研究者詳細 - 淺原　良浩

論文 - 淺原　良浩

分割表示 131 件中 41 - 60 件目／全件表示 >>

A new perspective on Cenozoic calc-alkaline and shoshonitic volcanic rocks, eastern Saveh (central Iran) 査読有り国際共著国際誌

Nouri, F., Azizi, H., Asahara, Y., Stern, R.J.

International Geology Review 63 巻 ( 4 ) 頁： 476 - 503 2021年3月

Petrogenesis of the Carboniferous Ghaleh-Dezh metagranite, Sanandaj-Sirjan zone, Iran: constraints from new zircon U-Pb and ⁴⁰Ar/³⁹Ar ages and Sr-Nd isotopes 査読有り国際共著国際誌

Shabanian, N., Davoudian, A.R., Azizi, H., Asahara, Y., Neubauer, F., Genser, J., Dong, Y., Lee, J.K.W.

Geological Magazine 157 巻 ( 11 ) 頁： 1823 - 1852 2020年11月

Long-lived, Eocene-Miocene stationary magmatism in NW Iran along a transform plate boundary 査読有り国際共著国際誌

Rabiee, A., Rossetti, F., Asahara, Y., Azizi, H., Lucci, F., Lustrino, M., Nozaem, R.

Gondwana Research 85 巻頁： 237 - 262 2020年9月

New evidence for Jurassic continental rifting in the northern Sanandaj Sirjan Zone, western Iran: the Ghalaylan seamount, southwest Ghorveh 査読有り国際共著国際誌

Azizi, H., Nouri, F., Stern, R.J., Azizi, M., Lucci, F., Asahara, Y., Zarinkoub, M.H., Chung, S.L.

International Geology Review 62 巻 ( 13-14 ) 頁： 1635 - 1657 2020年9月

Zircon U-Pb dating, mineralogy and geochemical characteristics of the gabbro and gabbro-diorite bodies, Boein-Miandasht, western Iran 査読有り国際共著国際誌

Tavakoli, N., Davoudian, A.R., Shabanian, N., Azizi, H., Neubauer, F., Asahara, Y., Bernroider, M.

International Geology Review 62 巻頁： 1658 - 1676 2020年9月

Geochemical and Sr-Nd isotopic constraints on the genesis of the Soheyle-PaKuh granitoid rocks (central Urumieh-Dokhtar magmatic belt, Iran) 査読有り国際共著国際誌

Sarjoughian, F., Javadi, S., Azizi, H., Ling, W., Asahara, Y. and Lentz, D.

International Geology Review 62 巻頁： 1769 - 1795 2020年9月

Sequential magma injection with a wide range of mixing and mingling in Late Jurassic plutons, southern Ghorveh, western Iran 査読有り国際共著国際誌

Azizi, H., Asahara, Y., Minami, M., Anma, R.

Journal of Asian Earth Sciences 200 巻頁： 104469 2020年9月

Rare earth elements and Sr isotope ratios of large apatite crystals in Ghareh Bagh mica mine, NW Iran: Tracing for Petrogenesis and Mineralization 査読有り国際共著国際誌

Daneshvar, N., Azizi, H., Asahara, Y., Tsuboi, M., Hosseini, M.

Minerals 10 巻 ( 9 ) 頁： 833 2020年9月

Petrology and geochemistry of the Lattan Mountain magmatic rocks in the Sanandaj-Sirjan Zone, west of Iran 査読有り国際共著国際誌

Ahankoub, M., Asahara, Y., Tsuboi, M.

Arabian Journal of Geosciences 13 巻 ( 16 ) 頁： 809 2020年8月

Variability of protoliths and pressure-temperature conditions of amphibolites from the Ohmachi Seamount (Izu-Bonin-Mariana arc): evidence of a fossil subduction channel in a modern intra-oceanic arc 査読有り国際誌

Imayama, T., Ueda, H., Usuki, T, Minami, M., Asahara, Y., Nagahashi, T.

Mineralogy and Petrology 114 巻頁： 305 - 318 2020年8月

Systematic variation in rare earth element patterns from a felsic granulite of the Jirisan complex, Yeongnam Massif, Korea 査読有り国際共著国際誌

Lee, S.G., Song, Y.S., Asahara, Y., Tanaka, T., Park, K.H.

Geochemical Journal 54 巻 ( 4 ) 頁： 183 - 194 2020年8月

Investigation of rare earth elements (REEs) as exploration potential in intrusive bodies in the northern Sanandaj-Sirjan zone (Kurdistan area), western Iran 査読有り国際共著国際誌

Azizi, H., Maghsoudloo, A., Nouri, F., Asahara, Y., Yamamoto, K., Minami, M., Tsuboi, M.

Geochemical Journal 54 巻 ( 4 ) 頁： 221 - 232 2020年8月

A chronological and geochemical study of the Tadamigawa older-stage granites: igneous activity in the west of the Tanakura Tectonic Line (TTL) of northeastern Japan 査読有り国際誌

Wakasugi, Y., Wakaki, S., Tanioka, Y., Ichino, K., Tsuboi, M., Asahara, Y., Noda, A.

Geochemical Journal 54 巻 ( 4 ) 頁： 203 - 220 2020年8月

Integrated Neogene biochemostratigraphy at DSDP Site 296 on the Kyushu-Palau Ridge in the western North Pacific 査読有り国際誌

Matsui, H., Horikawa, K., Chiyonobu, S., Itaki, T., Ikehara, M., Kawagata, S., Wakaki-Uchimura, H., Asahara, Y., Seki, O., Okazaki, Y.

Newsletters on Stratigraphy 53 巻頁： 313 - 331 2020年6月

Detrital Sr-Nd isotopes, sediment provenances and depositional processes in the Laxmi Basin of the Arabian Sea during the last 800 ka 査読有り国際共著国際誌

Khim, B.K., Horikawa, K., Asahara, Y., Kim, J.E, Ikehara, M.

Geological Magazine 157 巻頁： 895 - 907 2020年6月

Anatomy of the magmatic plumbing system of Los Humeros Caldera (Mexico): implications for geothermal systems 査読有り国際共著国際誌

Lucci, F., Carrasco-Núñez, G., Rossetti, F., Theye, T., White, J.C., Urbani, S., Azizi, H., Asahara, Y., Giordano, G.

Solid Earth 11 巻頁： 125 - 159 2020年1月

Petrogenesis and geodynamic implications of an Ediacaran (550Ma) granite complex (metagranites), southwestern Saqqez, northwest Iran 査読有り国際共著国際誌

Daveshvar, N., Maanijou, M, Azizi, H., Asahara, Y.

Journal of Geodynamics 132 巻頁： 101669 2019年12月

Late Paleocene adakitic granitoid from NW Iran and comparison with adakites in the NE Turkey: Adakitic melt generation in normal continental crust 査読有り国際共著国際誌

Azizi, H, Stem, R.J, Topuz, G, Asahara, Y, Moghadam, H.S.

Lithos 346 巻頁： 105151 2019年11月

Common occurrence of calcic plagioclase in granitoids from Mt. Kaizuki area, central Japan 査読有り国際共著国際誌

Hong Mei, Enami, M, Tsuboi, M, Asahara, Y

Journal of Mineralogical and Petrological Sciences 114 巻 ( 4 ) 頁： 201 - 213 2019年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Japan Association of Mineralogical Sciences

<p>Calcic plagioclase with anorthite (An) content of up to 91% commonly occurs in coexistence with the sodic phase (An<sub><40–50</sub>) in the Cretaceous Kaizuki–yama (Mt. Kaizuki) granitoid body that intrudes into the Mino belt of the Jurassic accretionary sediment complex in central Japan. The Kaizuki–yama granitoids are mainly composed of plagioclase, K–feldspar, quartz, and biotite with subordinate amounts of amphibole, ilmenite, and apatite. The sodic plagioclase grains show common igneous–type normal zoning with decreasing anorthite content toward the rim. In most cases, the calcic plagioclase occurs as a crystal core, which is discontinuously surrounded by a sodic mantle. The calcic parts rarely show fine and nebular texture with sodic domains; however, a thin calcic zone (100–150 µm in width) develops along the boundary between the nebular core and the sodic mantle. In the nebular core, calcic plagioclase sometimes rims the fine–grained calcite, prehnite, and zoisite/epidote (less than 10–20 µm in size). Most amphibole grains have ferropargasite/ferrohornblende compositions and are usually rimmed by secondary ferro–actinolite. Although the pressure/temperature conditions estimated based on amphibole–plagioclase equilibria vary widely between samples, they show systematic decreases in pressure with decreasing temperature from 0.5 GPa/800 °C to approximately 0.2 GPa/700 °C. Some anorthite–rich plagioclase grains may have been xenocrystic and/or antecrystic in origins, and others were crystallized from calcic part of locally heterogeneous magma. The incorporation of calcic plagioclase into the felsic magma and the locally calcic environment probably resulted from the assimilation of skarn and related calcareous rocks consisting of the wall rocks of the Kaizuki–yama body during magmatic intrusion and solidification.</p>

DOI： 10.2465/jmps.190118

Web of Science

Litho-, bio-, and chemostratigraphy of the Middle Triassic carbonate succession in the North-Central Coast Region of Vietnam 査読有り国際共著国際誌

Thuy Thi Nhu Ha, Takayanagi, H., Ueno, K., Asahara, Y., Yamamoto, K., Iryu, Y.

Progress in Earth and Planetary Science 6 巻頁： 47 2019年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer

Middle Triassic carbonates extend from the North-Central Coast region of Vietnam to northern Laos. We conducted sedimentological, paleontological, and geochemical analyses on the carbonates of the Hoang Mai Formation in Nghe An province, Vietnam. The carbonates consist of the following six lithostratigraphic units (from bottom to top): sandy limestone (unit 1), peloidal packstone with a microbialite interlayer (unit 2), peloidal packstone and oncoidal floatstone (unit 3), peloidal–bioclastic packstone (unit 4), peloidal packstone with variable quantities of bioclasts and microbialite (unit 5), and peloidal packstone with variable quantities of bioclasts (unit 6). The sandy nature of unit 1 and of three of the interlayers in unit 2 indicates a supply of terrigenous material during the early stages of formation of the Hoang Mai carbonate platform. The dominance of carbonates with a fine-grained matrix throughout the overlying succession implies a low-energy depositional environment. Common occurrences of dasycladalean algae in units 4–6 indicate a back-reef lagoon environment. A total of 24 foraminiferal taxa, including Citaella dinarica and C. deformata, were identified. These two age-diagnostic species occur in units 3–6, suggesting that this interval is correlated with the Pelsonian and that the lower units (units 1–2) are potentially correlated with the Bithynian. Thus, the entire core section can be assigned to the middle Anisian (lower Middle Triassic). An assessment of the diagenetic alteration using geochemical parameters indicates that the carbonates of the studied succession have not retained their initial strontium (87Sr/86Sr) and oxygen (δ18O) isotope compositions. In contrast, the carbonates in the lower (units 1–2) and middle (units 2–5) intervals have retained their initial carbon isotope compositions (δ13C), making them suitable for C isotopic analyses. In the lower interval, we observe a slight δ13C-enrichment, followed by a gradual δ13C-depletion upwards into the middle interval. The observed trend in δ13C values from the Hoang Mai Formation can be correlated with similar trends reported from South China and Romania. Samples within the upper interval (units 5–6) of the Vietnamese δ13C profile are relatively δ13C-depleted, which is likely the result of diagenetic overprinting.

DOI： 10.1186/s40645-019-0293-y

Web of Science

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