扬子板块北缘中段多期褶皱构造的变形特征及叠加关系  

Structural Style and Superposed Relationship of Multi-period Folds in the Middle Segment of Northern Yangtze Block

作　　者：王凯[1,2,3] 刘少峰[3] 姜承鑫[3] 王平[4] 张岩[5] 孟勇[1,2] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]中国地质调查局造山带地质研究中心,陕西西安710054 [3]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [4]南京师范大学地理科学学院,江苏南京210046 [5]国土资源部金矿成矿过程与资源利用重点实验室,山东济南250013

出　　处：《大地构造与成矿学》2015年第2期231-240,共10页Geotectonica et Metallogenia

基　　金：国家自然科学基金重点项目(批准号:41030318);中国石油化工股份有限公司前瞻性研究项目(编号:YPH08009);陕西山阳–柞水矿集区1/5万矿产分布及成矿规律图编制专题项目(编号:2011BAB04B05)

摘　　要：扬子板块北缘在中生代期间经历多期构造变形,早期形成的构造样式多被后期的构造变形改造破坏,仅在大巴山弧形断裂和大洪山弧形带之间的南漳一带较好地保存了早期的构造变形样式。笔者通过对当阳复向斜北段发育的褶皱构造的构造要素测量统计和褶皱叠加关系的解析,在扬子板块北缘中段南漳一带识别出三期走向不同的褶皱叠加构造,按发育早晚顺序分别为NW-SE走向褶皱、NE-SW走向褶皱和近EW走向褶皱,分别对应扬子板块向北俯冲以及后期转入陆内变形、江南–雪峰褶皱逆冲带向NW逆冲推覆和晚侏罗世到早白垩世期间大巴山向SW推进等构造变形过程。The northern Yangtze Block went through many periods of deformation, within which the early-period structural styles were destroyed and replaced by later ones. Fortunately, records of the early-period deformation styles are reserved in the Nanzhang area, which is tectonically located between the two arc-shaped fault-belts in the northern Yangtze Block：Daba Shan and Dahong Shan. Three phases of folding were recognized in the Dayang synclinorium area, namely the first stage NW-SE trending folds, second stage NE-SW trending folds, and the third stage E-W trending folds. The three phases of folding correspond to the tectonic deformations such as the northward subduction of the Yangtze Block with later intra-continental deformation, the northwest-ward thrusts of the Jiangnan-Xuefeng fold blets and the southwest-ward propagation of Daba Shan fault belts during the late Jurassic to early Cretaceous, respectively.

关 键 词：叠加褶皱 扬子板块北缘 前陆褶皱逆冲带 

分 类 号：P542[天文地球—构造地质学]