2019
DOI: 10.2138/am-2019-6652
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Spinel-anorthosites on the Moon: Impact melt origins suggested by enthalpy constraints

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Cited by 16 publications
(17 citation statements)
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“…(2014), and Treiman et al. (2019) demonstrated in the Forsterite‐Anorthosite‐SiO 2 ternary and Forsterite‐Anorthite binary systems that assimilation of anorthositic wall rock by an olivine‐saturated melt could produce melts in the spinel stability field. These melts would have a crystallization sequence of spinel ⇒ spinel + plagioclase ⇒ spinel + melt react to plagioclase + olivine ⇒ plagioclase + olivine ⇒ olivine + melt reacts to plagioclase + low‐Ca pyroxene.…”
Section: Discussionmentioning
confidence: 99%
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“…(2014), and Treiman et al. (2019) demonstrated in the Forsterite‐Anorthosite‐SiO 2 ternary and Forsterite‐Anorthite binary systems that assimilation of anorthositic wall rock by an olivine‐saturated melt could produce melts in the spinel stability field. These melts would have a crystallization sequence of spinel ⇒ spinel + plagioclase ⇒ spinel + melt react to plagioclase + olivine ⇒ plagioclase + olivine ⇒ olivine + melt reacts to plagioclase + low‐Ca pyroxene.…”
Section: Discussionmentioning
confidence: 99%
“…This has been demonstrated to be a favorable process to account for observations of magmatic rocks with high spinel contents (e.g., pink-spinel anorthosites, ALHA 81005), but is it appropriate for these shallow spinel troctolites? Gross and Treiman (2011), and Treiman et al (2019 demonstrated in the Forsterite-Anorthosite-SiO 2 ternary and Forsterite-Anorthite binary systems that assimilation of anorthositic wall rock by an olivine-saturated melt could produce melts in the spinel stability field. These melts would have a crystallization sequence of spinel ⇒ spinel + plagioclase ⇒ spinel + melt react to plagioclase + olivine ⇒ plagioclase + olivine ⇒ olivine + melt reacts to plagioclase + low-Ca pyroxene.…”
Section: Origin Of the Spinel-bearing Magmatic Lithologiesmentioning
confidence: 99%
“…Treiman et al. () recently indicated that magnesium aluminate spinel on the walls and central peaks of impact craters results from rapid cooling and partial crystallization of superliquidus melts produced in the impacts by enthalpy constraints. Our experiments indicate that spinel (albeit of a more Fe‐rich composition) can also be a product of LMO crystallization if water was present.…”
Section: Discussionmentioning
confidence: 99%
“…Experiments have shown that such Mg-rich spinel likely formed through the interaction between Mg suite parent magma and anorthositic crust (i.e., during processes that occurred after completion of LMO solidification, Prissel et al 2014;Williams et al 2016). Treiman et al (2019) recently indicated that magnesium aluminate spinel on the walls and central peaks of impact craters results from rapid cooling and partial crystallization of superliquidus melts produced in the impacts by enthalpy constraints. Our experiments indicate that spinel (albeit of a more Fe-rich composition) can also be a product of LMO crystallization if water was present.…”
Section: Comparison With a Nominally Dry Moonmentioning
confidence: 99%
“…Since the first discovery of spinel-bearing clasts in Apollo samples, scientists have explored their formation, but have not formed an unified opinion (Gross et al, 2014 and references therein). The petrological characteristics and computational results of the isothermal, isobaric phase diagrams of enthalpy versus composition support recrystallization from impact melts (Treiman et al, 2015). Similarly, impact melting has been suggested as the mode of formation of fine-grained, glassy melt breccias in Dho 1528 and GRA 06157 that contain <10 -20 μm spinel phenocrysts (Wittmann et al, 2019).…”
Section: Formation Of Spinel-bearing Clasts In Nwa 13191mentioning
confidence: 75%