The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists最新文献_第8页

Mode of occurrences and chemical compositions of dolomite and kutnahorite related to manganese mineralization at the Jokoku mine, southwestern Hokkaido, Japan 日本北海道西南部Jokoku矿与锰矿化有关的白云岩和库纳辉岩赋存模式及化学成分

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-06-05 DOI: 10.2465/GANKO1941.81.205

D. Ishiyama, H. Matsueda

{"title":"Mode of occurrences and chemical compositions of dolomite and kutnahorite related to manganese mineralization at the Jokoku mine, southwestern Hokkaido, Japan","authors":"D. Ishiyama, H. Matsueda","doi":"10.2465/GANKO1941.81.205","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.205","url":null,"abstract":"Epithermal vein-type manganese deposits of the Jokoku mine occur in Pre-Tertiary sedimentary and Tertiary acidic pyroclastic rocks of southwestern Hokkaido, Japan. Dolomite, which commonly occurs in the deposits, can be divided into two types; (1) fine-grained anhedral metasomatic dolomite in the Pre-Neogene limestone and (2) fine-grained dolomite of veins resulting from Neogene hydrothermal activity. Magnesium-bearing kutnahorite occurs in both the metasomatic dolomite and the dolomite veins. Kutnahorite in the metasomatic dolomite is occurred as a reaction rim between dolomite and rhodochrosite. Kutnahorite in the dolomite veins is euhedral and coexists with ferromanganoan dolomite. Formation temperature of the minerals associated with kutnahorite in metasomatic dolomite is estimated to be about 200°C based on the filling temperature of fluid inclusions etc. Based upon the chemical compositions and mode of occurrences of kutnahorite in metasomatic dolomite at the Jokoku mine, it is suggested that the hydrothermal solutions having low (mMg2+/mMn2+)aq would replace dolomite.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"23 1","pages":"205-217"},"PeriodicalIF":0.0,"publicationDate":"1986-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86504100","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}

引用次数: 2

Hydrothermal porosity reduction of sandstone 热液降低砂岩孔隙度

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-06-05 DOI: 10.2465/GANKO1941.81.218

K. Kano

引用次数: 0

Rock types of Miocene two petrographic provinces in the Pacific side region of Northeast Japan 日本东北太平洋地区中新世两个岩相省的岩石类型

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-05-05 DOI: 10.2465/GANKO1941.81.190

K. Shuto, R. Yashima

引用次数: 1

Magmatic differentiation in the volcanic rocks from Ulreung Island, Korea 郁陵岛火山岩岩浆分异特征

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-05-05 DOI: 10.2465/GANKO1941.81.165

Yoon Kyu Kim

引用次数: 14

Increase of chromium with fractionation in early formed pyroxene: examples from boninite and Kasayama andesite 早期形成辉石中铬的分馏增加:以博宁岩和Kasayama安山岩为例

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-05-05 DOI: 10.2465/GANKO1941.81.181

K. Shiraki, Masatoshi Hanta, Y. Matsumoto

引用次数: 3

Oyelite from Suisho-dani, Ise, Mie Prefecture 产自三重县伊势市瑞穗大尼的黄叶石

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-04-05 DOI: 10.2465/GANKO1941.81.138

T. Minakawa, S. Inaba, Shigetoshi Noto

引用次数: 2

REE abundances of the effusive and intrusive rocks from the Shimokawa mining area, Hokkaido, Japan 日本北海道下川矿区溢流岩和侵入岩的稀土元素丰度

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-04-05 DOI: 10.2465/GANKO1941.81.129

S. Koshimizu, O. Sawai, T. Bamba

{"title":"REE abundances of the effusive and intrusive rocks from the Shimokawa mining area, Hokkaido, Japan","authors":"S. Koshimizu, O. Sawai, T. Bamba","doi":"10.2465/GANKO1941.81.129","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.129","url":null,"abstract":"The Shimokawa mining area is an example of collision orogenesis formed by accretion of Shimokawa diabase complex and Nisama igneous complex. The former, which consists of pillow lava, diabase sheet and diabase dike, is believed to be formed with turbidite strata in a fore-arc basin of Cretaceous age. Whereas, the latter is a gabbroic intrusion mainly consisting of olivine gabbro, norite and diorite. Major chemical element compositions and REE abundances of main rock types of above two complexes are discussed. It is inferred that Shimokawa diabases are of tholeiitic rock series. The differentiation index (D. I.) shows that pillow lava can not be distinguished from the diabase sheet whereas diabase dike has significantly high value. REE abundances of above three rock types decrease with the increase of D. I. value, especially towards lighter element. Three rock types of the Nisama igneous complex are wholly of calc-alkaline rock series. Both REE abundances and D. I. values increase in the order norite-olivine gabbro-diorite. Chondrite-normalized REE patterns and (La)EF/(Sm)EF in terms of ∑ FeO/MgO led to the conclusion that the Shimokawa diabases belong to solid type and the Nisama igneous rocks to liquid type, respectively. The Shimokawa diabase complex, which has been believed to belong to MORB by many investigators, might be formed in an island arc environment.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"2 1","pages":"129-137"},"PeriodicalIF":0.0,"publicationDate":"1986-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85921584","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}

引用次数: 0

Weathering process of Nabari gabbroic body 2 纳巴里辉长岩风化过程2

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-03-05 DOI: 10.2465/GANKO1941.81.116

S. Okumura

{"title":"Weathering process of Nabari gabbroic body 2","authors":"S. Okumura","doi":"10.2465/GANKO1941.81.116","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.116","url":null,"abstract":"Weathering process of plagioclase in the middle depth of weathering crust which develops at the top of Nabari gabbroic body, Southwest Japan was examined mineralogically and geochemically. Unweathered core stones are coated, first by shell and then by saprolite in the upper depth (Zone A) and in the middle depth (Zone B), whereas they are directly coated by saprolite in the lower depth (Zone C). In the Zone B, the shell shows a sequence of different types of weathering products of plagioclase, which occur in layering from outer part to inner fresh part within the shell as follows:-compact kaolinite (Type 1); -sparse halloysite (Type 2); -void space with minor amount of gel (Type 3); -unweathered plagioclase. As for the formation of void space (Type 3), it is inferred that plagioclase dissolves congruently by chemical weathering at the middle depth of the weathering crust. As plagioclase dissolves, released constituent cations, including aluminum, are almost removed out from the shell, and no secondary minerals neoform in the immediate vicinity of dissolving plagioclase. The congruent dissolution indicates that the dissolution process is controlled kinetically by mineral-water interfacial reaction in non-equilibirium and that the released constituents are all removed out by transport of pore solution and/or by ion diffusion in aqueous media in open system. The lack of secondary minerals shows the need to introduce kinetics of non-equilibrium process also in precipitation.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"1 1","pages":"116-128"},"PeriodicalIF":0.0,"publicationDate":"1986-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83117149","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}

引用次数: 2

Miocene volcanic rocks from the eastern part of the Shimokita Peninsula, Northeast Japan 日本东北部下基塔半岛东部的中新世火山岩

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-03-05 DOI: 10.2465/GANKO1941.81.93

Toshiaki Takimoto

引用次数: 7

0Major-element, Rb, Sr, Y and Zr composition and origin of volcanic rocks from the Kikai Caldera, south of Kyushu 九州南部Kikai火山口火山岩主元素、Rb、Sr、Y、Zr组成及成因

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-03-05 DOI: 10.2465/GANKO1941.81.105

O. Ujike, T. Soya, K. Ono

{"title":"0Major-element, Rb, Sr, Y and Zr composition and origin of volcanic rocks from the Kikai Caldera, south of Kyushu","authors":"O. Ujike, T. Soya, K. Ono","doi":"10.2465/GANKO1941.81.105","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.105","url":null,"abstract":"X-ray fluorescence analysis was carried out for major elements on 13 volcanic rocks and for Rb, Sr, Y and Zr on 24 volcanic rocks from the Kikai Caldera. The 30 available major-element analyses indicate that the rocks constructing the land portions of Kikai Caldera are tholeiitic and calc-alkalic and their SiO2 contents show two separate ranges, 50-60% and 69-73%. No clear correlation is observed between the stage of caldera evolution to which the samples belong and the chemical composition of the samples. Most of all the samples seem to have been more or less affected by mixing of magmas with mafic and felsic compositions. All the analyses are in limited ranges of ratios between highly incompatible elements ; K/Rb=270-340 and Zr/Rb=2.2-2.9. This implies that all the Kikai magmas were ultimately derived from a single source. The rhyolites are likely to be derivatives by partial melting of materials formed from a batch (or batches) of basalt magma emplaced within the crust ahead of others. The Rb/Y-Zr/Y systematics strongly suggests that the basalt source region was enriched in Rb by mantle metasomatism.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"358 1","pages":"105-115"},"PeriodicalIF":0.0,"publicationDate":"1986-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76511596","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}

引用次数: 9