Kazuo Nakashima
Yamagata University
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Publications 60
#1Mohammad Reza Ghasempour (Shahrekord University)
#2Ali Reza Davoudian (Shahrekord University)H-Index: 7
Last. Kazuo Nakashima (YU: Yamagata University)H-Index: 9
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Abstract The Horjand area is part of the Kashmar-Kerman tectonic zone in the Central Iranian block, where the oldest continental crust of Iran can be found. Mafic igneous rocks associated with sedimentary units (gypsum, shale, limestone, dolomite and sandstone) belong to the magmatism of the Late Neoproterozoic–Early Cambrian Desu Series. Based on petrographic studies, the mafic igneous rocks comprise medium to coarse gabbro, micro-gabbro and hornblende-gabbro. The rocks mainly consist of plagio...
In the southeastern part of the Jebal-E-Barez Oligocene granitoids (Kerman province, Iran), there are numerous mafic dikes and this work attempts to investigate the petrological, geochemical and mineral chemistry of these dikes. The dikes clearly follow faults which trend mainly N50-70W and N20-40W. Their thicknesses vary from 1 cm to 3 m and their contacts with the host granitic rocks are sharp without any extensive contact metamorphism which may be due to the lack of magmatic fluids. The Jebal...
#1Rezvan Mirzaei (University of Sistan and Baluchestan)H-Index: 1
#2Ali Ahmadi (University of Sistan and Baluchestan)H-Index: 2
Last. Mohammad Boomeri (University of Sistan and Baluchestan)H-Index: 4
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Abstract Genesis of magnetite from Gol-Gohar iron deposit (GGID) of southeastern Iran is studied with reference to elemental composition. More than 1.2 billion tonnes of magnetite ore at 58% total Fe is hosted by greenschist- to amphibolite-facies metapelites and magnesian marbles. The GGID occurs in the mainly-metamorphic terrain of Sanandaj-Sirjan geological province, with continental-margin tectonic setting. The magnetite-bearing ore is divided into two distinct types of massive and banded; t...
2 CitationsSource
#1Teruyoshi Imaoka (Yamaguchi University)H-Index: 9
#2Hiroshi Kawabata (Kōchi University)H-Index: 18
Last. Michio KijiH-Index: 4
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Abstract We studied a 107 Ma vogesite (a kind of lamprophyre with alkali-feldspar > plagioclase, and hornblende ± clinopyroxene ± biotite) dike in the Kinki district of the Tamba Belt, Kyoto Prefecture, SW Japan, using petrography, mineralogy, K–Ar ages, and geochemistry to evaluate its petrogenesis and tectonic implications. The dike has the very specific geochemical characteristics of a primitive high-Mg basalt, with 48–50 wt.% SiO 2 (anhydrous basis), high values of Mg# (67.3–72.4), and high ...
4 CitationsSource
#1S. Murao (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 8
#2K. Sera (Iwate Medical University)H-Index: 16
Last. Kazuo Nakashima (YU: Yamagata University)H-Index: 9
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Recent rise of social attention towards ethical jewelry has led scientists to a challenge of how to construct analytical systems that can deliver in line with social and supply chain expectations. ...
#1Brajesh Singh (Kumaun University)H-Index: 2
#2Santosh Kumar (Kumaun University)H-Index: 11
Last. Kazuo Nakashima (YU: Yamagata University)H-Index: 9
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Felsic magmatism in the southern part of Himachal Higher Himalaya is constituted by Neoproterozoic granite gneiss (GGn), Early Palaeozoic granitoids (EPG) and Tertiary tourmaline-bearing leucogranite (TLg). Magnetic susceptibility values (<3 ×10−3 SI), molar Al2 O 3/(CaO + Na2 O + K 2O) (≥1.1), mineral assemblage (bt–ms–pl–kf–qtz ± tur ± ap), and the presence of normative corundum relate these granitoids to peraluminous S-type, ilmenite series (reduced type) granites formed in a syncollisional t...
1 CitationsSource
#1Yuya IzuminoH-Index: 2
#2Teruyuki Maruoka (University of Tsukuba)H-Index: 16
Last. Kazuo Nakashima (YU: Yamagata University)H-Index: 9
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The relationship between bismuth (Bi) mineral speciation and redox state in three types of granitoids from the Uetsu region, northeast Japan is investigated. Electron microprobe analysis of Bi minerals, sphalerite, Mg-Fe-bearing carbonate minerals, and muscovite, as well as sulfur isotope analysis of sulfide minerals and microthermometric study of fluid inclusions reveal that Bi mineral speciation varies according to the redox state of the granitoids. For example, native bismuth and bismuthinite...
1 CitationsSource
#1Yuka Sasaki (Yamaguchi University)H-Index: 1
#2Teruyoshi Imaoka (Yamaguchi University)H-Index: 9
Last. Tetsumaru Itaya (Okayama University of Science)H-Index: 35
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The relationship between the magmatism of the Cretaceous Ofuku pluton and mineralization in and around the Akiyoshi Plateau, Yamaguchi Prefecture, Japan was investigated using a combination of field observation, petrographic and geochemical analyses, K–Ar geochronology, and fluid inclusion data. The Ofuku pluton has a surface area of 1.5 × 1.0 km, and was intruded into the Paleozoic accretionary complexes of the Akiyoshi Limestone, Ota Group and Tsunemori Formation in the western part of the Aki...
1 CitationsSource