globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.08.016
Scopus记录号: 2-s2.0-85052749438
论文题名:
Context matters – Ar–Ar results from in and around the Manicouagan Impact Structure, Canada: Implications for martian meteorite chronology
作者: Jaret S.J.; Hemming S.R.; Rasbury E.T.; Thompson L.M.; Glotch T.D.; Ramezani J.; Spray J.G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501
起始页码: 78
结束页码: 89
语种: 英语
英文关键词: argon geochronology ; impact cratering ; martian meteorites ; maskelynite ; shock metamorphism
Scopus关键词: Argon ; Feldspar ; Geochronology ; Meteorites ; Structural geology ; Argon geochronology ; Impact cratering ; Martian meteorites ; maskelynite ; shock metamorphism ; Meteor impacts ; argon-argon dating ; crater ; geochronology ; impact structure ; Martian meteorite ; metamorphism ; plagioclase ; shergottite ; Canada ; Manicouagan ; Quebec [Canada]
英文摘要: As an analog for interpretations of the ages of martian shergottite meteorites, we have conducted an argon isotopic study of plagioclase feldspars exhibiting varying levels of shock from in and around the Manicouagan impact structure, Canada. Plagioclase from the impact melt sheet at Manicouagan yields an age of 215.40 ± 0.16 Ma, which indicates the time of impact. Plagioclase from a clast within melt-bearing breccias of the melt sheet and a hornfels adjacent to the melt sheet yield ages of 216 ± 3 Ma and 218 ± 7 Ma, respectively, which are interpreted to have been reset by contact metamorphism from the impact melt. Country rocks that were unaffected by the impact gives ∼849 Ma ages, consistent with the known Grenvillian target rock history. Maskelynite (amorphous plagioclase, which has been transformed in the solid state) yields an age of 567 ± 6 Ma. This age is geologically meaningless because it is not consistent with the target age, the impact age, or regional metamorphic ages at Manicouagan. Our results show that maskelynite argon ages are not meaningful, and that context is critical for proper interpretation of impact-affected argon ages. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109675
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, United States; Lamont-Doherty Earth Observatory, Palisades, NY 10964, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, United States; Planetary and Space Science Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

Recommended Citation:
Jaret S.J.,Hemming S.R.,Rasbury E.T.,et al. Context matters – Ar–Ar results from in and around the Manicouagan Impact Structure, Canada: Implications for martian meteorite chronology[J]. Earth and Planetary Science Letters,2018-01-01,501
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