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Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin

หน่วยงาน National Institute Of Oceanography (NIO), India

รายละเอียด

ชื่อเรื่อง : Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin
นักวิจัย : Kalangutkar, N.G. , Iyer, S.D. , Ilangovan, D.
คำค้น : pumice , petrology , physical properties , morphometry
หน่วยงาน : National Institute Of Oceanography (NIO), India
ผู้ร่วมงาน : -
ปีพิมพ์ : 2554
อ้างอิง : Acta Geologica Sinica, vol.85; 2011; 826-839 , http://drs.nio.org/drs/handle/2264/3923
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

About 400 pumice clasts collected from the Central Indian Ocean Basin (CIOB) were studied for their morphology and classified based on their shape and size. A majority of the samples range between less than 1 cm and 36 cm and in the Zinggs shape diagram plot in the equant and oblate fields. The 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 varied from 0.21 to 0.74 g/cm sup(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 fibrous. Petrography 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 uncommon. Todorokite is commonly present in the ferromanganese oxide coating present over some of the pumices. The controversial origin of the pumices and glass shards in the CIOB is also discussed.

บรรณานุกรม :
Kalangutkar, N.G. , Iyer, S.D. , Ilangovan, D. . (2554). Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin.
    : National Institute Of Oceanography (NIO), India.
Kalangutkar, N.G. , Iyer, S.D. , Ilangovan, D. . 2554. "Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin".
    : National Institute Of Oceanography (NIO), India.
Kalangutkar, N.G. , Iyer, S.D. , Ilangovan, D. . "Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin."
    : National Institute Of Oceanography (NIO), India, 2554. Print.
Kalangutkar, N.G. , Iyer, S.D. , Ilangovan, D. . Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin. : National Institute Of Oceanography (NIO), India; 2554.