Chemical composition of perthite, ilmenite, allanite and pyroxmangite occurred in pegmatites of vicinity of Iwaizumi Town, Iwate Prefecture

Omori, Keiichi; Hasegawa, Shuzo

doi:10.2465/ganko1941.39.91

Cited by 2 publications

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“…Descriptions of manganoan allanite from several localities of Japan by Omori & Hasegawa (1956) FIG. 5.…”

Section: Significance Of Manganese To the Origin And Crystallization mentioning

confidence: 99%

“…In Japan, allanite-(Ce), having an idealized formula (Ce,Ca,YMAI,Fe3+h(Si04h(OH), most commonly occurs in granite, granitic pegmatite, gabbroic pegmatite, monzonite pegmatite and granodiorite (Omori & Hasegawa 1956, Nagashima & Nagashima 1960, Hasegawa 1957, 1958, 1959, 1960, 1961, and rarely in metamorphic rocks (Sakai et al 1984, Banno 1993. Until the middle 1990s, the multiplicity of characteristic X-ray lines for REE precluded accurate electron-microprobe analysis (EPMA) of REE-bearing minerals.…”

Section: Introduction the Canadian Mineralogistmentioning

confidence: 99%

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ALLANITE-(Ce) IN GRANITIC ROCKS FROM JAPAN: GENETIC IMPLICATIONS OF PATTERNS OF REE AND Mn ENRICHMENT

Hoshino¹,

Kimata²,

Shimizu³

et al. 2006

The Canadian Mineralogist

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Twenty-two samples of allanite-(Ce) taken from granitic rocks in Japan have been characterized by electron-microprobe analysis. In back-scattered-electron (BSE) images, the allanite-(Ce) is homogeneous or characterized by various types of zoning features: oscillatory, normal or irregular types. Thirteen samples contain appreciable amounts of Mn (0.14-D.59 apfu). The Mnrich crystals (2-6 cm long) are larger than the crystals of Mn-poor allanite-(Ce) (0.5-2 cm long). Samples of the two groups differ considerably from each other in chondrite-normalized REE patterns: Mn-poor allanite-(Ce) is relatively rich in LREE, as is common in igneous allanite, whereas the Mn-ricli allanite-(Ce) exhibits an enrichment in the middle rare-earth elements (MREE). The relationship between Mn-rich and Mn-poor allanite-(Ce) is expressed by the coupled substitution Mn2+ + (MREE, HREEP+~Ca2+ + LREE3+. The presence of Mn-rich allanite-(Ce) in the Japanese island arc, in conjunction with occurrences of Mn-rich and REE-bearing epidote-group minerals in manganese deposits, support a link with subduction-zone processes. The granitic rocks containing Mn-poor allanite-(Ce) belong to the magnetite-series granitic rocks, whereas those containing Mn-rich allanite-(Ce) correspond to the ilmenite series, and seem to have formed from a volatile-enriched magma. Therefore, the Mn content in allanite-(Ce) contains petrogenetic information.

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“…Descriptions of manganoan allanite from several localities of Japan by Omori & Hasegawa (1956) FIG. 5.…”

Section: Significance Of Manganese To the Origin And Crystallization mentioning

confidence: 99%

Section: Introduction the Canadian Mineralogistmentioning

confidence: 99%

ALLANITE-(Ce) IN GRANITIC ROCKS FROM JAPAN: GENETIC IMPLICATIONS OF PATTERNS OF REE AND Mn ENRICHMENT

Hoshino¹,

Kimata²,

Shimizu³

et al. 2006

The Canadian Mineralogist

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The distribution of manganese and iron between ilmenite and granitic magma in the �sumi Peninsula, Japan

Tsusue

1973

Contr. Mineral. and Petrol.

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Chemical composition of perthite, ilmenite, allanite and pyroxmangite occurred in pegmatites of vicinity of Iwaizumi Town, Iwate Prefecture

Cited by 2 publications

References 0 publications

ALLANITE-(Ce) IN GRANITIC ROCKS FROM JAPAN: GENETIC IMPLICATIONS OF PATTERNS OF REE AND Mn ENRICHMENT

ALLANITE-(Ce) IN GRANITIC ROCKS FROM JAPAN: GENETIC IMPLICATIONS OF PATTERNS OF REE AND Mn ENRICHMENT

The distribution of manganese and iron between ilmenite and granitic magma in the �sumi Peninsula, Japan

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