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Some Charecteristics of Brown Soils on Rakata islands developed in material Originating prior to the 1883 Krakatau Eruption

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Four pedons of Brown Soils originating from material prior to the 1883 Krakatau eruption have been identified in Rakata, exposed or buried under the thick layer of pumiceous anh. Three of those pedons have been studied in terms of their physico-chemiopl proper ties, cand and clay mineralogy.

The results indicate that the Brown Soils have been developed from basalto-andesitic volcanic motorial, probably ash. The old volcanic ic ash where the soils had developed originated oither from the periode of Rakata volcano formation (stage II of Escher, 1948) or from the formation period of the Porbuwaten and Danan volcanoes (stage IIIA of Escher, 1948).

In compore with the young p pumiceous soils of Rakota, which shows a hypersthence sugite andonitic choroctor, the Brown Soils are in more advanced atago of weathering. Soils are coarne loomy, more total clay, free iron and organic corbon. Buried podon shows noutrel reaction and high base status, posibly due to acceptance of beses lesched down from the overlying pumiceous ash. The oxposed pedons are more acid, less bases and showing evidence the domina- tion of amorphous material in their exchange complex.

or Eutric The buried pedon is classified as Typic Eutropepts or Cambisols. The exposed pedons are Entic Dystrandepts or Ochric Ando sols end or (Andeptic) Dystropepts or Dystric Cambisols respective- ly. According to the Guy Smith's proposal for Andisol (1978), these soils classified as Hoplotropand and Entic Haplotropends.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

PVG A.83-47

Penerbit

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

Deskripsi Fisik

19 hlm; tabel

Bahasa

English

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

1883
Gunung Krakatu
Rakata Island

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

Lampiran Berkas