The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists最新文献

{"title":"Ultramafic and mafic inclusions in Nodegamiyama basalts from the eastern part of Fukushima Prefecture, Northeast Japan","authors":"Teiko Ichinose, K. Shuto, R. Yashima","doi":"10.2465/GANKO1941.81.384","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.384","url":null,"abstract":"Ultramafic and mafic inclusions, including intermediate ones, up to 3 cm in size found in high magnesian tholeiitic basalts are divided into the following three groups based on the mineral assembalge and texture: 1) poikilitic peridotite and pyroxenite, 2) pyroxenite including webster-ite, clinopyroxenite and orthopyroxenite, and 3) gabbro and diorite. The 1st group consists of euhedral olivine chadacrysts with chrome spinel inclusions, and clinopyroxene and/or orthopyrox-ene oikocrysts. The 2nd one shows equigranular in texture, but the last one does poikilitic and equigranular. Most of them contain interstitial patches composed of plagioclase, magnetite, clinopyroxene and glass. Petrographic features suggest that these inclusions are cumulates derived from the host magma.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"62 1","pages":"384-391"},"PeriodicalIF":0.0,"publicationDate":"1986-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80995631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"D/H study on clay minerals from the Iwami Kuroko deposit, Shimane Prefecture, Japan","authors":"Y. Kuroda, Yoshiharu Kida, Koji Watanabe, Takeshi Oba, S. Matsuo","doi":"10.2465/GANKO1941.81.302","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.302","url":null,"abstract":"","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"4 1","pages":"302-311"},"PeriodicalIF":0.0,"publicationDate":"1986-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85605631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-magnesian Nodegamiyama basalts from the eastern part of Fukushima Prefecture, Northeast Japan","authors":"K. Shuto, Teiko Ichinose, Toshiaki Takimoto, R. Yashima","doi":"10.2465/GANKO1941.81.312","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.312","url":null,"abstract":"High-magnesian tholeiitic basalts of early Miocene age are distributed on Nodegamiyama which is located in the eastern part of Fukushima Prefecture, Northeast Japan. These basalts (Nodegamiyama basalts) occur as a dome, with a diameter of about 300 meters, which intrude into Cretaceous granitic rocks occupying in Abukuma mountainland. Nodegamiyama basalts are sparsely phyric (phenocrysts of olivine with chrome-spinel inclusions, clinopyroxene, orthopyroxene and plagioclase 10 vol%>). These basalts are characterized by relatively high SiO2 (52.0-52.7 wt%), high MgO (8.0-9.3 wt%), relatively low CaO (8.7-9.1 wt%), high Ni (167-220ppm) and high Cr (540-690ppm). The clinopyroxene phenocrysts contain considerable amounts of Al2O3 (3.8-8.0 wt%), and the calculated Ca-Tschermak's component ranges from 7.5 to 13.6 mol per cent, which suggest that these clinopyroxene phenocrysts are thought to have crystallized from the basalt magma at a depth of about 30km in the lower crust in this region. Differences in bulk chemical compositions between Nodegamiyama basalts and Ryozen basalts may be ascribed to differences in the degree of partial melting between these two primary magmas and also in water content in the source mantle peridotites of these two primary magmas.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"9 1","pages":"312-323"},"PeriodicalIF":0.0,"publicationDate":"1986-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88543692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relation between electronegativity and heat of formation in MX4, halide","authors":"H. Ohashi","doi":"10.2465/GANKO1941.81.333","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.333","url":null,"abstract":"The heats of formation of halides (HfX4 ZrX4, TiX4SiX4CX4), -ΔH°298, are empirically expressed in terms of electronegativities (xC and xA) of cation and anion (halogen ion): -ΔH°298/(4e2/rC)=axA+b/xC-c+dxA+e, where a, b, c, d, and e are empirical constants; factor 4, e, and rC represent the valence number of cation, the charge on the electron, and cation-radius, respectively. The value of 4e2/rC corresponds to electrostatic energy between effective nuclear charge of the M4+ ion (4e) and an electron at a distance from its nucleus equal to its ionic radius rC. Although physical meaning is not clear, this empirical equation is useful in predicting electronegativity and/or ionic radius from the heat of formation, and vice versa. The electronegativity of Hf4+ is revised to be 1.4 in Pauling's scale and the ionic radius of Th4+ in tetrahedral site is estimated to be 0.77A. The heats of formation of GeX4, SnX4 and PbX4 (X: halogen) are related to both cation radius (rC) and anion radius (rA): -ΔH°298{(-e2/rA)/(-100kcalthmol-1)}1/2/(4e2/rC)=axA+b.From this empirical equation the heat of formation of SnF4, (g) is estimated to be 235 kcalthmol-1.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"51 92 1","pages":"333-339"},"PeriodicalIF":0.0,"publicationDate":"1986-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80372817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fission track ages of some Cenozoic acidic intrusive rocks from Ryukyu Islands","authors":"M. Daishi, M. Hayashi, Y. Kato","doi":"10.2465/GANKO1941.81.324","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.324","url":null,"abstract":"The fission track ages of zircon have been measured in nine acidic intrusive rocks from the Ryukyu Islands by the arranged fix-area population method and the external-surface external-detecter grain-by-grain method. The ages are as follows: Kuchinoerabujima xenolith (granodiorite), 15.0±1.2Ma; Okinoerabujima granodiorite, 32.9±2.7 Ma; Okinawajima tonalite, 30.0±4.7Ma; Okinawajima quartzporphyry, 15.7±1.3Ma, 15.3±1.5Ma, and 15.8±1.7Ma; Ishigakijima Omoto granite, 28.7±0.9Ma, 29.9±0.9Ma and 29.9±1.1Ma. These fission track ages indicate that the acidic intrusive rocks were emplaced in late Oligocene and early to middle Miocene times.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"84 1","pages":"324-332"},"PeriodicalIF":0.0,"publicationDate":"1986-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90252149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrography and chemistry of Hime-shima volcanic rocks in Oita, southwest Japan","authors":"Toshimitsu Iwaya, H. Kurasawa","doi":"10.2465/GANKO1941.81.291","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.291","url":null,"abstract":"Hime-shima volcanic rocks in the the Hime-shima Island, southwest Japan are composed of five bodies: Daruma-yama lava (garnet-bearing biotite-hornblende dacite), Shiro-yama lava (garnet-bearing rhyolite), Yahazu-dake lava (biotite-bearing hornblende dacite-rhyolite), Morose lava (biotite-bearing hornblende dacite) and Hashiraga-dake lava (garnet-bearing biotite-hornblende rhyolite). These rocks can be divided into two types: garnet-bearing and garnet-free types. The lavas of garnet-bearing type are subdivided into hornblende-bearing and hornblende-free subtypes. The lavas of garnet-free type are distributed in cenrtal parts of the Hime-shima Island, while those of garnet-bearing type are in the eastern and western ends of the Hime-shima Island. Hime-shima volcanic rocks range in composition from dacite (morose lava; SiO2=68.81%) to rhyolite (Shiro-yama lava; SiO2=74.88%). The lavas of garnet bearing type tend to be more felsic than those of garnet free type. The Hime-shima volcanic rocks may represent a later stage of magmatic differentiation, but it seems difficult to decide whether these volcanic rocks are derived from an original basaltic magma or they are remelting products of deeper part of the crust.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"81 1","pages":"291-301"},"PeriodicalIF":0.0,"publicationDate":"1986-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79529173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability of diopside-jadeite solid solution","authors":"S. Banno","doi":"10.2465/GANKO1941.81.281","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.281","url":null,"abstract":"Paragenetic relations of natural jadeite-diopside solid solution is well explained by a phase diagram proposed by Carpenter (1980). However, his interpretation of free energy-composition relation to give rise the phase diagram is hardly accepted because it requires positive excess energy of mixing in solution with ordered phase. An alternative model giving the same phase diagram is presented. It assumes strong interaction between next neighbours with resultant stabilization of quartet of cations, which is analogous to the stabilization of NaCaMgAl quartet of omphacite. The model favors rather simple ideal solution to approximate the results of synthetic experiments over complex non-ideal model of Holland (1983). An isopleth of univariant composition in P-T is proposed.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"23 1","pages":"281-288"},"PeriodicalIF":0.0,"publicationDate":"1986-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74417807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineral chemistry of late Mesozoic to Paleogene granitic rocks in the Inner side of southwestern Japan","authors":"Y. Tainosho","doi":"10.2465/GANKO1941.81.241","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.241","url":null,"abstract":"Granitic rocks of the late Mesozoic to the early Tertiary period in southwestern Japan occur in three E-W trending belts; from south to north, the Ryoke, the San'yo, and the San'in zones. Granitic rocks in each of these zones are further divided into three stages based on variation in emplacement age: namely, older, middle and younger stages. A comparison of the different zones based on electron microprobe analysis of the main constituent minerals from more than 130 localities is as follows. Ryoke zone: The K-feldspar in this zone are the most potassic, ranging from Or 80 to Or 90. Plagioclase rims range from approximately An 25 to An 40. Biotites have mg-values (Mg/Mg+Fe) ranging from 0.1 to 0.5; Si is approximately 5.5 (based on O=22). The biotites are rich in Fe2+ and AlIV. Hornblendes are ferro-hornblende to ferro-tschermakitic varieties, with AlIV approximately 1.5; mg-values range from 0.15-0.5. Fe/Mg ratios are similar to ortho- and clinopyroxenes in the different zones (hypersthene and augite, respectively). San'yo zone: The K-feldspars are more sodic than the above, ranging approximately from Or 70 to Or 85, with the younger suite being the most sodic. K-feldspars become more potassic with increasing SiO2 contents. Plagioclase is normally zoned, with rims clustering the range An 5-25. Biotites are Fe rich (mg-value 0.1-0.5), with variable AlIV. Most of the hornblendes belong to ferro-hornblende or actinolitic hornblende. Hornblende's chemistry is between that of the Ryoke and the San'in zones. San'in zone: The K-feldspar in this zone are most sodic, ranging approximately from Or 60 to Or 80, the most sodic compositions belong to the younger granites. An-content of plagioclase rims is low. Biotites are poor in AlIV, with mg-values clustering in the range approximately 0.6-0.3. Hornblende is poor in Fe and AlIV and is magnesio-hornblende. The Fe/Mg ratio of constituent biotite and hornblende varies among the three zones. This reflects the fact that oxygen partial pressure is highest in the San'in zone and lowest in the San'yo and Ryoke zones. The San'in granites are thought to have been emplaced in the shallow crust, whereas the Ryoke granites are thought to have been emplaced at a deeper level and to have cooled more slowly. In the San'yo granites, the depth of granite emplacemont is between the above two. The depth of emplacement and the oxygen partial pressure vary within each zone. In the San'in zone, the oxygen partial pressure is higher and the depth of granite emplacement is shallower if the granitic activity is at a late stage. Older stage granites were produced under reduction conditions rather than oxydation conditions. In the San'yo zone, middle stage granites were formed at lower oxygen partial pressures than younger stage granites. Some of the younger stage granites were formed under oxydation conditions. In the Ryoke zone, the older stage granites were emplaced at a deeper level and were cooled more slowly than the younger st","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"5 2","pages":"241-259"},"PeriodicalIF":0.0,"publicationDate":"1986-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72577437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrothermal syntheses of graphite from bituminous coal at 0.5-5 kbar water vapor pressure and 300-600°C","authors":"M. Tagiri, T. Oba","doi":"10.2465/GANKO1941.81.260","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.260","url":null,"abstract":"Hydrothermal experiments were carried out to synthesize graphite from bituminous coal at water vapor pressure of 0.5-5 kbar using 1% Li2CO3 or 2% Ni metal as a catalyst. Oxygen fugacities were controlled by hematite+magnetite (HM), nickel+nickel oxide (NNO) or quartz+ fayalite +magnetite (QFM) buffers during six runs at 1 kbar. Graphite crystallized from bituminous coal at about 375°C, 0.5 kbar; 405°C, 1 kbar; 390°C, 2 kbar and 320°C, 5 kbar under uncontrolled fo2 conditions. The transition boudary from bituminous coal to graphite has a positive inclination below 1 kbar and a negative inclination over 1 kbar under uncontrolled fo2 conditions. The negative inclination of the transition boundary was probably due to the experiments that the oxygen fugacity was incompletely buffered by the escape of hydrogen gas from the system through the Ag-Pd capsule-wall. Under the foe controlled conditions by NNO buffers, graphite crystallized between 400°C and 420°C at 1 kbar. When fo2 were controlled by NNO or QFM, the crystallinity of graphite increased abruptly to reach a fully-ordered state at 420°C. The experimental results were compared with graphitization of carbonaceous material in black schists from some metamorphic districts, and also with oxygen isotope geothermometry. In natural systems, graphitization depends on metamorphic temperature and oxygen fugacity, but not on metamorphic pressure to a great extent.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"39 1","pages":"260-271"},"PeriodicalIF":0.0,"publicationDate":"1986-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72761389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Notes on petrography and rock-forming mineralogy (17)","authors":"H. Onuki, Yuji Takanashi","doi":"10.2465/GANKO1941.81.272","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.272","url":null,"abstract":"The chemical variation of pumpellyite on a thin section scale has been determined in two prehnite-pumpellyite facies metabasites. These rock specimens are characterized by the presence of abundant hornblende relics and the high distribution-density of veinlets. Pumpellyites occurring in and around prehnite-rich veinlets have been examined for one specimen and those in the same mineral assemblage replacing original plagioclase crystals for the other specimen. Microprobe analyses give evidence of wide compositional variations (ΣFe2O3=3.4-17.9 wt. % in the former and 6.5-12.6 wt. % in the latter). Pumpellyite crystals even in the same pseudomorph after plagioclase have fairly varying compositions (ΣFe2O3=9.7-12.6 wt. %). The chemically sympathetic variations of coexisting pumellyite, epidote and prehnite can be explained in terms of the presence of several local domains with different effective bulk chemical compositions which were essentially controlled by the degree of the interaction between preexisting phases and circulating veinlet-forming fluids during metamorphism. These individual domains appear to be roughly in chemical equilibrium because of the consistent Al-Fe distribution between coexisting pumpellyite, epidote and prehnite.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"23 1","pages":"272-280"},"PeriodicalIF":0.0,"publicationDate":"1986-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77367146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}