Implications of Bimodal Olivine Compositions in VHK Basalts

Gawronska, A. J.; Cronberger, K.; Neal, C. R.

doi:10.1130/abs/2018nc-313048

Cited by 1 publication

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“…ударного расплава через оливинсодержащую породу. Подобный процесс был предложен для объяснения структуры и состава очень высококалиевых базальтов «Apollo-14» (Gawronska et al, 2018). В качестве альтернативы могут быть предложены метасоматические процессы с участием газовой фазы, которые, согласно последним изотопным данным, были предположительно распространены на видимой стороне Луны 4 млрд лет назад (Potts et al, 2018).…”

Section: источники фосфорсодержащих оливинов в лунном веществеunclassified

P-bearing olivines of lunar rocks: sources and localization in the lunar crust

Demidovaa

Demidova²,

Аносова

et al. 2019

Геохимия

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Fragments of P-bearing olivine have been studied in lunar highland, mare and mingled meteorites and in «Apollo-14», «Luna-16, -20, -24» lunar samples. Olivine contains up to 0.5 wt.% P2O5 and has variable MG# number. It is associated with anorthite, pyroxene and accessory spinel group minerals, Ti and Zr oxides, phosphates, troilite and Fe-Ni metal. Three possible sources of P-bearing olivine were found in lunar material: 1) highland anorthositic-noritic-troctolitic rocks enriched in incompatible elements and thought to be related to high-Mg suite rocks: 2) late-stage products of mare basalts crystallization; 3) unusual olivine-orthopyroxene intergrowths either of meteoritic or lunar origin. Enrichment in incompatible elements may be resulted from both crystallization processes (source 2) and KREEP assimilation (sources 1 and 3). However following metasomatic processes can lead to some addition of phosphorus and other elements. The rarity of P-bearing olivines points either to the low abundance or local distribution of their sources in the lunar crust. Association with mare basalts specifies the highland-mare boundary. The presence of the evolved rocks in the studied breccias suggests possible connection of some sources with recently discovered granitic domes in Procellarum Ocean. That means the P-bearing sources are mainly localized on the visible side of the Moon.

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Section: источники фосфорсодержащих оливинов в лунном веществеunclassified