文献类型：期刊文献

中文题名：黔西南地区中?新生代构造变形特征及应力场模拟分析

英文题名：Characteristics of Meso-Cenozoic Tectonic Deformation and Simulation of Stress Field in Southwest Guizhou Province

作者：陈友智 杨贵来 唐永

第一作者：陈友智

通信作者：Tang, Yong

机构：[1]贵州理工学院资源与环境工程学院,贵州贵阳550003;[2]中国地质调查局成都地质调查中心,四川成都610000;[3]长江大学非常规油气湖北省协同创新中心,湖北武汉430100

第一机构：贵州理工学院资源与环境工程学院

年份：2021

卷号：45

期号：4

起止页码：667-680

中文期刊名：大地构造与成矿学

外文期刊名：Geotectonica et Metallogenia

收录：CSTPCD;;EI(收录号：20213510833892);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：贵州省科技计划项目(黔科合基础[2018]1065);黔西南州科技计划课题(2018QXN79225);贵州省重点学科项目(ZDXK[2018]001);湖北省教育厅计划项目(T201905)联合资助。

语种：中文

中文关键词：黔西南;中?新生代;构造变形;有限元;金矿床

外文关键词：Southwest Guizhou;Meso-Cenozoic;structural deformation;finite element;gold deposit

摘要：黔西南地区位于扬子克拉通西南缘,是世界著名的卡林型金矿集中区,中?新生代受特提斯域构造域和滨太平洋域构造域叠加复合影响,区域构造变形过程不清,控矿机理不明。针对这些问题,本文对区内构造裂缝的几何形态、主要构造期次及应力状态进行了分析,并运用Abaqus有限元软件模拟了各构造期应力与应变分布。研究获得下列认识:(1)晚三叠世?早白垩世:受古特提斯构造域与早燕山运动的影响,最大主应力优势方向为NE-SW,应力强度西强东弱,形成NW向构造,先存的NE向断层多表现为走滑性质,为成矿构造的主要形成时期;(2)古新世:受晚燕山运动的影响,最大主应力优势方向为NNW-SSE,形成新的NE向构造,构造变形强度较大,对早期形成的金矿床有较强的改造作用;(3)始新世:受太平洋板块向亚洲大陆俯冲的影响,最大主应力优势方向为近东西向,应力强度东强西弱,该期构造对金矿床改造较弱;(4)基于上述研究预测,隐伏金矿床存在于青山变形区中部、兴仁?贞丰变形区北部及南部东侧。联合野外地质调查及Abaqus有限元模拟,开展复杂构造区构造演化与金属矿床形成关系研究,为卡林型金矿勘探提供依据,并为隐伏矿床预测提供新方法。
Southwest Guizhou,located in the southwest of the Yangtze craton,is a famous Carlin-type gold province.Being controlled by both Tethys and Pacific tectonic domains,this district featured complex tectonic characteristics,and the relationship between the tectonic evolution and gold mineralization is actively disputed.To delineate the relationship between the tectonics and gold deposits,the geometry of structural fractures,and stresses of the main tectonic periods are analyzed.In addition,the stress and strain characteristics in each tectonic period are simulated by the Abaqus finite element software.We gained the following results:(1)Under the control of the Paleotethys domain and early Yanshan movement,the principal stress was NE-SW direction during Late Triassic-Early Cretaceous with a eastward decline in strength,which resulted in a series of NW structures,whereas the pre-existing NE faults exhibit strike slipping features.The structures formed in this stage are the main ore-bearing structures;(2)Due to the late Yanshan movement,the principal stress direction changed to NNW-SSE during Paleocene,and the newly formed NE structures deformed the previously formed gold deposits;(3)The subduction of the Pacific plate beneath the Asian continent in Eocene triggered the principal stress of W-E direction,its strength declines from east to west.The relatively weak deformation has little effect on these gold deposits;(4)Based on these understanding,areas like the middle of the Qingshan area and both north and southeast of the Xingren-Zhenfeng areas were suggested for future gold prospecting.In summary,the combined field geological survey and Abaqus finite element simulation demonstrate that the gold mineralization is closed related to the tectonic evolution,and can be used as a new method for the gold prospecting especially for the Carlin-type gold deposit.