Please use this identifier to cite or link to this item:
Authors: Di Roberto, A.* 
Del Carlo, P.* 
Rocchi, S.* 
Panter, K. S.* 
Title: Early Miocene volcanic activity and paleoenvironment conditions recorded in tephra layers of the AND-2A core (southern McMurdo Sound, Antarctica)
Issue Date: 2012
Series/Report no.: /8 (2012)
DOI: 10.1130/GES00754.1
Keywords: Antarctica
Volcaniclastic sediments
Mt. Morning
Victoria Land Basin
Subject Classification02. Cryosphere::02.03. Ice cores::02.03.05. Paleoclimate 
04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport 
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 
Abstract: The ANtarctic geological DRILLing program (ANDRILL) successfully recovered 1138.54 m of core from drillhole, AND-2A, in the Ross Sea sediments (Antarctica). The core is composed of terrigenous claystones, siltstones, sandstones, conglomerates, breccias, and diamictites with abundant volcanic material. In this work we present sedimentological, morphoscopic, petrographic, and geochemical data on pyroclasts recovered from core AND-2A, which provide insights on eruption styles, volcanic sources, and environments of deposition. One pyroclastic fall deposit, 12 resedimented volcaniclastic deposits and 14 volcanogenic sedimentary deposits record a history of intense explosive volcanic activity in southern Victoria Land during the Early Miocene. Tephra were ejected during Subplinian and Plinian eruptions fed by trachytic to rhyolitic magmas and during Strombolian to Hawaiian eruptions fed by basaltic to mugearitic magmas in submarine/subglacial to subaerial environments. The long-lived Mt. Morning eruptive centre, located c. 80 km south of the drillsite, was recognized as the probable volcanic source for these products on the basis of volcanological, geochemical, and age constraints. The study of tephra in the AND-2A core provides important paleoenvironment information by revealing that the deposition of primary and moderately reworked tephra occurred in a proglacial setting under generally open water marine conditions.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
PP_Geosphere_DiRoberto_etal_2012.pdf942.57 kBAdobe PDFView/Open
Geosphere_DiRoberto_etal_2012.pdf3.69 MBAdobe PDFView/Open
Show full item record

Page view(s)

Last Week
Last month
checked on Aug 15, 2018


checked on Aug 15, 2018

Google ScholarTM