Occurrence of ice-rafted erratics and the petrology of the KR1 seamount trail from the Australian-Antarctic Ridge

A multi-disciplinary study of the KR1 segment of the Australian-Antarctic Ridge has been conducted since 2011. We present geochemical and age dating results for samples dredged from three sites on the KR1 seamount trail. The majority of the samples are alkaline ocean island basalts with subdominant...

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Published inInternational geology review Vol. 61; no. 12; pp. 1429 - 1445
Main Authors Yi, Sang-Bong, Lee, Mi Jung, Park, Sung-Hyun, Han, Seunghee, Yang, Yun Seok, Choi, Hakkyum
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 13.08.2019
Taylor & Francis Ltd
Subjects
Antarctica
Australian-Antarctic Ridge
Basalt
Carboniferous
Cretaceous
Deformation
Dredging
Gabbro
Geochemistry
Geologic depressions
Glacial erratics
Hot spots (geology)
KR1 seamount trail
Lava
Magma
Ocean floor
ocean island basalt
Petrology
Polar environments
Rhyolite
Rhyolites
Seafloor spreading
Seamounts
Sedimentary rocks
Topography (geology)
Trachyte
Volcanic eruptions
Volcanic rocks
Antarctica
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Summary:A multi-disciplinary study of the KR1 segment of the Australian-Antarctic Ridge has been conducted since 2011. We present geochemical and age dating results for samples dredged from three sites on the KR1 seamount trail. The majority of the samples are alkaline ocean island basalts with subdominant enriched tholeiites. The samples from the DG05 bathymetric depression include ice-rafted erratics from Antarctica, which consist of gabbro, diabase, various granitoids, volcanic rocks such as trachyte and rhyolite and deformed or undeformed sedimentary rocks. The main provenance of glacial erratics is considered to be the Ross Sea region. However, Carboniferous to Cretaceous ages of erratics indicate that some of these may originate from the western regions of West Antarctica. Based on the size and topography of the volcanic features and geochemical characteristics of the alkaline ocean island basalts (La/Sm N  = 2.62-3.88; Tb/Yb N  = 1.54-2.67) and the enriched tholeiites, the KR1 seamount trail is interpreted to be a submarine hotspot chain that is the product of alkaline volcanic eruption and seafloor spreading.
ISSN:0020-6814
1938-2839
DOI:10.1080/00206814.2018.1514669