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古地理学报 ›› 2001, Vol. 3 ›› Issue (3): 32-40. doi: 10.7605/gdlxb.2001.03.003

• 构造古地理学及古构造 • 上一篇    下一篇

志留纪以来的云开地块

吴浩若   邝国敦   王忠诚   

  1. 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
  • 出版日期:2001-06-01 发布日期:2001-06-01
  • 作者简介:吴浩若，男，1940年生，1962年毕业于北京地质学院，1966年中科院地质研究所研究生毕业。现为中科院地质与地球物理所研究员，主要从事古生物学和构造地层学研究。

THE YUNKAI BLOCK SINCE SILURIAN

Wu Haoruo  Kuang Guodun  Wang Zhongcheng   

  1. ①Institute of Geology and Geophysics, Beijing 100029; ②Guangxi Institute of Geology, Nanning 530023
  • Online:2001-06-01 Published:2001-06-01
  • About author:Wu Haoruo, born in 1940, graduated from the Beijing College of Geology in 1962. Now he is a professor of the Institute of Geology and Geophysics, Chinese Academy of Sciences, and engages in paleontology and stratigraphy.

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。

Abstract:

The Yunkai Block, extended in southern Guangxi and westerm 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. However, the Paleozoic sedimentary cover is widely distributed, even across the Beibu Gulf. The paleozoic 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 the Pearl River Delta on the east. In the most time of Late Paleozoic, 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 Paleo-Tethys in western Guangxi 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 Paleo-Tethys. Before the opening of the South China Sea at the early Cenozoic, the Nansha Block to the north of the Palaeo-South China Sea might connect with the Yunkai Block. Its total area may exceed 500,000 km2 and play an important role in the geological evolution of the Southeast Asia.