Thurston Island (West Antarctica) between Gondwana subduction and continental separation: a multi-stage evolution revealed by apatite thermochronology

Zundel, Maximilian; Spiegel, Cornelia; Mehling, André; Lisker, Frank; Hillenbrand, Claus-Dieter ORCID: https://orcid.org/0000-0003-0240-7317; Monien, Patrick; Klügel, Andreas. 2019 Thurston Island (West Antarctica) between Gondwana subduction and continental separation: a multi-stage evolution revealed by apatite thermochronology. Tectonics, 38 (3). 878-897. https://doi.org/10.1029/2018TC005150

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Abstract/Summary

The first low‐temperature thermochronological data from Thurston Island, West Antarctica, provide insights into the poorly constrained thermo‐tectonic evolution of the paleo‐Pacific margin of Gondwana since the Late Paleozoic. Here we present the first apatite fission track (AFT) and apatite (U‐Th‐Sm)/He (AHe) data from Carboniferous to mid‐Cretaceous (meta‐) igneous rocks from the Thurston Island area. Thermal history modeling of AFT dates of 145–92 Ma and AHe dates of 112–71 Ma, in combination with kinematic indicators, geological information and thermobarometrical measurements, indicate a complex thermal history with at least six episodes of cooling and reheating. Thermal history models are interpreted to reflect Late Paleozoic to Early Mesozoic tectonic uplift of pre‐Jurassic arc sequences, prior to the formation of an extensional Jurassic–Early Cretaceous back‐arc basin up to 4.5 km deep, which was deepened during intrusion and rapid exhumation of rocks of the Late Jurassic granite suite. Overall Early to mid‐Cretaceous exhumation and basin inversion coincided with an episode of intensive magmatism and crustal thickening and was followed by exhumation during formation of the Zealandia‐West Antarctica rift and continental break‐up. Final exhumation since the Oligocene was likely triggered by activity of the West Antarctic rift system and by glacial erosion.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2018TC005150
ISSN:	0278-7407
Additional Keywords:	Gondwana break-up, thermochronology, apatite fission track (AFT), apatite(U-Th-Sm)/He(AHe), basin ecolution, landscape evolution
Date made live:	12 Feb 2019 11:50 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/520538

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2018TC005150

ISSN:

0278-7407

Additional Keywords:

Gondwana break-up, thermochronology, apatite fission track (AFT), apatite(U-Th-Sm)/He(AHe), basin ecolution, landscape evolution

Date made live:

12 Feb 2019 11:50 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/520538