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Formation Mechanism of Iron-Rich Olivine: Experimental Constrains into Early Fluid-Assisted Hydration and Dehydration Processes on AsteroidsIron-rich olivine is one of the major minerals in the matrices of unequilibrated ordinary (UOCs) and carbonaceous (CV, CK, CO) chondrites whose petrologic type is >3.1. There has been an extensive discussion in the literature as to the formation mechanism of these olivines; however, their origin is poorly understood. The formation of ferroan olivine during hydrothermal alteration has been demonstrated to be thermodynamically viable. The stability of ferroan olivine is highly dependent on several variables, including temperature, water/ rock (W/R) ratio, pressure, oxygen fugacity, and bulk rock composition. So far, hydrothermal alteration experiments have not been successful at forming FeO-rich olivines with the compositions and textures observed in the matrices of chondrites. Therefore, understanding the formation conditions of FeO-rich olivines remains a key problem to explain the effects of hydrothermal alteration on chondrite matrices.
Document ID
20190019120
Acquisition Source
Goddard Space Flight Center
Document Type
Abstract
External Source(s)
Authors
Dobrică, E.
(New Mexico Univ. Albuquerque, NM, United States)
Nuth, J. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brearley, A. J.
(New Mexico Univ. Albuquerque, NM, United States)
Date Acquired
May 10, 2019
Publication Date
July 6, 2017
Publication Information
Publication: 80th Annual Meeting of the Meteoritical Society (2017): Abstracts
Publisher: Wiley
Volume: 52
Issue: S1
ISSN: 1086-9379
e-ISSN: 1945-5100
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
GSFC-E-DAA-TN53264
Meeting Information
Meeting: Annual Meeting of the Meteoritical Society
Location: Santa Fe, NM
Country: United States
Start Date: July 23, 2017
End Date: July 28, 2017
Sponsors: Meteoritical Society
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Technical Review
Single Expert
Keywords
Iron-rich olivine
Minerals
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