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
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,...
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Palaeontological Society of India
1995
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ftnio:oai:dsr.nio.org:2264/2339 2023-05-15T13:59:28+02:00 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 Gupta, S.M. 1995 http://drs.nio.org/drs/handle/2264/2339 en eng Palaeontological Society of India 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. ferromanganese nodules concretions substrata nuclei palaeoenvironments abyssal currents palaeogene Journal Article 1995 ftnio 2012-08-25T20:07:10Z 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. Article in Journal/Newspaper Antarc* Antarctic National Institute of Oceanography, India: Digital Repository Service (DRS@nio) Antarctic The Antarctic Indian Burrows ENVELOPE(163.650,163.650,-74.300,-74.300) |
institution |
Open Polar |
collection |
National Institute of Oceanography, India: Digital Repository Service (DRS@nio) |
op_collection_id |
ftnio |
language |
English |
topic |
ferromanganese nodules concretions substrata nuclei palaeoenvironments abyssal currents palaeogene |
spellingShingle |
ferromanganese nodules concretions substrata nuclei palaeoenvironments abyssal currents palaeogene Gupta, S.M. 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 |
topic_facet |
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. |
format |
Article in Journal/Newspaper |
author |
Gupta, S.M. |
author_facet |
Gupta, S.M. |
author_sort |
Gupta, S.M. |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publisher |
Palaeontological Society of India |
publishDate |
1995 |
url |
http://drs.nio.org/drs/handle/2264/2339 |
long_lat |
ENVELOPE(163.650,163.650,-74.300,-74.300) |
geographic |
Antarctic The Antarctic Indian Burrows |
geographic_facet |
Antarctic The Antarctic Indian Burrows |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_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. |
_version_ |
1766268026114539520 |