西沙区
西沙区-
西沙海槽区表层沉积物具有SiO2、TiO2含量低和CaO含量高的特征；
The surface sediments in the Xisha Trough show relatively low contents of SiO_2and TiO_2 and high content of CaO .
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西沙珊瑚礁区的第四纪事件
Quaternary events in Xisha coral reef region
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西沙海槽区作为气水合物的可能聚集地越来越受到关注。
Xisha Trough attracts more and more attention of scientists because of its great potential for gas hydrate .
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西沙海域东部岛礁区前寒武纪基底之上地层全部是较纯净的礁相碳酸盐岩，厚度达1250m，未被陆源碎屑岩覆盖；
All basement rocks in eastern reef island area is covered with pure reef facies carbonate rocks in the thickness of 1250m .
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西沙海槽研究区天然气水合物地球化学勘探及成藏模式研究
A study of gas hydrate geochemical exploration and deposit formation patterns in the Xisha ocean