On the chloritoid bearing rocks from Kawai, Shimohei-gun, Iwate Prefecture

Onuki Hitoshi

doi:10.2465/ganko1941.44.300

Bibliographic Information

Other Title

岩手県下閉伊郡川井村の含クロリトイド岩

Description

The chloritoid-bearing rocks derived from tuffaceous material have been found in Kawai, Shimohei-gun, Iwate Prefecture. These chloritoid-bearing rocks contain sericite and chlorite as index minerals of the quartz-albite-sericite-chlorite sub-facies in the green schist facies. As compared with so-called “Kitakami median zone” where cloritoid-bearing rocks are found in various zones of the contact metamorphic aureole of the Tono granodiorite intrusion, in this area, these rocks are found only in a lower grade zone. The chemical composition of these chloritoid-bearing and their related rocks are studied. The chemical composition, optical properties and X-ray powder diffraction data of the separated chloritoid by the isodynamic magnetic separator have been investigated. The chemical formura and optical properties of this chloritoid are<br> (Fe⁺⁺_0.74 Fe⁺⁺⁺_{0, 18} Mg_0.05 Ca_0.02 Mn_0.00)_0.99 Al_1.91 Si_1.08 (OH)_1.78 O_5.22 and α=1.721 β=1.725 γ=1.729 2V_γ=60°. These resulting data, nearly equal the nature of the theoretical chloritoid. Some geological and petrological consideration of these chloritoid-bearing rocks are discussed.

Journal

The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists

The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 44 (6), 300-306, 1960

Japan Association of Mineralogical Sciences

Details 詳細情報について

CRID: 1390001206216454400

NII Article ID: 130003883845

DOI: 10.2465/ganko1941.44.300

ISSN: 18830765; 00214825

Data Source

JaLC
Crossref
CiNii Articles

Abstract License Flag: Disallowed

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