| 陕南勉略宁地区铜厂闪长岩岩石地球化学及SHRIMP锆石 U-Pb同位素年代学 |
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| 引用本文： | 叶霖,程增涛,陆丽娜,高伟,潘自平.陕南勉略宁地区铜厂闪长岩岩石地球化学及SHRIMP锆石 U-Pb同位素年代学[J].岩石学报,2009,25(11):2866-2876. |
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| 作者姓名： | 叶霖 程增涛 陆丽娜 高伟 潘自平 |
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| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳 550002;中国科学院广州地球化学研究所边缘海实验室,广州 510640
2. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳 550002;中国科学院研究生院,北京 100039 |
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| 基金项目： | 国家973项目，国家自然科学基金 |
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| 摘 要： | 本文对位于陕南勉略宁地区铜厂铜矿区与铜成矿作用有关的闪长岩进行了系统的岩石学、锆石U-Pb年代学和地球化学研究,讨论铜厂岩体的岩石成因、成岩物质来源及其地质意义和与铜厂铜矿床的关系.研究结果表明,铜厂闪长岩属于钙碱性-低钾岩系列岩石,以富大离子亲石元素和贫高场强元素为特征,其稀土配分模式为具Eu负异常和Ce异常不明显的轻稀土富集型,与碧口群海相火山岩具有一定相似性和继承性.闪长岩主要来源于壳源或曾受到地壳物质的强烈混染,并没有经历过显著的结晶分异演化,且与铜成矿有密切的关系,为该区主要成矿物质来源之一.岩体形成的大地构造背景属于碰撞隆起-岛弧火山,成矿作用晚于岩体侵入.铜厂闪长岩的锆石SHRIMP U-Pb同位素年龄为842±6.5Ma,早于秦岭造山带的主造山期.该区晋宁期俯冲-挤压造山作用,形成了碧口岩群岛弧火山岩系,铜厂闪长岩可能属于地层.碧口群细碧角斑岩末期火山侵入杂岩,由碧口群火山岩的局部熔融作用形成,其轻稀土的相对富集可能与岩体继承源岩的稀土特征有关.
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| 关 键 词： | 勉略宁地区 铜厂 闪长岩 岩石地球化学 锆石SHRIMPU-Ph定年 |
Petrological geochronology and zircon SHRIMP U-Pb of Tongchang diorites, Mianluening area, Southern Shaanxi provience, China |
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| YE Lin,CHENG ZengTai,LU LiNa,GA Wei,PAN ZiPing.Petrological geochronology and zircon SHRIMP U-Pb of Tongchang diorites, Mianluening area, Southern Shaanxi provience, China[J].Acta Petrologica Sinica,2009,25(11):2866-2876. |
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| Authors: | YE Lin CHENG ZengTai LU LiNa GA Wei PAN ZiPing |
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| Abstract: | The paper research on the petrological geochronology and zircon SHRIMP U-Pb of Thongchang diorites,Mian-Lue-Ning area,Southern Shanxi Province,China.The results show that the diorites,which belong to low K cale-alkali series rocks,are characterized by comparative losing of medium-high field strong elements in microelements and comparative enrichment of large ion lithophile elements.The Chondrite-normalized REE patterns of the diorites,which are similar and successive with that of Bikou group marine volcanic rocks,belong to the LREE-rich type with obvious negative anomaly of Eu,reflecting its island-arc volcanic features.It is suggested that there is a relationship between the diorites and the mineralization of Cu,the diorites may be one of source of metallogenic mass,and the diorites may come from the earth's crust or consumingly contaminated by the earth's crust with no remarkable crystallization differentiation.The geological setting of the forming of the diorltes was belonging to collision doming-island arc volcanic,and the mineralization was late to the intrusion of the diorites.The diorhes has a SHRIMP zircon U-Pb age of 842±6.5Ma and suggests it belongs to the invasive magma at the late stage of the stratum-Bikou group spilite,and formed by partly melting from Bikou group spilite.The comparative enrichment of LREE of the diorites may relate to inheriting the REE feature of the source of rocks. |
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| Keywords: | Mian-lue-Ning area Tongehang Diorite Petrological geochronology Zircon SHRIMP U-Pb age |
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