10.6084/m9.figshare.3454655.v1
Laura Bracciali
Laura
Bracciali
Gianfranco Di Vincenzo
Gianfranco
Di Vincenzo
Sergio Rocchi
Sergio
Rocchi
Claudio Ghezzo
Claudio
Ghezzo
The Tiger Gabbro from northern Victoria Land, Antarctica: the roots of an island arc within the early Palaeozoic margin of
Gondwana
Geological Society of London
2016
Robertson Bay microplate
Antarctic Gondwana margin
Palaeozoic Antarctic Gondwana margin
Middle Cambrian Bowers arc
island arc signature
trace element data
Victoria Land
island arc
Tiger Gabbro
Geology
2016-06-21 12:16:07
Dataset
https://geolsoc.figshare.com/articles/dataset/The_Tiger_Gabbro_from_northern_Victoria_Land_Antarctica_the_roots_of_an_island_arc_within_the_early_Palaeozoic_margin_of___Gondwana/3454655
<p>The Tiger Gabbro layered intrusion is one of the few mafic intrusive bodies found along the ancient Antarctic Gondwana margin.
Major and trace element data and Sr–Nd isotope compositions for gabbronorites indicate an island arc signature for the Tiger
Gabbro parental magma. This is the first evidence for an island arc from plutonic rocks in northern Victoria Land. The interpretation
of the Tiger Gabbro as the roots of an Early Cambrian island arc (535 ± 21 Ma, Sm–Nd age), integrated with geochemical and
geochronological data from the literature, matches the occurrence of the Glasgow volcanic rocks in the southern Bowers terrane,
which possibly represents its effusive counterpart. A scenario for the early Palaeozoic Antarctic Gondwana margin is hence
proposed in which the Tiger volcanic arc developed on the Robertson Bay microplate in response to subduction of the palaeo-Pacific
plate. The Tiger arc igneous activity was coeval to the Wilson continental arc (represented by the Granite Harbour intrusive
rocks), with the two subduction zones merging southwards into one. The migration of the Wilson arc towards the forearc region
in turn generated the Middle Cambrian Bowers arc.
</p>