Silica polymorphs in lunar granite: Implications for granite petrogenesis on the Moon

Seddio, Stephen M.; Korotev, R. L.; Jolliff, Bradley L.; Wang, Alian

doi:10.2138/am-2015-5058

Cited by 36 publications

(53 citation statements)

References 28 publications

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“…The tabular quartz grains, in some places, resemble the “hackle” fracture pattern observed by Seddio et al. () in the Apollo 12 lunar granites (Fig. c), suggesting that they originally crystallized as tridymite or cristobalite and subsequently inverted to quartz.…”

Section: Resultssupporting

confidence: 66%

Dacite formation on Vesta: Partial melting of the eucritic crust

Hahn

Lunning

McSween

et al. 2017

Meteorit & Planetary Scien

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The Dominion Range 2010 howardite pairing group contains an evolved lithic clast of dacite composition. The dacite contains an assemblage of plagioclase, quartz, and augite, with minor pigeonite, troilite, ilmenite, FeNi metal, K-feldspar, and phosphates. Primary augite occurs as >1 mm oikocrysts enclosing plagioclase. Quartz is abundant, comprising approximately 30% of the clast. Textural and geochemical characteristics support the hypothesis that the dacite is a primary igneous lithology, and represents a partial melt of the eucritic crust. Numerical modeling (MELTS) suggests 10-20% partial melting of a Juvinas source could have produced the dacite lithology; quantitative trace element modeling further supports crustal partial melting as the magma source for the dacite. The dacite likely formed as evolved-melt pockets, and thus represents a volumetrically minor lithology in the Vestan crust, although its formation provides direct support for a genetic relationship between Stannern and residual trend eucrites, and is the first identification of residual eucrite complementary melts. We propose the dacite clast is the first characterized sample of tertiary crust on Vesta.

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Section: Resultssupporting

confidence: 66%

Dacite formation on Vesta: Partial melting of the eucritic crust

Hahn

Lunning

McSween

et al. 2017

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…; Seddio et al. ). This is at odds with the observations of embayed, angular, or fractured structures of quartz in NWA 6594 (Figs.…”

Section: Discussionmentioning

confidence: 96%

“…; Seddio et al. ), because tridymite is less dense than quartz. Quartz in NWA 6594 is smooth, without any regular fracture (Figs.…”

Section: Discussionmentioning

confidence: 99%

“…3, 5, and S3). (2) Crystallization or skeletal growth of quartz from tridymite would produce euhedral to subdural crystals with regular edges (Jackson et al 2011;Seddio et al 2015). This is at odds with the observations of embayed, angular, or fractured structures of quartz in NWA 6594 (Figs.…”

Section: Genesis Of Quartzmentioning

confidence: 98%

“…Arguments presented below support a remnant origin, rather than phase transformation from tridymite. (1) If quartz formed by structural inversion of tridymite, hackle fractures or voids caused by molar volume contraction are expected (Jackson et al 2011;Seddio et al 2015), because tridymite is less dense than quartz. Quartz in NWA 6594 is smooth, without any regular fracture (Figs.…”

Section: Genesis Of Quartzmentioning

confidence: 99%

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In situ Pb‐Pb dating of silica‐rich Northwest Africa (NWA) 6594 basaltic eucrite and its constraint on thermal history of the Vestan crust

Liao

Hsu

Wang

et al. 2019

Meteorit & Planetary Scien

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Eucrites represent one of the major lithologies of the Vestan upper crust, which had experienced pervasive and intense thermal metamorphism. To better constrain the timing and mechanism of thermal metamorphism, we carried out in situ Pb‐isotope analysis of an unbrecciated basaltic eucrite NWA 6594 on the basis of detailed mineralogical and petrographic investigations. Zircon Pb‐Pb dating reveals that NWA 6594 emplaced before or at 4547 ± 11 Ma (95% confidence, MSWD = 1.3). Studies of silica minerals indicate that NWA 6594 had experienced intense thermal metamorphism after emplacement, followed by a late impact reheating and rapid cooling. Apatite grains yield a weighted mean Pb‐Pb age of 4523 ± 2 Ma (95% confidence, MSWD = 0.76). This age could not be attributed to slow cooling after the initial crystallization, but most likely related to an independent thermal event that induced thermal metamorphism. The protracted time lag (~24 ± 13 Myr) between zircon and apatite closure ages indicates that this thermal event is most probably induced by an intense impact event that was synchronous with the metal–silicate mixing event recorded by mesosiderites. HEDs may have experienced multiple stages of thermal metamorphism after emplacement. The late impact reheating occurred after thermal metamorphism, which caused crystallization of tridymite.

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Raman and infrared spectroscopic perspectives of lunar meteorite Northwest Africa 4884

Cao

Chen

et al. 2019

J Raman Spectroscopy

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We conducted comprehensive Raman and Fourier transform infrared (FTIR) spectroscopic studies on the whole rock and lithic clasts of Northwest Africa (NWA) 4884 to constrain its igneous mineralogy and metamorphic characteristics. NWA 4884 is composed of mostly clinopyroxene (25.8 vol.%), pigeonite (16.6 vol.%), plagioclase (26.6 vol.%), maskelynite (8.1 vol.%), olivine (20.7 vol.%), minor tridymite (1.0 vol.%), quartz (0.2 vol.%), and ilmenite (0.5 vol.%). Lithic clasts contain mafic rocks including plutonic ultramafic cumulate, olivine gabbro, mare basalt, and feldspathic rocks including noritic anorthosite and impact melt breccia. Raman and FTIR spectroscopic analyses are combined to investigate the shock history of this breccia and revealed that NWA 4884 is highly shocked (17.9–48.1 GPa recorded in plagioclase). The combination of bulk composition and remote sensing data provides possible source regions of NWA 4884: the southern Lacus Veris (20.5°S, 84.5°W) within Orientale basin and the western mare unit (45.3°N, 151.3°E) of Campbell Crater. The pairing relationship among NWA 4884, Yamato 793274, Queen Alexandra Range 94281, and NWA 7611 is supported by their petrographic, mineral, and compositional similarities. Our work demonstrates the potential of Raman and FTIR spectroscopies to shed light on igneous petrology and the bombardment history of the Moon.

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Silica polymorphs in lunar granite: Implications for granite petrogenesis on the Moon

Cited by 36 publications

References 28 publications

Dacite formation on Vesta: Partial melting of the eucritic crust

Dacite formation on Vesta: Partial melting of the eucritic crust

In situ Pb‐Pb dating of silica‐rich Northwest Africa (NWA) 6594 basaltic eucrite and its constraint on thermal history of the Vestan crust

Raman and infrared spectroscopic perspectives of lunar meteorite Northwest Africa 4884

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