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Tomoaki Morishita - One of the best experts on this subject based on the ideXlab platform.
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Possible Non-melted Remnants of Subducted Lithosphere: Experimental and Geochemical Evidence from Corundum-Bearing Mafic Rocks in the Horoman Peridotite Complex, Japan
Journal of Petrology, 2004Co-Authors: Tomoaki Morishita, Shoji Arai, David H GreenAbstract:. Morishita, T. & Arai, S. (2001). Petrogenesis of corundum-Bearing mafic rock in the Horoman Peridotite Complex, Japan. Journal of Petrology 42, 1279---1299. Morishita, T. & Kodera, T. (1998). Finding of corundum-Bearing gabbro boulder possibly derived from the Horoman Peridotite Complex, Hokkaido, northern Japan. Journal of Mineralogy, Petrology and Economic Geology 93, 52---63. Morishita, T., Arai, S. & Gervilla, F. (2001). High-pressure aluminous mafic rocks from the Ronda peridotite massif, southern Spain: significance of sapphirineand corundum-Bearing Mineral assemblages. Lithos 57, 143---161. Morishita, T., Arai, S. & Green, D. H. (2003a). Evolution of low-Al orthopyroxene in the Horoman peridotite, Japan: an unusual indicator of metasomatising fluids. Journal of Petrology 44,
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High-pressure aluminous mafic rocks from the Ronda peridotite massif, southern Spain: significance of sapphirine- and corundum-Bearing Mineral assemblages
Lithos, 2001Co-Authors: Tomoaki Morishita, Shoji Arai, Fernando GervillaAbstract:We firstly present detailed microtextural relationships in sapphirine- and corundum-Bearing aluminous mafic rocks alternating with peridotites from the Ronda massif, southern Spain. Garnet and clinopyroxene are the main phases in the aluminous mafic rocks. Garnet is partially to completely kelyphitized. Clinopyroxene (CPX I) has high Al2O3 content in the core (up to 16 wt.%) and is partially converted to spherical symplectitic aggregates consisting of lower-Al2O3 clinopyroxene (CPX II) (
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high pressure aluminous mafic rocks from the ronda peridotite massif southern spain significance of sapphirine and corundum Bearing Mineral assemblages
Lithos, 2001Co-Authors: Shoji Arai, Tomoaki Morishita, Fernando GervillaAbstract:We firstly present detailed microtextural relationships in sapphirine- and corundum-Bearing aluminous mafic rocks alternating with peridotites from the Ronda massif, southern Spain. Garnet and clinopyroxene are the main phases in the aluminous mafic rocks. Garnet is partially to completely kelyphitized. Clinopyroxene (CPX I) has high Al2O3 content in the core (up to 16 wt.%) and is partially converted to spherical symplectitic aggregates consisting of lower-Al2O3 clinopyroxene (CPX II) (<5 wt.%) and plagioclase. Corundum is associated with spinel and plagioclase. Sapphirine occurs in two different Mineralogical associations, i.e., as elongated lamellae within CPX I and as very fine-grained crystals in plagioclase-rich domain. The sapphirine+plagioclase aggregate suggests the former presence of kyanite as one of reactants. Sapphirine is partially converted to symplectitic aggregate of spinel and plagioclase. The earliest metamorphic Mineral assemblage recorded in the aluminous mafic rock was garnet+clinopyroxene±kyanite±corundum, i.e., eclogitic Mineral assemblages, at P≥1.5 GPa and T≥900°C. Many reaction textures were developed during decompression possibly coupled with cooling. The latest P–T conditions recorded in the aluminous mafic rock were at P=1 GPa and T=800–900°C. This decompression had possibly followed the compression of plagioclase-rich, low-pressure cumulate or residue.
Fernando Gervilla - One of the best experts on this subject based on the ideXlab platform.
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High-pressure aluminous mafic rocks from the Ronda peridotite massif, southern Spain: significance of sapphirine- and corundum-Bearing Mineral assemblages
Lithos, 2001Co-Authors: Tomoaki Morishita, Shoji Arai, Fernando GervillaAbstract:We firstly present detailed microtextural relationships in sapphirine- and corundum-Bearing aluminous mafic rocks alternating with peridotites from the Ronda massif, southern Spain. Garnet and clinopyroxene are the main phases in the aluminous mafic rocks. Garnet is partially to completely kelyphitized. Clinopyroxene (CPX I) has high Al2O3 content in the core (up to 16 wt.%) and is partially converted to spherical symplectitic aggregates consisting of lower-Al2O3 clinopyroxene (CPX II) (
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high pressure aluminous mafic rocks from the ronda peridotite massif southern spain significance of sapphirine and corundum Bearing Mineral assemblages
Lithos, 2001Co-Authors: Shoji Arai, Tomoaki Morishita, Fernando GervillaAbstract:We firstly present detailed microtextural relationships in sapphirine- and corundum-Bearing aluminous mafic rocks alternating with peridotites from the Ronda massif, southern Spain. Garnet and clinopyroxene are the main phases in the aluminous mafic rocks. Garnet is partially to completely kelyphitized. Clinopyroxene (CPX I) has high Al2O3 content in the core (up to 16 wt.%) and is partially converted to spherical symplectitic aggregates consisting of lower-Al2O3 clinopyroxene (CPX II) (<5 wt.%) and plagioclase. Corundum is associated with spinel and plagioclase. Sapphirine occurs in two different Mineralogical associations, i.e., as elongated lamellae within CPX I and as very fine-grained crystals in plagioclase-rich domain. The sapphirine+plagioclase aggregate suggests the former presence of kyanite as one of reactants. Sapphirine is partially converted to symplectitic aggregate of spinel and plagioclase. The earliest metamorphic Mineral assemblage recorded in the aluminous mafic rock was garnet+clinopyroxene±kyanite±corundum, i.e., eclogitic Mineral assemblages, at P≥1.5 GPa and T≥900°C. Many reaction textures were developed during decompression possibly coupled with cooling. The latest P–T conditions recorded in the aluminous mafic rock were at P=1 GPa and T=800–900°C. This decompression had possibly followed the compression of plagioclase-rich, low-pressure cumulate or residue.
Shuai Wang - One of the best experts on this subject based on the ideXlab platform.
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removal of magnesium and calcium from electric furnace titanium slag by h3po4 oxidation roasting leaching process
Transactions of Nonferrous Metals Society of China, 2018Co-Authors: Fuqiang Zheng, Tao Jiang, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Feng Chen, Shuai WangAbstract:Abstract H3PO4 oxidation roasting followed by HCl acid leaching was proposed to remove magnesium and calcium from electric furnace titanium slag containing 3.12% MgO and 0.86% CaO. XRF, XRD and SEM techniques were used to characterize the composition, Mineral phase component and microstructure of the titanium slag. The H3PO4 oxidation thermodynamic, Mineral phase transformation, microstructure, element distribution in titanium slag during H3PO4 oxidation process and leaching process were investigated. The thermodynamic analysis indicated that H3PO4 could promote the decomposition of MgTi2O5 and CaSiO3. The results indicated that H3PO4 could effectively promote the transformation of titanium-Bearing Mineral to rutile and enrich the impurities in MxTi3–xO5 into phosphate which could be removed by acid leaching process. Under the studied conditions, the leaching rates of magnesium and calcium reached 94.68% and 87.19%, respectively. The acid leached slag containing 0.19% MgO and 0.13% CaO (mass fraction) was obtained.
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transformation of ti Bearing Mineral in panzhihua electric furnace titanium slag during oxidation roasting process
Journal of Thermal Analysis and Calorimetry, 2018Co-Authors: Fuqiang Zheng, Tao Jiang, Yufeng Guo, Shuishi Liu, Guanzhou Qiu, Feng Chen, Wenting Duan, Shuai WangAbstract:The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-Bearing Minerals and iron-Bearing Mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the Mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-Bearing Mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the Mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.
Frédéric Moynier - One of the best experts on this subject based on the ideXlab platform.
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Unusual neon isotopic composition in Neoproterozoic sedimentary rocks: Fluorine Bearing Mineral contribution or trace of an impact event?
Chemical Geology, 2019Co-Authors: Deborah Chavrit, Manuel Moreira, David Fike, Frédéric MoynierAbstract:Extraterrestrial materials have He and Ne isotopic compositions that are distinct from those of the Earth's surface. In order to track the extraterrestrial material accreted onto Earth during the Ediacaran period, we have analyzed the He and Ne isotopic composition of thirteen sedimentary rocks in the age range similar to 550-600 Ma, coming from the Huqf supergroup in Oman for which carbon and sulfur isotopic data have been characterized previously. He-3/He-4 ratios range between 0.006 +/- 0.003 and 0.27 +/- 0.01 RA, with RA being the atmospheric ratio. He-3/He-4 ratios show a positive relationship with He-3 contents ranging between 0.6 and 31x10(-13) cm(3) STP.g(-1). The He-3 contents are within the literature data for 3 to 480 Myr old samples with evidence of IDP 3He (IDP for interplanetary dust particles), suggesting that extraterrestrial He-3 is still retained in such old samples. Ne-20/Ne-22 ratios are close to or below the modern atmospheric ratio of 9.8 with the minimum value equal to 9.05 +/- 0.03. Ne-21/Ne-22 ratios show a high range of variation, going from 0.0345 +/- 0.0009 to 0.0935 +/- 0.0023. The Ne isotopic compositions follow a nucleogenic trend similar to that of crustal fluids from the literature and predicted continental crust. However, one sample (3404) shows an unusual Ne isotopic composition with a lower Ne-20/Ne-22 at similar Ne-21/Ne-22 compared to the other samples. Two hypotheses can explain this singular Ne isotopic composition. First, it could be the result of a particular nucleogenic trend due to the presence of F-Bearing Minerals in this sample. SEM-EDS elemental mapping showed that although F-and Ca-rich phases, which could correspond to fluorites, are present in sample 3404. However, their abundance of similar to 0.15% seems too low to explain the unusual Ne isotopic composition. However, due to the high uncertainty of the calculations, we cannot totally rule out this hypothesis. Alternatively, the singular Ne isotopic composition could be due to the presence of a Ne-A component, a component characterizing pre-solar diamonds contained in chondrites. This would indicate that a major object impacted the Earth at the time the sediment was forming, between similar to 600 and similar to 550 Ma, which is coherent with the estimated age range of the Acraman impact in Australia.
Shoji Arai - One of the best experts on this subject based on the ideXlab platform.
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Possible Non-melted Remnants of Subducted Lithosphere: Experimental and Geochemical Evidence from Corundum-Bearing Mafic Rocks in the Horoman Peridotite Complex, Japan
Journal of Petrology, 2004Co-Authors: Tomoaki Morishita, Shoji Arai, David H GreenAbstract:. Morishita, T. & Arai, S. (2001). Petrogenesis of corundum-Bearing mafic rock in the Horoman Peridotite Complex, Japan. Journal of Petrology 42, 1279---1299. Morishita, T. & Kodera, T. (1998). Finding of corundum-Bearing gabbro boulder possibly derived from the Horoman Peridotite Complex, Hokkaido, northern Japan. Journal of Mineralogy, Petrology and Economic Geology 93, 52---63. Morishita, T., Arai, S. & Gervilla, F. (2001). High-pressure aluminous mafic rocks from the Ronda peridotite massif, southern Spain: significance of sapphirineand corundum-Bearing Mineral assemblages. Lithos 57, 143---161. Morishita, T., Arai, S. & Green, D. H. (2003a). Evolution of low-Al orthopyroxene in the Horoman peridotite, Japan: an unusual indicator of metasomatising fluids. Journal of Petrology 44,
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High-pressure aluminous mafic rocks from the Ronda peridotite massif, southern Spain: significance of sapphirine- and corundum-Bearing Mineral assemblages
Lithos, 2001Co-Authors: Tomoaki Morishita, Shoji Arai, Fernando GervillaAbstract:We firstly present detailed microtextural relationships in sapphirine- and corundum-Bearing aluminous mafic rocks alternating with peridotites from the Ronda massif, southern Spain. Garnet and clinopyroxene are the main phases in the aluminous mafic rocks. Garnet is partially to completely kelyphitized. Clinopyroxene (CPX I) has high Al2O3 content in the core (up to 16 wt.%) and is partially converted to spherical symplectitic aggregates consisting of lower-Al2O3 clinopyroxene (CPX II) (
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high pressure aluminous mafic rocks from the ronda peridotite massif southern spain significance of sapphirine and corundum Bearing Mineral assemblages
Lithos, 2001Co-Authors: Shoji Arai, Tomoaki Morishita, Fernando GervillaAbstract:We firstly present detailed microtextural relationships in sapphirine- and corundum-Bearing aluminous mafic rocks alternating with peridotites from the Ronda massif, southern Spain. Garnet and clinopyroxene are the main phases in the aluminous mafic rocks. Garnet is partially to completely kelyphitized. Clinopyroxene (CPX I) has high Al2O3 content in the core (up to 16 wt.%) and is partially converted to spherical symplectitic aggregates consisting of lower-Al2O3 clinopyroxene (CPX II) (<5 wt.%) and plagioclase. Corundum is associated with spinel and plagioclase. Sapphirine occurs in two different Mineralogical associations, i.e., as elongated lamellae within CPX I and as very fine-grained crystals in plagioclase-rich domain. The sapphirine+plagioclase aggregate suggests the former presence of kyanite as one of reactants. Sapphirine is partially converted to symplectitic aggregate of spinel and plagioclase. The earliest metamorphic Mineral assemblage recorded in the aluminous mafic rock was garnet+clinopyroxene±kyanite±corundum, i.e., eclogitic Mineral assemblages, at P≥1.5 GPa and T≥900°C. Many reaction textures were developed during decompression possibly coupled with cooling. The latest P–T conditions recorded in the aluminous mafic rock were at P=1 GPa and T=800–900°C. This decompression had possibly followed the compression of plagioclase-rich, low-pressure cumulate or residue.