Magnesium isotope systematics in Martian meteorites

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F17%3A00000088" target="_blank" >RIV/00025798:_____/17:00000088 - isvavai.cz</a>

Result on the web

<a href="http://www.sciencedirect.com/science/journal/0012821X?sdc=1" target="_blank" >http://www.sciencedirect.com/science/journal/0012821X?sdc=1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.epsl.2017.07.012" target="_blank" >10.1016/j.epsl.2017.07.012</a>

Result language

angličtina

Original language name

Magnesium isotope systematics in Martian meteorites

Original language description

Magnesium isotope compositions are reported for a suite of Martian meteorites that span the range of petrological and geochemical types recognized for Mars, including crustal breccia NWA 7034. The d26Mg values (per mil units relative to DSM-3 reference material) range from −0.32 to −0.11‰; basaltic shergottites and nakhlites lie to the heavier end of the Mg isotope range whereas olivine-phyric, olivine–orthopyroxene-phyric and lherzolitic shergottites, and chassignites have slightly lighter Mg isotope compositions, attesting to modest correlation of Mg isotopes and petrology of the samples. Slightly heavier Mg isotope compositions found for surface-related materials (NWA 7034, black glass fraction of the Tissint shergottite fall; d26Mg > −0.17‰) indicate measurable Mg isotope difference between the Martian mantle and crust but the true extent of Mg isotope fractionation for Martian surface materials remains unconstrained. The range of d26Mg values from −0.19 to −0.11‰ in nakhlites is most likely due to accumulation of clinopyroxene during petrogenesis rather than garnet fractionation in the source or assimilation of surface material modified at low temperatures. The rather restricted range in Mg isotope compositions between spatially and temporally distinct mantle-derived samples provides evidence for inefficient/absent major tectonic cycles on Mars, which would include plate tectonics and large-scale recycling of isotopically fractionated surface materials back into the Martian mantle. The cumulative d26Mg value of Martian samples, which are not influenced by late-stage alteration and/or crust–mantle interactions, is −0.271 +/- 0.040‰ (2SD) and is considered to reflect d26Mg value of the Bulk Silicate Mars. This value is robust taking into account the range of lithologies involved in this estimate. It also attests to planetary-scale Mg isotope homogeneity in the inner Solar System, noted for several other major elements.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA13-22351S" target="_blank" >GA13-22351S: Combined use of novel and traditional stable isotope systems in identifying source components and processes of moldavite formation</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Earth and Planetary Science Letters

ISSN

0012-821X

e-ISSN

—

Volume of the periodical

474

Issue of the periodical within the volume

September 15

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

419-426

UT code for WoS article

000409150600042

EID of the result in the Scopus database

2-s2.0-85025835133