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Tetsumaru Itaya
Okayama University of Science
222Publications
35H-index
4,008Citations
Publications 224
Newest
#1Yasu'uchi KubotaH-Index: 2
#2Toru Takeshita (Hokkaido University)H-Index: 21
Last.Tetsumaru ItayaH-Index: 35
view all 4 authors...
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#1Yasu'uchi KubotaH-Index: 2
#2Toru TakeshitaH-Index: 21
Last.Tetsumaru ItayaH-Index: 35
view all 4 authors...
#1C. Ishwar-Kumar (IISc: Indian Institute of Science)H-Index: 6
#2V.J. Rajesh (IIST: Indian Institute of Space Science and Technology)H-Index: 12
Last.Krishnan Sajeev (IISc: Indian Institute of Science)H-Index: 21
view all 7 authors...
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#1C. Ishwar-KumarH-Index: 6
#2V.J. RajeshH-Index: 12
Last.Krishnan SajeevH-Index: 21
view all 7 authors...
The Ranomena ultramafic complex in NE Madagascar consists of layered gabbro, harzburgite, orthopyroxenite, clinopyroxenite, garnet websterite and chromitite-layered peridotite. This study of the Ranomena chromite chemistry aims to better understand the petrogenesis and palaeotectonic environment of the complex. The chromite from the Ranomena chromitite is unzoned/weakly zoned and has a Cr# (Cr/(Cr + Al)) of 0.59-0.69, a Mg# (Mg/(Fe + Mg)) of 0.37-0.44, and low Al2O3 (15-23 wt %) suggesting deriv...
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#1Tetsumaru ItayaH-Index: 35
#2Hironobu Hyodo (Okayama University of Science)H-Index: 14
Last.Chiara Groppo (UNITO: University of Turin)H-Index: 21
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#1Teruyoshi Imaoka (Yamaguchi University)H-Index: 9
#2Hiroshi Kawabata (Kōchi University)H-Index: 18
Last.Michio KijiH-Index: 4
view all 8 authors...
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
#1Hisashi Asanuma (TITech: Tokyo Institute of Technology)H-Index: 3
#2Wataru Fujisaki (TITech: Tokyo Institute of Technology)H-Index: 6
Last.Brian F. Windley (University of Leicester)H-Index: 74
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•We obtained new isotopic data (zircon U-Pb and phengite K-Ar ages) in Mona Complex.•Sedimentation of the Monian Supergroup occurred on the margin of the Amazonian craton.•The blueschist facies metamorphism occurred in the interval ca. 574–530Ma.•The epidote-amphibolite facies rocks were exhumed in the interval ca. 578–575Ma.•Deposition of the Gwna Group predated that of the South Stack and New Harbour Groups.
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#1Tetsumaru ItayaH-Index: 35
#2Koshi YagiH-Index: 8
Last.Chiara Groppo (UNITO: University of Turin)H-Index: 21
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#1Hoang Bac Bui (Hanoi University of Mining and Geology)H-Index: 2
#2Xuan Thanh Ngo (Hanoi University of Mining and Geology)H-Index: 2
Last.Koshi YagiH-Index: 8
view all 7 authors...
Abstract Constraining the timing of fault zone origin and movement history is of fundamental geotectonic importance to understand the evolution and processes of the brittle fault structures. The authors present in this paper authigenic illite K-Ar age data from the fault gouge samples, collected from the Dien Bien Phu Fault (DBPF) in the Dien Bien province, Vietnam as well as in a major strike-slip fault zone in South-East Asia; all of which played important roles in the structural formation and...
6 CitationsSource
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