Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica
A transect of three sites was drilled during Leg 188 of the Ocean Drilling Program (ODP), proximal to the East Antarctic Ice Sheet (EAIS) across the Prydz Bay continental shelf (Site 1166), slope (Site 1167), and rise (Site 1165). We present results of a palaeomagnetic and rock magnetic study of sed...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2003
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/2128/ |
id |
ftsouthampton:oai:eprints.soton.ac.uk:2128 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:2128 2023-07-30T03:58:32+02:00 Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica Florindo, F. Bohaty, S.M. Erwin, P.S. Richter, C. Roberts, A.P. Whalen, P.A. Whitehead, J.M. 2003 https://eprints.soton.ac.uk/2128/ unknown Florindo, F., Bohaty, S.M., Erwin, P.S., Richter, C., Roberts, A.P., Whalen, P.A. and Whitehead, J.M. (2003) Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica. Palaeogeography, Palaeoclimatology, Palaeoecology, 198 (1-2), 69-100. (doi:10.1016/S0031-0182(03)00395-X <http://dx.doi.org/10.1016/S0031-0182(03)00395-X>). Article PeerReviewed 2003 ftsouthampton https://doi.org/10.1016/S0031-0182(03)00395-X 2023-07-09T20:28:54Z A transect of three sites was drilled during Leg 188 of the Ocean Drilling Program (ODP), proximal to the East Antarctic Ice Sheet (EAIS) across the Prydz Bay continental shelf (Site 1166), slope (Site 1167), and rise (Site 1165). We present results of a palaeomagnetic and rock magnetic study of sediments recovered at sites 1165 and 1166. Magnetostratigraphic interpretations are presented for both holes and are mainly constrained by diatom and radiolarian biostratigraphies, interpreted in the light of recent refinements to Southern Ocean zonal schemes and datum calibrations for these microfossil groups. Site 1165 records a history of sedimentation on the continental rise extending back to earliest Miocene times (about 22 Ma). Several long-term changes characterise this record, including an overall trend of decreasing sedimentation rates from the bottom to the top of the hole. There is a progressive decrease in the sedimentation rate above about 308 mbsf (meters below sea floor), which is marked by a transition from dark-grey fissile claystones to greenish-grey diatom-bearing clays. At this transition, ice-rafted debris, sand grains, and total clay content also increase. The chronology presented here indicates a middle Miocene age (~14.3 Ma) for the lithological transition. Correlation to ODP Hole 747A from the Kerguelen Plateau suggests that this lithological transition coincides with the base of the Mi-3/3a 18O event, which suggests palaeoclimatic control on middle Miocene sedimentation changes at Site 1165. Core recovery was poor at Site 1166. Consequently, the magnetostratigraphic data are of limited value. The deepest cores recovered at Site 1166 record brief intervals in the early history of the EAIS for the Prydz Bay region, extending back through the early stage of glaciation to pre-glacial times. An Early Cretaceous fluvio-lacustrine unit, lagoonal deposits and sandy fluvio-deltaic units of mid–late Eocene age contain a sporadic record of the transition from humid and mild conditions to cool temperate ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Prydz Bay Southern Ocean University of Southampton: e-Prints Soton Antarctic East Antarctic Ice Sheet Kerguelen Prydz Bay Southern Ocean Palaeogeography, Palaeoclimatology, Palaeoecology 198 1-2 69 100 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
unknown |
description |
A transect of three sites was drilled during Leg 188 of the Ocean Drilling Program (ODP), proximal to the East Antarctic Ice Sheet (EAIS) across the Prydz Bay continental shelf (Site 1166), slope (Site 1167), and rise (Site 1165). We present results of a palaeomagnetic and rock magnetic study of sediments recovered at sites 1165 and 1166. Magnetostratigraphic interpretations are presented for both holes and are mainly constrained by diatom and radiolarian biostratigraphies, interpreted in the light of recent refinements to Southern Ocean zonal schemes and datum calibrations for these microfossil groups. Site 1165 records a history of sedimentation on the continental rise extending back to earliest Miocene times (about 22 Ma). Several long-term changes characterise this record, including an overall trend of decreasing sedimentation rates from the bottom to the top of the hole. There is a progressive decrease in the sedimentation rate above about 308 mbsf (meters below sea floor), which is marked by a transition from dark-grey fissile claystones to greenish-grey diatom-bearing clays. At this transition, ice-rafted debris, sand grains, and total clay content also increase. The chronology presented here indicates a middle Miocene age (~14.3 Ma) for the lithological transition. Correlation to ODP Hole 747A from the Kerguelen Plateau suggests that this lithological transition coincides with the base of the Mi-3/3a 18O event, which suggests palaeoclimatic control on middle Miocene sedimentation changes at Site 1165. Core recovery was poor at Site 1166. Consequently, the magnetostratigraphic data are of limited value. The deepest cores recovered at Site 1166 record brief intervals in the early history of the EAIS for the Prydz Bay region, extending back through the early stage of glaciation to pre-glacial times. An Early Cretaceous fluvio-lacustrine unit, lagoonal deposits and sandy fluvio-deltaic units of mid–late Eocene age contain a sporadic record of the transition from humid and mild conditions to cool temperate ... |
format |
Article in Journal/Newspaper |
author |
Florindo, F. Bohaty, S.M. Erwin, P.S. Richter, C. Roberts, A.P. Whalen, P.A. Whitehead, J.M. |
spellingShingle |
Florindo, F. Bohaty, S.M. Erwin, P.S. Richter, C. Roberts, A.P. Whalen, P.A. Whitehead, J.M. Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica |
author_facet |
Florindo, F. Bohaty, S.M. Erwin, P.S. Richter, C. Roberts, A.P. Whalen, P.A. Whitehead, J.M. |
author_sort |
Florindo, F. |
title |
Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica |
title_short |
Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica |
title_full |
Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica |
title_fullStr |
Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica |
title_full_unstemmed |
Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica |
title_sort |
magnetobiostratigraphic chronology and palaeoenvironmental history of cenozoic sequences from odp sites 1165 and 1166, prydz bay, antarctica |
publishDate |
2003 |
url |
https://eprints.soton.ac.uk/2128/ |
geographic |
Antarctic East Antarctic Ice Sheet Kerguelen Prydz Bay Southern Ocean |
geographic_facet |
Antarctic East Antarctic Ice Sheet Kerguelen Prydz Bay Southern Ocean |
genre |
Antarc* Antarctic Antarctica Ice Sheet Prydz Bay Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Prydz Bay Southern Ocean |
op_relation |
Florindo, F., Bohaty, S.M., Erwin, P.S., Richter, C., Roberts, A.P., Whalen, P.A. and Whitehead, J.M. (2003) Magnetobiostratigraphic chronology and palaeoenvironmental history of Cenozoic sequences from ODP sites 1165 and 1166, Prydz Bay, Antarctica. Palaeogeography, Palaeoclimatology, Palaeoecology, 198 (1-2), 69-100. (doi:10.1016/S0031-0182(03)00395-X <http://dx.doi.org/10.1016/S0031-0182(03)00395-X>). |
op_doi |
https://doi.org/10.1016/S0031-0182(03)00395-X |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
198 |
container_issue |
1-2 |
container_start_page |
69 |
op_container_end_page |
100 |
_version_ |
1772821320022622208 |