Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments
The present study deals with heavy mineral analysis of late Early Miocene marine sediments recovered in the McMurdo Sound region (Ross Sea, Antarctica) during the ANDRILL—SMS Project in 2007. The main objective is to investigate how heavy mineral assemblages reflect different source rocks and hence...
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Online Access: | http://hdl.handle.net/11365/980722 https://doi.org/10.1007/s00531-014-1117-3 |
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ftunivsiena:oai:usiena-air.unisi.it:11365/980722 2024-04-14T08:02:50+00:00 Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments Giorgetti, Giovanna Iacoviello, Francesco Passchier, Sandra Turbanti, Isabella Giorgetti, Giovanna Iacoviello, Francesco Passchier, Sandra Turbanti, Isabella 2014 ELETTRONICO http://hdl.handle.net/11365/980722 https://doi.org/10.1007/s00531-014-1117-3 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000351519400019 volume:104 issue:3 firstpage:853 lastpage:872 numberofpages:20 journal:INTERNATIONAL JOURNAL OF EARTH SCIENCES http://hdl.handle.net/11365/980722 doi:10.1007/s00531-014-1117-3 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84925501661 info:eu-repo/semantics/closedAccess ANDRILL Antarctica Early Miocene Heavy mineral analysi Ice sheet Ross Sea info:eu-repo/semantics/article 2014 ftunivsiena https://doi.org/10.1007/s00531-014-1117-3 2024-03-21T16:04:55Z The present study deals with heavy mineral analysis of late Early Miocene marine sediments recovered in the McMurdo Sound region (Ross Sea, Antarctica) during the ANDRILL—SMS Project in 2007. The main objective is to investigate how heavy mineral assemblages reflect different source rocks and hence different provenance areas. These data contribute to a better understanding of East Antarctica ice dynamics in the Ross Sea sector during the Early Miocene (17.6–20.2 Ma), a time of long-term global warming and sea level rise. The AND-2A drill core recovered several stratigraphic intervals that span from Early Miocene to Pleistocene and it collected a variety of terrigenous lithologies. The heavy mineral assemblages of the lower 650-m-thick sedimentary succession were analyzed through SEM observations and SEM–EDS microanalyses on heavy mineral grains. The heavy mineral analysis shows that the sediments are a mix of detritus dominated by McMurdo Volcanic Group sources most likely located in the present-day Mount Morning area (Proto-Mount Morning) with minor contribution from Transantarctic Mountains source rocks located west of the drill site. The heavy mineral assemblages in Interval 1 indicate that between 20.2 and 20.1 Ma, the grounding line of the ice sheet advanced to a position near the present-day Mount Morning volcanic center. During deposition of Interval 2 (20.1–19.3 Ma), the ice sheet most likely experienced a dynamic behavior with interval of ice advance alternating with periods of ice retreat, while Interval 3 (19.3–18.7 Ma) records further retreat to open water conditions. A dynamic behavior is noted in Interval 4 (18.7–17.6 Ma) with a decreasing contribution of materials derived from the basalts of the Mount Morning volcanic center located to the south of the drill site and a consequent increasing contribution of materials derived from the Transantarctic Mountains to the west of the drill site. © 2014, Springer-Verlag Berlin Heidelberg. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet McMurdo Sound Ross Sea Università degli Studi di Siena: USiena air Antarctic East Antarctica McMurdo Sound Mount Morning ENVELOPE(163.750,163.750,-78.450,-78.450) Ross Sea Transantarctic Mountains International Journal of Earth Sciences 104 3 853 872 |
institution |
Open Polar |
collection |
Università degli Studi di Siena: USiena air |
op_collection_id |
ftunivsiena |
language |
English |
topic |
ANDRILL Antarctica Early Miocene Heavy mineral analysi Ice sheet Ross Sea |
spellingShingle |
ANDRILL Antarctica Early Miocene Heavy mineral analysi Ice sheet Ross Sea Giorgetti, Giovanna Iacoviello, Francesco Passchier, Sandra Turbanti, Isabella Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments |
topic_facet |
ANDRILL Antarctica Early Miocene Heavy mineral analysi Ice sheet Ross Sea |
description |
The present study deals with heavy mineral analysis of late Early Miocene marine sediments recovered in the McMurdo Sound region (Ross Sea, Antarctica) during the ANDRILL—SMS Project in 2007. The main objective is to investigate how heavy mineral assemblages reflect different source rocks and hence different provenance areas. These data contribute to a better understanding of East Antarctica ice dynamics in the Ross Sea sector during the Early Miocene (17.6–20.2 Ma), a time of long-term global warming and sea level rise. The AND-2A drill core recovered several stratigraphic intervals that span from Early Miocene to Pleistocene and it collected a variety of terrigenous lithologies. The heavy mineral assemblages of the lower 650-m-thick sedimentary succession were analyzed through SEM observations and SEM–EDS microanalyses on heavy mineral grains. The heavy mineral analysis shows that the sediments are a mix of detritus dominated by McMurdo Volcanic Group sources most likely located in the present-day Mount Morning area (Proto-Mount Morning) with minor contribution from Transantarctic Mountains source rocks located west of the drill site. The heavy mineral assemblages in Interval 1 indicate that between 20.2 and 20.1 Ma, the grounding line of the ice sheet advanced to a position near the present-day Mount Morning volcanic center. During deposition of Interval 2 (20.1–19.3 Ma), the ice sheet most likely experienced a dynamic behavior with interval of ice advance alternating with periods of ice retreat, while Interval 3 (19.3–18.7 Ma) records further retreat to open water conditions. A dynamic behavior is noted in Interval 4 (18.7–17.6 Ma) with a decreasing contribution of materials derived from the basalts of the Mount Morning volcanic center located to the south of the drill site and a consequent increasing contribution of materials derived from the Transantarctic Mountains to the west of the drill site. © 2014, Springer-Verlag Berlin Heidelberg. |
author2 |
Giorgetti, Giovanna Iacoviello, Francesco Passchier, Sandra Turbanti, Isabella |
format |
Article in Journal/Newspaper |
author |
Giorgetti, Giovanna Iacoviello, Francesco Passchier, Sandra Turbanti, Isabella |
author_facet |
Giorgetti, Giovanna Iacoviello, Francesco Passchier, Sandra Turbanti, Isabella |
author_sort |
Giorgetti, Giovanna |
title |
Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments |
title_short |
Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments |
title_full |
Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments |
title_fullStr |
Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments |
title_full_unstemmed |
Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND‐2A drill core sediments |
title_sort |
early miocene antarctic glacial history: new insights from heavy mineral analysis from andrill and‐2a drill core sediments |
publishDate |
2014 |
url |
http://hdl.handle.net/11365/980722 https://doi.org/10.1007/s00531-014-1117-3 |
long_lat |
ENVELOPE(163.750,163.750,-78.450,-78.450) |
geographic |
Antarctic East Antarctica McMurdo Sound Mount Morning Ross Sea Transantarctic Mountains |
geographic_facet |
Antarctic East Antarctica McMurdo Sound Mount Morning Ross Sea Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet McMurdo Sound Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet McMurdo Sound Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000351519400019 volume:104 issue:3 firstpage:853 lastpage:872 numberofpages:20 journal:INTERNATIONAL JOURNAL OF EARTH SCIENCES http://hdl.handle.net/11365/980722 doi:10.1007/s00531-014-1117-3 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84925501661 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1007/s00531-014-1117-3 |
container_title |
International Journal of Earth Sciences |
container_volume |
104 |
container_issue |
3 |
container_start_page |
853 |
op_container_end_page |
872 |
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