| 吉林永吉大黑山钼矿寄主岩体地球化学特征及其成因 |
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| 引用本文： | 陈井胜,葛文春,陈会军,邢德和,刘淼,李崴崴.吉林永吉大黑山钼矿寄主岩体地球化学特征及其成因[J].地质与资源,2015,24(2):93-101. |
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| 作者姓名： | 陈井胜 葛文春 陈会军 邢德和 刘淼 李崴崴 |
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| 作者单位： | 1. 中国地质调查局 沈阳地质调查中心(沈阳地质矿产研究所), 辽宁 沈阳 110034;2. 吉林大学 地球科学学院, 吉林 长春 130026;3. 辽宁省地质矿产研究院, 辽宁 沈阳 110029 |
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| 基金项目： | 中国地质调查局区域地质大调查项目（12120114085601、12120113058400、12120113053400）. |
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| 摘 要： | 大黑山斑岩型钼矿花岗质岩体主要岩石类型为花岗闪长岩和花岗闪长斑岩,呈复式岩体状产出.含矿的花岗闪长斑岩体具有较高的Al2O3含量(A/CNK=1.04~1.25),较低的Mg指数(Mg#=21~44);轻重稀土分馏明显,没有或具有轻微的负铕异常(δEu=0.82~1),表明可能源区基本没有斜长石残留;富集大离子亲石元素Rb、Ba、Sr,相对亏损Nb、Ta、Y、Yb、Th、P和Ti,高Sr/Y、Sr/Yb比值,类似中国东部的"C型"埃达克岩.不含矿的花岗闪长岩A/CNK=1.01~1.03,轻稀土富集,重稀土亏损,中等的负铕异常(δEu=0.62~0.63),富集大离子亲石元素Rb、Th元素,亏损Nb、Ta、Zr等高场强元素,强烈亏损P和Ti元素相,比较低的Sr/Y、Sr/Yb比值.Hf同位素特征显示,大黑山花岗质岩体是由中—新元古代亏损地幔中增生的新生地壳,在中生代发生熔融而形成的.结合太平洋板块构造演化史以及近年获得的黑龙江杂岩碎屑锆石年龄和黑龙江群蛇绿混杂岩中蓝片岩相变质作用的年龄,表明太平洋板块晚三叠世—早侏罗世开始向西俯冲,说明大黑山花岗质岩体的形成与太平洋板块俯冲有关.
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| 关 键 词： | 大黑山钼矿 花岗闪长斑岩 岩石地球化学特征 Hf同位素 成因 吉林省 |
| 收稿时间： | 2015-01-19 |
GEOCHEMISTRY AND GENESIS OF THE HOST ROCK OF DAHEISHAN MOLYBDENUM DEPOSIT IN YONGJI,JILIN PROVINCE |
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| CHEN Jing-sheng,GE Wen-chun,CHEN Hui-jun,XING De-he,LIU Miao,LI Wei-wei.GEOCHEMISTRY AND GENESIS OF THE HOST ROCK OF DAHEISHAN MOLYBDENUM DEPOSIT IN YONGJI,JILIN PROVINCE[J].Geology and Resources,2015,24(2):93-101. |
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| Authors: | CHEN Jing-sheng GE Wen-chun CHEN Hui-jun XING De-he LIU Miao LI Wei-wei |
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| Institution: | 1. Shenyang Institute of Geology and Mineral Recourses, CGS, Shenyang 110034, China;2. College of Earth Sciences, Jilin University, Changchun 130026, China;3. Liaoning Institute of Geology and Mineral Resources, Shenyang 110029, China |
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| Abstract: | The granitic rock masses in Daheishan porphyry Mo deposit are mainly granodiorite and granodiorite porphyry, occurred in composite massif. The ore-bearing granodiorite porphyry has a high content of Al2O3(A/CNK=1.04 -1.25) and low Mg#(Mg#=21-44), with distinct LREE and HREE fractionations, without or with slightly negative Eu anomalies(δEu=0.82-1), which indicates that there may be no plagioclase remaining in the source area. It is similar to the C-type adakite in eastern China, which is enriched in large ion lithophile elements(LILEs, such as Rb, Ba and Sr) and depleted in Nb, Ta, Y, Yb, Th, P and Ti, with a high ratio of Sr/Y and Sr/Yb. The ore-free granodiorite (A/CNK=1.01-1.03), with rich LREEs, depleted HREEs and moderately negative Eu anomalies(δEu=0.62-0.63), is enriched in LILEs(such as Rb and Th) and depleted in P, Ti and high field strength elements (HFSEs, such as Nb, Ta and Zr), and has a low ratio of Sr/Y and Sr/Yb. The features of Hf isotopes show that the Daheishan granitic rocks were formed by the Mesozoic melting of the accreted crust from the Meso-Neoproterozoic depleted mantle. The tectonic evolution history of Pacific plate, together with the detrital zircon age of Heilongjiang complex and the age of the blueschist facies metamorphism of ophiolitic mélange in Heilongjiang group indicate that the formation of Daheishan granitic rocks is related to the westward subduction of Pacific plate beginning in the Late Triassic-Early Jurassic Epoch. |
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| Keywords: | Daheishan Mo deposit granodiorite porphyry lithogeochemistry Hf isotope genesis Jilin Province |
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