| 玉龙斑岩铜矿含矿与非含矿斑岩元素和同位素地球化学对比研究 |
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| 引用本文： | 姜耀辉 蒋少涌 戴宝章 凌洪飞. 玉龙斑岩铜矿含矿与非含矿斑岩元素和同位素地球化学对比研究[J]. 岩石学报, 2006, 22(10): 2561-2566. |
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| 作者姓名： | 姜耀辉 蒋少涌 戴宝章 凌洪飞 |
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| 作者单位： | 南京大学地球科学系成矿作用国家重点实验室,南京210093 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金 |
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| 摘 要： | 地质地球化学对比研究表明，玉龙含矿与非含矿斑岩是由岩石圈地幔中交代成因的金云母-石榴石单斜辉石岩脉发生不同程度部分熔融而形成的。含矿斑岩是最早阶段熔融体，主要是由交代成因脉中副矿物（如磷灰石和碳酸盐矿物等）和含水矿物金云母发生部分熔融而形成的，因而富含F、Cl和水等挥发份，加上该阶段岩浆具有高氧化性特征，从而富含Cu等成矿元素；非含矿斑岩是交代成因脉相对较高熔融程度的产物，单斜辉石和石榴石介入了熔融作用，岩浆熔体相对贫乏F、Cl和水等挥发份，加上该阶段岩浆具有较低的fo2，从而不利于成矿。斑岩体全岩的F和Cl含量（含矿斑岩F〉1200PPm．Cl〉150ppm；非含矿斑岩F〈1200ppm，Cl〈150ppm）、K2O／Na2O（含矿斑岩〉1．2，非含矿斑岩〈1．2）和Sm／Yb（含矿斑岩〉6．5，非含矿斑岩〈6、5）比值以及黑云母中的Fe^3＋／Fe^2＋比值（含矿斑岩〉0．7，非含矿斑岩〈0．7）是区分含矿与非含矿斑岩的重要地球化学参数。含矿斑岩与非含矿斑岩具有非常相似的Sr-Nd-Pb同位素组成，表明含矿与非含矿斑岩具有相同的源区。
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| 关 键 词： | 含矿斑岩 非含矿斑岩 地球化学对比研究 玉龙斑岩铜矿床 |
| 文章编号： | 1000-0569/2006/022(10)-2561-66 |
| 收稿时间： | 2006-06-07 |
| 修稿时间： | 2006-07-28 |
Comparison on elemental and isotopic geochemistry of ore-bearing and barren porphyries from the Yulong porphyry Cu deposit, east Tibet. |
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| JIANG YaoHui, JIANG ShaoYong, DAI BaoZhang , LING HongFei. Comparison on elemental and isotopic geochemistry of ore-bearing and barren porphyries from the Yulong porphyry Cu deposit, east Tibet.[J]. Acta Petrologica Sinica, 2006, 22(10): 2561-2566. |
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| Authors: | JIANG YaoHui JIANG ShaoYong DAI BaoZhang LING HongFei |
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| Affiliation: | State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China |
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| Abstract: | Geological and geochemical comparison studies indicate that the ore-bearing and barren porphyries in the Yulong porphyry Cu deposit were derived by different degree partial melting of the vein of phlogopite-garnet clinopyroxenite in an lherzolitic lithosphere. The ore-bearing porphyry represents the earliest melt derived by partial melting of accessory phases such as apatite and carbonate and hydrous mineral of phlogopite,and thus contains high contents of volatiles such as F,Cl and water,which is preferred for Cu to be extracted and enriched.The barren porphyry is the product at relatively high degree partial melting involving clinopyroxene and garnet, and thus depleted in volatiles,which makes it to be evolved as barren one.F and C1 contents (F>1200 ppm,Cl>150 ppm for ore- bearing porphyry and F<1200 ppm,Cl<150 ppm for barren porphyry) and K_2O/Na_2O (>1.2 for ore-bearing porphyry and <1.2 for barren porphyry),Sm/Yb (>6.5 for ore-bearing porphyry and <6.5 for barren porphyry) ratios of porphyries and Fe~(3 )/Fe~(2 ) ratios (>0.7 for ore-bearing porphyry and <0.7 for barren porphyry) of biotite are the important geochemical paralneter to discriminate ore-bearing and barren porphyries.The ore-bearing porphyries share similar Sr-Nd-Pb isotopic compositions as the barren porphyries,suggesting they have similar source regions. |
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| Keywords: | Ore-bearing porphyry Barren porphyry Geochemical comparison study Yulong porphyry Cu deposit |
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