广西涠洲岛南湾火山喷发特征

孙谦; 樊祺诚; 龙安明; 尹克坚

广西涠洲岛南湾火山喷发特征

1.
中国地震局地质研究所，北京 100029
2.
广西地震局，广西南宁 530022

基金项目:

国家自然科学基金项目 40402010

国家自然科学基金项目 40572044

地震科学联合基金项目 106046

详细信息

作者简介:
孙谦(1969-), 男, 副研究员, 主要从事新生代火山岩石学、地球化学和喷发动力学方面研究.E-mail: qiansunstr@sina.com

中图分类号: P588
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出版历程
- 收稿日期: 2005-12-03
- 刊出日期: 2006-01-25

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

摘要

摘要: 涠洲岛是北部湾内的一座火山岛, 火山熔岩构筑了该岛的基底, 岛南端的南湾火山喷发物形成了涠洲岛现代火山地貌.南湾火山喷发以岩浆喷发和射气岩浆喷发交替进行为特征, 火山碎屑岩和基浪堆积物向岛北延伸, 覆盖了大半个涠洲岛.选取了鳄鱼嘴和猪仔岛2个典型剖面, 对南湾火山喷发活动进行详细的观察和描述, 发现了诸如爬升层理、大型低角度交错层理和板状层理等射气岩浆喷发成因的基浪堆积物中特有的构造, 并且观察到射气岩浆作用的指相物质——增生火山砾.所有这些现象都反映了南湾火山是射气与岩浆交替喷发成因的复合火山, 其中射气岩浆喷发占据重要地位, 而喷发中心位于南湾海中.
- 涠洲岛 /
- 南湾火山 /
- 射气岩浆喷发 /
- 基浪堆积物 /
- 复合火山
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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图 1 涠洲岛地质简图

1.含生物碎屑中-细砂及海滩岩; 2.火山碎屑岩及基浪堆积; 3.球状风化玄武岩; 4.火山口; 5.城镇

Fig. 1. Sketch geological map of Weizhou island

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图 2 鳄鱼嘴南端(a)和猪仔岛(b)喷发物堆积剖面

Fig. 2. Profile of volcanic eruption in the south of Eyuzui and Zhuzidao

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图 3 基浪堆积物中的交错层理和波状层理

Fig. 3. Cross-bedding and slaty-bedding within base surge

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图 4 基浪堆积物中的增生火山砾

Fig. 4. Accretionary lappili within base surge

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图 5 军队靶场西侧基浪堆积及V形凹坑

Fig. 5. Base-surge and V-shape pit in the west of the army shooting range

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参考文献(16)

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