A young porcellanite occurrence from the Southwest Indian Ridge.

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Bohrmann, Gerhard, Kuhn, Gerhard, Abelmann, Andrea, Gersonde, Rainer and Fütterer, Dieter (1990) A young porcellanite occurrence from the Southwest Indian Ridge. Marine Geology, 92 (1-2). pp. 155-163. DOI 10.1016/0025-3227(90)90034-H.

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Abstract

A porcellanite layer, probably younger than 0.6-0.4 Ma, of a nearly monomineralic composition of opal-CT was sampled on the Southwest Indian Ridge during Polarstern cruise ANT-VI/3. The intense cementation of the rock, together with recent findings by the Ocean Drilling Program (Legs 113 and 120) and the occurrence of a unique older porcellanite from Eltanin Core 47-15, provides evidence of very early silica precipitation in pure diatom oozes of the Southern Ocean. Such porcellanites occur in shallowly buried young sediments and provide a contrast to the established concepts of porcellanite formation.

Document Type: Article
Keywords: RV Polarstern, ANT-VI/3, Southwest Indian Ridge, porcellanite layer
Refereed: Yes
Open Access Journal?: Yes
Publisher: Elsevier
Projects: Enrichment
Date Deposited: 15 Feb 2016 09:22
Last Modified: 15 Feb 2016 09:22
URI: https://oceanrep.geomar.de/id/eprint/31342

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