| 周国超,王玉往,石煜,解洪晶,李德东,郭博然.东天山三宫岩体角闪石矿物学特征及其地质意义[J].矿产勘查,2018,9(12):2386-2395 |
| 东天山三宫岩体角闪石矿物学特征及其地质意义 |
| Mineralogical characteristics andgeological significance of the amphibole of the Sangong intrusion in the eastern Tianshan |
| 投稿时间：2018-10-15 |
| DOI： |
| 中文关键词: 角闪石 矿物学特征 铜镍矿化岩体 三宫 东天山 |
| 英文关键词: amphibole, mineralogical characteristics, Ni-Cu mineralization intrusion, Sangong mafic intrusion, eastern Tianshan |
| 基金项目:国家重点研发计划项目(编号:2017YFC0601204)资助。 |
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| 中文摘要: |
| 三宫岩体是东天山哈尔里克岛弧带南缘新发现的二叠纪铜镍矿化岩体,由浅部到深部主要岩石类型依次为辉长岩、橄榄辉长岩和含角闪石橄榄辉长岩,各岩相普遍发育富水矿物角闪石。文章应用电子探针对角闪石进行了成分分析,并探讨了其形成的物理化学条件。结果表明三宫岩体角闪石属于钙角闪石类的韭闪石和镁绿钙闪石,为幔源岩浆结晶形成；三宫岩体是碰撞后伸展阶段幔源岩浆上侵形成,成岩深度为7.1~10.6 km,温度为909~968℃,压力为201~299 Mpa,岩浆氧逸度较高,o2为-9.6~-10.4,水量为2.9%~4.3%。综合研究认为,岩浆源区和结晶环境可能共同导致了岩体具有高氧逸度和富水的特征。 |
| 英文摘要: |
| The Sangong Ni-Cu mineralization intrusion is a newly-discovered intrusion located in the southern section of Paleozoic Harlik island arc, Eastern Tianshan. The mafic intrusion formed in the early Permain and mainly consists of gabbro, olivine gabbro and amphibole-bearing olivine gabbro with the increasing depth. The compositional analysis of amphibole mineral in the mafic rock was conducted by EMPA, and the physicochemical parameters of the parental magma were calculated and discussed. The results suggest that the amphibole mineral in the Sangong mafic rock is classified as pargasite and magnesiohastingsite, and is produced by crystallization of mantle-derived magma. The Sangong Ni-Cu mineralization intrusion is the direct crystallization products of mantle-derived magma emplacement in the Post-collisional crustal extension setting, and the mafic rock crystallized at the temperature of 909℃-968℃, the pressure of 201 Mpa-299 Mpa, the oxygen fugacity of -9.6--10.4 and H2O content of the melt is 2.9%-4.3%. Comperhensive study showed that the magma source and crystallization environment jointly caused the characteristics of water -rich and high oxygen fugacity of the intrusion. |
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