 ± 0.64 Ma)represents the time of subduction and strike-slip event,which is also the formation time of the Kunlun Mountain Pass-Gander fault.关键词
青藏高原北部/细晶花岗岩脉带/雁列/同构造/印支运动Key words
northern Tibetan Plateau/granite aplite veins/echelon joints/syntectonic/Indosinian Movement分类
天文与地球科学引用本文复制引用
白国典,何凯,王艳慧,琚根社,杜保峰,王坤..青藏高原北部发现印支运动的新证据——来自同构造花岗细晶岩脉的响应[J].岩石矿物学杂志,2018,37(1):87-98,12.基金项目
Project of China Geological Survey(12120113033018)中国地质调查局区域地质调查项目(12120113033018) （12120113033018）
