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Organics preserved in anhydrous interplanetary dust particles: Pristine or not?

Chan, Queenie H. S.; Franchi, Ian A.; Zhao, Xuchao; Stephant, Alice; Wright, Ian P. and Alexander, Conel M. O'D. (2019). Organics preserved in anhydrous interplanetary dust particles: Pristine or not? Meteoritics & Planetary Science (Early Access).

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The chondritic‐porous subset of interplanetary dust particles (CP‐IDPs) are thought to have a cometary origin. Since the CP‐IDPs are anhydrous and unaltered by aqueous processes that are common to chondritic organic matter (OM), they represent the most pristine material of the solar system. However, the study of IDP OM might be hindered by their further alteration by flash heating during atmospheric entry, and we have limited understanding on how short‐term heating influences their organic content. In order to investigate this problem, five CP‐IDPs were studied for their OM contents, distributions, and isotopic compositions at the submicro‐ to nanoscale levels. The OM contained in the IDPs in this study spans the spectrum from primitive OM to that which has been significantly processed by heat. Similarities in the Raman D bands of the meteoritic and IDP OMs indicate that the overall gain in the sizes of crystalline domains in response to heating is similar. However, the Raman ΓG values of the OM in all of the five IDPs clearly deviate from those of chondritic OM that had been processed during a prolonged episode of parent body heating. Such disparity suggests that the nonaromatic contents of the OM are different. Short duration heating further increases the H/C ratio and reduces the δ13C and δD values of the IDP OM. Our findings suggest that IDP OM contains a significant proportion of disordered C with low H content, such as sp2 olefinic C=C, sp3 C–C, and/or carbonyl contents as bridging material.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1086-9379
Project Funding Details:
Funded Project NameProject IDFunding Body
Astronomy and Planetary Sciences at the Open UniversityST/L000776/1STFC (Science & Technology Facilities Council)
Planetary Science at the Open University 2017-2020ST/P000657/1STFC Science & Technology Facilities Council
Keywords: comochemistry; interplanetary dust particles; organics; comets; meteorites; isotopic composition
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 68204
Depositing User: Queenie Chan
Date Deposited: 21 Nov 2019 09:33
Last Modified: 04 Jul 2020 15:15
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