PETRO-GEOCHEMISTRY AND GENESIS OF THE PUMICES AT DONGDAO OF XISHA ISLANDS

HAN Zongzhu; LV Yingqiu; XU Hong; LIU Ming; LAI Zhiqing

doi:10.16028/j.1009-2722.2017.06001

2017 Vol. 33, No. 6

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HAN Zongzhu, LV Yingqiu, XU Hong, LIU Ming, LAI Zhiqing. PETRO-GEOCHEMISTRY AND GENESIS OF THE PUMICES AT DONGDAO OF XISHA ISLANDS[J]. Marine Geology Frontiers, 2017, 33(6): 1-8. doi: 10.16028/j.1009-2722.2017.06001

Citation:

HAN Zongzhu, LV Yingqiu, XU Hong, LIU Ming, LAI Zhiqing. PETRO-GEOCHEMISTRY AND GENESIS OF THE PUMICES AT DONGDAO OF XISHA ISLANDS[J]. Marine Geology Frontiers, 2017, 33(6): 1-8. doi: 10.16028/j.1009-2722.2017.06001

PETRO-GEOCHEMISTRY AND GENESIS OF THE PUMICES AT DONGDAO OF XISHA ISLANDS

1.
The Key Laboratory of Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China
2.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
3.
Qingdao Institute of Marine Geology CGS, Qingdao 266071, China

Received Date: 30 March 2017

Publish Date: 28 June 2017

Abstract

Abstract

In this paper, two pumices samples collected from the Dongdao Island are studied for petrography and mineral geochemistry. With chemical composition, the samples are defined as trachyte, and their rare earth distribution curves are both dipping rightward, with negative Eu anomalies, enriched incompatible elements, and a trace element normalized curve similar to the lower crust. The porphyritic minerals of plagioclase and pyroxene show a central melting structure, and olivine is molten. It is believed that the pumices are formed by an explosion of a short-term condensed magma chamber after the melting and pressure reduction of the crust at the Xisha block, due to the continuous spreading of the plate and the formation of the narrow trough on the west side of the Dongdao Island. The process caused the sudden release of pressure, and rapid eruption of magma along the stretching rift into the shallow water.
- pumice /
- petro-geochemistry /
- magmatic activity /
- Dongdao

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References

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