| DOI: | 10.1038/ngeo2860
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| 论文题名: | Silicate mineralogy at the surface of Mercury |
| 作者: | Namur O.; Charlier B.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2017
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| 卷: | 10, 期:1 | | 起始页码: | 9
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| 结束页码: | 13
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| 语种: | 英语
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| Scopus关键词: | cooling
; crystallization
; magma
; magnesium
; mercury (element)
; mineralogy
; plagioclase
; silicate
; spacecraft
; temporal evolution
|
| 英文摘要: | NASA's MESSENGER spacecraft has revealed geochemical diversity across Mercury's volcanic crust. Near-infrared to ultraviolet spectra and images have provided evidence for the Fe2+ -poor nature of silicate minerals, magnesium sulfide minerals in hollows and a darkening component attributed to graphite, but existing spectral data is insufficient to build a mineralogical map for the planet. Here we investigate the mineralogical variability of silicates in Mercury's crust using crystallization experiments on magmas with compositions and under reducing conditions expected for Mercury. We find a common crystallization sequence consisting of olivine, plagioclase, pyroxenes and tridymite for all magmas tested. Depending on the cooling rate, we suggest that lavas on Mercury are either fully crystallized or made of a glassy matrix with phenocrysts. Combining the experimental results with geochemical mapping, we can identify several mineralogical provinces: the Northern Volcanic Plains and Smooth Plains, dominated by plagioclase, the High-Mg province, strongly dominated by forsterite, and the Intermediate Plains, comprised of forsterite, plagioclase and enstatite. This implies a temporal evolution of the mineralogy from the oldest lavas, dominated by mafic minerals, to the youngest lavas, dominated by plagioclase, consistent with progressive shallowing and decreasing degree of mantle melting over time. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/105870
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Leibniz University Hannover, Institute of Mineralogy, Hannover, Germany; University of Liège, Department of Geology, Sart-Tilman, Belgium
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| Recommended Citation: | |
Namur O.,Charlier B.. Silicate mineralogy at the surface of Mercury[J]. Nature Geoscience,2017-01-01,10(1)
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