TY - DATA T1 - Magmatism, orogeny and the origin of high-heat-producing granites in Australian Proterozoic terranes PY - 2016/06/21 AU - Sandra McLaren AU - Roger Powell UR - https://geolsoc.figshare.com/articles/journal_contribution/Magmatism_orogeny_and_the_origin_of_high-heat-producing_granites_in_Australian_Proterozoic_terranes/3453647 DO - 10.6084/m9.figshare.3453647.v1 L4 - https://ndownloader.figshare.com/files/5423519 KW - origin KW - orogenic history KW - insight KW - Th KW - concentration KW - Progressive extraction KW - crust KW - magma additions KW - Proterozoic KW - granite KW - lithospheric KW - style KW - erosional base level KW - behaviour KW - Magmatism KW - orogeny KW - crustal KW - terrane KW - magmatism KW - consequence KW - model KW - granitic KW - Geology N2 - Temperature-dependent processes such as magmatism and orogeny provide key insights into the Earth’s thermal state. We propose an integrated model for the origin of voluminous Proterozoic-aged granitic rocks in northern Australia, suggesting that the observed large range of concentrations of incompatible elements (particularly U, Th and K) was established progressively as a consequence of a hot-plate orogenic style involving little crustal thickening, combined with ‘normal’ juvenile magma additions. Progressive extraction of the heat-producing elements into the mid- to upper crust, where they remain below the erosional base level, resulted in anomalous thermal conditions that modulated the continuing orogenic history. This may represent an important style in post-Archaean lithospheric behaviour. ER -