Structural geology and favorable exploration prospect belts in northwestern Sichuan Basin, SW China

CHEN Zhuxin,LI Wei,WANG Lining,LEI Yongliang,YANG Guang,ZHANG Benjian,YIN Hong,YUAN Baoguo

Fig. 1. Location of the study area (a) and simplified geological map (b). Fq—Qingchuan strike-slip fault; Fb—Beichuan thrust fault; Fm—Majiaoba thrust fault; F1—Blind thrust fault (No. 1 fault); Ⅰ—Allochthonous nappe structural unit (Ⅰ1—Jiaoziding nappe; Ⅰ2—Tangwangzhai nappe); Ⅱ—Autochthonous thrust-nappe structural unit; Ⅲ—Autochthonous fold-thrust structural unit; ①—Zhongba anticline; ②—Haitangpu anticline; ③—Shuangyushi anticline; ④—Tianjingshan anticline; ⑤—Kuangshanliang anticline; ⑥—Shejianghe anticline; ⑦—Hewanchang anticline; ⑧—Tongziguan structure; ⑨—Dalianghui anticline; ⑩—Wujiaba structure; ?—Jiulongshan anticline; ?—Fuyangchang anticline; ?—Cangxi syncline; ?—Zitong syncline; ?—Tangwangzhai-Yangtianwo syncline; ?—Jiaoziding anticline; ?—Yanzixia anticline; Pt—Proterozoic; Z—Sinian; Pz—Paleozoic; —C—Cambrian; O—Ordovician; S—Silurian; D—Devonian; C—Carboniferous; P—Permian; T—Triassic; J—Jurassic; K1—Lower Cretaceous; Q—Quaternary.