Physical Properties,Morphology and Petrological Characteristics of Pumices from the Central Indian Ocean Basin

作     者：Niyati G.KALANGUTKAR Sridhar D.IYER Dandaydayudapani ILANGOVAN 

作者机构：National Institute of Oceanography(Council of Scientific and Industrial Research)Dona PaulaGoa 403 004India 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2011年第85卷第4期

页      面：826-839页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：the financial assistance provided under the CSIR(New Delhi) Fellowship scheme 

主　　题：pumice physical properties submarine Central Indian Ocean Basin 

摘      要：About 400 pumice clasts collected from the Central Indian Ocean Basin（CIOB）were studied for their morphology and were classified based on their shape and size.A majority of the samples range between1 cm and 36 cm and in the Zinggs shape diagram plot in the equant and oblate *** Corey Shape Factor for most of the samples is close to 0.7,which is common for volcaniclastic material. The physical properties such as density,specific gravity,void ratio,porosity,moisture content and degree of saturation,were determined for 30 pumice *** varies from 0.21 to 0.74 g/cm^3 specific gravity 1.84 to 3.27,void ratio 2.21 to 10.67,porosity 67%to 91%,moisture content during sinking 0.44 to 2.35 and degree of saturation varies from 26.5%to 86%.Binocular and electron microscopy studies reveal that 60%of the vesicles are elongated,30%are spherical and 10%are *** of the pumices exhibits vitrophyric texture with phenocrysts of feldspars and clinopyroxenes.X-ray diffractrogram and mineral analyses confirm plagioclase to be a major phase, while quartz and orthoclase are not *** is commonly present in the ferromanganese oxide coating present over some of the *** paper also delves into some details concerning the controversial origin of the pumices and glass shards in the CIOB.