DOI: 10.1002/grl.50255
论文题名: Large mineralogically distinct impact melt feature at Copernicus crater-Evidence for retention of compositional heterogeneity
作者: Dhingra D. ; Pieters C.M. ; Head J.W. ; Isaacson P.J.
刊名: Geophysical Research Letters
ISSN: 0094-9227
EISSN: 1944-8958
出版年: 2013
卷: 40, 期: 6 起始页码: 1043
结束页码: 1048
语种: 英语
英文关键词: Copernicus crater
; impact melt
; lunar spectroscopy
; Moon Mineralogy Mapper
Scopus关键词: Complex craters
; Compositional heterogeneity
; Copernicus crater
; Impact melt
; Keypoints
; Melt mixing
; Short-wavelength
; Crystallography
; Deposits
; Mineralogy
; Mixing
; Silicate minerals
; Moon
; absorption
; alkene
; chemical composition
; heterogeneity
; lunar soil
; magnesium
; melting
; mineralogy
; spectral analysis
; spectroscopy
; wavelength
英文摘要: Despite several lines of evidence for efficient mixing of impact melt in complex craters, we document mineralogical heterogeneity in impact melt deposit on a scale of tens of kilometers on the Moon in the 96 km-diameter Copernicus crater. This heterogeneity is in the form of a large, sinuous impact melt feature on the floor and northern wall that is spectrally distinct from melt in its immediate vicinity. This melt feature spanning >30 km in length and 0.5-5 km in width has relatively short-wavelength, narrow ferrous absorption bands near ~900 nm and ~2000 nm indicating a more Mg-rich pyroxene composition as compared to impact melt deposit in the vicinity which is relatively rich in Fe/Ca-pyroxenes. This distinction provides evidence for the preservation of compositional heterogeneity in impact melt in complex craters on the Moon and documents an example of inefficient mixing of melt during the cratering process. Key Points Mineralogically distinct impact melt feature is observed at Copernicus crater Inefficient melt mixing is evident from heterogeneous melt mineralogy Melt deposit can retain important information about target heterogeneity. ©2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876930912&doi=10.1002%2fgrl.50255&partnerID=40&md5=b5b758f492ea0238949db5aa2da80625
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6491
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, Brown University, RI 02912, United States
Recommended Citation:
Dhingra D.,Pieters C.M.,Head J.W.,et al. Large mineralogically distinct impact melt feature at Copernicus crater-Evidence for retention of compositional heterogeneity[J]. Geophysical Research Letters,2013-01-01,40(6).