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内蒙古达茂旗满都拉地区早二叠世基性岩的年代学、地球化学及其地质意义

, PP. 343-358

Keywords: 满都拉,锆石SHRIMPU-Pb年龄,二叠纪,地球化学分析,拉张作用

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Abstract:

?内蒙古达茂旗满都拉地区胡吉尔特-查干哈达庙一带出露一套基性岩系,主要为基性喷出岩,其间出露条带状超基性岩,同时在基性熔岩的东部伴生有一系列中基性侵入岩体.其中辉长岩和玄武岩样品的锆石SHRIMPU-Pb年龄分别为(278.5±3.0)Ma(MSWD=0.66)和(273.7±1.0)Ma(MSWD=0.36),表明这套基性岩形成于早二叠世.地球化学分析表明,满都拉地区二叠纪基性岩稀土元素丰度较低,具有LREE轻度亏损、HREE轻度富集的与N-MORB相似的稀土元素分布特征;基性熔岩具有高的(143Nd/144Nd)i值(0.51262~0.51270)、较高的正εNd(t)值(3.4~8.0)和Mg#值(49~54),指示了其来源是亏损的软流圈地幔;相对富集Rb,Ba和Sr等大离子亲石元素(LILE),亏损高场强元素(HFSE),Nb和Ta具有明显的负异常,P和Ti有微弱的负异常,较高(87Sr/86Sr)i值(0.70490~0.70537)、较低(206Pb/204Pb)i值(17.39~17.93)等富集地幔或者岛弧火山岩的地球化学信息共同显示出源区的复杂性.结合La/Nb比值、Nd-Sr同位素初始比值图解、Pb同位素初始比值图解、La/Ba-La/Nb图解等认为岩浆源区可能受到了与俯冲消减有关的混染和交代作用.同时样品中较大的同位素组成及元素比值变化范围说明岩浆在上升侵位过程中可能受到了不同程度的陆壳/弧物质的混染.综合研究区基性岩地球化学特征和前人资料表明,满都拉地区的二叠纪基性岩形成于强烈裂谷作用背景,当时区域上可能存在类似于现今红海的有限洋盆.

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