| 广西花山花岗岩的岩石学和地球化学特征及成岩物质来源的探讨 |
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| 引用本文： | 朱金初,李向东.广西花山花岗岩的岩石学和地球化学特征及成岩物质来源的探讨[J].岩石矿物学杂志,1988,7(1):28-38. |
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| 作者姓名： | 朱金初 李向东 |
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| 作者单位： | 南京大学地球科学系
(朱金初)，南京大学地球科学系(李向东) |
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| 摘 要： | 本文研究了花山花岗岩的岩石学、地球化学和同位素地质学特征,确定了花山岩体是一个由三期独立的、不同时代、不同成因和不同物质来源的花岗质岩浆岩所组成的复式岩体。第一期印支期牛庙石英二长岩和同安石英二长岩,属以幔源物质为主的壳幔混合来源,由上地幔分异岩浆上侵并同化混染了地壳物质而形成;第二期燕山早期花山主体花岗岩亦属壳幔混合来源,但其壳幔物质比值有所增高。上地幔沿东西向区域性深断裂的上拱和地壳物质(包括沉积组分和火成组分)受热重熔,是该期花岗岩的可能成因;第三期燕山晚期细粒花岗岩小岩体是由以沉积组分为主的地壳物质经部分熔融、重熔或深熔而成。
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| 关 键 词： | 花山花岗岩 岩石学 微量元素地球化学 锶钕同位素 壳幔物质来源 |
Petrological-Geochemical Features and Source Materials of Huashan Granites, Guangxi Autonomous Region |
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| Zhu Jinchu Li Xiangdong.Petrological-Geochemical Features and Source Materials of Huashan Granites, Guangxi Autonomous Region[J].Acta Petrologica Et Mineralogica,1988,7(1):28-38. |
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| Authors: | Zhu Jinchu Li Xiangdong |
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| Abstract: | This paper studies the petrological, geochemical and isotopic characteristics of Huashan granites. It has been identified that the Huashan granite body is a complex consisting of granitic rocks of three different independent stages, with different petrogeneses and different source materials. The first stage is the Triassic Niumiao quartz monzodiorite and Tongan quartz monzonite of crustmantle mixed type, with predominance of mantle source. It is emplaced by the differentiated magma from upper mantle and contaminated by crustal martials. The second ttage is the Jurassic Huashan main body granite, also of crustmantle mixed type, with a higher crustal source to mantle source ratio.Upwarping of upper mantle along the WE trending deep fault and remelting of heated crustal materials (including sedimentary component and igneous component) is its possible genesis. The third stage is the Cretaceous fine-grained granite stocks and apophyses of mainly crustal source. They are formed by partial melting, remelting or anatexis of crustal materials dominated by sedimentary component. |
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| Keywords: | Huashan granites petrology trace elements geochemistry Sr and Nd isotopes mantle-crustal material source |
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