Clay and smectite content in sediment core CRP-3
The Cenozoic sediments of the CRP-3 drill core from the continental shelf of McMurdo Sound in Ross Sea, Pacific sector of the Southern Ocean, have been investigated for their clay mineral assemblages, especially for the smectite abundances, concentrations and crystallinities. The assemblages of CRP-...
Main Author: | |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2001
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.57868 https://doi.org/10.1594/PANGAEA.57868 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.57868 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.57868 2023-05-15T14:04:42+02:00 Clay and smectite content in sediment core CRP-3 Ehrmann, Werner LATITUDE: -77.006000 * LONGITUDE: 163.719000 * DATE/TIME START: 1999-10-09T00:00:00 * DATE/TIME END: 1999-11-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 8.97 m * MAXIMUM DEPTH, sediment/rock: 788.94 m 2001-01-23 text/tab-separated-values, 380 data points https://doi.pangaea.de/10.1594/PANGAEA.57868 https://doi.org/10.1594/PANGAEA.57868 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.57868 https://doi.org/10.1594/PANGAEA.57868 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Ehrmann, Werner (2001): Variation in smectite content and crystallinity in sediments from CRP-3, Victoria Land Basin, Antarctica. Terra Antartica, 8(4), 533-542, hdl:10013/epic.28283.d001 Cape Roberts Project Core wireline system CRP CRP-3 CWS DEPTH sediment/rock Grain size sieving/settling tube Ross Sea Sampling/drilling from ice Size fraction < 0.002 mm clay Smectite integral width Smectite/standard ratio X-ray diffraction TEXTUR clay fraction Dataset 2001 ftpangaea https://doi.org/10.1594/PANGAEA.57868 2023-01-20T07:36:16Z The Cenozoic sediments of the CRP-3 drill core from the continental shelf of McMurdo Sound in Ross Sea, Pacific sector of the Southern Ocean, have been investigated for their clay mineral assemblages, especially for the smectite abundances, concentrations and crystallinities. The assemblages of CRP-3 are very different from those of the CRP-1 and CRP-2/2A drill cores. Thus, an almost monomineralic assemblage characterizes the sequence below 330 mbsf. This assemblage is made of well-crystallized smectite with probably authigenic origin between 800 mbsf and 625 mbsf. From 625 mbsf to 330 mbsf the assemblage consists of moderately crystallized smectite that, at least in part, seems to be of detrital origin and thus indicates weathering under a relatively warm and wet climate. In the interval 330-145 mbsf, smectite concentrations fluctuate between 50% and 100% and probably document alternating phases of chemical weathering under a warm and wet climate and physical weathering under a relatively cool and dry climate. Above 145 mbsf the smectite decreases dramatically to concentrations of about 20% and becomes poorly crystalline. In contrast, illite and chlorite become more abundant. Such an assemblage is typical for early Oligocene and younger sediments in McMurdo Sound and reflects physical weathering conditions under a cool climate on a glaciated Antarctic continent. Correlations of the changes in the clay mineral spectrum of CRP-3 with other cores from McMurdo Sound and from other parts of the Southern Ocean has to remain speculative at this stage, because of the poor age control. Dataset Antarc* Antarctic McMurdo Sound Ross Sea Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean Ross Sea McMurdo Sound Pacific Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(163.719000,163.719000,-77.006000,-77.006000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Cape Roberts Project Core wireline system CRP CRP-3 CWS DEPTH sediment/rock Grain size sieving/settling tube Ross Sea Sampling/drilling from ice Size fraction < 0.002 mm clay Smectite integral width Smectite/standard ratio X-ray diffraction TEXTUR clay fraction |
spellingShingle |
Cape Roberts Project Core wireline system CRP CRP-3 CWS DEPTH sediment/rock Grain size sieving/settling tube Ross Sea Sampling/drilling from ice Size fraction < 0.002 mm clay Smectite integral width Smectite/standard ratio X-ray diffraction TEXTUR clay fraction Ehrmann, Werner Clay and smectite content in sediment core CRP-3 |
topic_facet |
Cape Roberts Project Core wireline system CRP CRP-3 CWS DEPTH sediment/rock Grain size sieving/settling tube Ross Sea Sampling/drilling from ice Size fraction < 0.002 mm clay Smectite integral width Smectite/standard ratio X-ray diffraction TEXTUR clay fraction |
description |
The Cenozoic sediments of the CRP-3 drill core from the continental shelf of McMurdo Sound in Ross Sea, Pacific sector of the Southern Ocean, have been investigated for their clay mineral assemblages, especially for the smectite abundances, concentrations and crystallinities. The assemblages of CRP-3 are very different from those of the CRP-1 and CRP-2/2A drill cores. Thus, an almost monomineralic assemblage characterizes the sequence below 330 mbsf. This assemblage is made of well-crystallized smectite with probably authigenic origin between 800 mbsf and 625 mbsf. From 625 mbsf to 330 mbsf the assemblage consists of moderately crystallized smectite that, at least in part, seems to be of detrital origin and thus indicates weathering under a relatively warm and wet climate. In the interval 330-145 mbsf, smectite concentrations fluctuate between 50% and 100% and probably document alternating phases of chemical weathering under a warm and wet climate and physical weathering under a relatively cool and dry climate. Above 145 mbsf the smectite decreases dramatically to concentrations of about 20% and becomes poorly crystalline. In contrast, illite and chlorite become more abundant. Such an assemblage is typical for early Oligocene and younger sediments in McMurdo Sound and reflects physical weathering conditions under a cool climate on a glaciated Antarctic continent. Correlations of the changes in the clay mineral spectrum of CRP-3 with other cores from McMurdo Sound and from other parts of the Southern Ocean has to remain speculative at this stage, because of the poor age control. |
format |
Dataset |
author |
Ehrmann, Werner |
author_facet |
Ehrmann, Werner |
author_sort |
Ehrmann, Werner |
title |
Clay and smectite content in sediment core CRP-3 |
title_short |
Clay and smectite content in sediment core CRP-3 |
title_full |
Clay and smectite content in sediment core CRP-3 |
title_fullStr |
Clay and smectite content in sediment core CRP-3 |
title_full_unstemmed |
Clay and smectite content in sediment core CRP-3 |
title_sort |
clay and smectite content in sediment core crp-3 |
publisher |
PANGAEA |
publishDate |
2001 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.57868 https://doi.org/10.1594/PANGAEA.57868 |
op_coverage |
LATITUDE: -77.006000 * LONGITUDE: 163.719000 * DATE/TIME START: 1999-10-09T00:00:00 * DATE/TIME END: 1999-11-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 8.97 m * MAXIMUM DEPTH, sediment/rock: 788.94 m |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(163.719000,163.719000,-77.006000,-77.006000) |
geographic |
Antarctic Southern Ocean Ross Sea McMurdo Sound Pacific Cape Roberts |
geographic_facet |
Antarctic Southern Ocean Ross Sea McMurdo Sound Pacific Cape Roberts |
genre |
Antarc* Antarctic McMurdo Sound Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic McMurdo Sound Ross Sea Southern Ocean |
op_source |
Supplement to: Ehrmann, Werner (2001): Variation in smectite content and crystallinity in sediments from CRP-3, Victoria Land Basin, Antarctica. Terra Antartica, 8(4), 533-542, hdl:10013/epic.28283.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.57868 https://doi.org/10.1594/PANGAEA.57868 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.57868 |
_version_ |
1766275950181351424 |