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タイトル: Diagenesis in Early Miocene Waitemata Group sediments, Upper Waitemata Harbour, Auckland, New Zealand(MEMORIAL VOLUME TO THE LATE PROFESSOR TERUHIKO SAMESHIMA)
著者: Davidson, Kevin J.
Black, Philippa M.
掲載誌名: Geoscience reports of Shizuoka University
出版者: Shizuoka University. Institute of Geosciences
巻: 20
開始ページ: 135
終了ページ: 142
出版日付: 1994-03
NDC: 458
抄録: The Waitemata Group in the Upper Waitemata Harbour area is a turbidite sequence with interbedded volcaniclastic sandstones, rhyolitic granule-sand and tuff horizons, and conglomerate lenses containing metamorphic, volcanic, plutonic and sedimentary clasts. Clastic debris in the sediments is little altered except for devitrification of volcanic glass. Zeolites and clay minerals encrust clastic grains and fill pores. There is a strong lithologic control on diagenetic assemblages. Lithic-rich sandstones poor in volcanic debris have calcite cement. Volcaniclastic sandstones have zeolite cement with the paragenetic sequence clinoptilolite ( + mordenite) → chabazite and/or erionite, and finally rare analcime. Rhyolitic granule-sand horizons contain the paragenetic sequence analcime → clinoptilolite → chabazite and/or erionite. Conglomerate horizons, which frequently lack any vitric debris, have analcime cement. In rhyolitic tuff only mordenite occurs crystallising directly from devitrified glass shards. Clay minerals present are smectite and illite, and chlorite in highly altered volcaniclastic sediments. Interbedded mudstones sealed fluids into volcaniclastic sandstone and tuff horizons and diagenesis occurred in a closed hydrologic system. The original pore fluid, believed bicarbonate-rich, precipitated calcite cement in the absence of vitric debris. In volcaniclastic and vitric rocks devitrification of glass liberated alkalies and silica into pore fluids leading to crystallisation of zeolite. Conglomerates filling channels cut into other sediments were an open hydrologic system and analcime crystallised from Na-saturated fluids flowing through them.
ISSN: 03886298 OPAC
NII論文ID: 110000413352 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:1993 20

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