Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A)
The heavy mineral assemblages of the Lower Pliocene to Quaternary glacial sediments of the CIROS-2 drill site, situated near the mouth of Ferrar Glacier on the McMurdo Sound shelf, Antarctica, were analysed by optical means in order to reconstruct the source areas and dynamics of the late Cenozoic A...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1999
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.55366 https://doi.org/10.1594/PANGAEA.55366 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.55366 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.55366 2023-05-15T14:04:42+02:00 Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) Ehrmann, Werner Polozek, Kerstin LATITUDE: -77.683333 * LONGITUDE: 163.533333 * MINIMUM DEPTH, sediment/rock: 0.01 m * MAXIMUM DEPTH, sediment/rock: 165.64 m 1999-06-10 text/tab-separated-values, 562 data points https://doi.pangaea.de/10.1594/PANGAEA.55366 https://doi.org/10.1594/PANGAEA.55366 en eng PANGAEA Polozek, Kerstin (2001): Die Schwermineralverteilung känozoischer Sedimente des McMurdo-Sunds, Ross-Meer, Antarktis: Rekonstruktion von Liefergebieten und Eisschildfluktuationen. PhD Thesis, Leipzig University, Leipzig, 120 pp, hdl:10013/epic.32120.d001 https://doi.pangaea.de/10.1594/PANGAEA.55366 https://doi.org/10.1594/PANGAEA.55366 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Ehrmann, Werner; Polozek, Kerstin (1999): The heavy mineral record in the Pliocene to Quaternary sediments of the CIROS-2 drill core, McMurdo Sound, Antarctica. Sedimentary Geology, 128(3-4), 223-244, https://doi.org/10.1016/S0037-0738(99)00071-8 Apatite CIROS CIROS-2 Clinopyroxene brown green DEPTH sediment/rock DRILL Drilling/drill rig Epidote Garnet Heavy mineral analysis McMurdo Sound Minerals altered Opaque minerals Palagonite Pyroxene Quartz/standard ratio Sampling/drilling ice Titanaugite Titanite Volcanic glass Zircon Dataset 1999 ftpangaea https://doi.org/10.1594/PANGAEA.55366 https://doi.org/10.1016/S0037-0738(99)00071-8 2023-01-20T07:35:49Z The heavy mineral assemblages of the Lower Pliocene to Quaternary glacial sediments of the CIROS-2 drill site, situated near the mouth of Ferrar Glacier on the McMurdo Sound shelf, Antarctica, were analysed by optical means in order to reconstruct the source areas and dynamics of the late Cenozoic Antarctic ice masses. The assemblages are dominated by pyroxenes, amphiboles, altered minerals and opaque minerals. Within the pyroxene group, clinopyroxenes are most abundant; within the amphibole group, green and brown hornblendes are dominant. Other important heavy minerals present in minor amounts are zircon, titanite, epidote, garnet and apatite. The downcore distribution of the heavy minerals allows a subdivision of the sedimentary sequence into two major units, which can both be further subdivided into two subunits. The Pliocene interval between 166 and 110 mbsf is characterized by relatively high concentrations of apatite, zircon, titanite, garnet, epidote and green hornblende. This assemblage accounts for some 40–60% of the heavy minerals and points to a source to the west of the drill site, in the Transantarctic Mountains, where intrusive, metamorphic and sedimentary rocks cover large areas. The interval 166–137 mbsf (Lower Pliocene) contains additional brown hornblende and palagonite, indicative of a volcanic, probably hyaloclastitic source, which possibly has to be sought beneath the ice of the Ferrar Glacier. In contrast, the uppermost Pliocene and Quaternary interval between 110 mbsf and the top of the core is characterized by high concentrations of clinopyroxenes, altered minerals and opaque minerals. This record points to a main source area in the south or east, where large areas are occupied by basaltic rocks of the McMurdo Volcanic Group. A slight change in the composition of the pyroxene group occurs within this interval, at 48 mbsf. Thus, the heavy minerals in the sediments of core CIROS-2 document different source areas and therewith major changes in the ice dynamics. During the Pliocene the ice ... Dataset Antarc* Antarctic Antarctica Ferrar Glacier McMurdo Sound PANGAEA - Data Publisher for Earth & Environmental Science Antarctic McMurdo Sound Transantarctic Mountains Ferrar Glacier ENVELOPE(163.000,163.000,-77.767,-77.767) ENVELOPE(163.533333,163.533333,-77.683333,-77.683333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Apatite CIROS CIROS-2 Clinopyroxene brown green DEPTH sediment/rock DRILL Drilling/drill rig Epidote Garnet Heavy mineral analysis McMurdo Sound Minerals altered Opaque minerals Palagonite Pyroxene Quartz/standard ratio Sampling/drilling ice Titanaugite Titanite Volcanic glass Zircon |
spellingShingle |
Apatite CIROS CIROS-2 Clinopyroxene brown green DEPTH sediment/rock DRILL Drilling/drill rig Epidote Garnet Heavy mineral analysis McMurdo Sound Minerals altered Opaque minerals Palagonite Pyroxene Quartz/standard ratio Sampling/drilling ice Titanaugite Titanite Volcanic glass Zircon Ehrmann, Werner Polozek, Kerstin Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) |
topic_facet |
Apatite CIROS CIROS-2 Clinopyroxene brown green DEPTH sediment/rock DRILL Drilling/drill rig Epidote Garnet Heavy mineral analysis McMurdo Sound Minerals altered Opaque minerals Palagonite Pyroxene Quartz/standard ratio Sampling/drilling ice Titanaugite Titanite Volcanic glass Zircon |
description |
The heavy mineral assemblages of the Lower Pliocene to Quaternary glacial sediments of the CIROS-2 drill site, situated near the mouth of Ferrar Glacier on the McMurdo Sound shelf, Antarctica, were analysed by optical means in order to reconstruct the source areas and dynamics of the late Cenozoic Antarctic ice masses. The assemblages are dominated by pyroxenes, amphiboles, altered minerals and opaque minerals. Within the pyroxene group, clinopyroxenes are most abundant; within the amphibole group, green and brown hornblendes are dominant. Other important heavy minerals present in minor amounts are zircon, titanite, epidote, garnet and apatite. The downcore distribution of the heavy minerals allows a subdivision of the sedimentary sequence into two major units, which can both be further subdivided into two subunits. The Pliocene interval between 166 and 110 mbsf is characterized by relatively high concentrations of apatite, zircon, titanite, garnet, epidote and green hornblende. This assemblage accounts for some 40–60% of the heavy minerals and points to a source to the west of the drill site, in the Transantarctic Mountains, where intrusive, metamorphic and sedimentary rocks cover large areas. The interval 166–137 mbsf (Lower Pliocene) contains additional brown hornblende and palagonite, indicative of a volcanic, probably hyaloclastitic source, which possibly has to be sought beneath the ice of the Ferrar Glacier. In contrast, the uppermost Pliocene and Quaternary interval between 110 mbsf and the top of the core is characterized by high concentrations of clinopyroxenes, altered minerals and opaque minerals. This record points to a main source area in the south or east, where large areas are occupied by basaltic rocks of the McMurdo Volcanic Group. A slight change in the composition of the pyroxene group occurs within this interval, at 48 mbsf. Thus, the heavy minerals in the sediments of core CIROS-2 document different source areas and therewith major changes in the ice dynamics. During the Pliocene the ice ... |
format |
Dataset |
author |
Ehrmann, Werner Polozek, Kerstin |
author_facet |
Ehrmann, Werner Polozek, Kerstin |
author_sort |
Ehrmann, Werner |
title |
Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) |
title_short |
Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) |
title_full |
Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) |
title_fullStr |
Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) |
title_full_unstemmed |
Relative abundance of heavy minerals in sediment core CIROS-2 from McMurdo Sound, Antarctica (App A) |
title_sort |
relative abundance of heavy minerals in sediment core ciros-2 from mcmurdo sound, antarctica (app a) |
publisher |
PANGAEA |
publishDate |
1999 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.55366 https://doi.org/10.1594/PANGAEA.55366 |
op_coverage |
LATITUDE: -77.683333 * LONGITUDE: 163.533333 * MINIMUM DEPTH, sediment/rock: 0.01 m * MAXIMUM DEPTH, sediment/rock: 165.64 m |
long_lat |
ENVELOPE(163.000,163.000,-77.767,-77.767) ENVELOPE(163.533333,163.533333,-77.683333,-77.683333) |
geographic |
Antarctic McMurdo Sound Transantarctic Mountains Ferrar Glacier |
geographic_facet |
Antarctic McMurdo Sound Transantarctic Mountains Ferrar Glacier |
genre |
Antarc* Antarctic Antarctica Ferrar Glacier McMurdo Sound |
genre_facet |
Antarc* Antarctic Antarctica Ferrar Glacier McMurdo Sound |
op_source |
Supplement to: Ehrmann, Werner; Polozek, Kerstin (1999): The heavy mineral record in the Pliocene to Quaternary sediments of the CIROS-2 drill core, McMurdo Sound, Antarctica. Sedimentary Geology, 128(3-4), 223-244, https://doi.org/10.1016/S0037-0738(99)00071-8 |
op_relation |
Polozek, Kerstin (2001): Die Schwermineralverteilung känozoischer Sedimente des McMurdo-Sunds, Ross-Meer, Antarktis: Rekonstruktion von Liefergebieten und Eisschildfluktuationen. PhD Thesis, Leipzig University, Leipzig, 120 pp, hdl:10013/epic.32120.d001 https://doi.pangaea.de/10.1594/PANGAEA.55366 https://doi.org/10.1594/PANGAEA.55366 |
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.55366 https://doi.org/10.1016/S0037-0738(99)00071-8 |
_version_ |
1766275944682618880 |