CAJ | 학술논문

通过对上三叠统马鞍塘组及其生物礁的分布特征、岩相特征、古生物特征和物源区等的研究,认为上三叠统海相碳酸盐岩-碎屑岩的转换过程约束了马鞍塘组生物礁的发育范围和绝灭时间.川西海相碎屑岩物源主要来自北面的秦岭地区,在时间上从卡尼期开始到结束经历从无到有,从少到多的碎屑注入过程,在空间上经历了从北向南的扩展过程.揭示出龙门山造山带的形成与崛起具有从北到南的递进过程,并受控于秦岭造山带的形成和演化.这个转变过程是四川叠合盆地构造演化的一个关键点,它约束了马鞍塘组海相烃源岩的发育和生物礁发育序列.近川中地区地腹中可能有马鞍塘组高能礁体发育,值得油气勘探关注.
통과대상삼첩통마안당조급기생물초적분포특정、암상특정、고생물특정화물원구등적연구,인위상삼첩통해상탄산염암-쇄설암적전환과정약속료마안당조생물초적발육범위화절멸시간.천서해상쇄설암물원주요래자북면적진령지구,재시간상종잡니기개시도결속경력종무도유,종소도다적쇄설주입과정,재공간상경력료종북향남적확전과정.게시출룡문산조산대적형성여굴기구유종북도남적체진과정,병수공우진령조산대적형성화연화.저개전변과정시사천첩합분지구조연화적일개관건점,타약속료마안당조해상경원암적발육화생물초발육서렬.근천중지구지복중가능유마안당조고능초체발육,치득유기감탐관주.
Based on study of the features of distribution,lithofacies and palaeontology of the Upper Triassic Maantang Fm.and its bioherm as well as their provenience,this paper suggests that the distribution area and extinction of the bioherms in the Maantang Fm.be controlled by the Late Triassic transition from marine carbonates to marine clastics.The clastics of the marine strata in western Sichuan Basin were mainly sourced from the northern Qinlin area.The clastic input beginning in the Carnian increased in amount progressively and spread from north to south.It is indicated that the formation and uplifting of Longmen Mountain is a progressive process from north to south and is controlled by the formation and evolution of Qinling orogenic zone.The transition is critical to the structural evolution of the superimposed Sichuan Basin and constrained the development of marine source rocks in the Maantang Fm and the development sequence of the bioherms.The Maantang Fm is worthy of further exploration as high energy reefs might have developed in areas near the central Sichuan Basin.