The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists最新文献_第6页

Aragonite from the Nikoro greenstones in the Tokoro Belt, eastern Hokkaido, Japan 日本北海道东部东野带东野绿岩中的文石

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-11-05 DOI: 10.2465/GANKO1941.81.446

M. Sakakibara

引用次数: 0

Application of thermoluminescence dating to geothermal history of the Tamagawa-Kowase area, Hachimantai geothermal field, northeast Japan 热释光测年在日本东北八幡台地热田多川-小濑地区地热史中的应用

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-11-05 DOI: 10.2465/GANKO1941.81.458

I. Takashima, S. Honda

{"title":"Application of thermoluminescence dating to geothermal history of the Tamagawa-Kowase area, Hachimantai geothermal field, northeast Japan","authors":"I. Takashima, S. Honda","doi":"10.2465/GANKO1941.81.458","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.458","url":null,"abstract":"Alteration ages have been determined for 26 samples by the thermoluminescence dating of phenocrystic quartz separated from altered rhyo-dacitic rocks. The samples were collected mainly from the widely distributed green colored alteration halos. Obtained ages range from 0.057 to 1.80Ma with the accuracy of ±30%. The thermal manifestation areas correspond to the places with the alteration ages of younger than 0.5Ma. It is statistically considered that the hydrothermal activity periodically occurred four times in separate places during 1.78Ma to present with the ending times of 1.7, 1.2, 0.7 and 0.5Ma B. P., respectively. The duration of each hydrothermal activity is preliminary estimated as about 0.3 to 0.4Ma. A linear relation is observed for the alteration ages and subsurface temperature of 1500m depth. The temperatures of 1500m depth of the areas of 0.9Ma and 0.5Ma are 95°C and 145°C, respectively. However, the temperature of the area close to active volcano (Yakeyama) shift to higher than expected value from above relation. It may be attributed to the effect of the heat supply from Yakeyama volcano at present time.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"56 1","pages":"458-465"},"PeriodicalIF":0.0,"publicationDate":"1986-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85636670","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

Report on the 14th IMA General Meeting 第14届IMA大会报告

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-10-05 DOI: 10.2465/GANKO1941.81.427

I. Sunagawa

引用次数: 0

Teallite from the Toyoha mine, Hokkaido 北海道丰河矿的蓝石

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-10-05 DOI: 10.2465/GANKO1941.81.393

A. Sugaki, Ken-ichiro Hayashi

{"title":"Teallite from the Toyoha mine, Hokkaido","authors":"A. Sugaki, Ken-ichiro Hayashi","doi":"10.2465/GANKO1941.81.393","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.393","url":null,"abstract":"Teallite was firstly found in Japan from a new vein (Sorachi uwaban-hi) of the Toyoha mine, Hokkaido. It occurs in association with galena and sometimes sphalerite in central drusy portion of zinc and lead veinlet, 0.5 to 1.0cm in width, which cuts principal pyrite ore containing sphalerite, arsenopyrite, quartz and small amounts of cassiterite and stannite in the vein. Teallite appears as aggregate of curved thin-platy or flaky crystals, 0.5 to 5.0mm in length and 1 to 20μm in thickness, and shows metallic ruster of silver white in color. Under ore microscope, it has distinct pleochroism from yellowish white to pale brownish white, and strong anisotropism from brownish gray to bluish brown. It changes to black immediately by HNO3 (1:1), and reacts slightly with FeCl3 (20%) to stain pale brown. No etching reaction with HCl(1:1), HgCl2 (sat.), KCN (20%) and KOH (sat.) was observed. The reflectances measured at 406, 436, 497, 546, 586 and 648nm in wave length are: 34.3-50.0, 31.5-50.7, 32.1-50.2, 34.7-49.7, 35.2-48.6, 34.5-49.5%, respectively. Vickers hardness (10g load) on {010} is 10.8-19.3kg/mm2. Its cell dimension is orthorhombic, a=4.258 (1), b=11.447 (3), c=4.103 (1)A. Chemical compositions of teallite obtained by EPMA are Pb1.07-1.10Cu0.02-0.04Fe0.01-0.02Zn0.02-0.08Sn0.84-0.87S1.95-2.02 on the basis of 4 atoms per molecule. They are plotted in PbS side of PbSnS2 in the PbS-SnS join, although all the compositions of teallite reported by authors up to now are in the SnS side of the join.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"10 1","pages":"393-398"},"PeriodicalIF":0.0,"publicationDate":"1986-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87635178","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: 4

Cenozoic minette from Kawamoto district, Shimane Prefecture, Southwest Japan 日本西南部岛根县川本地区的新生代矿物

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-10-05 DOI: 10.2465/GANKO1941.81.423

T. Nagao, Y. Matsumoto, T. Matsuda, S. Iizumi, Motoaki Oda

引用次数: 3

Photon-activation analysis of standard rocks using an automatic γ-ray counting system with a micro-robot 用微型机器人自动γ射线计数系统对标准岩石进行光子活化分析

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-10-05 DOI: 10.2465/GANKO1941.81.406

Takeyoshi Yoshida, K. Masumoto, K. Aoki

{"title":"Photon-activation analysis of standard rocks using an automatic γ-ray counting system with a micro-robot","authors":"Takeyoshi Yoshida, K. Masumoto, K. Aoki","doi":"10.2465/GANKO1941.81.406","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.406","url":null,"abstract":"Nondestructive multi-element photon-activation analysis has been used to determine the abundance of thirteen trace elements: Ba, Ce, Co, Cr, Cs, Nb, Ni, Rb, Sc, Sr, Y, Zn and Zr in nine GSJ standard rocks (JR-1, JR-2, JG-1, JA-1, JB-1, JB-2, JB-3, JGb-1 and JP-1) and four USGS standard rocks (G-2, GSP-1, AGV-1 and BCR-1). Rock samples and multi-element standards were irradiated simultaneously with 30 MeV bremsstrahlung. The (γ, n) and (γ, p) reaction products were measured with an automatic γ-ray counting system with a micro-robot. In a typical measurement, the counting statistics error is lower than 5% for concentrations>2ppm for Nb, 5ppm for Ce, 10ppm for Co, Rb, Sr, and Y, and for Zr at concentrations>20ppm. The abundance of elements in the rock standards obtained with the present facility are in good agreement with the reported data in most cases. Precision is better than ±5% (lσ) for concentrations>10ppm for Nb and Y, >50ppm for Sr, and for Co, Rb, and Zr at concentra-tions>25 to 40ppm, depending on the element. It is important for volcanic geochemistry in island arcs to determine Nb, Y, and Zr together with Rb and Sr accurately.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"65 1","pages":"406-422"},"PeriodicalIF":0.0,"publicationDate":"1986-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75795010","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: 17

Chemical composition of Cr-bearing garnets in Japan 日本含铬石榴石的化学成分

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-10-05 DOI: 10.2465/GANKO1941.81.399

Teruko Kobayashi

引用次数: 1

Geology and petrography of the Tanohata zoned pluton in northern Kitakami Mountains 北上山北部塔诺霍分带岩体地质与岩石学研究

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-09-05 DOI: 10.2465/GANKO1941.81.359

Toshihiko Hayashi

{"title":"Geology and petrography of the Tanohata zoned pluton in northern Kitakami Mountains","authors":"Toshihiko Hayashi","doi":"10.2465/GANKO1941.81.359","DOIUrl":"https://doi.org/10.2465/GANKO1941.81.359","url":null,"abstract":"Geological and petrographical studies were carried out on the rocks from Early Cretaceous granitoids (112-122Ma) in the Tanohata area, northeastern Japan. It was revealed that the granitic complex called the Tanohata pluton consists of six granitic intrusives, which are different in lithology and intruded at the different stages. The largest body is a concentric texturally and compositionally zoned pluton. This body is definede as the Tanohata aoned pluton. Other five smaller bodies are distrbuted aroud the zoned pluton. The granitoids that make up the Tanohata zoned pluton are progressively more felsic inward; from biotite hornblede quartz diorite_??_tonalite (A-2 type) at the margin to biotite leucogranodiorite (A-7 type) in the center through biotite hornblende tonalite_??_granodiorite (A-3, 4 type), hornblende biotite granodiorite (A-5 type) and biotite granodiorite (A-6 type). The mineral assemblages of these rock types are as follows: pl+opx+cpx+ho+bio+qz+K-f (A-2 type), pl+cpx+ho+bio+qz+K-f (A-3 type), pl+ho+bio+qz+K-f (A-4, 5 type), pl±ho+bio+qz+K-f (A-6 type), and pl+bio+qz+K-f (A-7 type, pl+opx+cpx+ho+bio) is foud with the A-2 and A-3 types. The zoned pluton is generally fine-grained and well-foliated at the margin and becomes progressively coarse-grained and poorly-foliated towards center. Mafic minerals decrease and quartz and K-feldspar slightly increase from the margin to the center (from 27-21 to 7-4 in the color index). The anorthite content of plagioclase core decrease from 60-52 at the margin to 35-28 in the center. Continuous geological and petrographical changes of these rocks (at least the A-2_??_A-7 types) suggest that this zoned pluton formed by differentiation of a single magma, and that the crystallization sequences of principal minerals is plagioclase, orthopyroxene, clinopyroxene, hornblende, biotite, quartz, and K-feldspar.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":"11 1","pages":"359-369"},"PeriodicalIF":0.0,"publicationDate":"1986-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87626733","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: 3

Growth and post growth histories of high quartz as revealed by natural and laboratorical etching 高石英的生长和生长后的历史揭示了自然和实验室蚀刻

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-09-05 DOI: 10.2465/GANKO1941.81.348

I. Sunagawa, Ayako Sugibuchi

引用次数: 3

Tephroite and knebelite from Hijikuzu Mine, Iwate Prefecture, Japan 日本岩手县Hijikuzu矿的铁辉石和铁辉石

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1986-09-05 DOI: 10.2465/GANKO1941.81.341

W. Keankeo, T. Kitamura, Katsijtoshi Tanida

引用次数: 1