江南—雪峰地区加里东期和印支期不整合分布规律  

The unconformable distribution of Caledonian and Indosinian strata in Jiangnan-Xuefeng area

作　　者：陈世悦[1] 李聪[2] 张鹏飞[3] 王岳军[4] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东青岛266555 [2]中国石化中原油田勘探开发研究院,河南濮阳457001 [3]中国石化股份胜利油田分公司地质科学研究院,山东东营257015 [4]中国科学院广州地球化学研究所,广东广州510640

出　　处：《中国地质》2011年第5期1212-1219,共8页Geology in China

基　　金：中石化重大前瞻性项目(YPH08004)资助

摘　　要：江南—雪峰造山带的构造性质长期以来存在争议。通过对江南—雪峰地区加里东期和印支期不整合面的野外勘查,发现加里东期不整合面空间展布和影响范围分别以安化—溆浦断裂和慈利—保靖—三都断裂为界,安化—溆浦—靖州断裂东南侧为加里东运动的强烈褶皱变形区;两断裂之间为弱变形区;慈利—保靖—三都以西广大区域以垂直抬升运动为特征,没有明显的加里东期褶皱运动。印支期不整合分布规律与加里东期有一定的继承性,其空间展布以蒲圻—慈利—保靖和咸宁—鹤峰—龙山两大断裂为界。蒲圻-慈利-保靖以东为印支运动的强烈褶皱变形区,咸宁—鹤峰—龙山断裂以西为平行不整合分布区。两断裂之间为微角度不整合分布区。从不整合面的分布特征推测印支运动的影响范围向西推进更远。研究表明江南—雪峰隆起区只处于加里东期和印支期两期陆内造山运动的西边缘,而不是其构造中心。The tectonic nature of Jiangnan-Xuefeng orogenic belt is a controversial issue which has aroused great attention among geologists in China.The nature of the Caledonian and Indosinian unconformity in Xuefeng region reflects the sphere of influence in the two stages of orogeny.Based on field geological survey,the authors have found that Jing＇an-Xupu-Jingzhou fault and Xiushui-Cili-Baojing-Sandu fault are boundaries of different types of unconformity and the limits of influence in Caledonian orogeny.On the southeast side of Jing＇an-Xupu-Jingzhou fault there is a strong fold deformation zone with well developed angular unconformity.In the vast area on the west side of Xiushui-Cili-Baojing-Sandu fault there is no obvious fold deformation,but vertical uplift is well developed,correspondingly forming parallel unconformity.The area between the two faults is a weak fold deformation zone with well developed slightly angular unconformity.The distribution of different types of unconformity in Indosinian period,which is bounded by Puqi-Cili-Baojing fault and Xianning-Hefeng-Longshan fault,has certain continuity relationship with the dsitribution of the Caledonian orogeny.In Indosinian movement,the area on the east side of Puqi-Cili-Baojing fault was a strong fold deformation zone,with well developed angular unconformity,whereas parallel unconformity was well developed on the west side of Xianning-Hefeng-Longshan fault.Between the two major faults there is slightly angular unconformity.From the distribution of different types of unconformity in Caledonian and Indosinian orogeny,it can be concluded that the influence range in Indosinian movement advanced more westward than that in Caledonian orogeny,and the Xuefeng uplift area was only on the western edge of the two stages of intracontinental orogeny,rather than acted as the structural center.

关 键 词：加里东运动 印支运动 不整合面 江南—雪峰地区 

分 类 号：P618.13[天文地球—矿床学]