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The Lower Jurassic Hanson Formation of the Transantarctic Mountains: implications for the Antarctic sector of the Gondwana plate margin

Published online by Cambridge University Press:  27 July 2016

D.H. ELLIOT ,
D. LARSEN ,
C.M. FANNING ,
T.H. FLEMING  and
J. D. VERVOORT
D.H. ELLIOT*
Affiliation:
School of Earth Sciences and Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH 43214, USA
D. LARSEN
Affiliation:
Department of Earth Sciences, University of Memphis, Memphis, TN 38152, USA
C.M. FANNING
Affiliation:
Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia
T.H. FLEMING
Affiliation:
Department of Earth Science, Southern Connecticut State University, New Haven, CT 06515, USA
J. D. VERVOORT
Affiliation:
School of the Environment, Washington State University, Pullman, WA 99164, USA
*
†Author for correspondence: [email protected]
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Abstract

The Hanson Formation, Antarctica, consists of interbedded sandstones and tuffaceous rocks of Early Jurassic age. The sandstones, pebbly to medium-grained, range between quartzo-feldspathic and volcaniclastic, with some of the former being coarse-grained arkoses that imply proximal sources. Geochronology of detrital zircons provides evidence for source rock ages, whereas sandstone petrology demonstrates a mixed provenance. Tuffaceous strata are reworked fine to very fine-grained tuffs resulting from distal Plinian eruptions. Dated tuffs provide time constraints on the duration of volcanism. The sandstones and tuffs accumulated in a rift environment. Geochemically the tuffs are rhyolitic in composition, and the Sr and Nd isotope data together with the patterns on multi-element diagrams suggest they were derived from a volcanic arc, which is interpreted to have been located along the West Antarctic Gondwana margin. The silicic volcanism extends the distribution and timing of magmatism in the Early Jurassic along that margin. The Early Jurassic extensional regime was delimited by the plate margin region and the East Antarctic craton. The rift valley system along the East Antarctic craton margin, in which the Hanson strata accumulated, was the focus for subsequent emplacement of the intrusive and extrusive rocks of the Lower Jurassic Ferrar Large Igneous Province. The Early Jurassic extensional rifts may have been reactivated during Cretaceous–Cenozoic development of the West Antarctic Rift System.

Keywords

JurassicstratigraphygeochemistrytectonicsAntarctica
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 4 , July 2017 , pp. 777 - 803
Copyright
Copyright © Cambridge University Press 2016 

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