Magmatism and metamorphism at ca. 1.45 Ga in the northern Gawler Craton: The Australian record of rifting within Nuna(Columbia)

论文摘要

U-Pb monazite and zircon geochronology and calculated metamorphic phase diagrams from drill holes in the northern Gawler Craton, southern Australia, reveal the presence of ca. 1.45 Ga magmatism and metamorphism. Magmatism and granulite facies metamorphism of this age has not previously been recognised in the Gawler Craton. The magmatic rocks have steep LREE-enriched patterns and high Ga/Al values, suggesting they are A-type granites. Calculated metamorphic forward models suggest that this event was associated with high apparent thermal gradients and reached pressures of 3.2 -5.4 kbar and temperatures of 775-815℃. The high apparent thermal gradients may reflect pluton-enhanced metamorphism, consistent with the presence of A-type granites. The recognition of ca. 1.45 Ga tectonism in the northern Gawler Craton is added to a compilation of ca. 1.50 -1.40 Ga magmatism, shear zone reactivation, rift basin development and isotope resetting throughout the South and North Australian Cratons that shows that this event was widespread in eastern Proterozoic Australia. This event is stylistically similar to ca. 1.45 Ga A-type magmatism and high thermal gradient metamorphism in Laurentia in this interval and provides further support for a connection between Australia and Laurentia during the Mesoproterozoic. The tectonic setting of the 1.50-1.40 Ga event is unclear but may record rifting within the Nuna（or Columbia） supercontinent, or a period of intracontinental extension within a long-lived convergent setting.

论文目录

文章来源

类型: 期刊论文

作者: Laura J.Morrissey,Karin M.Barovich,Martin Hand,Katherine E.Howard,Justin L.Payne

来源: Geoscience Frontiers 2019年01期

年度: 2019

分类: 基础科学

专业: 地质学

单位: School of Natural and Built Environments, University of South Australia,Department of Earth Sciences, School of Physical Sciences, University of Adelaide

基金: supported by ARC Linkage Project LP160100578 (MH and JP),ARCDiscovery Project DP160104637 (MH)

分类号: P588.3;P597.3

页码: 175-194

总页数: 20

文件大小: 3521K

下载量: 20

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