The sources of water in Martian meteorites: clues from hydrogen isotopes

Content Provider	Semantic Scholar
Author	Boctor, Nabil Z. Alexander, Conel M. Od. Wang, Jianhua Hauri, Erik H.
Copyright Year	2003
Abstract	H isotope measurements of carbonate, phosphate, feldspathic and mafic glasses, and post- stishovite silica phase in the shergottites Zagami, Shergotty, SaU 005, DaG 476, ALHA 77005 and EETA 79001, as well as in Chassigny and ALH 84001, show that all these phases contain deuterium-enriched water of extraterrestrial origin. The minerals and glasses analyzed may contain an initial primary hydrogen component, but their isotopic composition was modified to varying degrees by three different processes: interaction with a fractionated exchangeable water reservoir on Mars, hydrogen devolatilization by impact melting, and terrestrial contamination. Positive correlations between D and water abundance in feldspathic glass and post-stishovite silica in Zagami, Shergotty, and SaU 005 is indicative of mixing of a high D component (3000 - 4000‰) and a less abundant, low D component (0‰). The high D component is primarily derived from the Martian exchangable reservoir, but may also have been influenced by isotopic fractionation associated with shock-induced hydrogen loss. The low D component is either a terrestrial contaminant or a primary "magmatic" component. The negative correlation betweenD and water abundances in mafic and feldspathic glasses in ALH 84001, ALHA 77005, and EETA 79001 is consistent with the addition of a low D terrestrial contaminant to a less abundant high-deuterium Martian component. The low Do f magmatic glass in melt inclusions suggests that the D of Martian parent magma was low and that the initial H isotope signature of Mars may be similar to that of Earth. Copyright © 2003 Elsevier Ltd
Starting Page	3971
Ending Page	3989
Page Count	19
File Format	PDF HTM / HTML
Volume Number	67
Alternate Webpage(s)	http://home.dtm.ciw.edu/users/jianhua/Papers/MartianMeteoGCA2003.pdf
Alternate Webpage(s)	https://doi.org/10.1016/S0016-7037%2803%2900234-5
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article