著者
佐藤 源郎
出版者
資源地質学会
雑誌
鉱山地質 (ISSN:00265209)
巻号頁・発行日
vol.7, no.25, pp.225-230, 1957-09-30 (Released:2009-06-12)
参考文献数
14
著者
石原 舜三
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.62, no.1, pp.106-108, 2012 (Released:2013-08-01)
参考文献数
7
著者
八幡 正弘 黒沢 邦彦 大津 直 高橋 徹哉 戸間替 修一 川森 博史 毛利 元躬
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.44, no.1, pp.1-16, 1994-02-28
参考文献数
21
被引用文献数
3

Terrestrial volcanic products and lacustrine deposits of Middle Miocene to Pliocene age are widely distributed in the Monbetsu-Kamishihoro Graben which belongs to the Kuril Inner Arc. The Seta deposit located in the southern extremity of the Graben is classified into a hot spring gold deposit, based upon the modes of occurence.<BR>In the Seta mine area, Middle Pliocene lacustrine deposits of the Ashoro Formation which were accumulated in the Tokachi Basin unconformably covers Late Miocene to Early Pliocene terrestrial volcanic products of the Horokapiribetsugawa Formation. The lacustrine deposits are composed of sandstone, mudstone and siliceous deposits associated with a hot spring gold mineralization. A wide variety of sedimentary structure of the lacustrine deposits is observable in this area ; for detailed investigation, a logging of 80 meters of new diamond drill core (GSH-91-1) was necessary, which revealed the sedimentary structure of the basal part of the deposits and the relationship of the Horokapiribetsugawa and the Ashoro Formations. Siliceous deposits have been divided into 5 types, S-I to S-V. Silica is deposited as silica sinter (S-I) on land and/or temporally on shore near the water line, and also conducted into the cold lake water by the thermal water as a thin bedded siliceous deposit (S-II), because the silica gelation quickly proceeds under the influence of current or wave. The hydrothermal eruption broke up the underlying rocks for breccias like a clastic dike and, as a result, scattered breccias, so-called hydrothermat explosion breccias (S-IV) and/or the accidental silica blocks (S-III) in tuff and sandstone. When the hydrothermal eruption took place intermittently in shallow water, silica was deposited as silica complex deposit with sandstone and conglomerate (S-V)<BR>The hydrothermal activity has been divided into seven stages (I to VII). In the Stage I, just prior to form the lake, the acid hydrothermal activity, began, resulting in the silicified and argillized zones in the Horokapiribetsugawa Formation. Stage II, is characterized by the prevalence of hydrothermal explosion breccias on the land of the northern edge of the lake. As mixing of the ascending acid thermal water with the cold groundwater or interstitial water in the basal part of the lacustrine deposits and the argillized rocks of the Horokapiribetsugawa Formation just under the surface of unconformity, adularia formed in sandstone and argillized tuff breccia with kaolin minerals as an alteration product. In the Stages III and V, the hydrothermal activity increased and silica was deposited on the land and/or on the bottom of the lake resulted in silica sinter, thin, bedded siliceous deposit and siliceous complex deposit. Stages IV and VI-1 are similar to Stage II. It may be inferred that the hydrothermal activity was carried on the shore of the lake or the land. In the Stage IV-2, the silica sinter which deposited to a thickness of about 2 meters on land. The hydrothermal activity has silicified to the surrounding rocks and has formed vertical and horizontal quartz veins in these rocks. In the Stage Vll, the hydrothermal activity was attenuated.<BR>These spots of the hydrothermal activity moved from north to south associated with the gold mineralization.
著者
渡辺 寧
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.66, no.1, pp.27-34, 2016 (Released:2018-08-15)
参考文献数
27

A future perspective of the supply of mineral resources is discussed on the basis of the example of rare earth elements (REE). Rare earth elements have been produced from monazite, bastnäsite, and ionic clay ores mostly in China during the last two decades. However, Chinese resource nationalism over the production and export has made the supply of REE unstable in terms of price and quantity. A possible alternative REE source is phosphate ores, which contain a few amount of REE as impurities with some toxic and radioactive elements. Despite low in REE concentration in phosphate ores, more than 300,000 tons of REE (as oxides), which correspond to more than two times of present-day REE demand in the world, are included in the ores annually produced from the mines for fertilizer production. The recovery of REE with other impurities from phosphate ores is beneficial not only to produce REE but also to avoid pollution in farming lands. While our society shifts from the plundering one to the sustainable one, in which mineral resources would be completely recycled, it is desired to recover all the by-product elements from the major ores in order to decrease the impacts on the environment and trigger innovations in the manufacturing industry.
著者
島崎 英彦
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.59, no.1, pp.73-76, 2009 (Released:2010-06-22)
参考文献数
12
著者
渡辺 寧
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.60, no.2, pp.103-122, 2010 (Released:2013-06-14)
参考文献数
63
著者
亀井 玄人
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.51, no.2, pp.145-151, 2001-12-15 (Released:2009-06-12)
参考文献数
26
被引用文献数
2

The groundwater of the Mobara gasfield in Boso peninsula, eastern Japan, contains considerable amount, around 100 mg/L, of iodine besides dissolved methane. Twelve groundwater samples from gas-producing wells to the aquifer within the Kazusa Group in Mobara and Naruto districts have been analyzed for iodine, pH, Eh, HCO3-, NH4+, SiO2(aq), δD, δ18O, δ13CCH4 and seventeen elements. There is a good correlation between the concentrations of the dissolved elements to those in marine algae. The principal source of the iodine is believed to be algae buried in the sediments and the iodine has been discharged to the porewater during decomposition of the tissue.The molar ratio of I-/Cl- in the groundwater increases from 1.0×103 to 2.2×103 with changing the depth from 2000 to 1000 meters below the surface and turns to decrease from 2.2×103 to 1.8×103 with going up from 1000 to 500 meters. This tendency may be caused by the variation of buried organisms due to changing the sedimentary environment. The observed variation in the ratio indicates that the iodine discharged in the pore fluid did not migrate significantly after the deposition of the formation.
著者
正路 徹也
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.61, no.3, pp.217-248, 2011-12-08
参考文献数
11

The 2011 earthquake off the Pacific coast of Tohoku and the following tsunami caused loss of a large number of lives, destruction of not only many private houses but also infrastructures, and the Fukushima I nuclear accidents, although disasters for the mineral and exploration world in Japan were not so serious. It is other sensational topics that gold prices have increased rapidly, and are higher than 1800 US$/oz in August, 2011, and that copper prices recorded the highest of 8966 $/t (LME) on November 11, 2010. Japanese mining, petroleum and trading companies and JOGMEC (Japan Oil, Gas and Metals National Corporation) continue their activities steadily, and get many fruitful results in exploration and development of mineral and energy resources, which have been carried out in these several years and decades. For example, Sumitomo Metal Mining Co., Ltd and Sumitomo Corporation have confirmed the presence of a gold, silver, and antimony mineralization zone in the Stone Boy project, Araska. Idemitsu Kosan Co., Ltd and JX Nippon Oil & Gas Exploration Corp. have been awarded independently and jointly many new exploration licences located in British and Norwegian North Sea, and conduct the exploration programs in some blocks as the operatores.
著者
スミルノフ V.I. ボロダエフ Iu.S. スタロスチン V.I.
出版者
資源地質学会
雑誌
鉱山地質 (ISSN:00265209)
巻号頁・発行日
vol.18, no.91, pp.284-291, 1968

日本の硫化鉄鉱鉱床<SUP>*1</SUP>の多くは,アルプス地向斜発展期初期段階のものである中新世のスピライトーケラトフフイア岩系の岩石帯に集中している.この種の鉱床の鉱体は,火山砕屑岩層に覆蔽された流紋岩質層の近辺に賦存し,累帯構造を示している.下位の熱水性変質作用を受けている流紋岩中には,交代成微脈―鉱染状硫化物鉱石(珪鉱)が発達している.その上位には塊状の硫化鉄鉱鉱石(黄鉱)が分布している.そしてさらに,海成の成層火山砕屑岩に整合的に覆蔽された高品位多金属鉱(黒鉱―чёрная руда,black ore)が,その上位に分布している.この鉱床は,火山源堆積作用の複合生成物と思われる.すなわち,鉱体下位のものは流紋岩に対する熱水溶液の作用によつて生成し,上位のものは中新世の海底にその熱水溶液が運んできた物質が沈殿して生成したものと思われる.<BR>1940年代になつて,A.ザヴァリツキーはウラルの硫化鉄鉱鉱床について新しい火山源生成説を提起したが,彼は,第三紀火山作用と結びつけた日本の「黒鉱」に関する日本の地質学者たちの考え方(木下亀城,1931)をその中にとり入れ支持していた.しかし硫化鉄鉱鉱床の生成条件に関する考え方が変つてきた現在,日本の硫化鉄鉱鉱床の地質に関するデータは,その火山源熱水―堆積性起源説(Theory of volcanogenic hydrothermal-sedimentary origin)の検討に基本的な支えとなり得るものである.そのために,日本のデータがソ連の地質学者の大きな関心を呼んでいるわけである.<BR>本論文を執筆するに当つて筆老らは次のように分担した.すなわち,1966年秋に日本の代表的な「黒鉱」鉱床を訪れて,研究試料を得てきたV.I.スミルノフは,地質の記載とその他のすべてのデータの全般的な総括(スミルノフ,1967)を行ない,Iu.S.ボロダエフは鉱石試料の顕微鏡的研究結果についてまとめ,V.I.スタロスチンはその試料の物理的性質の研究を行ない,そのデータを提供した.<BR>本論文の執筆は,東京大学の渡辺武男教授と立見辰雄教授,東北大学の竹内常彦教授,その他のきわめて熟達した著名な日本の鉱山地質学者との会合で,大いに刺激された結果である.また,同和鉱業株式会社社長新井友蔵博士とその補佐役の方々から,日本の硫化鉄鉱鉱床の巡検に積極的な協力と援助を受けた.これらすべての方々,および本論文を校閲して下さつたT.N.シャドルンとG.F.ヤユヴレフの両氏に厚く感謝申し上げる.<BR>著者はまた,日本の鉱石試料から得た硫化鉱物中の硫黄同位元素の分析を早く終了するために,V.I.ヴィノグラードフの高配を得た.<BR>当該鉱床の地質を説明する図葉は,日本の鉱山地質学者の資料から借用したが,遺憾ながら原図に明記してないため,その人々の名を示すことができなかつた.
著者
石原 舜三
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.62, no.1, pp.106-108, 2012-03-05
参考文献数
7
著者
吉江 隆 大坪 徹 奥 直樹 上田 祐子
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.65, no.2, pp.53-79, 2015

Pan Pacific Copper Co.,Ltd. (PPC) commenced intensive explorations for the Caserones copper-molybdenum deposit and its cluster deposits in 2006 just after the acquisition of property and confirmed more than one billion tons of resources in 2009. <br>Vertical mineral zonation related to weathering is distinctive in the Caserones deposit, which the oxidized and sulfide supergene enrichment zones are determined over the primary mineralization. <br>Primary Cu-Mo sulfide mineralization follows both spatially and temporally the intrusion of dacite porphyry (PDA), a NNW-SSE elongated dyke intruding into the Paleozoic monzogranite batholith and the breccia probably in close genetic relationship with PDA. Three stages of the mineralization are recognized. Early stage accompanies potassic alteration. Veins equivalent to EB and A in El Salvador occur in this stage. Quartz-sericite alteration is the most prominent alteration and dominated in the third stage which is also the most intensive period of veining of the so-called D-vein. The porphyry mineralization is overlapped by an epithermal-like mineralization (ZEP) which carries pyrite, chalcopyrite, galena and tennantite. Fluid inclusion study recognizes two types of inclusions, type Ⅰ(V+L+S) and type III(V+L, V<30%). Type Ⅰ inclusions show homogenization temperature ranging 283-463&deg;C and salinity between 31.8-44.4% NaCl eq. On the other hand, type III inclusions have temperature ranging 329-474&deg;C and salinity ranging 4.6-20.6% NaCl eq. Fluid inclusions of ZEP are characteristically low both in temperature and salinity, 200-288&deg;C and 2.9-7.4% NaCl eq respectively. Chronological study indicates 17-19 Ma for dacite porphyry, sericite and molybdenite.<br>Several prospects are known in the project area and they show common characteristics in geology with the Caserones deposit, while interpreted period of those magmatism and mineralization is possibly older than of the Caserones. Exploration for those deposits are still in reconnaissance stage, but some 100-200 million tons of sulfide potential is estimated for Cerro Sur prospect and some 40 million tons of oxide potential is expected for Angelica prospect.
著者
石原 舜三 ゴネフチュク V. G. ゴネフチュク G. A. コロステレフ P. G. サイダイン G. R. セメンジャク B. I. ラトキン V. V.
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.47, no.5, pp.255-261, 1997-10-31
参考文献数
8
被引用文献数
2

表記地域には古生代,中生代初期と後期の花崗岩.類が重複して産出し,特にグライゼン型錫およびゼノサーマル型多金属鉱化で特徴ずけられる多数の鉱床を伴う.しかし,それら鉱化作用がどの花崗岩に関連するかは,必ずしも明確ではなかった.今回,7錫鉱床と3金鉱床からの22試料について主に変質および鉱脈鉱物のK-Ar年代を求め,次の鉱化年代を得た.Sn:Khinganskoe 91.8 Ma,Merekskoe 85.9Ma,Solnechnoe 86.2Ma,Pravourmiskoe 91.8Ma,Vostochnoe 90.3Ma,Chalba 84.4Ma,Tigrinoe 79.4Ma;Au:Krinichoe 79.4Ma(鉱化前岩脈),76.2Ma(鉱化後岩脈),Askold 83.2 Ma,Maiskoe 57.1Ma.以上の様に白亜紀中期以前の古い花崗岩類に相当する年代は得られず、錫鉱化作用は白亜紀後期の花崗岩活動に伴うものであり,その年代と鉱床の性格は日本の山陽帯のそれぞれと類似する.一方,金鉱床も白亜紀後期,一部で古第三紀の年代を示し,中国地方東部一近畿地方西部の同種鉱床の年代に近い.
著者
佐藤 比奈子 石山 大三 水田 敏夫 松葉谷 治 村上 史一
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.60, no.1, pp.15-24, 2010 (Released:2013-06-14)
参考文献数
13
被引用文献数
3

Tamagawa hot spring is a volcanic gas-bearing hydrothermal system derived from Quaternary andesitic to dacitic magma beneath Yakeyama volcano. Thermal waters and precipitates of Tamagawa Hot Spring in 2002 and 2007 were investigated to clarify the geothermal structure of the area. Thermal waters in Tamagawa Hot Spring area are divided into three types: Cl-SO4type (Ohbuki Hot Spring: pH 1.2), SO4type (pH 1.8 to 2.9) and neutral-type (pH 6.1). Concentrations such as F, Cl, SO4, Na, K, Mg and Ca in Cl-SO4type Ohbuki thermal water are ten to several hundred-times higher than those of elements in SO4type thermal waters. The concentrations of elements in SO4 type thermal waters also varied according to changes in geothermal structures supplying steam and the flow system of groundwater and vapor in Tamagawa geothermal system from 2002 to 2007.The oxygen and hydrogen isotopic ratios of the thermal waters in the system suggest that SO4 type thermal waters are formed by heating of shallow groundwater by the steam separated from Ohbuki thermal water below Tamagawa Hot Spring area. On the other hand, the small variation of chemistry and hydrogen and oxygen isotopic ratios of Cl-SO4 type Ohbuki thermal water from 2002 to 2007 suggests that the Cl-SO4 type Ohbuki thermal water originates from a deeper part of Yakeyama Volcano. The flow rate of Cl-SO4 type Ohbuki thermal water below Tamagawa hot spring area was estimated to be 13,000 l/min.
著者
宮久 三千年
出版者
資源地質学会
雑誌
鉱山地質 (ISSN:00265209)
巻号頁・発行日
vol.12, no.56, pp.317-323, 1962
被引用文献数
1

The contact metasomatic and the vein-type ore deposits of the Shin-Kiura tin mine have been worked since old times for tin, silver, arsenic and copper. These are characterized by complex mineralization at a wide range of temperature related to the Tertiary granitic intrusion. Recently, lollingite-cassiterite-quartz-wollastonite vein-like deposits, containing native gold, native bismuth and tellurobismuthite, have been found in the Uriya-Kaneko adit of this mine.<BR>In this paper, mineragraphy of the Au-Te-Bi-As ore is presented, and genesis of the similar mineralizations in Japan is discussed.