四国西部秩父帯石灰岩の不溶性残渣

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概要

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• Insoluble residues from 61 samples of limestone have been examined to get data about the provenance and depositional environment of the sedimentary series of the Chichibu belt in western Shikoku in addition to the previously reported data of non-calcareous rocks (KASHIMA, 1969). Results of heavy mineral analysis (Tables 2, 3, Fig. 1) suggest that the source of the detrital component of the limestone in western Shikoku can be ascribed to ultrabasic and basic igneous rocks, metamorphic and sedimentary rocks. Hornblende and pyroxene (diopside, hypersthene, enstatite and augite) characterizing the upper Carboniferous Oyabu formation and the Permian formations (Saitaro, Futaiwa, Tanosuji, Uwagawa and Nomura) must have been derived from source rocks (sediments) rich in volcanic products and from ultra-basic-basic igneous rocks and/or from submarine volcanoes, Garnet, the dominant mineral of the Itagatani formation of uncertain age (probably Permo-Triassic), may have been derived from igneous and metamorphic rocks. Authigenic fluorite is commonly associated with the Triassic Uonashi formation. Rounded zircon, tourmaline and garnet are the common minerals of the Jurassic Imaidani formation. This assemblage indicates that the detrital minerals were derived from older sedimentary rocks. Authigenic euhedral and framboidal pyrite, which is the dominant opaque iron ore mineral in limestones, may show that the condition of depositional environment is low in pH and Eh.

• 日本地質学会の論文
• 1971-07-31

著者

• 鹿島 愛彦

  愛媛大学理学部地学教室

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