| DOI: | 10.1002/2014GL062065
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| 论文题名: | Fresh exposures of hydrous Fe-bearing amorphous silicates on Mars |
| 作者: | Weitz C.M.; Bishop J.L.; Baker L.L.; Berman D.C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9471
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| EISSN: | 1944-9202
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| 出版年: | 2014
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| 卷: | 41, 期:24 | | 起始页码: | 8744
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| 结束页码: | 8751
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| 语种: | 英语
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| 英文关键词: | geology
; Mars
; remote sensing
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| Scopus关键词: | Aluminosilicates
; Amorphous materials
; Deposits
; Geology
; Infrared devices
; Remote sensing
; Silicates
; Water content
; Age dating
; Amorphous silicates
; Broad absorptions
; Crater sizes
; Exposure-time
; High water content
; Mars
; Visible and near infrared
; Hydration
; absorption
; allophane
; amorphous medium
; crater
; dehydration
; hydrous mineral
; iron
; Mars
; Martian atmosphere
; silicate
; spectral reflectance
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| 英文摘要: | We have discovered relatively fresh exposures of a hydrated, amorphous material along the wall rock slopes in Coprates Chasma, Mars. Visible and near-infrared reflectance spectra extracted from the deposits exhibit broad absorptions around 1.42, 1.94, and 2.25 μm that are most consistent with laboratory spectra of nanophase hydrated Fe-rich allophane and Fe-rich opal. The three absorptions, especially the 1.4 μm band, have the strongest hydration signatures yet detected on Mars by orbital data, suggesting high-water content material that is relatively fresh and has not altered or lost water since its formation or exposure. Age dating from crater size-frequency distributions of the Fe-rich allophane/opal deposits yields ages of ~50-100 Myr, consistent with a young exposure time and minimal time for dehydration. Either the Fe-rich allophane/opal represents an older material already contained within the wall rock that has been more recently exposed, or it represents a younger material formed during more recent aqueous activity. Key Points We have discovered fresh exposures of a hydrated, amorphous material on MarsThe deposits are most consistent with nanophase hydrated Fe-rich allophane/opalThe hydration bands are much stronger than other Martian spectra ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921752711&doi=10.1002%2f2014GL062065&partnerID=40&md5=e5d376b495d570ab639d87cde9a109b1
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| 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/6735
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Planetary Science Institute, Tucson, AZ, United States
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| Recommended Citation: | |
Weitz C.M.,Bishop J.L.,Baker L.L.,et al. Fresh exposures of hydrous Fe-bearing amorphous silicates on Mars[J]. Geophysical Research Letters,2014-01-01,41(24).
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