Early Mesoproterozoic bimodal plutonism in the southeastern Gawler Craton, South Australia

Autor:	R. A. Both, Oliver Raymond, A C Purvis, W L Zang, Christopher Fanning
Rok vydání:	2007
Předmět:	geography Underplating geography.geographical_feature_category Gabbro Proterozoic Geochemistry Crust Plutonism Craton Igneous rock Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Mafic Geology
Zdroj:	Australian Journal of Earth Sciences. 54:661-674
ISSN:	1440-0952 0812-0099
DOI:	10.1080/08120090701305210
Popis:	The Curramulka Gabbronorite on Yorke Peninsula, southeastern Gawler Craton has an emplacement age of 1589 ± 5 Ma. This is similar to previously determined ages for Arthurton Granite (1582 ± 7 Ma), Tickera Granite (ca 1600 – 1575 Ma), regional alteration, the Moonta – Wallaroo mineralisation (ca 1585 Ma) and localised deformation (Tiparra Deformation). Mesoproterozoic bimodal plutonism is interpreted to have resulted from mafic underplating, emplacement of mafic magmas during lithospheric attenuation and enhanced high heat flow assisting in melting of the lower crust to form the broadly A-type Arthurton and Tickera Granites. Plutonism either directly or indirectly created advective fluid-flow to form Cu – Au mineralisation in the Moonta – Wallaroo area. The nature and characteristics of Mesoproterozoic mafic bodies on the Gawler Craton are poorly known. The Curramulka Gabbronorite has a continental tholeiitic composition and igneous layering that is partly of cumulus origin but also contains magmatic segre...
Databáze:	OpenAIRE
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