华南中生代岩相变化及海相地层时空分布  

DISTRIBUTIONS OF MESOZOIC LITHOFACIES AND MARINE STRATA IN SOUTH CHINA

作　　者：陈汉宗[1] 孙珍[1] 周蒂[1] 

机构地区：[1]中国科学院南海海洋研究所,广东广州510301

出　　处：《热带海洋学报》2003年第2期74-82,共9页Journal of Tropical Oceanography

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 4 67 -0 2 );中国科学院知识创新工程项目 (KZCX2 - 2 0 9- 0 5);中国海洋石油研究中心项目 (2 0 0 1- SW -0 0 4 );中国科学院重要方向项目 (KZCX2 - SW 117)

摘　　要：在搜集大量资料的基础上 ,分析了华南中生代地层时代、岩性、岩相对比关系 ,重点综述了中生代海相地层的时空分布特征。受所处构造部位的控制 ,华南中生代岩相时空变化总体上可分为 3个区 :东区 (闽西南—粤东—粤北—粤中 )、中区 (粤西—桂东 )、西区 (滇西—滇东南 )。中区在早三叠世以后完全隆升成陆 ,仅局部有山间盆地碎屑沉积。海相地层集中于东西两区 ,但存在明显的东西差异 :海侵时间在东区为早三叠世、晚三叠世—早侏罗世和早白垩世 ,西区为中三叠世和中侏罗世 ;海侵方向在东区来自东南 ,西区则为中特提斯滇缅海的一部分。晚三叠世—早侏罗世的粤东海盆发育厚达 5 0 0 0m的海相和海陆交互相沉积 ,可能向南延伸到台西南盆地和南沙群岛东部 ,但它与南海西部围区的同时代海盆并不直接相通。Mesozoic strata developed comparatively completely in South China, but varied significantly in lithology, lithofacies, and thickness due to different tectonic settings. In general, South China may be divided into three regions of different lithofacies evolution, namely the Eastern Region (southwestern Fujian eastern and central Guangdong), the Central Region (western Guangdong eastern Guangxi), and the Western Region (southeastern and western Yunnan). The Central Region remained as a land mass since Middle Triassic and accepted only continental deposits in discrete inter-mountain basins. Marine strata developed extensively in both the Eastern and Western regions but varied significantly in their evolutional history. Marine transgression occurred in the Eastern Region in 3 periods, Early Triassic, Later Triassic to Early Jurassic, and Early Cretaceous; while in the Western Region in 2 periods, Middle Triassic and Middle Jurassic. The transgressing seawater was from southeast for the Eastern Region, while the Western Region was a segment of the Yunnan-Burma Sea. The Eastern Guangdong Sea Basin in Late Triassic Early Jurassic accepted up to 5 000 m marine and intercalated marine-continental sediments. This sea basin might extend southward to the southwestern Taiwan Basin as well as to the eastern Nansha Island sea area,but it was not connected with the Early Jurassic sea basins of the southern Indochina Peninsular.

关 键 词：中生代 海相地层 岩相变化 时空分布 海盆 早三叠世 早侏罗世白垩世 

分 类 号：P534.5[天文地球—古生物学与地层学]