中国南方早三叠世岩相古地理分异演化与板块运动的关系  

RELATIONSHIP BETWEEN THE DIFFERENTIATION OF LITHO-PALEOGEOGRAPHY AND THE MOVEMENT OF BLOCKS IN THE EARLY TRIASSIC IN SOUTH CHINA

作　　者：左景勋[1] 童金南[1] 赵来时[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地质科技情报》2003年第2期29-34,共6页Geological Science and Technology Information

基　　金：国家自然科学基金资助项目"中国南方下三叠统国际建阶层型研究"(40072011);国家"973"项目子课题"古生代-中生代之交生物大绝灭-复苏与环境控制因素"(G2000077705)

摘　　要：早三叠世中国南方的岩相古地理总体上表现为"两隆两凹"的格局,即西部以康滇古陆为核心的中、上扬子地块,东部以华夏古陆为核心的华夏地块,两地块之间为扬子古海洋。两古陆附近沉积滨浅海相碎屑岩,其间的古海洋内为碳酸盐岩台盆,岩相分带显著。中国南方早三叠世的岩相古地理取决于扬子板块与华夏板块的裂离和拼合。由Induan期到Olenekian期,中、下扬子地区的北部缓慢抬升,下扬子地区由较深水转化为局限碳酸盐岩台地。与此同时,西南部的康滇古陆下沉,东部的华夏古陆隆升,导致岩相向西推移,右江地区表现为活动性断陷盆地。Lithopaleogeography of South China during the Early Triassic is subject to the separation and collision between North China and South China blocks, and the relative movement of blocks. As a whole, the lithopaleogeography of South China takes on a pattern of 'two uplifts and two depressed areas', i.e., an old uplift named Kongdian in the west and the other named Huaxia in the east. Between the two uplifts there was a deep ocean. Littoral clastic rocks are deposited near the old uplifts and in the deep ocean are carbonate rocks with clear lithofacies zones. It is found that from Induan to Olenekian stage the northern part of the Middle and Upper Yangtz areas uplifted slowly while the Kongdian uplift depressed.At the same time Huaxia uplift rose quickly,resulting in the westward movement of the lithofacies.This is shown in the extensive rift and depression in the active Youjiang area and the change of the Lower Yangtz from deep shelf to restricted platform.

关 键 词：中国 早三叠世 岩相古地理 扬子板块 华夏板块 板块运动 沉积滨浅海相碎屑岩 

分 类 号：P586[天文地球—岩石学] P531[天文地球—地质学]