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.61, no.2, pp.121-127, 2011 (Released:2013-07-27)

参考文献数

26

被引用文献数

1

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Trace amounts of arsenic in igneous rocks are low in a deep-origin magma and high in crust-origin, ilmenite-series magmas. Magmas crystallized in high levels, shallow granitoids and volcanic rocks, are also high in the arsenic contents. In sedimentary rocks, arsenic contents are high in black shale. In ore deposits, arsenic is concentrated in some volcanogenic veins (e.g., Ashio), and Sn-W veins and skarns in the ilmenite-series granitic terranes (e.g., Sanyo Belt, SW Outer Zone). Among volcanogenic massive sulfides, arsenic is enriched in some Kuroko type but generally low in the Besshi type. Arsenic is most concentrated in Miocene vein type of the Ashio deposits, then Cretaceous vein type of Kanagatou and Koizumi deposits, located at the northern margin of the Sanyo Belt. Arsenic occurs as arsenopyrite and also as Cu-sulfosalts of mostly copper deposits, and therefore concentrated in copper concentrates. Arsenic is volatile metal, and therefore extracted from ash in the chimney of copper smelter.

著者

丸茂 克美 江橋 俊臣 氏家 亨

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.53, no.2, pp.125-146, 2003-12-04 (Released:2009-06-12)

参考文献数

20

被引用文献数

8

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Soil Contamination Countermeasures Law (referred to hereafter as the Law) was made on 29 May 2002, for preventing health damage which toxic substances as Pb, As, Cr(VI) and Cd in soils could cause by oral ingestion.In order to carry out the Law, we must judge whether soils have high toxic metal concentrations or high leachabilities caused by anthropogenic or natural processes. If high toxic metal concentrations or high leachabilities are caused by natural processes, the administration of the Law should not oblige landowners, managers and occupiers of contaminated sites to remedy them.Therefore, it is essential to determine natural levels of Pb, As, Cr(VI) and Cd concentrations and their leachabilities of Japanese soils which have a wide range of chemical and mineralogical composiotion. It is also very important to develop chemical and mineralogical analytical methods to judge whether soils have high toxic metal concentrations or high leachabilities caused by anthropogenic or natural processes.We obtained Pb, As, Cr(VI) and Cd concentrations and leachabilities of stream and marine sediments, as well as soils formed by weathering of volcanic ashes and granite and granitoid, using XRF and conventional wet chemical analytical methods. We also obtained mineralogical data of these sediments and soils, using XRD, TG-DTA and analytical TEM. Furthermore, we obtained lead isotope ratios of these sediments and soils, using ICP-Mass.

著者

麻木 孝郎 末岡 慎也 深澤 秀明 伊東 靖彦 古野 正憲 長 久

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.54, no.1, pp.27-36, 2004-05-20 (Released:2009-06-12)

参考文献数

5

被引用文献数

1

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Since 2001, Nittetsu Mining has been carrying out copper exploration activities in twenty-two promising areas in Northern Chile, which were extracted using ASTER image analysis. In these areas, Furano area in Region I has been selected as the most important target considering its high mineral potential inferred from the ASTER image analysis and its easy access.Furano area, covering 282km2, locates some 15km northwest of Cerro Colorado copper mine. Geology of the basement rocks mainly consists of lower Cretaceous andesite and Paleogene intrusive rocks. They are widely covered by ignimbrite and alluvium sediment of Tertiary to Quaternary age. The RC drilling program of 13 holes, totaling 3, 704m, was carried out on the prospective locations in the western part of the project area, which were selected by geological and geochemical surveys. Dominant copper and gold mineralizations were observed in some holes. Above all, a tourmaline breccia zone in silicified andesite showed average copper grade of 0.9% over the depth from 110m to 190m in one hole. The ore body shows 40m in width, dipping 55 degrees towards north, and is expected to be 400m continuation from the distribution of surface mineral occurrences. About 20 million tons of ore reserve was estimated above the depth of 300m. In another hole, drilled in ignimbrite-covered area, oxidized and corroded tourmaline breccia and underlying chalcopyrite-disseminated granite porphyry were observed. A secondary precipitation of chalcocite was also recognized in the lower part of the tourmaline breccia. These evidences suggest that the adjoining area covered by ignimbrite still has high potential for porphyry copper deposition. Additional drilling exploration is required around those holes.

著者

宮下 敦

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.45, no.253, pp.313-321, 1995-10-31 (Released:2009-06-12)

参考文献数

36

---

Based on a compilation of geological and geophysical data, a new hypothesis is proposed for the formation of epithermal Au-Ag deposits in the Hokusatsu region, Kyushu, Japan. Several Plio-Pleistocene stratovolcanos in a graben with anortheasterly trend would have the following feature of gravity data:a regional low anomaly (-10mgal) corresponds to the graben being filled with low density sediments, and areal high anomalies (+30mgal) in the reagional low gravity correspond to the center of andesitic stratovolcanoes.In the Hokusatsu region, all stratovolcanic bodies are accompanied with one or more epithermal Au-Ag ore deposits. Veins of these deposits have a northeast orientation approximately perpendicular to the regional tensional stress orientation related to the opening of the Okinawa Trough.

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

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

荻原 成騎

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.42, no.234, pp.249-257, 1992-08-30 (Released:2009-06-12)

参考文献数

23

---

Phosphorite nodules were newly found in laminated lacustrine diatomaceous sediments of the Middle Pleistocene Nogami Member in Kusu Formation northern Kyusyu (Japan) which deposited in palaeo-Kusu lake. The phosphorous content of these nodules is about 25% in P2O5. These nodules resemble marine phosphorite nodules in composition, consisting primarily of carbonate-fluorapatite.Phosphorite nodules were formed from phosphate originally contained in diatom during early diagenesis. These nodules show compositional zoning and color banding due to dissolution by meteoric or hydrothermal water. The fixation of phosphorous is likely to have been controlled by concentration of Ca.

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

沢井 長雄 景山 宗一郎 岡田 利典 板谷 徹丸

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.51, no.1, pp.19-27, 2001-05-25 (Released:2009-06-12)

参考文献数

27

被引用文献数

1

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A large number of epithermal vein-type gold deposits are distributed in the northern-central Kyushu. K-Ar ages were determined for sericite and K-feldspar separated from hydrothermally-altered rocks and quartz-K-feldspar veins, and for quartz-alunite altered rock, which were collected from gold deposits located outside the Beppu-Shimabara Graben, to examine their age of gold mineralization. The results are 2.61±0.06 and 2.74±0.13 Ma in Ogata, 2.48±0.06 and 2.75±0.06 Ma in Kinsei-Hoshino, 3.55±0.12 Ma in Tamarai, 3.59±0.09 and 3.53±0.10 Ma in Asahi, 2.87±0.23 Ma in Magane, 3.54±0.08 Ma in Usa, 3.92±0.09 Ma in Yamaura and 8.05±0.24 Ma in Bajo.Sericite age of Bajo deposit is 8.05 Ma, which is significantly older than those of other deposits. This is due to that relic muscovite of the host granitic rock mixed into the mineral separates to be dated. Newly and previously obtained K-Ar age data revealed that the gold deposits in outside of the Beppu-Shimabara Graben were formed in a period (1.5 million years) between 3.92 Ma and 2.48 Ma in Pliocene and that the gold mineralization occurred immediately after the end of major volcanic activity. The ages also show that the gold mineralization in Pliocene has close relationship with the volcanism.

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.60, no.3, pp.165-198, 2010 (Released:2013-07-18)

参考文献数

18

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

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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

森下 祐一

出版者

資源地質学会

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.63, no.1, pp.21-30, 2013 (Released:2016-01-10)

参考文献数

18

被引用文献数

1

著者

島崎 英彦 清水 正明 清水 マリナ

出版者

資源地質学会

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.49, no.1, pp.63-70, 1999-02-28 (Released:2009-06-12)

参考文献数

8

著者

澁江 靖弘

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.45, no.250, pp.121-127, 1995-04-28 (Released:2009-06-12)

参考文献数

31

著者

石原 舜三

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.58, no.2, pp.131-138, 2008-05-25 (Released:2010-02-23)

参考文献数

23

被引用文献数

3

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Bismuth can be supplied from two sources: primary Bi-bearing minerals concentrated in Sn-W polymetallic ore deposits, and by-product bismuth from sulfide concentrates from various ore deposits. The first example is best shown by the Shizhuyuan skarn-greisen-type Sn-W polymetallic deposits in southern China, and is still a major source for bismuth. This type of ore deposits occurs in carbonate rocks intruded by an ilmentie-series fractionated granite in a continental margin setting. New discovery of this type in a blind status, as exemplified at Nui Phao, northern Vietnam, is urgently needed, because the remaining ore reserves are only for 18 years.

著者

丸谷 雅治 東原 雅実 渡辺 寧 村上 浩康 小島 元 Boubou DIOUMASSI

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.55, no.1, pp.59-70, 2005-05-20 (Released:2009-06-12)

参考文献数

23

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The mining sector in the Islamic Republic of Mauritania was the backbone of the country's economy in the 1960s when Mauritania gained independence from France. However, mineral exploration has been limited due to several factors including the limited availability of geological information, poor legal and fiscal framework and lack of mining sector promotion measures as well as the vast scale of the country, severe climate and lack of infrastructure.In response to the request of the Mauritanian Government, Japan International Cooperation Agency conducted "the Study on the Strategic Plan of Mineral Resource Development". A geological survey was implemented from November 2003 to March 2005 in the areas of mineral potential in Mauritania with the purpose of promoting domestic and foreign private investments in the exploration of mineral resources.Mauritania comprises five geological provinces. These are the Reguibat Shield, Taoudeni Sedimentary Basin, Tindouf Sedimentary Basin, Mauritanides and Atlantic-Coastal Sedimentary Basin. Major metal ore deposits are distributed within both the Reguibat Shield and the Mauritanides.In the central area of the Reguibat Shield, magnetite formations occur in the Archean groups and large-scale highgrade hematite banded-iron formations occur in the lower Proterozoic groups. These deposits are the sources of iron ores that support Mauritania economy. In the southwestern area of the shield, epithermal; and mesothermal gold-bearing quartz network and disseminated deposits (e.g.Tasiast gold deposit) occur in banded iron formations (BIFs) of the Archean greenstone belt. Moreover, gold-bearing quartz vein deposits (e.g.Tijirit Ator gold deposit) occur in the basalt and ophicalcite units.The Mauritanides is most significant in copper and gold mineralization among the five geological provinces. These comprise a carbonate replacement magnetite-bearing copper and gold deposits and prospects (e.g.Guelb Moghrein deposit), copper and gold-bearing quartz veins in mafic schist and carbonate (e.g.Tabrinkout prospect), copper (and gold)-bearing quartz veins in andesitic to basaltic volcanic rocks (e.g.Indice 78 and Oudelemguil prospects) and disseminated copper deposits (e.g.Kadiar). The other important deposit type is orthomagmatic PGE-bearing chromite deposits in serpentinite (e.g.Guidimaka).In the future, it is desirable that exploration and development focus on gold deposits in the Reguibat Shield, and copper and gold deposits and platinum-bearing chromite deposits in the Mauritanides.

著者

村上 浩康 石原 舜三

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.58, no.2, pp.V-VI, 2008

著者

角田 謙朗 清水 正明

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.45, no.250, pp.111-120, 1995-04-28 (Released:2009-06-12)

参考文献数

15

被引用文献数

3

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Metallic mineralization in the Suehiro vein and its neighbouring veins of the Otome deposit was described. The metallic minerals of the Suehiro vein and its neighbouring veins are ferberite, pyrrhotite, less pyrite, chalcopyrite, sphalerite, molybdenite 2H, goethite, arsenopyrite, cubanite, Ag, Sb-bearing cosalite, bismuthinite, native bismuth, ingodite, Bi-bearing boulangerite, izoklakeite etc.The mineralization sequence at Otome can be divided into three stages, based on microscopic observation, EPM analyses and fluid inclusion data: Stage I (W mineralization), Stage II (sulphides and sulphosalts), and Stage III (hematite and goethite). Further, the stage II is subdivided into three substages. The fluid inclusion homogenization temperatures ranged from 350°to 250°C for stage I, from 330° to 150°C for stage II and lower than 150°C for stage III.Temperatures and sulfur activities of stage II mineralization at Otome are estimated as 330° to 150°C, and -11 to -20 in log aS2 (atm.), based on the FeS contents of sphalerite, mineral assemblages and fluid inclusion data.

著者

落合 清茂 田切 美智雄 田中 久雄

出版者

資源地質学会

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.43, no.4, pp.291-300, 1993-08-31

参考文献数

20

被引用文献数

1

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釜石鉱山の日峰鉱床と新山鉱床におけるスカルン帯のスカルン,およびザクロ石と単斜輝石について,コンドライトで規格した希土類元素(REE)パターンを示し,スカルン帯の生成過程でのREEのの挙動を解析した.スカルン帯は閃緑岩類と石灰岩との間に発達し,全岩のREEは閃緑岩側から石灰岩へと減少する.スカルンのREEは閃緑岩類に由来し,熱水溶液からの供給はほとんどなかったものと考えられる,単斜輝石は負のEu異常を示し,その大きさは閃緑岩側から石灰岩へと増大する.ザクロ石のEu異常は正まあたは負と大きく変動する.鉱物のEu<SUP>+2</SUP>/Eu<SUP>+3</SUP>比を決める主な要因は酸素フュガシティー(fo<SUB>2</SUB>)であり,単斜輝石の負のEu異常はfo<SUB>2</SUB>の減少と共に大きくなり,ザクロ石はEu<SUP>+3</SUP>をEu<SUP>+2</SUP>よりも優先的に取り込む.熱水溶液のfo<SUB>2</SUB>は石墨を含む石灰岩との交代反応により次第に減少した.ザクロ石のEu異常の大きな変化は,高いfo<SUB>2</SUB>をもった初生の熱水溶液と低いfo<SUB>2</SUB>の石灰岩との反応によって生じたfo<SUB>2</SUB>の変動の反映である.