福建紫金山地区岩浆演化序列初探:锆石SIMS U-Pb年龄及Hf、O同位素证据

发布时间：2018-06-03 07:12

本文选题：SIMS锆石U-Pb年龄 + Hf-O同位素　；参考：《矿物岩石地球化学通报》2017年01期

【摘要】：通过对福建紫金山地区不同岩石样品中岩浆锆石的SIMS U-Pb年龄和Hf、O同位素研究,对该地区岩浆序列以及源区组成、壳幔相互作用等进行初步探讨。结果显示,岩石样品中岩浆锆石的年龄(151~1514 Ma)较为分散,包含了从中元古代、震旦纪、早古生代晚期、晚三叠世到晚侏罗世的5个不同岩浆侵入时期。锆石的二阶段Hf亏损地幔模式年龄(t_(DM2)值)主要分布在古元古代,ε_(Hf)(t)数据也显示主要沿基性地壳演化线分布,指示古元古代时期的新生基性地壳可能是研究区中元古代直至晚侏罗世侵入岩形成的主要源区。锆石δ~(18)O及ε_(Hf)(t)值显示中元古代及震旦纪岩浆作用是幔源岩浆与古元古代基性地壳共同作用的结果;早古生代晚期和晚三叠世岩浆作用以壳源为主;至晚侏罗世,亏损地幔物质对岩浆作用的影响增加。
[Abstract]:Based on the SIMS U-Pb age and HFO isotopic study of magmatic zircon from different rock samples in Zijinshan area Fujian Province the magmatic sequence source composition and crust-mantle interaction are preliminarily discussed. The results show that the magmatic zircon in the rock samples is relatively dispersed, including five different magmatic intrusions of the Middle Proterozoic, the Sinian, the late Paleozoic, and the late Triassic to the late Jurassic. The two-stage HF depletion mantle model age of zircon is mainly distributed in Paleoproterozoic, and 蔚 ~ (+) Hft2) data also show that the zircon mainly distributes along the basic crustal evolution line. It is suggested that the new basic crust during the Gu Yuan period may be the main source of the Mesoproterozoic to late Jurassic intrusive rocks in the study area. The zircon 未 ~ (18) O and 蔚 ~ (+) value indicate that the Mesoproterozoic and Sinian magmatism was the result of the interaction between the mantle magma and the Paleoproterozoic basic crust, the late Paleozoic and late Triassic magmatism was dominated by crust-origin, and the late Jurassic, the late Paleozoic, the late Paleozoic, The effect of depleted mantle material on magmatism increases.
【作者单位】：福州大学紫金矿业学院;
【基金】：国家自然科学基金项目(41173036) 福建省自然科学基金项目(2013J01160)
【分类号】：P597.3;P588.1

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