海南岛前寒武纪基底组成及演化

龙文国; 丁式江; 马大铨; 林义华; 莫位明; 周进波

海南岛前寒武纪基底组成及演化

1.
海南省地质调查院, 海南海口 570226
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
宜昌地质矿产研究所, 湖北宜昌 443003

基金项目:

中国地调局1∶25万琼海县幅区域地质调查项目 200113000041

海南省自然科学基金项目 40401

详细信息

作者简介:
龙文国(1967-), 男, 副研究员, 主要从事地层古生物学研究.E-mail: hngeo@public.hk.hi.cn

中图分类号: P542
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出版历程
- 收稿日期: 2004-12-29
- 刊出日期: 2005-07-25

Formation and Evolution of the Precambrian Basement in Hainan Island

1.
Hainan Geology Survey, Haikou 570226, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Yichang Institute of Geology and Mineral Resources, Yichang 443003, China

摘要

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.
- 前寒武纪 /
- 构造格局 /
- 演化 /
- 海南岛
Abstract: Hainan island is located at the connection place of Eurasia, India and Pacific plates, tie 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.
- Precambrian /
- tectonic framework /
- evolution /
- Hainan island

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图 1 海南岛前寒武系分布

1.中元古代抱板群和花岗岩类(未分); 2.新元古代石碌群; 3.构造(断裂) 带

Fig. 1. Distribution of the Precambrian in Hainan island

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图 2 花岗岩Rb- (Y+Nb) 图解

Fig. 2. Rb- (Y+Nb) diagram of granites

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图 3 花岗岩Nb-Y图解

Fig. 3. Nb-Y diagram of granites

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图 4 抱板地区元古宙洋脊花岗岩稀土元素模式

Fig. 4. REE distribution patterns of the Proterozoic granites in Baoban, Hainan

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图 5 斜长角闪岩AFM图解

1.冰岛类型; 2.造山带; 3.大洋中脊; 4.大洋岛; 5.大陆裂谷

Fig. 5. AFM diagram of the amphibolites

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图 6 斜长角闪岩Zr/Y-Zr图解分析

Fig. 6. Zr/Y-Zr diagram of the amphibolites

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图 7 东方抱板斜长角闪岩与抱板群片麻岩接触关系

1.斜长角闪岩; 2.抱板群片麻岩

Fig. 7. Sketch map showing amphibolite intruding into the gneisses of Baoban Group in Dongfang

下载: 全尺寸图片幻灯片

表 1 海南岛中元古代构造演化事件的同位素年龄记录

Table 1. Isotopic dating of the Mesoproterozoic tectonic events in Hainan island

表 2 海南岛前寒武系基底中火成岩类元素分析结果

Table 2. Analytical results of elements in the Precambrian basement igneous rocks in Hainan island

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