西沙海域上新世以来火山特征及其形成机制*

doi:10.11978/2016080

Abstract

Abstract:

Due to data sparsity, volcanic activity in the Xisha waters is poorly understood. Single channel seismic profiles are used to study the volcanoes’ structures and their formation mechanisms in this paper. Seismic profiles document 10 submarine volcanoes in the south XW. Inside the volcanoes, discontinuous but strong reflections are observed and interpreted as lava flows. In addition, seismic data show two isolated volcanoes intruding Quaternary strata in the western edge and middle XW, respectively. Stratigraphic contact relationship between the lava flows and surrounding sedimentary strata reveals that Pliocene and Quaternary are two main magmatic activity stages in the XW. We propose the formation mechanism of volcanoes in the XW be that upwelling mantle magma weakens mantle lithosphere, migrates along pre-existing fault, and then erupts to the palaeo-seabed.

Key words: Xisha waters, submarine volcano, Pliocene, formation mechanism, single channel seismic profile

Yingci FENG, Wenhuan ZHAN, Jie SUN, Yantao YAO, Lei GUO, Mei CHEN. The formation mechanism and characteristics of volcanoes in the Xisha waters since Pliocene[J].Journal of Tropical Oceanography, 2017, 36(3): 73-79.

Figures/Tables 4

References 33

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The formation mechanism and characteristics of volcanoes in the Xisha waters since Pliocene

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