志留纪以来的云开地块

doi:10.7605/gdlxb.2001.03.003

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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.

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Published: 01 June 2001

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.

Cite this article:

. THE YUNKAI BLOCK SINCE SILURIAN[J]. JOURNAL OF PALAEOGEOGRAPHY, 2001, 3(3): 32-40.

. THE YUNKAI BLOCK SINCE SILURIAN[J]. JOPC, 2001, 3(3): 32-40.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2001.03.003 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2001/V3/I3/32

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