Search results for: T. Itaya

Items from 1 to 20 out of 31 results

article

Petrogenesis and tectonic setting of the Bondla mafic-ultramafic complex, western India: Inferences from chromian spinel chemistry

C. Ishwar-Kumar, V.J. Rajesh, B.F. Windley, T. Razakamanana, more

Journal of Asian Earth Sciences > 2016 > 130 > C > 192-205

Crustal-scale shear/suture zones hold prime importance because they are one of the critical parameters used for paleogeographic configurations of supercontinental assemblies. The Kumta suture, located on the western margin of peninsular India, has been interpreted as the eastern extension of the Betsimisaraka suture zone of Madagascar. This suture separates the Karwar block (ca. 3200Ma tonalite-trondhjemite-granodiorite...

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Mesoproterozoic suturing of Archean crustal blocks in western peninsular India: Implications for India–Madagascar correlations

C. Ishwar-Kumar, M. Santosh, S.A. Wilde, T. Tsunogae, more

Lithos > 2016 > 263 > C > 143-160

The Kumta and Mercara suture zones welding together Archean crustal blocks in western peninsular India offer critical insights into Precambrian continental juxtapositions and the crustal evolution of eastern Gondwana. Here we present the results from an integrated study of the structure, geology, petrology, mineral chemistry, metamorphic P–T conditions, zircon U–Pb ages and Lu–Hf isotopes of metasedimentary...

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Evolution of high-pressure mafic granulites and pelitic gneisses from NE Madagascar: Tectonic implications

C. Ishwar-Kumar, K. Sajeev, B.F. Windley, T.M. Kusky, more

Tectonophysics > 2015 > 662 > Complete > 219-242

The occurrence of high-pressure mafic–ultramafic bodies within major shear zones is one of the indicators of paleo-subduction. In mafic granulites of the Andriamena complex (north-eastern Madagascar) we document unusual textures including garnet–clinopyroxene–quartz coronas that formed after the breakdown of orthopyroxene–plagioclase–ilmenite. Textural evidence and isochemical phase diagram calculations...

article

Neoarchean arc magmatism followed by high-temperature, high-pressure metamorphism in the Nilgiri Block, southern India

Vinod O. Samuel, K. Sajeev, T. Hokada, K. Horie, more

Tectonophysics > 2015 > 662 > Complete > 109-124

The Nilgiri Block, southern India is an exhumed lower crust formed through arc magmatic processes in the Neoarchean. The main lithologies in this terrane include charnockites, gneisses, volcanic tuff, metasediments, banded iron formation and mafic–ultramafic bodies. Mafic–ultramafic rocks are present towards the northern and central part of the Nilgiri Block. We examine the evolution of these mafic...

article

SIMS zircon U–Pb and mica K–Ar geochronology, and Sr–Nd isotope geochemistry of Neoproterozoic granitoids and their bearing on the evolution of the north Eastern Desert, Egypt

H.A. Eliwa, C. Breitkreuz, M. Murata, I.M. Khalaf, more

Gondwana Research > 2014 > 25 > 4 > 1570-1598

Granitic rocks are commonly used as means to study chemical evolution of continental crust, particularly, their isotopic compositions, which reflect the relative contributions of mantle and crustal components in their genesis. New SIMS and K–Ar geochronology, isotope, geochemical, and mineral chemistry data are presented for the granitoid rocks located in and around Gabal Dara in the Northern Eastern...

article

Episodic magmatism at 105Ma in the Kinki district, SW Japan: Petrogenesis of Nb-rich lamprophyres and adakites, and geodynamic implications

T. Imaoka, K. Nakashima, A. Kamei, T. Itaya, more

LITHOS > 2014 > 184-187 > Complete > 105-131

Cretaceous episodic magmatism produced Nb-rich lamprophyres and adakitic granitoids in the Kinki district of SW Japan. K–Ar dating of minerals from the lamprophyres, adakites, and hornblende peridotite xenoliths yielded ages of 109–99Ma, indicating a short-lived episodic magmatism. The lamprophyres generally display primitive high-Mg basaltic to basaltic andesite compositions with high Mg# and high...

article

A Rodinian suture in western India: New insights on India-Madagascar correlations

C. Ishwar-Kumar, B.F. Windley, K. Horie, T. Kato, more

Precambrian Research > 2013 > 236 > Complete > 227-251

We report detailed evidence for a new paleo-suture zone (the Kumta suture) on the western margin of southern India. The c. 15-km-wide, westward dipping suture zone contains garnet-biotite, fuchsite-haematite, chlorite-quartz, quartz-phengite schists, biotite augen gneiss, marble and amphibolite. The isochemical phase diagram estimations and the high-Si phengite composition of quartz-phengite schist...

article

Structural analysis of nano structured carbon by transmission electron microscopy and image processing

K. Oshida, M. Murata, K. Fujiwara, T. Itaya, more

Applied Surface Science > 2013 > 275 > Complete > 409-412

Transmission electron microscopy (TEM) is one of the highest resolution analysis methods of materials. The three dimensional recognition of the materials is difficult by TEM because the observation data is projection images through the materials. In this study, space structure of carbon nanotubes loaded with metal particles was analyzed by three dimensional TEM (3D-TEM) [1,2]. The nano structured...

article

Effect of GDF‐5 and BMP‐2 on the expression of tendo/ligamentogenesis‐related markers in human PDL‐derived cells

M Inoue, K Ebisawa, T Itaya, T Sugito, more

Oral Diseases > 18 > 2 > 206 - 212

Oral Diseases (2012) 18, 206–212 Objectives: The effect of growth differentiation factor 5 and bone morphogenetic protein 2 on human periodontal ligament‐derived cells was investigated with special reference to tendo/ligamentogenesis‐related markers. Materials and Methods: Effects of each factor were analyzed by quantitative PCR for scleraxis and tenomodulin and by western blotting for scleraxis...

article

Eddy current distribution for a rectangular coil arranged parallel to a moving conductor slab

T. Itaya, K. Ishida, A. Tanaka, N. Takehira, more

IET Science, Measurement & Technology > 2012 > 6 > 2 > 43 - 51

The behaviour of an eddy current strongly depends on factors such as coil shape, excitation frequency, conductor speed and conductor properties. To analyse the inverse problem (i.e. processing eddy-current-testing data), it is particularly important to quantitatively evaluate the eddy current. In this study, the authors derive an analytical solution for the eddy current distribution for a rectangular...

article

Multiple garnet growth in garnet–kyanite–staurolite gneiss, Pangong metamorphic complex, Ladakh Himalaya: New constraints on tectonic setting

N.X. Thanh, K. Sajeev, T. Itaya, B.F. Windley

LITHOS > 2011 > 127 > 3-4 > 552-563

Garnet–kyanite–staurolite gneiss in the Pangong complex, Ladakh Himalaya, contains porphyroblastic euhedral garnets, blades of kyanite and resorbed staurolite surrounded by a fine-grained muscovite-biotite matrix associated with a leucogranite layer. Sillimanite is absent. The gneiss contains two generations of garnet in cores and rims that represent two stages of metamorphism. Garnet cores are extremely...

article

K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation

T. Imaoka, K. Kiminami, K. Nishida, M. Takemoto, more

Journal of Asian Earth Sciences > 2011 > 40 > 2 > 509-533

Systematic K–Ar dating and geochemical analyses of Paleogene cauldrons in the Sanin Belt of SW Japan have been made to explore the relationship between the timing of their formation and the Paleogene subduction history of SW Japan documented in the Shimanto accretionary complex. We also examine the magma sources and tectonics beneath the backarc region of SW Japan at the eastern plate boundary of...

article

Arbitrary-shaped single-layer coil self-inductance using shape functions

K Ishida, T Itaya, A Tanaka, N Takehira, more

IET Science, Measurement & Technology > 2011 > 5 > 1 > 21 - 27

Coils of various shapes are used in various applications such as sensing and magnetic energy storage. Successful practical application of coils requires knowledge about their self-inductance, which is one of their fundamental properties. In the past, approximation analyses have been performed on coils of various shapes by means of theoretical analysis methods and finite element methods. In this paper,...

article

Mineral chemistry and K–Ar ages of plutons across the Karakoram fault in the Shyok-Nubra confluence of northern Ladakh Himalaya, India

N.X. Thanh, T. Itaya, T. Ahmad, S. Kojima, more

Gondwana Research > 2010 > 17 > 1 > 180-188

Petrographic analyses of plutons across the Karakoram fault in the Shyok-Nubra confluence of northern Ladakh area revealed that the rocks consist of diorite, granodiorite, granite and leucogranite. Pyroxene and biotite chemistries by EPMA indicate that most of the diorite, granodiorite and granite are calc-alkaline and formed in an arc-related tectonic setting. These calc-alkaline plutons yield K–Ar...

article

High P–T granulite relicts from the Imjingang belt, South Korea: Tectonic significance

K. Sajeev, Jaehoon Jeong, Sanghoon Kwon, Weon-Seo Kee, more

Gondwana Research > 2010 > 17 > 1 > 75-86

This study presents a detailed description on crustal metamorphic signatures of garnet–clinopyroxene–quartz–rutile-bearing high P–T granulites, Samgot unit, Imjingang belt, northwestern Korean Peninsula that formed during Permo-Triassic regional metamorphism related to the amalgamation of East Asian continental fragments. Lenses and blocks of high P–T granulites and garnet-bearing leucosomes occur...

article

Counterclockwise exhumation of a hot orogen: The Paleoproterozoic ultrahigh-temperature granulites in the North China Craton

M. Santosh, K. Sajeev, J.H. Li, S.J. Liu, more

LITHOS > 2009 > 110 > 1-4 > 140-152

Regional metamorphic belts provide important constraints on the plate tectonic architecture of orogens. We report here a detailed petrologic examination of the sapphirine-bearing ultra-high temperature (UHT) granulites from the Jining Complex within the Khondalite Belt of the North China Craton (NCC). These granulites carry diagnostic UHT assemblages and their microstructures provide robust evidence...

article

Analysis of a fork-shaped rectangular coil facing moving sheet conductors

T. Itaya, K. Ishida, A. Tanaka, N. Takehira

IET Science, Measurement & Technology > 2009 > 3 > 4 > 279 - 285

The electromagnetic induction method utilising eddy current plays an important role in a non-destructive material test. In testing slab-type material by electromotive force method, there is the fork-shaped coil method, which has two coils placed on both sides of the test piece. In most studies, circular coils have been analysed. However, it has been pointed out quantitatively that a rectangular coil...

article

Magnetic Field Analysis of an Arbitrary Shaped Coil Using Shape Functions

K. Ishida, T. Itaya, A. Tanaka, N. Takehira

IEEE Transactions on Magnetics > 2009 > 45 > 1-1 > 104 - 112

In eddy-current sensors and eddy-current testing, it is important to analyze the magnetic field of the coil. Toward this end, we analyzed magnetic fields in various coils, such as circular and rectangular coils. We used the double Fourier transformation and applied it to the eddy-current problem of coils facing a sheet conductor. However, only a limited number of coil shapes could be analyzed by this...

article

Micro-chronology and evolution of the planet Earth

T. Itaya, K. Sajeev, C. Clark, M.A. Kusiak

Gondwana Research > 2008 > 14 > 4 > 567-568

article

Metamorphic evolution of Neoproterozoic metapelites and gneisses in the Sinai, Egypt: Insights from petrology, mineral chemistry and K–Ar age dating

H.A. Eliwa, M.M. Abu El-Enen, I.M. Khalaf, T. Itaya, more

Journal of African Earth Sciences > 2008 > 51 > 3 > 107-122

Petrology, mineral chemistry, and age dating of the metapelitic schists and gneisses in three metamorphic complexes of Sinai have been studied and reported with the aims of characterizing the nature, type, and age of metamorphism as well as the metamorphic evolution of the Sinai metamorphic complexes. Nine representative samples of metapelitic schists, migmatites, and gneisses from the Taba Metamorphic...

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Search results for: T. Itaya

Petrogenesis and tectonic setting of the Bondla mafic-ultramafic complex, western India: Inferences from chromian spinel chemistry

Mesoproterozoic suturing of Archean crustal blocks in western peninsular India: Implications for India–Madagascar correlations

Evolution of high-pressure mafic granulites and pelitic gneisses from NE Madagascar: Tectonic implications

Neoarchean arc magmatism followed by high-temperature, high-pressure metamorphism in the Nilgiri Block, southern India

SIMS zircon U–Pb and mica K–Ar geochronology, and Sr–Nd isotope geochemistry of Neoproterozoic granitoids and their bearing on the evolution of the north Eastern Desert, Egypt

Episodic magmatism at 105Ma in the Kinki district, SW Japan: Petrogenesis of Nb-rich lamprophyres and adakites, and geodynamic implications

A Rodinian suture in western India: New insights on India-Madagascar correlations

Structural analysis of nano structured carbon by transmission electron microscopy and image processing

Effect of GDF‐5 and BMP‐2 on the expression of tendo/ligamentogenesis‐related markers in human PDL‐derived cells

Eddy current distribution for a rectangular coil arranged parallel to a moving conductor slab

Multiple garnet growth in garnet–kyanite–staurolite gneiss, Pangong metamorphic complex, Ladakh Himalaya: New constraints on tectonic setting

K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation

Arbitrary-shaped single-layer coil self-inductance using shape functions

Mineral chemistry and K–Ar ages of plutons across the Karakoram fault in the Shyok-Nubra confluence of northern Ladakh Himalaya, India

High P–T granulite relicts from the Imjingang belt, South Korea: Tectonic significance

Counterclockwise exhumation of a hot orogen: The Paleoproterozoic ultrahigh-temperature granulites in the North China Craton

Analysis of a fork-shaped rectangular coil facing moving sheet conductors

Magnetic Field Analysis of an Arbitrary Shaped Coil Using Shape Functions

Micro-chronology and evolution of the planet Earth

Metamorphic evolution of Neoproterozoic metapelites and gneisses in the Sinai, Egypt: Insights from petrology, mineral chemistry and K–Ar age dating

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