| 郭博然,王玉往,解洪晶,石煜,周国超.新疆北部蛇绿岩型铬铁矿床铬尖晶石的类型及其矿物化学成分[J].矿产勘查,2018,9(12):2339-2352 |
| 新疆北部蛇绿岩型铬铁矿床铬尖晶石的类型及其矿物化学成分 |
| The Category and Mineral Chemical Composition of chrome spinel in Ophiolite-type Chromite Deposits in north of Xinjiang |
| 投稿时间：2018-10-15 |
| DOI： |
| 中文关键词: 铬尖晶石 豆荚状铬铁矿 蛇绿岩 新疆北部 |
| 英文关键词: chromium spinel, podiform chromite deposit, ophiolite, Northern Xinjiang |
| 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: |
| 作为蛇绿岩型铬铁矿的重要产区,新疆北部地区发育多处中小型铬铁矿矿床。铬尖晶石一直以来是作为研究地幔橄榄岩成因与铬铁矿形成过程的重要载体之一。本文在对萨尔托海、鲸鱼、阿克塔斯和清水等地区的造矿铬尖晶石与副矿物铬尖晶石进行了形态学与矿物化学成分的研究,发现造矿铬尖晶石产出特征以中粗粒半自形-自形结构为主,自形程度较好,Cr#值较高；副矿物铬尖晶石自形程度较差,多表现为中细粒半自形-他形结构,呈粒状-蠕虫港湾状,边缘蚀变程度很强烈,Cr#值较低。造矿铬尖晶石成分相对均一,副矿物铬尖晶石成分变化较大,暗示铬铁矿的形成,并不是地幔橄榄岩中副矿物铬尖晶石的简单聚集,而是复杂多期次多阶段熔融的结果。 |
| 英文摘要: |
| As one of the majormining areas ofophiolite-type chromite deposits,there are many middle/small size chromite deposits in Northern Xinjiang.The chromium spinel has been always as a carrier for studying the origin of mantle peridotite and the formation of chromite. In this contribution, we have studied the morphology and mineral chemistry of the chromium spinel and theaccessory mineral chromium spinelinSartohay, Jingyu, Aketasi and Qingshui deposits. Through investigation, we found that the mineralized chromium spinel is characterized by itsmedium-grainded orcoarse-grainedeuhedral-hypidiomorphic structures and high Cr# values, whereas the accessory mineral chromium spinel exhibits as medium-grainded or fine-grained hypidiomorphic-xenomorphic structure, lower Cr# values and strongly alteration at edges. The mineralized chromium spinel has a relatively homogeneous composition, and the composition of accessory mineral chromium spinel varies in a large range. These data indicate that the formation of chromite resulted from the complicated and multi-stage melting processes, rather than simple aggregation of accessory mineral chromium spinel in mantle peridotite. |
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