Journal of Mineralogical and Petrological Sciences最新文献

{"title":"Crystal structure of nesquehonite, MgCO3·3H(D)2O by neutron diffraction and effect of pH on structural formulas of nesquehonite","authors":"Gen–ichiro Yamamoto, A. Kyono, J. Abe, A. Sano‐Furukawa, T. Hattori","doi":"10.2465/JMPS.200117","DOIUrl":"https://doi.org/10.2465/JMPS.200117","url":null,"abstract":"Neutron di ff raction, Raman spectroscopy, and thermal analysis were performed to investigate the composition, structure, and formation conditions of the magnesium carbonate hydrate nesquehonite. The crystal structure of deuterated nesquehonite was analyzed by Rietveld re fi nement of the time – of – fl ight neutron powder di ff raction pattern. The crystal structure possessed the monoclinic space group P 2 1 / n with lattice parameters of a = 7.72100(12) Å, b = 5.37518(7) Å, c = 12.1430(3) Å, β = 90.165(4)°, and V = 503.956(13) Å 3 . The re fi nement with a fi nal crystal structure model of deuterated nesquehonite converged to wRp = 4.22% and Rp = 3.50%. The result of structure re fi nement showed that two deuterium atoms are coordinated to the O1, O2, and O6 atoms as a water molecule in the nesquehonite. The fact that the three water molecules were included in the structure suggests the structural formula of the nesquehonite obtained in the study should be written as MgCO 3 ·3H 2 O not Mg(HCO 3 )(OH)·2H 2 O.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44926212","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}

{"title":"Zircon U–Pb ages and whole–rock geochemistry from the Hida granites: implications for the geotectonic history and the origin of Mesozoic granites in the Hida belt, Japan","authors":"Raiki Yamada, H. Sawada, Shinnosuke Aoyama, Wataru Ouchi, S. Niki, M. Nagata, Toshiro Takahashi, T. Hirata","doi":"10.2465/JMPS.201125","DOIUrl":"https://doi.org/10.2465/JMPS.201125","url":null,"abstract":"The Hida granites, classi fi ed into the pre – Jurassic and Jurassic plutons in this study, are important components of the Hida belt, which is a Paleozoic – Mesozoic basement of the Japan arc and underwent Permian to Triassic metamorphism during the collision between the North and South China blocks. This study performed zircon U – Pb dating and whole – rock geochemical analyses for the Hida granites from the major plutonic bodies to reveal the geotectonic history and the origin of the Hida belt. Obtained 238 U – 206 Pb weighted mean ages exhibit 239.1 – 238.3 Ma for the Katakaigawa body (augen granite) and 200.5 – 180.9 Ma for the other bodies (non – deformed granitoids), and these ages can be correlated to the pre – Jurassic and Jurassic plutons, respectively. Geochronological results suggest that the mylonitization forming augen granites of the pre – Jurassic plutons occurred during its intrusion and indicate that the Jurassic plutons are distributed widely in the Japan Sea side of the Hida belt. Meanwhile, geochemical characteristics of whole – rock major and trace element compositions indicate that the pre – Jurassic and Jurassic plutons seem di ffi cult to distinguished geochemically and suggest that both of them are adakitic and non – adakitic granites generated in subduction zone.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44554947","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}

{"title":"Ore and skarn mineralogy of the Eboshi deposit of the Naganobori copper mine, Yamaguchi, Japan","authors":"M. Nagashima, Y. Morishita, Yuji Imoto, T. Imaoka","doi":"10.2465/JMPS.200818","DOIUrl":"https://doi.org/10.2465/JMPS.200818","url":null,"abstract":"Mineral assemblages and chemical compositions of ore minerals from the Eboshi deposit, the historical Naganobori copper mine, Yamaguchi Prefecture, Japan were investigated in order to clarify its characteristics as a skarn deposit. Some Bi – , Ag – , and Te – bearing minerals are newly identi fi ed, which contribute updating the mineralization sequence of this deposit. Samples collected from the mine dump are one massive magnetite ore, and copper ores associated with skarn gangue minerals. Skarns are categorized as clinopyroxene skarn, garnet skarn, and wollastonite skarn, and the clinopyroxene skarn is the most dominant. The major ore minerals are chalcopyrite, cobaltite, and early – stage pyrite (Py – I) and later stage pyrite (Py – II). Py – II is enriched in arsenic (~ 5.19 As wt%). The Bi – , Ag – , and Te – bearing minerals, such as native bismuth, bismuthinite, wittichenite, emplectite, tsumoite, kawazulite, hessite, and matildite are minor ore minerals. Based on the mineral assemblages and textures of the specimens examined, four ore mineralization stages were recognized; the ore mineralization stage I is characterized by the major ore minerals such as chalcopyrite, bornite, pyrrhotite, sphalerite, and Py – I. The stage II is de fi ned by the mineralization of cobaltite, Py – II, and Bi( – Cu) – bearing sul fi des such as native bismuth, bismuthinite, and wittichenite. The mineralization stage III is characterized by the Ag – and/or Te – bearing ore minerals such as matildite, kawazulite, tsumoite, and hessite. The stage IV is characterized by chalcopyrite veins cutting the main skarn masses and the host limestone. The mineralogical properties and mineralization process of the Eboshi deposit is similar to those of the skarn deposits in the Yamato mine and the Tsumo mine, and consistent with common skarn – type deposits associated with ilmenite – series granitoids in the San – yo Belt, which are characterized by the occurrence of minor Ag – and/or Te – bearing ore minerals.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49415954","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}

{"title":"Chemical and lithium isotope characteristics of murakamiite and Li–rich pectolite from Iwagi Islet, Southwest Japan","authors":"T. Imaoka, J. Kimura, Q. Chang, T. Ishikawa, M. Nagashima, N. Takeshita","doi":"10.2465/JMPS.200721","DOIUrl":"https://doi.org/10.2465/JMPS.200721","url":null,"abstract":"We report in situ major and trace element and Li isotope analyses of murakamiite and Li – rich pectolite in an albitite and whole – rock analyses of the albitite and host granite from Iwagi Islet, SW Japan. The albitite forms small bodies that are several tens of centimeters to tens of meters in size, disseminated in a host granite of Late Cretaceous age. The studied murakamiite – bearing albitite contains albite, sugilite, aegirine – augite, quartz, murakamiite – Li – rich pectolite, microcline, katayamalite, and accessory minerals. It shows conspicuous strain – induced textures. The murakamiite and Li – rich pectolite form a solid solution with Li × 100/(Li + Na) atomic ratios ranging from 44.2 to 60.1, and the Na line pro fi les show a zoning structure in which Na decreases from core to rim. Major and trace element compositions of murakamiite – pectolite normalized to that of albitite in-dicate the enrichments of some elements, particularly in Mn, Ca, Li, Sr, and REEs, roughly on the same order of magnitude (~ 10 times). The albitite – normalized element concentrations vary systematically with ionic radius of the element; the normalized concentrations of cations with the same valence roughly form a simple convex parabolic curve when plot against the ionic radius. This indicates that the element partitioning of murakamiite and pectolite during metasomatism to form albitite took place under a strong control of crystal structure, quasi – equilibrated with metasomatic fl uids and coexisting minerals. The δ 7 Li values of murakamiite and Li – rich pectolite show a wide range from − 9.1 to +0.4 ‰ (average − 2.9 ‰ ), and no obvious correlation with Li contents was observed. These δ 7 Li values should have resulted from hydrothermal fl uid – rock interactions at the temperatures of 300 – 600 °C. The very low δ 7 Li values down to − 9.1 ‰ may have originated from intra – crystalline Li isotope di ff usion, or involvement of deep – seated, Li – Na – enriched subduction – zone fl uids with low δ 7 Li values. ,","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49620054","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}

{"title":"Discovery of datolite in a high–pressure marble from the Sanbagawa metamorphic belt: Indication of B–rich fluid activity","authors":"Kenta Yoshida, S. Niki, H. Sawada, R. Oyanagi","doi":"10.2465/jmps.200730","DOIUrl":"https://doi.org/10.2465/jmps.200730","url":null,"abstract":"Datolite [CaBSiO 4 (OH)] was discovered in an eclogite – facies calcite marble collected from the Eastern Iratsu body in the Sanbagawa metamorphic belt of central Shikoku. The marble was composed of calcite, diopside, and garnet that contained inclusions of omphacite. Enclosed in the marble is a pod composed mainly of quartz, with subordinate calcite, diopside, and garnet that has inclusions of datolite. The formation conditions of the datolite were estimated on the basis of mineral assemblage and the Raman elastic geobarometer to be approximately 400 – 650 °C and 0.8 – 1.3 GPa, which coincide with the conditions of the eclogite juxtaposition with the non – eclogite units in the Besshi district. Our study records the highest pressure – temperature conditions as the metamorphic datolite formation. Our fi ndings provide evidence for the occurrence of B – rich fl uid in fi ltration during the juxtaposition of eclogite unit with the non – eclogite unit in the Besshi district.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830618","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}

{"title":"Modulated structure of hemimorphite associated with pressure–induced phase transition","authors":"K. Okamoto, T. Kuribayashi, T. Nagase","doi":"10.2465/jmps.210731","DOIUrl":"https://doi.org/10.2465/jmps.210731","url":null,"abstract":"In situ high – pressure single – crystal X – ray di ff raction experiments on natural hemimorphite, ideally Zn 4 [Si 2 O 7 ](OH) 2 ·H 2 O, up to 4.7 GPa were conducted to investigate its pressure response property associated with pressure – induced phase transition. After the phase transition con fi rmed between 2.46 and 3.01 GPa, pairs of satellite re fl ections were newly found at certain Bragg re fl ections. The modulation vector q of the satellites was approximately [0, 1/8.4, 0]. The results of the re fi nements on the averaged structure indicated that the modulation arose from displacements of atomic sites associated with the mechanism of the phase transition, i.e., the rotation of the secondary building unit (SBU). The lower rotation angle of the SBU ( Φ ) than the value estimated from the non – modulated structure meant that the high – pressure phase contained anti – phase boundaries (APBs) resulting from the opposite direction of the SBU rotation and that the coherency was held across the APBs. Within the coherent domain, the APB ’ s intervals were distributed along the b – axis with a mean value of 8.4 b ≈ 90 Å, where the displacement of each site η ( y ) was approximated as the fi rst – harmonic. The distribution of the direction of SBU rotation was initially considered to be inhomogeneous, but the elimination of the APBs had proceeded anisotropically and had been aborted below 3.01 GPa.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68831599","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}

{"title":"Zircon U–Pb ages of the pegmatites in the Kontum massif, central Vietnam and their quality evaluation for ceramic industry","authors":"Truong Chi Cuong, P. T. Hieu, Pham Quang Nhat Minh, Kenta Kawaguchi, Nong T. Q. Anh, K. Hung","doi":"10.2465/jmps.210911","DOIUrl":"https://doi.org/10.2465/jmps.210911","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832292","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}

{"title":"Evolution of supracrustal rocks of the Indochina Block: Evidence from new detrital zircon U–Pb ages of the Kontum Massif, Central Vietnam","authors":"Kenta Kawaguchi, P. Minh, P. T. Hieu, Truong Chi Cuong, K. Das","doi":"10.2465/JMPS.200916","DOIUrl":"https://doi.org/10.2465/JMPS.200916","url":null,"abstract":"*Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju 54896, Republic of Korea **Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Higashi–Hiroshima 739–8526, Japan ***Faculty of Geology, University of Science, Ho Chi Minh City, Vietnam Vietnam National University, Ho Chi Minh City, Vietnam ‡Hiroshima Institute of Plate Convergence Region Research, Higashi–Hiroshima 739–8526, Japan","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830669","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}

{"title":"Structure changes of nanocrystalline mackinawite under hydrothermal conditions: formation of greigite and its structural properties","authors":"Y. Sano, A. Kyono","doi":"10.2465/jmps.210418","DOIUrl":"https://doi.org/10.2465/jmps.210418","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"121 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68831420","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}

{"title":"Structure Refinement of Prehnite from Passaic County, New Jersey, USA","authors":"K. Sugiyama, T. Kawamata, T. Kuribayashi","doi":"10.2465/jmps.210318","DOIUrl":"https://doi.org/10.2465/jmps.210318","url":null,"abstract":"The crystal structure of prehnite Ca2(Al, Fe)(Si3AlO10)(OH)2 from Upper New Street Quarry, Paterson, Passaic County, New Jersey, USA was determined by single–crystal X–ray diffraction. The converged structural model in the space group P2cm [a = 4.63309(9) Å, b = 5.4839(1) Å, c = 18.5100(3) Å, Z = 2] allowed for the investigation of an ordered Si/Al distribution together with the feasible hydrogen positions inferred from the difference Fourier maps.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68831222","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}