四川盆地北缘大巴山前陆构造中—新生代构造隆升史  

Mesozoic-Cenozoic Tectonic Uplift History of Dabashan Foreland Structure in the Northern Rim of Sichuan Basin

作　　者：张艳妮[1,2] 李荣西[1,2] 刘海青[1,2] 朱瑞静[1,2] 朱德明[1,2] 王宁[1,2] 赵帮胜 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054

出　　处：《地球科学与环境学报》2014年第1期230-238,共9页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(41173055);中国地质调查局地质大调查项目(1212011121117)

摘　　要：大巴山前陆构造的抬升剥蚀与保存条件对其矿床和油气藏勘探潜力评价极为重要。应用磷灰石裂变径迹热年代学方法，通过研究大巴山前陆构造热演化史，恢复构造隆升过程，确定其中-新生代构造抬升剥蚀量，探讨大巴山前陆晚期构造隆升对矿床和油气资源的影响。结果表明：大巴山前陆构造在152 Ma以前快速沉降，沉降速率平均高达150·Ma^-1，此后便长期处于隆升过程；136～152 Ma时期为快速隆升阶段，隆升速率平均为56．3 m·Ma^-1，隆升量约为900 m，是燕山运动导致秦岭造山期后的一次陆内挤压；70～136 Ma时期为较缓慢隆升阶段，隆升速率平均为39．4 m·Ma^-1，隆升量约为2600 m，是秦岭造山晚期挤压的结果；0～70 Ma时期的隆升速率为42．8 m·Ma^-1，持续时间较长，隆升幅度约3000 m，是喜马拉雅构造运动的结果。中生代构造隆升对本区低温热液矿体和油气保存极为不利；上新统以来（8 Ma或5 Ma），青藏高原快速隆升向东扩展的远程效应对大巴山前陆构造的影响不明显。The uplift-denudation and preservation condition in Dabashan foreland structure are very important to evaluate the exploration potential of deposit and hydrocarbon reservoirs.Based on the thermal chronology method of apatite fission-track,according to the thermal evolution history in Dabashan foreland structure,the tectonic uplift process was restored,the tectonic uplift-denudation in Mesozoic-Cenozoic was calculated,and the effects of late tectonic uplift of Dabashan foreland on deposit and hydrocarbon resources were discussed.The results show that Dabashan foreland structure subsides rapidly before 152 Ma with the average subsidence rate of 150 m·Ma^-1 ,and since then,the structure is still in uplift process;the structure uplifts rapidly in 136-152 Ma with the average uplift rate of 56.3 m·Ma^-1 ,and the amount of uplift is about＆amp;nbsp;900 m,so that it is a intracontinental extrusion after Qinling orogenic period caused by Yanshan movement;the structure uplifts slowly in 70-136 Ma with the average uplift rate of 39.4 m·Ma^-1 ,and the amount of uplift is about 2 600 m,so that it is caused by the extrusion in Qinling late-orogenic period;the structure uplifts continuously in 0-70 Ma with the uplift rate of 42.8 m·Ma^-1 ,and the amount of uplift is about 3 000 m,so that it is caused by the Qinling tectonic movement.Tectonic uplift in Mesozoic is unfavourable for epithermal deposit and hydrocarbon reservoir preservation in Dabashan foreland structure;the effect of rapid uplift with extension eastward in Tibetan Plateau on Dabashan foreland structure is not obvious since Pliocene （8 Ma or 5 Ma）.

关 键 词：构造隆升 热演化史 裂变径迹 沉降速率 隆升速率 大巴山前陆构造 四川盆地 

分 类 号：P542.1[天文地球—构造地质学]