琼州海峡裂谷成因的火山活动标志

根据雷琼地区存在大规模火山活动以及新生界明显地由断陷的南、北侧向海峡急剧增厚的事实，结合近年来海峡地区的物探成果，论证了琼州海峡的裂谷成因，是上地幔物质上涌的结果。该地区的高热流值、高地热增温率和强震活动都说明，琼州海峡是现今仍具有一定活动性的裂谷构造。

Volcanism marks for rift valley of Qiongzhou strait

Based on the large scale volcanism and the thickness of cenozoic group rapid increased from the north and south side of Leiqiong fault depression to the Qiongzhou strait,combining with the results of geophisical prospecting in strait areas,contributing factor for the rift valley of Qiongzhou strait is discussed,which can caused by the uprush of upper mantle materials.The high value of thermal current and the high geothermal gradient indicated that the Qiongzhou strait is an active rift stucture in recent year.