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| 中国斑岩铜矿与埃达克(质)岩关系探讨 | |
| 引用本文： | 冷成彪,张兴春,陈衍景,王守旭,苟体忠,陈伟.中国斑岩铜矿与埃达克(质)岩关系探讨[J].地学前缘,2007,14(5). |
| 作者姓名： | 冷成彪 张兴春 陈衍景 王守旭 苟体忠 陈伟 |
| 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,贵州,贵阳,550002;中国科学院,研究生院,北京,100039 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,贵州,贵阳,550002 3. 北京大学,造山带与地壳演化开放实验室,北京,100871;中国科学院,广州地球化学研究所,广东,广州,510640 4. 中国科学院,研究生院,北京,100039;中国科学院,广州地球化学研究所,广东,广州,510640 |
| 基金项目： | 国家自然科学基金 , 国家重点基础研究发展计划(973计划) |
| 摘 要： | 对比研究了中国26个主要斑岩铜矿的地球化学特征和年代学,结果表明其中25个矿床与埃达克(质)岩有成因联系,且多数与玄武质下地壳熔融形成的埃达克岩(C型)有关,现有数据表明土屋-延东和普朗斑岩铜矿可能与俯冲板片熔融形成的埃达克岩(O型)有关。容矿斑岩的初始锶值为0.7034～0.7090,均大于洋中脊玄武岩和亏损地幔的初始锶值,多数与EMI的初始锶值接近,推测其源区或源岩主要为玄武质下地壳,少数为洋中脊玄武岩,并受到中、上地壳不同程度的混染,这与两类埃达克岩的源区基本一致。虽然埃达克质岩浆具有形成斑岩铜矿的巨大潜力,但并非所有埃达克岩都能成矿,不同岩体需具体分析。 |
| 关 键 词： | 斑岩铜矿 埃达克(质)岩 初始锶值 年代学 |
Discussion on the relationship between Chinese porphyry copper deposits and adakitic rocks |
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| Leng Chengbiao,Zhang Xingchun,Chen Yanjing,Wang Shouxu,Gou Tizhong,Chen Wei.Discussion on the relationship between Chinese porphyry copper deposits and adakitic rocks[J].Earth Science Frontiers,2007,14(5). | |
| Authors: | Leng Chengbiao Zhang Xingchun Chen Yanjing Wang Shouxu Gou Tizhong Chen Wei |
| Abstract: | A comparative study of the geochemical characteristics and geochronological data of 26 main porphyry copper deposits in China has been carried out.The results of this work indicates that 25 deposits are associated with adakitic rocks especially associated with the C-type adakite,formed by the magma derived from the partial melting of basaltic lower-crust.The available data show that the Tuwu-Yandong and Pulang porphyry copper deposits are probably associated with O-type adakite,formed by magmas derived from the partial melting of subducted oceanic plate.The initial 87Sr/86Sr values of the ore-bearing porphyries range from 0.703 4 to 0.709 0,which are all larger than MORB and depleted mantle(DM),but mostly very close to that of the type-I enriched mantle(EMI).Therefore,it is assumed that most of these porphyries are originally associated with magmas derived from the partial melting of the basaltic lower-crust.More rarely,porphyries are associated with the magma derived from the partial melting of the MORB.The parental magmas of these porphyries could be contaminated by mid-upper crust in various degrees.These characteristics of the ore-bearing porphyries are basically in accordance with those of the above two types of adakites.Although the adakitic magma has great potential for the development of porphyry copper systems,not all types of adakite can lead to the generation of porphyry copper deposits.Therefore,a detailed analysis should be carried out to ascertain the possible presence of porphyry copper systems in adakitic complexes. |
| Keywords: | porphyry copper deposits adakitic rocks initial 87Sr/86Sr |
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