Journal of Mineralogical and Petrological Sciences最新文献_第4页

Protolith age and metamorphic temperature of the Yokokawagawa metamorphic rocks in Nagano Prefecture, central Japan, and comparison with the Sanbagawa metamorphic rocks 日本中部长野县横川变质岩的原岩年龄、变质温度及其与三川变质岩的比较

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.221215

H. Mori, T. Tokiwa, Hiroki Mizumura, Kohei Yoshikawa, Y. Nobe, Y. Kouketsu

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Counter-clockwise P-T history deduced from kyanite-bearing pelitic gneiss in Tenmondai Rock, Lützow-Holm Complex, East Antarctica 东南极洲l<s:1>佐-霍尔姆杂岩Tenmondai岩含蓝晶石泥质片麻岩的逆时针P-T历史

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.221202

S. Baba, Prayath Nantasin, A. Kamei, Ippei Kitano, Y. Motoyoshi, N. Setiawan, Davaa-ochir Dashbaatar, T. Hokada

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Boron isotope compositions of coexisting kornerupine and tourmaline in high-grade metabasic rocks: an example from Akarui Point, Lützow-Holm Complex, East Antarctica 高品位变质基性岩中共存的kornerupine和电气石的硼同位素组成:以南极洲东部l<s:1> zow- holm杂岩Akarui Point为例

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.230131b

Tetsuo Kawakami, S. Harley

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Crystal structures of anhydrous borax α-Na2B4O7 and γ-Na2B4O7 and ab initio quantum chemical calculations of structural stability on their fundamental building blocks 无水硼砂α-Na2B4O7和γ-Na2B4O7的晶体结构及其基本构件结构稳定性的从头算量子化学计算

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.230112

Wataru Nishiyasu, A. Kyono

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Asagiite, NiCu4(SO4)2(OH)6·6H2O, a new member of the ktenasite group from the Nakauri mine, Shinshiro City, Aichi Prefecture, Japan Asagiite, NiCu4(SO4)< 2(OH)6·6H2O，来自日本爱知县新四市Nakauri矿山的ktenasite组新成员

4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.230711

Daisuke NISHIO-HAMANE, Takeshi YAJIMA, Norimasa SHIMOBAYASHI, Masayuki OHNISHI, Takefumi NIWA

{"title":"Asagiite, NiCu4(SO4)2(OH)6·6H2O, a new member of the ktenasite group from the Nakauri mine, Shinshiro City, Aichi Prefecture, Japan","authors":"Daisuke NISHIO-HAMANE, Takeshi YAJIMA, Norimasa SHIMOBAYASHI, Masayuki OHNISHI, Takefumi NIWA","doi":"10.2465/jmps.230711","DOIUrl":"https://doi.org/10.2465/jmps.230711","url":null,"abstract":"Asagiite, a newly-discovered mineral having the ideal formula NiCu4(SO4)2(OH)6·6H2O, is a member of the ktenasite group, representing a Ni analogue. It occurs as a secondary mineral on smithsonite aggregates that overlie fractures in a serpentinite found in the Nakauri mine within Aichi Prefecture, Japan. Asagiite exhibits a unique pale blue-green coloration and so is named after the traditional Japanese color “asagi-iro.” Asagiite occurs as thin plate-like crystals with perfect cleavage along {001} planes. The crystal size of this mineral is typically 0.1 to 0.2 mm, although in rare cases crystals may range up to 0.5 mm in length. These crystals are vitreous, transparent and non-fluorescent and have also been shown to be brittle with a Mohs hardness of 2½. The measured and calculated densities of asagiite are 2.90(3) and 2.92 g·cm-3, respectively. This mineral is optically biaxial (-) with α = 1.577(2), β = 1.620(2) and γ = 1.631(2) together with a 2Vcalc value of 52.4°. Electron microprobe analyses determined an empirical formula (based on 2S) of (Cu3.44Ni0.76Zn0.59Co0.18Fe0.01)Σ4.98S2O7.95(OH)6.05·6H2O. Based on single crystal X-ray diffraction data, the structure is monoclinic with space group P21/c and unit cell parameters a = 5.6095(8), b = 6.1259(7), c = 23.758(3) Å, β = 95.288(4)°, V = 812.92(17) Å3 and Z = 2. Single-crystal structural determination also gives an R1 value of 0.0303. The seven most intense peaks in the powder X-ray diffraction pattern [d in Å (I/I0) hkl] were found to be 11.830 (100) 002, 5.912 (64) 004, 4.845 (55) 013, 3.920 (45) 006, 2.953 (33) 008, 2.668 (57) 202 and 2.571 (36) 123, with unit cell parameters of a = 5.614(5), b = 6.108(8), c = 23.758(18) Å, β = 95.62(7)° and V = 810.8(14) Å3.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135158308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tectonic division of the Southwestern terrane at the western Sør Rondane Mountains, Dronning Maud Land, East Antarctica, from a viewpoint of zircon U–Pb ages 从锆石U-Pb年龄的角度看东南极洲Dronning Maud地西部Rondane山西南地体的构造划分

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.221203

K. Tsukada, Purevdulam Sukhbaatar, M. Owada, T. Shimura, M. Yuhara, A. Kamei, Yusuke Shimura, Onon Gantumur

引用次数: 0

Compositional dependence of intensity tensor and electric field gradient tensor for Fe2+ at M2 sites of enstatites by single crystal Mössbauer spectroscopy Fe2+强度张量与电场梯度张量的组成依赖性 & > & > / & >

4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.221015

Keiji SHINODA, Keita ONOUE, Yasuhiro KOBAYASHI

{"title":"Compositional dependence of intensity tensor and electric field gradient tensor for Fe2+ at M2 sites of enstatites by single crystal Mössbauer spectroscopy","authors":"Keiji SHINODA, Keita ONOUE, Yasuhiro KOBAYASHI","doi":"10.2465/jmps.221015","DOIUrl":"https://doi.org/10.2465/jmps.221015","url":null,"abstract":"The intensity tensor for Fe2+ doublets at the M2 sites and electric field gradient tensor for Fe2+ at the M2 sites in two enstatites (En) with the orthorhombic system were determined by single crystal Mössbauer spectroscopy to examine the ferrosilite (Fs) component dependence of the intensity tensor of enstatite. The components of the intensity tensor for Fe2+ doublets at the M2 sites in the En65.5Fs31.7Wo2.7-enstatite and En90.7Fs8.7Wo0.6-enstatite are IXX = 0.577(6), IYY = 0.454(6), and IZZ = 0.470(12), and 0.616(2), 0.458(4), and 0.426(6), respectively. Thus, those three components have a weak dependence on the contents of Fs component. The components, IXY, IYZ, and IXZ, of the intensity tensor due to Mössbauer nuclei that occupy general positions in the space group Pbca pyroxene structure are derived as IXY = IYZ = IXZ = 0 by the symmetric summation of equivalent Mössbauer nuclei in the structural site. Three components, IXX, IYY, and IZZ, were determined by applying constraint of IXY = IYZ = IXZ = 0. The intensity tensors by Mössbauer nuclei at general positions obtained without any constraints (IXY ≠ IYZ ≠ IXZ ≠ 0) are consistent with those derived by applying the symmetrical constraint (IXY = IYZ = IXZ = 0). This indicates that the intensity tensor due to Mössbauer nuclei that occupy general positions can be simplified by the symmetrical constraint.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135843510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Grain size reduction of albite porphyroblasts in pelitic schists of the Sanbagawa metamorphic belt, Kanto Mountains, Japan 日本关东山三巴川变质带泥质片岩中钠长石玢岩母细胞的粒度减小

4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.221219c

Mutsuko INUI, Shuto KOJIMA, Yoshiya NAGATSUMA

引用次数: 0

The Kuunga Accretionary Complex of Sverdrupfjella and Gjelsvikfjella, western Dronning Maud Land, Antarctica. 南极Dronning Maud地西部的Sverdrupfjella和Gjelsvikfjella的Kuunga增生复合体。

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2023-01-01 DOI: 10.2465/jmps.230125

G. Grantham, M. Satish-Kumar, K. Horie, Henriette UECKERMANN H

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Tracht change of groundmass pyroxene crystals in decompression experiments 减压实验中地质体辉石晶体的通道变化

IF 0.7 4区地球科学

Journal of Mineralogical and Petrological Sciences Pub Date : 2022-01-01 DOI: 10.2465/jmps.211219

Shota Okumura, S. Okumura, A. Miyake

{"title":"Tracht change of groundmass pyroxene crystals in decompression experiments","authors":"Shota Okumura, S. Okumura, A. Miyake","doi":"10.2465/jmps.211219","DOIUrl":"https://doi.org/10.2465/jmps.211219","url":null,"abstract":"Groundmass pyroxene crystals in pumice from the 1914 eruption of Sakurajima in Japan show varied combinations of crystallographic faces (i.e., ‘ tracht ’ ). To investigate whether the groundmass pyroxene tracht depends on magma decompression conditions, we performed isothermal single – step decompression experiments on hydrous Sakurajima dacite magma. The magma was held under water – saturated conditions at 920 °C, 120 MPa, and oxygen fugacity conditions no more oxidizing than one log unit above Ni – NiO equilibrium for 24 h. Then, a control experiment was immediately quenched, whereas others were decompressed to ﬁ nal pressures of 20, 10, or 5 MPa and held for 3 h before quenching. Groundmass pyroxenes in the control experiment and that quenched at 20 MPa showed octagonal shapes, whereas those decompressed to lower pressures characteristically had hexagonal shapes. Some pyroxenes in the 20 MPa experiment were hexagonal near plagioclase crystals because plagioclase crystallization locally increased the supersaturation of pyroxene in the melt. We conclude that the tracht of groundmass pyroxenes changes from octagonal to hexagonal as the degree of e ﬀ ective undercooling increases and thus re ﬂ ects the decompression history of a magma during its ascent in a volcanic conduit.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0