鄂尔多斯盆地东南缘金锁关地区延长组构造-热演化特征

发布时间：2018-01-25 07:11

本文关键词： 鄂尔多斯盆地东南缘金锁关地区构造变形热演化特征　出处：《地质科技情报》2017年03期 　论文类型：期刊论文

【摘要】：采用野外剖面勘测与磷灰石裂变径迹(AFT)分析相结合的研究方法,综合分析了鄂尔多斯盆地东南缘金锁关地区上三叠统延长组的中-新生代构造-热演化特征。金锁关-淌泥河剖面延长组总体呈现为褶皱-冲断构造变形样式,剖面北段的淌泥河处发育较为强烈的斜歪褶皱-冲断构造;该冲断构造属于瑶曲-云梦山冲断构造带的重要组成部分,且中侏罗统卷入了与延长组协同的褶皱变形,并与其上覆的下白垩统呈角度不整合接触关系,表明其构造变形时间主要发生在燕山中期的晚侏罗世。剖面上强、弱变形区段2件延长组砂岩样品的磷灰石裂变径迹(AFT)中值年龄和池年龄非常接近地分布在(105±7)Ma和(93±6)~(94±6)Ma,表明金锁关地区延长组抬升冷却至AFT封闭温度以浅的峰值年龄主要集中在100 Ma左右;砂岩样品AFT热史模拟结果进一步揭示,延长组最晚在早白垩世中期的120 Ma左右已达到最大埋深增温,之后经历了早白垩世晚期120~115 Ma的快速抬升、115~40 Ma的缓慢抬升和40~17 Ma以来的快速隆升剥露过程。
[Abstract]:The field section survey and apatite fission track (AFT) analysis method combined with the comprehensive analysis of the Erdos Basin Southeast Margin of jinsuoguan area three Triassic Yanchang Formation of Mesozoic Cenozoic tectonic thermal evolution of jinsuoguan. - Tang River section of Yanchang Formation mud generally presents foldingthrust tectonic deformation style, drip at the northern section of the river section developed strong inclined fold thrust structure; an important part of the thrust structure belongs to Yao Qu - Yunmeng Mountain Thrust Belt, and the Middle Jurassic in Yanchang Formation and deformation coordination of folds, and the overlying Lower Cretaceous is angular unconformity the contact relationship shows that the tectonic deformation mainly occurred in Yanshan in the middle Late Jurassic. Section 2 is strong, weak deformation section sandstone samples of the apatite fission track (AFT) median age and age distribution in the pool is very close (105 + 7) Ma and (93 + 6) ~ (94 + 6) Ma, showed that jinsuoguan in Yanchang Formation uplift cooling to AFT closure temperature with peak age mainly concentrated in the shallow sandstone samples of about 100 Ma; AFT simulation of thermal history results further revealed that the Yanchang Formation in the late Early Cretaceous 120 Ma the left and right has reached the maximum depth of warming, after the rapid uplift of the early Cretaceous 120~115 Ma, 115~40 Ma long fast slow uplift and 40~17 Ma since the rise of exhumation.

【作者单位】：西北大学大陆动力学国家重点实验室;西北大学地质学系;
【基金】：国家自然科学重点基金项目(41630312) 大陆动力学国家重点实验室科技部专项(BJ14252) 中国地质调查局油气资源调查专项(1212011220761-03)
【分类号】：P542
【正文快照】： 金锁关地区位于鄂尔多斯盆地南缘的渭北隆起东北部,区域上与秦岭造山带北缘的(华北)鄂尔多斯地块南缘构造带相邻[1-2],地处盆地稳定沉降区与其南缘冲断构造带之间的过渡转换区带。长期以来,已有诸多学者对渭北隆起南缘(外带)抬升-剥露区带的构造变形和热演化特征进行了较为深

【相似文献】