Shock-Induced Olivine-Ringwoodite Transformation in the Shock Vein of Chondrite GRV053584

Yin, Feng; Liao, Zhiwei; Hursthouse, Andrew; Dang, Dai

doi:10.3390/min8040139

Cited by 5 publications

(3 citation statements)

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“…In ordinary chondrites, wadsleyite and ringwoodite aggregates have been typically found within and/or in the surrounding of the shock features (Chen et al 2004;Yin et al 2018;Miyahara et al 2020), and ringwoodite has been also found in association with ferropericlase (Chen et al 1996).…”

Section: Discussionmentioning

confidence: 99%

Apollo 15 regolith breccia provides first natural evidence for olivine incongruent melting

Satta,

Miyahara,

Ozawa

et al. 2022

American Mineralogist

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The Apollo 15 mission has returned various samples of regolith breccias to the Earth -typical lunar rocks lithified by impact events on the Moon's surface. Here we report our observations on shock features recorded in a section of the Apollo Sample 15299. We observe the presence of ferropericlase crystals confined in a shock melt pocket and conclude that their formation is related to a shock-induced incongruent melting of olivine. While predicted by experiments, this phenomenon has never been observed in a natural sample. The incongruent melting of olivine provides an important signature of melting under high-pressure conditions, and allows for estimating the pressure (P)-temperature (T) experienced by the studied sample during the impact event. We infer that the fracture porosity that likely characterized the studied sample prior to the This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Discussionmentioning

confidence: 99%

Apollo 15 regolith breccia provides first natural evidence for olivine incongruent melting

Satta,

Miyahara,

Ozawa

et al. 2022

American Mineralogist

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“…In terms of chemical compositions, some ringwoodite lamellae and polycrystalline grains have almost identical compositions to the original olivine, indicating an interface-controlled growth process (Xie and Sharp 2007;Mosenfelder et al 2001;Ohtani et al 2004;Chen et al 1996) in which the growth of ringwoodite is controlled by the rate of short range diffusion across the interface between the two phases (Sharp and De Carli 2006). Some polycrystalline ringwoodite rims surrounding the olivine show a Fe-Mg diffusion-controlled growth process (Walton and McCarthy 2017;Yin et al 2018;Pittarello et al 2015) with Fe preferentially partitioned to ringwoodite, leading to a higher FeO content of ringwoodite compared with the residual olivine.…”

Section: Introductionmentioning

confidence: 99%

Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705

Zhang

Wang

et al. 2021

Earth Planets Space

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Ringwoodite and wadsleyite are the high-pressure polymorphs of olivine, which are common in shocked meteorites. They are the major constituent minerals in the terrestrial mantle. NWA 8705, an olivine-phyric shergottite, was heavily shocked, producing shock-induced melt veins and pockets associated with four occurrences of ringwoodite: (1) the lamellae intergrown with the host olivine adjacent to a shock-induced melt pocket; (2) polycrystalline assemblages preserving the shapes and compositions of the pre-existing olivine within a shock-induced melt vein (60 μm in width); (3) the rod-like grains coexisting with wadsleyite and clinopyroxene within a shock-induced melt vein; (4) the microlite clusters embedded in silicate glass within a very thin shock-induced melt vein (20 μm in width). The first two occurrences of ringwoodite likely formed via solid-state transformation from olivine, supported by their morphological features and homogeneous compositions (Mg# 64–62) similar to the host olivine (Mg# 66–64). The third occurrence of ringwoodite might fractionally crystallize from the shock-induced melt, based on its heterogeneous and more FeO-enriched compositions (Mg# 76–51) than those of the coexisting wadsleyite (Mg# 77–67) and the host olivine (Mg# 66–64) of this meteorite. The coexistence of ringwoodite, wadsleyite, and clinopyroxene suggests a post-shock pressure of 14–16 GPa and a temperature of 1650–1750 °C. The fourth occurrence of ringwoodite with compositional variation (Mg# 72–58) likely crystallized from melt at 16–18 GPa and 1750–1850 °C. The presence of the four occurrences of ringwoodite was probably due to their very fast cooling rates in and/or adjacent to the thin shock-induced melt veins and small pockets. In addition, the higher Fa-contents of the host olivine (Fa35–39) in NWA 8705 than those in ordinary chondrites (Fa16–32) makes the olivine–ringwoodite transformation prolong to a lower pressure.

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“…The high temperature and high pressure induced by an impact event can cause special deformation features in rocks and minerals, known as shock metamorphism [3]. Shock features of feldspar have been observed in impactites from impact craters on Earth [4,5], ordinary chondrites [6,7], as well as Vesta [8], Lunar [9] and Martian [10] meteorites. The currently known shock-metamorphic features in natural feldspar include irregular fractures and planar fractures [5], undulatory extinction and mosaicism [11], planar deformation features (PDFs) [12], diaplectic glass (sometimes called maskelynite) [4,13], vesicular glass [14], lingunite [15], and decomposition [16].…”

Section: Introductionmentioning

confidence: 99%

A Study of Shock-Metamorphic Features of Feldspars from the Xiuyan Impact Crater

Yin

Dang

2020

Minerals

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Feldspar is the most abundant mineral in the Earth's crust and is widely distributed in rocks. It is also one of the most common minerals in meteorites. Shock-metamorphic features in feldspar are widely used to calibrate the temperature and pressure of shock events and can also provide clues for searching for impact craters on Earth. In this study, shocked alkali feldspars in the lithic breccia and suevite from Xiuyan Impact Crater were investigated using polarizing optical microscopes, Raman spectroscopy and electron microprobes to better constrain the shock history of this crater. For this study, feldspar grains occurring in gneiss clasts in the impact breccia and four shock stages were identified, e.g., weakly shocked feldspar, moderately shocked feldspar, strongly shocked feldspar, and whole rock melting. According to the shock classification system for alkali feldspar and felsic rocks, we estimated the shock pressure (SP) and post-shock temperature (PST) histories of these gneiss clasts. Weakly shocked feldspars display irregular fractures and undulatory extinction, and their shock stage is F-S2, which indicates that SP and PST are from~5 to~14 GPa and~100 • C, respectively. Moderately shocked feldspars show planar deformation features and are partially transformed into diaplectic glass, which indicates that the F-S5 shock stage of SP and PST is from~32 to~45 GPa and 300-900 • C. Strongly shocked feldspars that occur as vesicular glass indicate a shock stage of F-S6, and the SP and PST are 45-60 GPa and 900-1500 • C, respectively. The whole felsic rock melting occurs as mixed melt glass clast and belongs to the F-S7 stage, and SP and PST are >60 GPa and >1500 • C, respectively.The Xiuyan crater is a simple impact crater located in northeast China with a diameter of 1800 m, which was formed 50,000 years ago [17]. The basement rocks in the impact crater area are crystalline rocks composed of gneiss, granulite, and amphibolite, as well as minor basalt and marble. A drill hole at the center of the Xiuyan crater reveals that the crater contains a loosely consolidated impact breccia lens with a center thickness of about 188 m, which is underlain by 107-m-thick lacustrine sediments [17]. The upper part of the 153 m thick part of the impact breccia lens consists of gneiss, amphibolite, basalt, and marble fragments as well as a small amount of lithic breccia, whereas the lower 35 m thick part of the impact breccia lens is composed of gneiss, granulite and amphibolite fragments and small amount of melt-bearing breccia (suevite).So far, a variety of high-pressure minerals have been found in the suevite from the Xiuyan crater, such as coesite [14], reidite [18], TiO 2 -II [19], diamond [20], and maohokite [21]. This study focuses on the shock-metamorphic features of feldspar in impact breccias from the Xiuyan crater, and we try to reveal the shock histories of these feldspars.

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Shock-Induced Olivine-Ringwoodite Transformation in the Shock Vein of Chondrite GRV053584

Cited by 5 publications

References 49 publications

Apollo 15 regolith breccia provides first natural evidence for olivine incongruent melting

Apollo 15 regolith breccia provides first natural evidence for olivine incongruent melting

Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705

A Study of Shock-Metamorphic Features of Feldspars from the Xiuyan Impact Crater

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