广西涠洲岛南湾火山喷发特征

孙谦; 樊祺诚; 龙安明; 尹克坚

Volume 31 Issue 1

Jan. 2006

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SUN Qian, FAN Qi-cheng, LONG An-ming, YIN Ke-jian, 2006. Nanwan Volcano Eruption Features on Weizhou Island, Guangxi. Earth Science, 31(1): 66-70.

Citation:

SUN Qian, FAN Qi-cheng, LONG An-ming, YIN Ke-jian, 2006. Nanwan Volcano Eruption Features on Weizhou Island, Guangxi. Earth Science, 31(1): 66-70.

SUN Qian, FAN Qi-cheng, LONG An-ming, YIN Ke-jian, 2006. Nanwan Volcano Eruption Features on Weizhou Island, Guangxi. Earth Science, 31(1): 66-70.

Citation:

SUN Qian, FAN Qi-cheng, LONG An-ming, YIN Ke-jian, 2006. Nanwan Volcano Eruption Features on Weizhou Island, Guangxi. Earth Science, 31(1): 66-70.

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Nanwan Volcano Eruption Features on Weizhou Island, Guangxi

1.
Institute of Geology, China Seismological Bureau, Beijing 100029, China
2.
Guangxi Seismological Bureau, Nanning 530022, China

Received Date: 2005-12-03
Publish Date: 2006-01-25

Abstract

Abstract

Weizhou island is a volcanic island, which is located in Beibu Bay. The base of Weizhou island is constituted by lava. The Nanwan volcano effusive mass forms modern volcanic physiognomy of Weizhou island. Pycroclastics and base surge extend to the north island, covering more than half of the island. Eyuzui and Zhuzidao are two typical sections, which are selected in order to observe and describe the volcanic activity of Nanwan volcano in detail. Special structures were found that belong to the base surge, including large-scale and low-angle cross-bedding, slaty-bedding, climb-bedding, and distal facies accretionary lappili. These structures prove that Nanwan volcano is a multiplex volcano caused by alternation of magma eruption and phreatomagmatic eruption. Phreatomagmatic eruption plays an important role in the formation of Nanwan volcano. The eruptive center is located in the Nanwan sea.
- Weizhou island,
- Nanwan volcano,
- phreatomagmatic eruption,
- base surge,
- multiplex volcano

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References

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