DOI: 10.1029/2017JE005461
Scopus记录号: 2-s2.0-85050792467
论文题名: Aqueous Processes From Diverse Hydrous Minerals in the Vicinity of Amazonian-Aged Lyot Crater
作者: Pan L. ; Ehlmann B.L.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 7 起始页码: 1618
结束页码: 1648
语种: 英语
英文关键词: Amazonian climate
; hydrous minerals
; impact cratering
; Mars remote sensing
英文摘要: Amazonian-aged Lyot crater is the best-preserved and deepest peak-ring impact crater (diameter, D = 220 km) in the northern lowlands of Mars. Morphological features including scouring channels emanating from its ejecta and small channels within the crater have been examined previously to understand hydrological activity associated with the crater. In this study, we analyze images acquired by the Compact Reconnaissance Imaging Spectrometer for Mars on board the Mars Reconnaissance Orbiter to investigate the mineralogical record in Lyot and its surroundings, which are presently enriched in ground ice, to understand the associated aqueous processes, their relative timing, and a possible role for ground ice in hydrous mineral formation. We find diverse hydrous minerals, including Fe/Mg phyllosilicates, chlorite, illite/muscovite, and prehnite in Lyot crater walls, central peak, and ejecta, as well as in two craters to the west of Lyot. The exposure and distribution of the hydrous minerals suggest that they are related to the impact process, either exposed by the excavation of hydrothermally altered rocks or formed through syn-depositional hydrothermal alteration immediately after impacts. The Lyot impact induced channel formation to the north, but no mineralogical evidence of aqueous alteration associated with the channels is observed. The sinuous channels within Lyot, diverted by bedrock units with hydrous mineral detections, did not cause mineralization but likely represent the last stage of water activity in Lyot crater. The separate episodes of water activity indicate flow of liquid water on Mars' surface during the Amazonian but limited to no aqueous alteration to generate hydrous minerals. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113550
Appears in Collections: 气候减缓与适应
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作者单位: California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States; Université Claude Bernard Lyon 1, Now at Laboratoire de Geologie de Lyon, Villeurbanne, France; California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA, United States
Recommended Citation:
Pan L.,Ehlmann B.L.. Aqueous Processes From Diverse Hydrous Minerals in the Vicinity of Amazonian-Aged Lyot Crater[J]. Journal of Geophysical Research: Planets,2018-01-01,123(7)