Miocene Strata in CRP-1, Cape Roberts Project, Antarctica

Cape Robert, J. Anderson, P. Armienti, C. Atkins, P. Barrett, S. Bohaty, S. Bryce, M. Claps, M. Curran, F. J. Davey, L. De Santis, W. Ehrmann, F. Florindo, C. Fielding, M. Hambrey, M. Hannah, D. M. Harwood, S. Henrys, F. Hoelscher, J. A. HoweR. Jarrard, R. Kettler, S. Kooyman, C. Kopsch, L. Krissek, M. Lavelle, E. Levac, F. Niessen, Sandra Passchier, T. Paulsen, R. Powell, A. Pyne, G. Rafat, I. J. Raine, A. P. Roberts, L. Sagnotti, S. Sandroni, E. Scholz, J. Simes, J. Smellie, P. Strong, M. Tabecki, F. M. Talarico, M. Taviani, K. L. Verosub, G. Villa, P. N. Webb, G. S. Wilson, T. Wilson, S. W. Wise, T. Wonik, K. Woolfe, J. H. Wrenn

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Based on the alternation of diamicts with other clastic sedimentary facies, the predominantly lithified Miocene section of CRP-1 has been divided into lithostratigraphic Units 5 to 7, with Unit 5 further divided into 8 subunits and Unit 6 into 3. Petrological investigations of extraformational clasts indicate provenance from probable Cambro-Ordovician granites, metamorphic rocks (Koettlitz Group?), Ferrar dolerite and rhyolites of uncertain affinity. The sand fraction is dominated by grains derived from crystalline basement and the Beacon Supergroup, but volcanic glass, abundant above 62 mbsf, is correlated with the McMurdo Volcanic Group. X-ray diffraction analysis of mud samples shows a similar change in mineralogy over the interval 60-65 mbsf from smectite-dominated above to illite and chlorite-dominated below. The Miocene section is dated by diatom biostratigraphy at 17.5-22.4 Ma (early Miocene), which suggests an average sediment accumulation rate of about 21 m/my. The most prevalent fossil groups are diatoms, foraminifers and palynomorphs. The well-preserved marine palynomorph assemblage contains many new acritarchs, and apparently represents the first known palynomorph record from in situ lower-Miocene Antarctic sediments. Calcareous nannofossils (Thoracosphaera) are rare to few, as are macrofossils (serpulid worm tubes, echinoid spines, bryozoans, and scallop shells). Palaeoenvironmental interpretations suggest a glacimarine setting warmer than present that underwent some significant fluctuations in water depth and proximity to the ice margin. A magnetic-polarity stratigraphy has been measured for the lower c. 90 m. Four magnetozones defined below 89 mbsf are correlated within the range of Chrons C5Dr to C6 of the Magnetic Polarity Time Scale. The Miocene section has also been divided into six recurrent lithofacies: diamictite, rhythmically interlaminated finegrained sandstone and siltstone, well-stratified sandstone, poorly-stratified muddy sandstone, coarse-grained siltstone and fine-grained siltstone. No major changes in facies assemblage have been identified, implying similar variations in environmental conditions throughout. Last, the succession has been divided by sequence stratigraphic analysis into 10 units, wherein each sequence passes upward from a basal diamict into progressively finer-grained facies, interpreted as a flooding event. Each sequence is thought to record the cyclical advance and retreat of grounded ice across the site, although there is little or no record of glacial advance. The only positive evidence for sediment accumulation under grounded ice has been found in a directional clast fabric in a diamictite at 62.64 mbsf.

Original languageEnglish
Pages (from-to)63-124
Number of pages62
JournalTerra Antarctica
Volume5
Issue number1
StatePublished - 1 Dec 1998

Fingerprint

Ice
sandstone
Antarctica
Diatoms
ice
Bacillariophyceae
Miocene
sediments
siltstone
diamictite
palynomorph
Foraminifera
tube worms
Pectinidae
sand fraction
metamorphic rocks
chlorite (mineral)
microfossils
shell (molluscs)
illite

Cite this

Robert, C., Anderson, J., Armienti, P., Atkins, C., Barrett, P., Bohaty, S., ... Wrenn, J. H. (1998). Miocene Strata in CRP-1, Cape Roberts Project, Antarctica. Terra Antarctica, 5(1), 63-124.
Robert, Cape ; Anderson, J. ; Armienti, P. ; Atkins, C. ; Barrett, P. ; Bohaty, S. ; Bryce, S. ; Claps, M. ; Curran, M. ; Davey, F. J. ; De Santis, L. ; Ehrmann, W. ; Florindo, F. ; Fielding, C. ; Hambrey, M. ; Hannah, M. ; Harwood, D. M. ; Henrys, S. ; Hoelscher, F. ; Howe, J. A. ; Jarrard, R. ; Kettler, R. ; Kooyman, S. ; Kopsch, C. ; Krissek, L. ; Lavelle, M. ; Levac, E. ; Niessen, F. ; Passchier, Sandra ; Paulsen, T. ; Powell, R. ; Pyne, A. ; Rafat, G. ; Raine, I. J. ; Roberts, A. P. ; Sagnotti, L. ; Sandroni, S. ; Scholz, E. ; Simes, J. ; Smellie, J. ; Strong, P. ; Tabecki, M. ; Talarico, F. M. ; Taviani, M. ; Verosub, K. L. ; Villa, G. ; Webb, P. N. ; Wilson, G. S. ; Wilson, T. ; Wise, S. W. ; Wonik, T. ; Woolfe, K. ; Wrenn, J. H. / Miocene Strata in CRP-1, Cape Roberts Project, Antarctica. In: Terra Antarctica. 1998 ; Vol. 5, No. 1. pp. 63-124.
@article{26c5215e01764b59954b8e10709c2592,
title = "Miocene Strata in CRP-1, Cape Roberts Project, Antarctica",
abstract = "Based on the alternation of diamicts with other clastic sedimentary facies, the predominantly lithified Miocene section of CRP-1 has been divided into lithostratigraphic Units 5 to 7, with Unit 5 further divided into 8 subunits and Unit 6 into 3. Petrological investigations of extraformational clasts indicate provenance from probable Cambro-Ordovician granites, metamorphic rocks (Koettlitz Group?), Ferrar dolerite and rhyolites of uncertain affinity. The sand fraction is dominated by grains derived from crystalline basement and the Beacon Supergroup, but volcanic glass, abundant above 62 mbsf, is correlated with the McMurdo Volcanic Group. X-ray diffraction analysis of mud samples shows a similar change in mineralogy over the interval 60-65 mbsf from smectite-dominated above to illite and chlorite-dominated below. The Miocene section is dated by diatom biostratigraphy at 17.5-22.4 Ma (early Miocene), which suggests an average sediment accumulation rate of about 21 m/my. The most prevalent fossil groups are diatoms, foraminifers and palynomorphs. The well-preserved marine palynomorph assemblage contains many new acritarchs, and apparently represents the first known palynomorph record from in situ lower-Miocene Antarctic sediments. Calcareous nannofossils (Thoracosphaera) are rare to few, as are macrofossils (serpulid worm tubes, echinoid spines, bryozoans, and scallop shells). Palaeoenvironmental interpretations suggest a glacimarine setting warmer than present that underwent some significant fluctuations in water depth and proximity to the ice margin. A magnetic-polarity stratigraphy has been measured for the lower c. 90 m. Four magnetozones defined below 89 mbsf are correlated within the range of Chrons C5Dr to C6 of the Magnetic Polarity Time Scale. The Miocene section has also been divided into six recurrent lithofacies: diamictite, rhythmically interlaminated finegrained sandstone and siltstone, well-stratified sandstone, poorly-stratified muddy sandstone, coarse-grained siltstone and fine-grained siltstone. No major changes in facies assemblage have been identified, implying similar variations in environmental conditions throughout. Last, the succession has been divided by sequence stratigraphic analysis into 10 units, wherein each sequence passes upward from a basal diamict into progressively finer-grained facies, interpreted as a flooding event. Each sequence is thought to record the cyclical advance and retreat of grounded ice across the site, although there is little or no record of glacial advance. The only positive evidence for sediment accumulation under grounded ice has been found in a directional clast fabric in a diamictite at 62.64 mbsf.",
author = "Cape Robert and J. Anderson and P. Armienti and C. Atkins and P. Barrett and S. Bohaty and S. Bryce and M. Claps and M. Curran and Davey, {F. J.} and {De Santis}, L. and W. Ehrmann and F. Florindo and C. Fielding and M. Hambrey and M. Hannah and Harwood, {D. M.} and S. Henrys and F. Hoelscher and Howe, {J. A.} and R. Jarrard and R. Kettler and S. Kooyman and C. Kopsch and L. Krissek and M. Lavelle and E. Levac and F. Niessen and Sandra Passchier and T. Paulsen and R. Powell and A. Pyne and G. Rafat and Raine, {I. J.} and Roberts, {A. P.} and L. Sagnotti and S. Sandroni and E. Scholz and J. Simes and J. Smellie and P. Strong and M. Tabecki and Talarico, {F. M.} and M. Taviani and Verosub, {K. L.} and G. Villa and Webb, {P. N.} and Wilson, {G. S.} and T. Wilson and Wise, {S. W.} and T. Wonik and K. Woolfe and Wrenn, {J. H.}",
year = "1998",
month = "12",
day = "1",
language = "English",
volume = "5",
pages = "63--124",
journal = "Terra Antarctica",
issn = "1122-8628",
publisher = "Terra Antarctica Publication",
number = "1",

}

Robert, C, Anderson, J, Armienti, P, Atkins, C, Barrett, P, Bohaty, S, Bryce, S, Claps, M, Curran, M, Davey, FJ, De Santis, L, Ehrmann, W, Florindo, F, Fielding, C, Hambrey, M, Hannah, M, Harwood, DM, Henrys, S, Hoelscher, F, Howe, JA, Jarrard, R, Kettler, R, Kooyman, S, Kopsch, C, Krissek, L, Lavelle, M, Levac, E, Niessen, F, Passchier, S, Paulsen, T, Powell, R, Pyne, A, Rafat, G, Raine, IJ, Roberts, AP, Sagnotti, L, Sandroni, S, Scholz, E, Simes, J, Smellie, J, Strong, P, Tabecki, M, Talarico, FM, Taviani, M, Verosub, KL, Villa, G, Webb, PN, Wilson, GS, Wilson, T, Wise, SW, Wonik, T, Woolfe, K & Wrenn, JH 1998, 'Miocene Strata in CRP-1, Cape Roberts Project, Antarctica', Terra Antarctica, vol. 5, no. 1, pp. 63-124.

Miocene Strata in CRP-1, Cape Roberts Project, Antarctica. / Robert, Cape; Anderson, J.; Armienti, P.; Atkins, C.; Barrett, P.; Bohaty, S.; Bryce, S.; Claps, M.; Curran, M.; Davey, F. J.; De Santis, L.; Ehrmann, W.; Florindo, F.; Fielding, C.; Hambrey, M.; Hannah, M.; Harwood, D. M.; Henrys, S.; Hoelscher, F.; Howe, J. A.; Jarrard, R.; Kettler, R.; Kooyman, S.; Kopsch, C.; Krissek, L.; Lavelle, M.; Levac, E.; Niessen, F.; Passchier, Sandra; Paulsen, T.; Powell, R.; Pyne, A.; Rafat, G.; Raine, I. J.; Roberts, A. P.; Sagnotti, L.; Sandroni, S.; Scholz, E.; Simes, J.; Smellie, J.; Strong, P.; Tabecki, M.; Talarico, F. M.; Taviani, M.; Verosub, K. L.; Villa, G.; Webb, P. N.; Wilson, G. S.; Wilson, T.; Wise, S. W.; Wonik, T.; Woolfe, K.; Wrenn, J. H.

In: Terra Antarctica, Vol. 5, No. 1, 01.12.1998, p. 63-124.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Miocene Strata in CRP-1, Cape Roberts Project, Antarctica

AU - Robert, Cape

AU - Anderson, J.

AU - Armienti, P.

AU - Atkins, C.

AU - Barrett, P.

AU - Bohaty, S.

AU - Bryce, S.

AU - Claps, M.

AU - Curran, M.

AU - Davey, F. J.

AU - De Santis, L.

AU - Ehrmann, W.

AU - Florindo, F.

AU - Fielding, C.

AU - Hambrey, M.

AU - Hannah, M.

AU - Harwood, D. M.

AU - Henrys, S.

AU - Hoelscher, F.

AU - Howe, J. A.

AU - Jarrard, R.

AU - Kettler, R.

AU - Kooyman, S.

AU - Kopsch, C.

AU - Krissek, L.

AU - Lavelle, M.

AU - Levac, E.

AU - Niessen, F.

AU - Passchier, Sandra

AU - Paulsen, T.

AU - Powell, R.

AU - Pyne, A.

AU - Rafat, G.

AU - Raine, I. J.

AU - Roberts, A. P.

AU - Sagnotti, L.

AU - Sandroni, S.

AU - Scholz, E.

AU - Simes, J.

AU - Smellie, J.

AU - Strong, P.

AU - Tabecki, M.

AU - Talarico, F. M.

AU - Taviani, M.

AU - Verosub, K. L.

AU - Villa, G.

AU - Webb, P. N.

AU - Wilson, G. S.

AU - Wilson, T.

AU - Wise, S. W.

AU - Wonik, T.

AU - Woolfe, K.

AU - Wrenn, J. H.

PY - 1998/12/1

Y1 - 1998/12/1

N2 - Based on the alternation of diamicts with other clastic sedimentary facies, the predominantly lithified Miocene section of CRP-1 has been divided into lithostratigraphic Units 5 to 7, with Unit 5 further divided into 8 subunits and Unit 6 into 3. Petrological investigations of extraformational clasts indicate provenance from probable Cambro-Ordovician granites, metamorphic rocks (Koettlitz Group?), Ferrar dolerite and rhyolites of uncertain affinity. The sand fraction is dominated by grains derived from crystalline basement and the Beacon Supergroup, but volcanic glass, abundant above 62 mbsf, is correlated with the McMurdo Volcanic Group. X-ray diffraction analysis of mud samples shows a similar change in mineralogy over the interval 60-65 mbsf from smectite-dominated above to illite and chlorite-dominated below. The Miocene section is dated by diatom biostratigraphy at 17.5-22.4 Ma (early Miocene), which suggests an average sediment accumulation rate of about 21 m/my. The most prevalent fossil groups are diatoms, foraminifers and palynomorphs. The well-preserved marine palynomorph assemblage contains many new acritarchs, and apparently represents the first known palynomorph record from in situ lower-Miocene Antarctic sediments. Calcareous nannofossils (Thoracosphaera) are rare to few, as are macrofossils (serpulid worm tubes, echinoid spines, bryozoans, and scallop shells). Palaeoenvironmental interpretations suggest a glacimarine setting warmer than present that underwent some significant fluctuations in water depth and proximity to the ice margin. A magnetic-polarity stratigraphy has been measured for the lower c. 90 m. Four magnetozones defined below 89 mbsf are correlated within the range of Chrons C5Dr to C6 of the Magnetic Polarity Time Scale. The Miocene section has also been divided into six recurrent lithofacies: diamictite, rhythmically interlaminated finegrained sandstone and siltstone, well-stratified sandstone, poorly-stratified muddy sandstone, coarse-grained siltstone and fine-grained siltstone. No major changes in facies assemblage have been identified, implying similar variations in environmental conditions throughout. Last, the succession has been divided by sequence stratigraphic analysis into 10 units, wherein each sequence passes upward from a basal diamict into progressively finer-grained facies, interpreted as a flooding event. Each sequence is thought to record the cyclical advance and retreat of grounded ice across the site, although there is little or no record of glacial advance. The only positive evidence for sediment accumulation under grounded ice has been found in a directional clast fabric in a diamictite at 62.64 mbsf.

AB - Based on the alternation of diamicts with other clastic sedimentary facies, the predominantly lithified Miocene section of CRP-1 has been divided into lithostratigraphic Units 5 to 7, with Unit 5 further divided into 8 subunits and Unit 6 into 3. Petrological investigations of extraformational clasts indicate provenance from probable Cambro-Ordovician granites, metamorphic rocks (Koettlitz Group?), Ferrar dolerite and rhyolites of uncertain affinity. The sand fraction is dominated by grains derived from crystalline basement and the Beacon Supergroup, but volcanic glass, abundant above 62 mbsf, is correlated with the McMurdo Volcanic Group. X-ray diffraction analysis of mud samples shows a similar change in mineralogy over the interval 60-65 mbsf from smectite-dominated above to illite and chlorite-dominated below. The Miocene section is dated by diatom biostratigraphy at 17.5-22.4 Ma (early Miocene), which suggests an average sediment accumulation rate of about 21 m/my. The most prevalent fossil groups are diatoms, foraminifers and palynomorphs. The well-preserved marine palynomorph assemblage contains many new acritarchs, and apparently represents the first known palynomorph record from in situ lower-Miocene Antarctic sediments. Calcareous nannofossils (Thoracosphaera) are rare to few, as are macrofossils (serpulid worm tubes, echinoid spines, bryozoans, and scallop shells). Palaeoenvironmental interpretations suggest a glacimarine setting warmer than present that underwent some significant fluctuations in water depth and proximity to the ice margin. A magnetic-polarity stratigraphy has been measured for the lower c. 90 m. Four magnetozones defined below 89 mbsf are correlated within the range of Chrons C5Dr to C6 of the Magnetic Polarity Time Scale. The Miocene section has also been divided into six recurrent lithofacies: diamictite, rhythmically interlaminated finegrained sandstone and siltstone, well-stratified sandstone, poorly-stratified muddy sandstone, coarse-grained siltstone and fine-grained siltstone. No major changes in facies assemblage have been identified, implying similar variations in environmental conditions throughout. Last, the succession has been divided by sequence stratigraphic analysis into 10 units, wherein each sequence passes upward from a basal diamict into progressively finer-grained facies, interpreted as a flooding event. Each sequence is thought to record the cyclical advance and retreat of grounded ice across the site, although there is little or no record of glacial advance. The only positive evidence for sediment accumulation under grounded ice has been found in a directional clast fabric in a diamictite at 62.64 mbsf.

UR - http://www.scopus.com/inward/record.url?scp=0347468841&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0347468841

VL - 5

SP - 63

EP - 124

JO - Terra Antarctica

JF - Terra Antarctica

SN - 1122-8628

IS - 1

ER -

Robert C, Anderson J, Armienti P, Atkins C, Barrett P, Bohaty S et al. Miocene Strata in CRP-1, Cape Roberts Project, Antarctica. Terra Antarctica. 1998 Dec 1;5(1):63-124.