| 石煜,王玉往,王京彬,李德东,周国超,龙灵利,解洪晶.东天山牛毛泉钒钛磁铁矿矿床单斜辉石成分及其地质意义[J].矿产勘查,2018,9(12):2311-2323 |
| 东天山牛毛泉钒钛磁铁矿矿床单斜辉石成分及其地质意义 |
| Composition of clinopyroxene from Niumaoquan Fe-Ti-V oxide deposit,Eastern Tianshan, and its geological implications |
| 投稿时间：2018-07-15 |
| DOI： |
| 中文关键词: 东天山 牛毛泉 钒钛磁铁矿 成矿作用 单斜辉石 |
| 英文关键词: eastern Tianshan, Niumaoquan, Fe-Ti-V oxide deposit, metallogenesis, clinopyroxene |
| 基金项目:国家重点研发计划(编号:2017YFC0601204)资助。 |
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| 中文摘要: |
| 牛毛泉矿床是东天山地区典型的钒钛磁铁矿矿床之一,赋存于牛毛泉层状辉长岩中,其岩石类型主要包含橄榄辉长岩、斜长岩、辉长岩和角闪辉长岩,其中辉长岩和角闪辉长岩为主要的赋矿岩相。单斜辉石是牛毛泉各相辉长岩的主要造岩矿物,其成分对限定岩浆的构造环境、成分特征和分异演化行为有着重要作用。本文对牛毛泉岩体各相辉长岩进行了系统的电子探针成分分析,结果表明所有单斜辉石主要为透辉石和普通辉石,随着单斜辉石Mg#逐渐降低,成分逐渐由透辉石向普通辉石过渡。牛毛泉各相辉长岩单斜辉石的成分特征表明其母岩浆为亚碱性,具有拉斑玄武岩系列的演化特征,可能形成于后碰撞伸展环境。分离结晶作用不仅使残余岩浆中成矿元素和挥发分含量增高,也使得岩浆氧逸度升高,是牛毛泉钒钛磁铁矿矿床形成的关键机制。 |
| 英文摘要: |
| Niumaoquan deposit is one of the typical Fe-Ti-V oxide deposits in eastern Tianshan, and hosted in the Niumaoquan layered gabbroic intrusion, which is mainly composed of olivine gabbro, anorthosite, gabbro and hornblende gabbro. The Fe-Ti-V oxide orebodies of the Niumaoquan deposit are generally hosted in the gabbro and hornblende gabbro. Clinopyroxene is one of the major siliceous rock-forming minerals of the Niumaoquan gabbroic rocks, and its composition plays an important role to constraints the tectonic background, composition characteristic and the differentiation mechanism of the parental magma. This study analyzed the composition of clinopyroxene from the Niumaoquan gabbroic rocks by means of EMPA, and the result demonstrate that all clinopyroxene are mainly diopside and augite. Clinopyroxene from olivine gabbro, anorthosite, gabbro and hornblende gabbro have decreased Mg# number, and generally evolved from diopside to augite. The composition of clinopyxene from the Niumaoquan gabbroic rocks suggest that the parental magma is sub-alkaline, and displays tholeiitic basalt differentiation trend, possibly formed in a post-collisional stage. Fractional crystallization not only induced increases of metallogenic elements and volatile contents in the residual melt, but also elevation of oxygen fugacity, and is the key mechanism during the formation of the Niumaoquan Fe-Ti-V oxide deposit. |
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