Fe-Mg同位素在蛇绿岩中铬铁矿床成因研究中的应用潜力

苏本勋; 肖燕; 陈晨; 白洋; 刘霞; 梁子; 彭青山

doi:10.3799/dqkx.2018.705

Fe-Mg同位素在蛇绿岩中铬铁矿床成因研究中的应用潜力

doi: 10.3799/dqkx.2018.705

苏本勋^1,2,3,,
肖燕^2,4,
陈晨^1,2,3,
白洋^1,2,3,
刘霞^1,5,
梁子^2,3,4,
彭青山⁶

1.
中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029
2.
中国科学院地球科学研究院, 北京 100029
3.
中国科学院大学, 北京 100049
4.
中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029
5.
成都理工大学地球科学学院, 四川成都 610059
6.
长春工程学院勘查与测绘工程学院, 吉林长春 130012

基金项目:

国家自然科学基金项目 41772055

国家自然科学基金项目 91755205

中国科学院地质与地球物理研究所岩石圈演化国家重点实验室项目 201701

详细信息

作者简介:
苏本勋(1982-), 男, 研究员, 研究方向为镁铁-超镁铁岩成岩成矿作用

中图分类号: P581
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出版历程
- 收稿日期: 2017-12-20
- 刊出日期: 2018-04-15

Potential Applications of Fe and Mg Isotopes in Genesis of Chromite Deposits in Ophiolites

Su Benxun^{1,2,3
,},
Xiao Yan^2,4,
Chen Chen^1,2,3,
Bai Yang^1,2,3,
Liu Xia^1,5,
Liang Zi^2,3,4,
Peng Qingshan⁶

1.
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
5.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
6.
Faculty of Prospecting and Survey Engineering, Changchun Institute of Technology, Changchun 130012, China

摘要

摘要: 蛇绿岩中铬铁矿床成因一直存在较大争议，其主要原因可归结为：寄主蛇绿岩存在成因争议、产出状态不清、矿石及围岩矿物组合单一以及主要矿物成分简单但矿物包裹体复杂多样.针对这些研究瓶颈，率先对西藏普兰和罗布莎、土耳其Kızıldaǧ和Kop蛇绿岩中的地幔橄榄岩和铬铁岩进行了全岩和单矿物Fe-Mg同位素的探索性研究工作.结果表明：（1）蛇绿岩中的地幔橄榄岩具有较均一的Fe-Mg同位素组成，与世界上其他地区的地幔橄榄岩相似；（2）铬铁岩中铬铁矿和橄榄石之间存在明显的Fe-Mg同位素分馏，铬铁矿多具有比共存橄榄石轻的Fe同位素组成，与地幔橄榄岩中的尖晶石和橄榄石相反，Mg同位素变化较大；（3）铬铁矿和橄榄石的Fe-Mg同位素主要受控于结晶分异和Fe-Mg交换，且这两个过程造成的同位素变化趋势明显不同.因此，Fe-Mg同位素在揭示铬铁矿母岩浆来源、性质及成矿过程方面具有较大的应用潜力.
- 蛇绿岩 /
- 铬铁矿 /
- Fe同位素 /
- Mg同位素 /
- 岩石学 /
- 矿物学
Abstract: Genesis of chromittie deposit in ophiolites has been debated for a long time. It is commonly related to host ophiolite, chromite occurrence, simple mineral assemblage and simple mineral chemistry, and unusual and complicated mineral inclusions. To constrain the genesis of chromite, a study on Fe and Mg isotopes of mantle peridotite and chromitite from Purang and Luobusa ophiolites in Tibet and Kızıldaǧ and Kop ophiolites in Turkey is conducted. The results reveal that (1) mantle peridotite of ophiolites has uniform Fe and Mg isotope compositions, falling in the same range of worldwide peridotite; (2) chromite and olivine in chromitite show large Fe and Mg isotope fractionations with overall lower δ⁵⁶Fe and higher δ²⁶Mg in chromite than olivine; (3) Fe and Mg isotope fractionations between chromite and olivine are mainly controlled by fractional crystallization and subsolidus Fe and Mg exchanges in two opposite processes. Therefore, Fe and Mg isotopes have great potentials to trace origin and nature of parental magmas of chromitite and crystallization and precipitation of chromite.
- ophiolite /
- chromite /
- Fe isotope /
- Mg isotope /
- petrology /
- mineralogy

HTML全文

图 1 蛇绿岩剖面图中的铬铁矿产出状态

据Paktunc(1990)修改

Fig. 1. Occurrence of chromite in ophiolite

下载: 全尺寸图片幻灯片

图 2 罗布莎蛇绿岩中方辉橄榄岩、纯橄岩和铬铁岩与典型玻安岩的铬铁矿(a)和橄榄石(b)成分相关性

罗布莎数据引自Xiong et al., 2015; Su et al., 2016; Xiao et al., 2016; 玻安岩数据引自GEOROC(http://georoc.mpch-mainz.gwdg.de/georoc/Start.asp)

Fig. 2. Correlation of compositions of chromite (a) and olivine (b) in harzburgite, dunite and chromitite from the Luobusa ophiolite with comparisons of those in typical boninite

下载: 全尺寸图片幻灯片

图 3 铬铁矿和橄榄石的结构

Fig. 3. Crystal structures of spinel (chromite) and olivine

下载: 全尺寸图片幻灯片

图 4 洋中脊玄武岩、洋岛玄武岩、玻安岩、岛弧玄武岩、深海橄榄岩、地幔橄榄岩捕掳体和蛇绿岩的Fe-Mg同位素组成

数据据Su et al.(2015)

Fig. 4. Fe and Mg isotope frequency distributions of boninites, island arc basalts, mid-ocean ridge basalts, oceanic island basalts, peridotite xenoliths, abyssal peridotites, and ophiolites

下载: 全尺寸图片幻灯片

图 5 普兰蛇绿岩岩石的Fe-Mg同位素组成的相关性

据Su et al.(2015)

Fig. 5. Correlation of δ⁵⁶Fe and δ²⁶Mg of the rocks from the Purang ophiolite

下载: 全尺寸图片幻灯片

图 6 Kızıldaǧ和罗布莎蛇绿岩中方辉橄榄岩、纯橄岩和铬铁岩单矿物的Fe和Mg同位素组成

数据引自Chen et al.(2015)，部分未发表；Xiao et al.(2016)

Fig. 6. Fe and Mg isotopic compositions of olivine, orthopyroxene and chromite in harzburgite, dunite and chromitite from Kızıldaǧ and Lubusa ophiolites

下载: 全尺寸图片幻灯片

图 7 铬铁矿和橄榄石之间的Fe-Mg交换方式及模拟计算结果

修改自Xiao et al.(2016)

Fig. 7. Modelling results of the effect by Fe-Mg exchange between chromite and olivine

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图 8 Kızıldaǧ、罗布莎和Kop蛇绿岩中铬铁岩的铬铁矿δ⁵⁶Fe与MgO相关性

数据引自Chen et al.(2015); Xiao et al.(2016); Zhang et al.(2017b)

Fig. 8. Correlation of δ⁵⁶Fe with MgO of chromite in chromitite from Kızıldaǧ, Luobusa and Kop ophiolites

下载: 全尺寸图片幻灯片

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