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Geochemical Study of Java Flows , Ejecta and Pyroclastic Flows from the Krakatau Grup, Indonesia

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Geochemical and lithological studies of volcanic rocks, decta and pyroclastic flows, those of which were collected from Phenocrystic minerals from the Krakatau Group, were carried out. The volcanic rocks were also investigated by the electron-probe Thermally altered products and related minerals, icroanalyzer. And pyroclastic flow and pumice were examined by X-ray powder iffraction method and the scanning electron microscope.

Rocks and ejecta of Anak Krakatau apparently represent almost the same characteristic features not only lithologically but also reochemically, common to basaltic andesites of typical volcanoes. It is noted that a new volcanic ash has some of island arcs. conspicuous difference; the ash is more basic in chemical compo- sition than others.

Volcanic rocks from Rakata can lithologically be distinguished into three rock types; augite-hypersthene andesite with hyalo- pilitic texture of lava flow and augite andesite with inter- granular texture of lava flow, and olivine basalt with inter- It became clear that the rock having sertal texture of dike. been called tridymite rhyolite is augite-hypersthene andesite with cavities filled with tridymite, which was identified by X-ray powder diffraction analysis.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

PVG A.83-86

Penerbit

Bandung, Jawa Barat, Indonesia : Pusat Vulkanologi dan Mitigasi Bencana Geologi., 1983

Deskripsi Fisik

44 hlm; gmbr; tabel; peta

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

lava flows
Pyroclastic
Gunung Krakatau

Info Detail Spesifik

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Pernyataan Tanggungjawab

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Informasi Lainnya

Kode Wilayah

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Pulau Dan Lembar Peta

Sumatera

Provinsi

Kepulauan Riau

Koordinat - Latitude

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Koordinat - Longitude

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Versi lain/terkait

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