caa a22 4500 606149457 CHVBK 20210128100534.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00531-014-1117-3 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1117-3 Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND-2A drill core sediments [Elektronische Daten] [Francesco Iacoviello, Giovanna Giorgetti, Isabella Turbanti Memmi, Sandra Passchier] 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 (17.6-20.2Ma), 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 20.1Ma, the grounding line of the ice sheet advanced to a position near the present-day Mount Morning volcanic center. During deposition of Interval 2 (20.1-19.3Ma), the ice sheet most likely experienced a dynamic behavior with interval of ice advance alternating with periods of ice retreat, while Interval 3 (19.3-18.7Ma) records further retreat to open water conditions. A dynamic behavior is noted in Interval 4 (18.7-17.6Ma) 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. Springer-Verlag Berlin Heidelberg, 2014 Antarctica nationallicence ANDRILL nationallicence Early Miocene nationallicence Heavy mineral analysis nationallicence Ice sheet nationallicence Ross Sea nationallicence Iacoviello Francesco Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, 05508-120, São Paulo, SP, Brazil aut Giorgetti Giovanna Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente, Università di Siena, Via Laterina 8, 53100, Siena, Italy aut Turbanti Memmi Isabella Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente, Università di Siena, Via Laterina 8, 53100, Siena, Italy aut Passchier Sandra Department of Earth and Environmental Studies, Montclair State University, 07043, Montclair, NJ, USA aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/3(2015-04-01), 853-872 1437-3254 104:3<853 2015 104 531 https://doi.org/10.1007/s00531-014-1117-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1117-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Iacoviello Francesco Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, 05508-120, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Giorgetti Giovanna Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente, Università di Siena, Via Laterina 8, 53100, Siena, Italy aut NATIONALLICENCE 700 1- Turbanti Memmi Isabella Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente, Università di Siena, Via Laterina 8, 53100, Siena, Italy aut NATIONALLICENCE 700 1- Passchier Sandra Department of Earth and Environmental Studies, Montclair State University, 07043, Montclair, NJ, USA aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/3(2015-04-01), 853-872 1437-3254 104:3<853 2015 104 531