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    冯艳芳, 邓晋福, 王世进, 肖庆辉, 陆松年, 刘翠, 崔显岳, 公凡影, 甄世民, 贾德龙, 齐钒宇. 鲁西地区早前寒武纪花岗岩类中镁安山质岩石系列（MA）的识别及大陆地壳生长[J]. 中国地质, 2010, 37(4): 1119-1129.
    引用本文: 冯艳芳, 邓晋福, 王世进, 肖庆辉, 陆松年, 刘翠, 崔显岳, 公凡影, 甄世民, 贾德龙, 齐钒宇. 鲁西地区早前寒武纪花岗岩类中镁安山质岩石系列（MA）的识别及大陆地壳生长[J]. 中国地质, 2010, 37(4): 1119-1129.
    shu
    FENG Yan-fang, DENG Jin-fu, WANG Shi-jin, XIAO Qing-hui, LU Song-nian, LIU Cui, CUI Xian-yue, GONG Fan-ying, ZHEN Shi-min, JIA De-long, QI Fan-yu. The recognition of the magnesian andesitic series（MA）in the Precambrian granitic rocks in western Shandong Province and the continental crustal growth[J]. GEOLOGY IN CHINA, 2010, 37(4): 1119-1129.
    Citation: FENG Yan-fang, DENG Jin-fu, WANG Shi-jin, XIAO Qing-hui, LU Song-nian, LIU Cui, CUI Xian-yue, GONG Fan-ying, ZHEN Shi-min, JIA De-long, QI Fan-yu. The recognition of the magnesian andesitic series（MA）in the Precambrian granitic rocks in western Shandong Province and the continental crustal growth[J]. GEOLOGY IN CHINA, 2010, 37(4): 1119-1129.
    shu

    鲁西地区早前寒武纪花岗岩类中镁安山质岩石系列（MA）的识别及大陆地壳生长

    The recognition of the magnesian andesitic series（MA）in the Precambrian granitic rocks in western Shandong Province and the continental crustal growth

      摘要
    • 摘要: 提要：本文基于汇集的39个锆石SHRIMP和LA-ICP-MSU-Pb同位素年龄，186件岩石化学样品，并参考前人已有划分方案，提出鲁西地区早前寒武纪花岗岩类初步年代格架：（1）新太古代早中期（2741～2612Ma）；（2）新太古代晚期（2563～2500 Ma）；（3）古元古代早期（2494～2435 Ma）。探讨与之相对应的岩石组合和演化趋势：（1）英云闪长岩（T1）－奥长花岗岩（T2）－花岗闪长岩（G1），具奥长花岗岩演化趋势；（2）英云闪长岩（T1）－奥长花岗岩（T2）－花岗闪长岩（G1）－花岗岩（G2）－石英二长岩（QM），同时兼具奥长花岗岩演化趋势和钙碱性演化趋势；（3）花岗岩（G2）－石英二长岩（QM），具钙碱性演化趋势。基于SiO2-MgO和SiO2-FeO?鄢/MgO关系，提出T1T2G1绝大部分具镁安山质岩石系列（MA）的性质，指示它们形成于洋俯冲环境，并结合岩石组合的类型，论证了第一、二、三期花岗岩类分别形成于岛弧、大陆边缘弧和大陆碰撞环境。进而认为，第一、二、三期花岗岩类代表了新生的初始不成熟陆壳，过渡性的半成熟陆壳和成熟的陆壳。这样，鲁西地区从新太古代早中期，经新太古代晚期，至古元古代早期的花岗岩类，记录了鲁西地区大陆地壳形成的完整的地质演化过程。

       

      Abstract: Abstract：Based on 39 SHRIMP and LA-ICP-MS Zircon U-Pb ages, 192 petrochemical data, and two representative age frameworks, this paper suggests a preliminary scheme of the age framework for the early Precambrian granites in western Shandong Province, i.e., three stages of （1）early-middle Neoarchean（2741～2612 Ma）,（2）Late Neoarchean（2563～2500 Ma）, and（3）early Paleoproterozoic（2494～2435 Ma）, which correspond to three rock assemblages and the evolutional trends of （1）T1T2G1 with trondhjemitic trend,（2）T1T2G1G2QM with both trondhjemitic and calc-alkaline trends,（3）G2QM with calc-alkaline trend. On the basis of both SiO2-MgO and SiO2-FeO/MgO relations, most of T1T2G1 having the magnesian andesitic rock (MA) characteristics is considered to have been formed in the oceanic subduction setting. It is thought that three stages of granitic rock assemblages might have been formed in island-arc, continental marginal arc, and continental collisional settings, respectively, and probably represented the compositions of immature, semi-mature, and mature continental crust, respectively. Thus, the granitic rocks have recorded the process of the formation of the continental crust.

       

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