Sedimentology and stratigraphy of the AND-2A core, ANDRILL Southern McMurdo Sound Project, Antarctica

the ANDRILL-SMS Science Team

Research output: Contribution to journalArticleResearchpeer-review

27 Citations (Scopus)

Abstract

During the 2007 - 2008 austral spring season, the ANDRILL Southern McMurdo Sound Project recovered a core 1138 metres long (AND-2A) from a location in the southern McMurdo Sound near the Dailey Islands. This core contains a range of lithologies, including various types of terrigenous clastic diamictite, conglomerate and breccia, sandstone and mudrocks, volcanic lava, pyroclastic and reworked volcanic sedimentary rocks, and diatomite. The succession is divided into fourteen lithostratigraphic units (LSUs), two of which (LSUs 1 and 8) are further subdivided into three and four sub-units, respectively, based on changes in abundance of lithologies. Thirteen lithofacies are recognized, ranging from diatomite and bioturbated, fossil-bearing mudrocks (representing most ice-distal environments) through interlaminated sandstone-mudrock faciès and sandstone with varying dispersed gravel components, to diamictite and conglomerate (representing most ice-proximal environments), and also lava, volcanic breccia and volcanic sedimentary rocks representing extrusion, fragmentation, fallout and reworking of material from basaltic volcanic activity. Three distinct types Cmotifs') of vertical fades stacking patterns are recognized, recording glacial advance-retreat-advance cycles with varying degrees of faciès preservation. Carbonate, pyrite and zeolites are the principal secondary mineral phases in the core. The pyrite overprint is particularly prominent in the lower half of the core, where it typically obscures stratification and sediment texture. Studies of modern aeolian sediment deposition onto McMurdo Sound sea-ice reveal that between 7600 and 24 000 kg km2 of terrigenous clastic material is being stored on the sea-ice in this region.

Original languageEnglish
Pages (from-to)77-112
Number of pages36
JournalTerra Antartica
Volume15
Issue number1-2
StatePublished - 1 Jan 2008

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stratigraphy
sedimentology
Antarctica
mudstone
Ice Cover
diamictite
lava
diatomite
sandstone
ice
Ice
volcanic rocks
breccia
sedimentary rocks
diatomaceous earth
conglomerate
sea ice
sedimentary rock
pyrite
volcanic rock

Cite this

@article{abaa62cf4f1a45738d1079d099cdeb76,
title = "Sedimentology and stratigraphy of the AND-2A core, ANDRILL Southern McMurdo Sound Project, Antarctica",
abstract = "During the 2007 - 2008 austral spring season, the ANDRILL Southern McMurdo Sound Project recovered a core 1138 metres long (AND-2A) from a location in the southern McMurdo Sound near the Dailey Islands. This core contains a range of lithologies, including various types of terrigenous clastic diamictite, conglomerate and breccia, sandstone and mudrocks, volcanic lava, pyroclastic and reworked volcanic sedimentary rocks, and diatomite. The succession is divided into fourteen lithostratigraphic units (LSUs), two of which (LSUs 1 and 8) are further subdivided into three and four sub-units, respectively, based on changes in abundance of lithologies. Thirteen lithofacies are recognized, ranging from diatomite and bioturbated, fossil-bearing mudrocks (representing most ice-distal environments) through interlaminated sandstone-mudrock faci{\`e}s and sandstone with varying dispersed gravel components, to diamictite and conglomerate (representing most ice-proximal environments), and also lava, volcanic breccia and volcanic sedimentary rocks representing extrusion, fragmentation, fallout and reworking of material from basaltic volcanic activity. Three distinct types Cmotifs') of vertical fades stacking patterns are recognized, recording glacial advance-retreat-advance cycles with varying degrees of faci{\`e}s preservation. Carbonate, pyrite and zeolites are the principal secondary mineral phases in the core. The pyrite overprint is particularly prominent in the lower half of the core, where it typically obscures stratification and sediment texture. Studies of modern aeolian sediment deposition onto McMurdo Sound sea-ice reveal that between 7600 and 24 000 kg km2 of terrigenous clastic material is being stored on the sea-ice in this region.",
author = "{the ANDRILL-SMS Science Team} and Fielding, {Christopher R.} and Atkins, {C. B.} and Bassett, {K. N.} and Browne, {G. H.} and Dunbar, {G. B.} and Field, {B. D.} and Frank, {Tracy Dagmar} and Krissek, {L. A.} and Panter, {K. S.} and Sandra Passchier and Pekar, {S. F.} and S. Sandroni and F. Talarico",
year = "2008",
month = "1",
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language = "English",
volume = "15",
pages = "77--112",
journal = "Terra Antarctica",
issn = "1122-8628",
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number = "1-2",

}

Sedimentology and stratigraphy of the AND-2A core, ANDRILL Southern McMurdo Sound Project, Antarctica. / the ANDRILL-SMS Science Team.

In: Terra Antartica, Vol. 15, No. 1-2, 01.01.2008, p. 77-112.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

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AU - the ANDRILL-SMS Science Team

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AU - Browne, G. H.

AU - Dunbar, G. B.

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AU - Talarico, F.

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N2 - During the 2007 - 2008 austral spring season, the ANDRILL Southern McMurdo Sound Project recovered a core 1138 metres long (AND-2A) from a location in the southern McMurdo Sound near the Dailey Islands. This core contains a range of lithologies, including various types of terrigenous clastic diamictite, conglomerate and breccia, sandstone and mudrocks, volcanic lava, pyroclastic and reworked volcanic sedimentary rocks, and diatomite. The succession is divided into fourteen lithostratigraphic units (LSUs), two of which (LSUs 1 and 8) are further subdivided into three and four sub-units, respectively, based on changes in abundance of lithologies. Thirteen lithofacies are recognized, ranging from diatomite and bioturbated, fossil-bearing mudrocks (representing most ice-distal environments) through interlaminated sandstone-mudrock faciès and sandstone with varying dispersed gravel components, to diamictite and conglomerate (representing most ice-proximal environments), and also lava, volcanic breccia and volcanic sedimentary rocks representing extrusion, fragmentation, fallout and reworking of material from basaltic volcanic activity. Three distinct types Cmotifs') of vertical fades stacking patterns are recognized, recording glacial advance-retreat-advance cycles with varying degrees of faciès preservation. Carbonate, pyrite and zeolites are the principal secondary mineral phases in the core. The pyrite overprint is particularly prominent in the lower half of the core, where it typically obscures stratification and sediment texture. Studies of modern aeolian sediment deposition onto McMurdo Sound sea-ice reveal that between 7600 and 24 000 kg km2 of terrigenous clastic material is being stored on the sea-ice in this region.

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