| 闽南沿海地区变质变形侵入岩时序划分及其地质意义 |
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| 引用本文： | 石建基.闽南沿海地区变质变形侵入岩时序划分及其地质意义[J].福建地质,2010,29(4):323-333. |
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| 作者姓名： | 石建基 |
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| 作者单位： | [1]中国地质大学,北京100083 [2]福建省闽东南地质大队,泉州362021 |
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| 摘 要： | 根据接触关系,结合同位素测年资料、岩石变形变质特征及原岩的岩石学、矿物学等特征,将闽南沿海地区变质变形侵入岩划分为早侏罗世东山序列(石英闪长岩—花岗闪长岩—二长花岗岩—正长花岗岩)、晚侏罗世古美山序列(花岗闪长岩—二长花岗岩—正长花岗岩)(145.4 Ma,LA-ICPMS锆石U-Pb)及早白垩世早期漳浦序列(石英闪长岩—花岗闪长岩—二长花岗岩—正长花岗岩)(121.5～139.4 Ma,锆石U-Pb)。并据侵入岩产状、岩石学、矿物学、岩石化学及地球化学等特征,分析各序列花岗岩的成因及形成时的构造环境,认为早侏罗世东山序列岩浆来源为壳-幔混合源(I型),形成于构造体制由挤压转向拉张转换期大陆上隆(碰撞后隆升)的构造环境(PAG);晚侏罗世古美山序列岩浆来源为幔-壳混合源(I-S型),属与板块碰撞(俯冲作用)有关的同碰撞花岗岩(ACG);早白垩世早期漳浦序列岩浆来源为壳-幔混合源(I-S型),属构造体制由挤压向拉张转化时期幔-壳源型花岗岩(KCG)。该区变质变形花岗岩序次的厘定及其成因、形成环境的研究为长乐—南澳断裂带中生代构造演化提供了依据,并为东南沿海地区寻找与中生代岩浆作用有关的钨、锡、铜、钼等矿产提供找矿理论依据。
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| 关 键 词： | 时序划分 侵入岩 变质变形 闽东南沿海 |
Division and Geological Meanings of the Timing Sequence for the Metamorphosed and Deformed Intrusive Rocks in the Coastal Area of South Fujian |
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| Shi Jianji.Division and Geological Meanings of the Timing Sequence for the Metamorphosed and Deformed Intrusive Rocks in the Coastal Area of South Fujian[J].Geology of Fujian,2010,29(4):323-333. |
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| Authors: | Shi Jianji |
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| Institution: | Shi Jianji (China University of Geosciences , Bej ing , 10083; Southeastern Fujian Geology Party of Fujian Province, Quanzhou, 362021) |
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| Abstract: | Based on the contact relations, the isotopic dating data, the de/ormational and metamorphic characteristics of rocks and the petrologic and mineralogical characteristics of primary rock, the metamorphosed and deformed intrusive rocks in the coastal area of South Fujian can be divided into three rock sequences, namely, the lower Jurassic Dongshan Sequence （quartz diorite ＋ Granodiorite ＋ monzonitic granite ＋ syenogranite）, the late Jurassic Gumeishan Sequence （granodiorite ＋ monzonitic granite-I syenogranite, 145.4Ma） and the lower Cretaceous Zhangpu Sequence （quartz diorite ＋ granodiorite 11-monzonitic granite＋syenogranite, 121.5-139.4Ma）. On the basis of the occurrence, petrologic, mineralogical, petrochemistry and geochemistry characteristics of the intrusive rocks and the analyzing results of the granitic genesis of different sequences and the shape-forming tectonic setting, it is considered that the magmatic origin of the lower Jurassic Dongshan Sequence is the crust-mantle mixing source （ I Type）, which forms from the tectonic setting of continent uplifting during the alternative period of extrusion by compression, that the magmatic origin of the late Jurassic Gumeishan Sequence is the mantle-crust source （ I-S type） , which belongs to the syn collision granite related to the plate collision （ subduction）, and that the magmatic origin of the lower Cretaceous Zhangpu Sequence is the crust-mantle mixing source （I-S type）, which belongs to the granite of the mantle-crust-derived type formed in the conversion period of extrusion by compression. The sequence determination of the metamor- phosed and deformed granite in the surveyed area and the analysis results of the granite genesis and forming environment can provide with the reference for the research of the Mesozoic structural evolution of the Changle-Nan＇ao Fault Zone and offer to a prospecting direction of hunting for the ores such as tungsten, stannum, copper and molybdenum related to the Mesozoic magmatism in the coastal area of Southeast China. |
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| Keywords: | division of timing sequences intrusive rock metamorphism and deformation the coastal area of southeastern Fujian |
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