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地质学报  2007 

海南岛变碎屑沉积岩锆石SHRIMPU-Pb年龄及地质意义

, PP. 381-393

Keywords: SHRIMP,锆石U-Pb年龄,源区,变火山-碎屑沉积岩,格林威尔造山事件海南岛

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Abstract:

CL成像制约下的锆石SHRIMPU-Pb定年结果表明,海南岛北西部中新元古代石碌群的源区岩可能主要为同区的古中元古代抱板群和中元古代花岗质岩,推测其沉积上限约960Ma、下限约1300Ma;而岛中东部早古生代变沉积岩物源较为复杂,可能与新太古宙―古元古代或更老的洋壳基底、同期的基性火成岩及岛北西部的抱板群和中元古代花岗质岩有关,推测其沉积上限约470Ma、下限约514Ma或稍早。锆石SHRIMP年龄谱及Nd模式年龄,虽揭示海南岛东南部与北西部可能具不同的地壳增长历史,但两者约在1000~1200Ma同时经历格林威尔造山事件,并组成Rodinia超大陆一部分。由于晚元古代-寒武纪洋内弧残余在岛中东部可能出现,并于440~509Ma普遍经历一次变质事件,而岛北西则出现中元古代花岗质岩,因而我们认为Rodinia超大陆聚合前,海南岛北西部最可能是劳伧大陆南缘西延部分,而岛东南部更可能位于澳大利亚大陆东部边缘。研究结果还暗示,中新元古代石碌群可能产于陆-陆碰撞有关的前陆盆地,而早古生代火山-碎屑沉积岩可能产于洋内弧相关的环境,因而晚前寒武纪以来海南岛大地构造环境具有由被动大陆边缘经裂谷向活动大陆边缘演化的特点。

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