| 志留纪以来的云开地块 |
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| 引用本文： | 吴浩若,邝国敦,王忠诚.志留纪以来的云开地块[J].古地理学报,2001,3(3):32-40. |
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| 作者姓名： | 吴浩若 邝国敦 王忠诚 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所，北京 100029；
2广西地质调查研究院，南宁 530023 |
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| 基金项目： | 国家自然科学基金 (批准号 :496 72 0 91和 49910 5 41748)资助项目 |
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| 摘 要： | 桂南－粤西的云开地块，位于特提斯构造带和环太平洋构造带的交汇处。其变质基底仅出露于两广边境的云开大山地区，但古生代海相沉积盖层分布广泛，甚至跨越北部湾。地块北缘的古生代深水沉积带，也延展到越南东北沿海地区。云开地块的范围，可能西起红河三角洲，东达珠江三角洲。晚古生代时，它可能为地处南纬低纬度海域的碳酸盐台地。古南海于中晚二叠世开始张开，使云开地块北移，与大明山地体碰撞，形成云开北缘的造山带。中晚三叠世，古南海的进一步扩张和桂西－越北的古特提斯向南消减，又形成晚二叠世造山带以北的印支期岩浆弧和磨拉石。也是东古特提斯闭合过程的重要部分。新生代早期南海张开前，古南海北侧的南沙地块可能和云开地块相接，总面积可能超过50万km2，在东南亚地质演化中起重要作用。
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| 关 键 词： | 志留纪 云开地块 华南 越南 古特提斯 古地理 构造演化 |
| 文章编号： | 1671-1505(2001)03-0032-9 |
| 修稿时间： | 2001年1月10日 |
THE YUNKAI BLOCK SINCE SILURIAN |
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| Wu Haoruo,Kuang Guodun,Wang Zhongcheng.THE YUNKAI BLOCK SINCE SILURIAN[J].Journal of Palaeogeography,2001,3(3):32-40. |
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| Authors: | Wu Haoruo Kuang Guodun Wang Zhongcheng |
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| Institution: | 1.Institute of Geology and Geophysics, Beijing 100029;2.Guangxi Institute of Geology, Nanning 530023 |
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| Abstract: | The Yunkai Block, extended in southern Guangxi and western Guangdong, is located in the intersection area of the Tethyan and the circum Pacific tectonic zones. Its metamorphic basement only crops out in the Yunkaidashan area on the border between Guangxi and Guangdong Provinces. However, the Palaeozoic sedimentary cover is widely distributed, even across the Beibu Gulf. The palaeozoic deep water sedimentary belt along the northern margin of the Yunkai Block also extends to the northeastern coast area of Vietnam. The scope of the Yunkai Block possibly reaches to the Red River Delta on the west,and to the Pearl River Delta on the east. In the most time of Late Palaeozoic, it was a carbonate platform placed in low north latitudes. The opening of the Palaeo South China Sea in late Permian might cause the collision between the Yunkai Block and the Damingshan Terrane. Then an orogenic belt formed along the northern margin of the Yunkai Block. During the later Triassic time, the further spreading of the Palaeo South China Sea and the southward subduction of the Palaeo Tethys in western Guangxi Province of China and northern Vietnam led to the forming of a Indosinian magmatic arc with a molasse belt on the north of the Permian orogenic belt. This was also an important part of the closure process of the east Palaeo Tethys. Before the opening of the South China Sea in the early Cenozoic, the Nansha Block in the north of the Palaeo South China Sea might connect with the Yunkai Block. The total area of Nansha Block may exceed 500 000 km 2,and it plays an important role in the geological evolution of the Southeast Asia. |
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| Keywords: | Yunkai Block South China Vietnam Palaeo Tethys Palaeo South China Sea paleogeography tectonic evolution |
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