Petrogenesis, alteration, and shock history of intermediate shergottite Northwest Africa 7042: Evidence for hydrous magmatism on Mars?

Kizovski, T. V.; Izawa, M. R.M.; Tait, K. T.; Moser, D. E.; Day, J. M.D.; Hyde, B. C.; White, L. F.; Kovarik, L.; Taylor, S. D.; Perea, D. E.; Barker, I. R.; Joy, B. R.

doi:10.1016/j.gca.2020.05.030

Title: Petrogenesis, alteration, and shock history of intermediate shergottite Northwest Africa 7042: Evidence for hydrous magmatism on Mars?

Journal Article · Thu Jun 04 00:00:00 EDT 2020 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2020.05.030· OSTI ID:1639327

^[1]; Izawa, M. R.M. ^[2]; Tait, K. T. ^[1]; Moser, D. E. ^[3];

^[4]; Hyde, B. C. ^[5];

^[1]; Kovarik, L. ^[6];

^[7];

^[6]; Barker, I. R. ^[3]; Joy, B. R. ^[8]

Royal Ontario Museum, Toronto (Canada); University of Toronto, ON (Canada)
Royal Ontario Museum, Toronto (Canada)
University of Western Ontario, London, ON (Canada)
University of California, San Diego, CA (United States). Scripps Institute of Oceanography
Royal Ontario Museum, Toronto (Canada); University of Western Ontario, London, ON (Canada)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Queen's University, Kingston, ON (Canada)

We report Northwest Africa (NWA) 7042 is an intermediate, permafic shergottite consisting of two generations of zoned olivine (early olivine Fo_41-76, and late-stage olivine Fo_46-56), complexly zoned pyroxene (En_35-64Fs_22-46Wo_5-34), maskelynitized feldspar and shock melt (An_5-30Ab_16-61Or_1-47), and accessory merrillite, apatite, ilmenite, titanomagnetite, Fe-Cr-Ti spinels, pyrrhotite, and baddeleyite. The olivine grains have been pervasively altered resulting in orange-brown stained cores with dark-brown margins, surrounded by significantly less altered overgrowth rims. This textural relationship suggests that the alteration of the cores took place at magmatic temperatures prior to crystallization of the rims on Mars. While this type of olivine alteration is rare in shergottites, it is similar to deuterically altered olivine in basalts and gabbros on Earth, caused by residual water-rich magmatic fluids. Launch-generated shock veins in NWA 7042 crosscut and displace several of the altered olivine grains indicating that the alteration occurred before ejection of the meteorite from Mars. However, NWA 7042 has also been subjected to extensive terrestrial weathering, with terrestrial calcite/barite veins occurring throughout the sample. Transmission electron microscopy analysis of the olivine alteration also reveals an absence of high-temperature phases typically associated with hydrous deuteric alteration on Earth, complicating our interpretation. The potential presence of deuterically altered olivine in NWA 7042 has significant implications, as it is the third martian meteorite where deuteric alteration of olivine has been observed (the others being NWA 10416, ALH 77005). The different mantle sources for the parental melts of these three meteorites would suggest many, if not all martian mantle reservoirs have the potential to produce water-rich magmas.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); Natural Sciences and Engineering Research Council of Canada (NSERC); Hatch Foundation; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC05-76RL01830; NNX16AR95G

OSTI ID:: 1639327

Report Number(s):: PNNL-SA-152794

Journal Information:: Geochimica et Cosmochimica Acta, Vol. 283; ISSN 0016-7037

Publisher:: Elsevier; The Geochemical Society; The Meteoritical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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58 GEOSCIENCES
NWA 7042
shergottites
Mars
shock processes
intermediate compositions
alteration
TEM and SEM

Title: Petrogenesis, alteration, and shock history of intermediate shergottite Northwest Africa 7042: Evidence for hydrous magmatism on Mars?

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