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Palaeogene hardgrounds and associated intraclast lag deposits as the substrates of ferromanganese crusts and nuclei of nodules: Inferences of abyssal current in the Central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Palaeogene hardgrounds and associated intraclast lag deposits as the substrates of ferromanganese crusts and nuclei of nodules: Inferences of abyssal current in the Central Indian Ocean Basin
 
Creator Gupta, S.M.
 
Subject ferromanganese nodules
concretions
substrata
nuclei
palaeoenvironments
abyssal currents
palaeogene
 
Description The Palaeogene substrates of ferromanganese crusts and nuclei of nodules collected from the Central Indian Basin chiefly consist of incipient to younger pelagic hard grounds and associated intraclast lag deposits. The clayey lumps, ferromanganese micronodules, crystalline aggregates of phillipsite, relic volcanic glass shards, and ichthyoliths (the phosphatic micro-remains of fishes) constitute the coarse fractions of these hard substrates and the nuclei. Alteration of volcanic material into palagonite and its later diagenesis led to the synsedimentary lithification of pelagic zeolitic clays into the hardgrounds. The pre-lithification burrows and post-lithification borings in these clayclast nuclei and substrates are also reported. Trypanites type borings and Thalassinoides and Chondrites type burrows are either filled with ferromanganese oxide or with younger sediment infillings suggesting an omission-suite of a synsedimentary lithified hardground. Hummocky-relief over the hardgrounds and associated intraclast lag deposits are the result of scouring and exhuming by an abyssal current, probably the Antarctic Bottom Water Current, in the basin. The palaeoenvironment and sequence of events of accretion of nodules and crusts are discussed.
 
Date 2009-01-25T05:57:35Z
2009-01-25T05:57:35Z
1995
 
Type Journal Article
 
Identifier Journal of Palaeontological Society of India, Vol.40; 77-86p.
http://drs.nio.org/drs/handle/2264/2339
 
Language en
 
Rights Copyright [1995]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Palaeontological Society of India