| THE ROCK ASSOCIATION IN JINSHAJIANG MELANGE BELT |
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| 作者姓名： | Lin Shiliang |
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| 作者单位： | Chengdu Institute of Geology and Mineral Resources，Chengdu 610082，China |
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| 摘 要： | THE ROCK ASSOCIATION IN JINSHAJIANG MELANGE BELT
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THE ROCK ASSOCIATION IN JINSHAJIANG MELANGE BELT |
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| Lin Shiliang.THE ROCK ASSOCIATION IN JINSHAJIANG MELANGE BELT[J].Earth Science Frontiers,2000(Z1). |
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| Authors: | Lin Shiliang |
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| Abstract: | Jinshajiang melange belt locates between Jianda\|Weixi island arc and Zhongzha massif. The melange belt and island arc makes up Jinshajiang plate junction. Although subsequent tectonic movements had complexed the structural form of Jinshajiang melange belt, there are still a lots of structural block remained which carried amount of information about the tectonic evolution of the belt. Recent researches have identified several kinds of rock association in the structural blocks.(1) Ophiolite:The ophiolite consists of serpentinization ultramafite, ultramafic cumulus crystal rock (pyroxenite, dunite), gabbro, diabase cluster, ocean\|ridge type basalt, plagiogranite and radiolarian silicalite. The isotopic age shows that the ultramafite and basalt formed during Upper Carboniferous and Lower Permian. The silicalite is high in radiolaria of Lower Permian.(2) Rock association of oceanic island\|arc:The liptocoenosis of oceanic island\|arc scatter in melange belt, it mainly consists of sandy slate, pyroclastic rock, silicalite, basalt and andesite. A part of volcanic rock belongs to calc\|alkaline volcanic suite and the other is tholeiite. The petrochemistry, REE and microelement of volcanic rock have the feature of the rock in ocean\|island arc. The isotopic age of basalt shows that the ocean\|island arc formed in Lower Permian. |
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| Keywords: | rock association Jinshajiang melange belt ophiolite structura l blocks |
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