海南岛前寒武纪基底组成及演化  

Formation and Evolution of the Precambrian Basement in Hainan Island

作　　者：龙文国[1] 丁式江[1] 马大铨[2] 林义华[1] 莫位明[1] 周进波[1] 

机构地区：[1]海南省地质调查院 [2]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《地球科学（中国地质大学学报）》2005年第4期421-429,共9页Earth Science-Journal of China University of Geosciences

基　　金：中国地调局1:25万琼海县幅区域地质调查项目(No.200113000041);海南省自然科学基金项目(No.40401).

摘　　要：海南岛位于欧亚板块、印度板块和太平洋板块的交接部位,区内构造复杂.根据沉积地层学、岩石学、岩石地球化学、同位素年代学等研究成果综合分析,海南岛存在元古代的古老变质基底,以九所-陵水断裂为界,可进一步划分为南部的三亚块体和中北部的五指山块体.二者的基底组成及特征明显不同,三亚块体的基底属南海-印支地块的一部分.五指山块体在早元古代末期地壳初步固结,形成古陆的雏形;中元古代大规模构造热事件(1.63Ga、1.4Ga)形成了海南岛中北部地区成型的、稳定的结晶基底;晚元古代(0.95Ga)构造活动相对和缓,已固结成型的古陆局部增生.此间深大断裂即开始活动并控制前寒纪基底构造格局和演化,五指山块体的空间范围几乎遍及整个海南岛中北部地区.Hainan island is located at the connection place of Eurasia, India and Pacific plates, the structure in the area is complex. An integrated analysis of stratigraphy, isotope dating and petrochemistry indicates that a Proterozoic metamorphic basement exists in Hainan island. It is divided into the southern Sanya terrain and the central-northern Wuzhishan terrain by the Jiusuo-Lingshui fault. The terrains have different basements in composition and characteristics. The Sanya terrain might be part of the South China Sea-Idochina terrain. An embryonic Wuzhishan terrain originated in the Early Proterozoic, and tectonic activity became relatively strong so that the old-land formed a stable, finished metamorphic basement in the Middle Proterozoic until it became weak in the Late Proterozoic. Active deep faults controlled the tectonic framework and evolution of the basement. The Wuzhishan terrain covers nearly all the central-northern Hainan island.

关 键 词：前寒武纪 构造格局 演化 海南岛 

分 类 号：P54[天文地球—构造地质学]