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Survivability of 1-chloronapthalene during simulated early diagenesis – Implications for chlorinated hydrocarbon detection on Mars

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Title: Survivability of 1-chloronapthalene during simulated early diagenesis – Implications for chlorinated hydrocarbon detection on Mars
Authors: Royle, SH
Tan, J
Kounaves, SP
Sephton, M
Item Type: Journal Article
Abstract: All missions to Mars which have attempted to detect organic molecules have detected simple chlorohydrocarbons, the source of which has yet to be firmly established. This study assessed the likelihood of these chlorinated molecules being indigenous to the sedimentary units in which they were detected or if they were chlorinated during analysis. The survivability of 1-chloronapthalene was examined via hydrous pyrolysis experiments and its de-chlorination kinetics were determined. The results of these experiments were used to model the survivability of this simple chlorohydrocarbon under Mars-relevant diagenetic conditions using the Sheepbed mudstone unit as a case study. It was found that 1-chloronapthalene was rapidly dechlorinated under Noachian conditions and thus the detected Martian chlorohydrocarbons are unlikely to be ancient and probably formed within the rover’s sample handling chain during analysis.
Issue Date: 29-Oct-2018
Date of Acceptance: 5-Oct-2018
URI: http://hdl.handle.net/10044/1/65297
DOI: https://dx.doi.org/10.1029/2018JE005711
ISSN: 2169-9097
Publisher: American Geophysical Union
Start Page: 2790
End Page: 2802
Journal / Book Title: Journal of Geophysical Research: Planets
Volume: 123
Issue: 10
Copyright Statement: ©2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/N000560/1
Keywords: Science & Technology
Physical Sciences
Geochemistry & Geophysics
Mars
organic geochemistry
chlorohydrocarbon
diagenesis
hydrous pyrolysis
perchlorate
GALE CRATER
ORGANIC-MATTER
HYDROUS PYROLYSIS
YELLOWKNIFE BAY
THERMAL-STABILITY
MASS-SPECTROMETRY
CURIOSITY ROVER
MARTIAN SOIL
PERCHLORATE
ORIGIN
Publication Status: Published
Online Publication Date: 2018-10-11
Appears in Collections:Earth Science and Engineering
Faculty of Engineering