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How long can the middle crust remain partially molten during orogeny?

2018; Geological Society of America; Volume: 46; Issue: 10 Linguagem: Inglês

10.1130/g45126.1

1943-2682

Carolina Cavalcante, Maria Helena Bezerra Maia de Hollanda, Alain Vauchez, Marcelo Kawata,

High-pressure geophysics and materials

Research Article| September 07, 2018 How long can the middle crust remain partially molten during orogeny? Carolina Cavalcante; Carolina Cavalcante * 1Department of Geology, Universidade Federal do Paraná, Curitiba, 81531-980, Brazil *E-mail: geanecarol@gmail.com Search for other works by this author on: GSW Google Scholar Maria H. Hollanda; Maria H. Hollanda 2Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil Search for other works by this author on: GSW Google Scholar Alain Vauchez; Alain Vauchez 3Géosciences Montpellier, Université de Montpellier and CNRS, 34095 Montpellier, France Search for other works by this author on: GSW Google Scholar Marcelo Kawata Marcelo Kawata 2Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Carolina Cavalcante * 1Department of Geology, Universidade Federal do Paraná, Curitiba, 81531-980, Brazil Maria H. Hollanda 2Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil Alain Vauchez 3Géosciences Montpellier, Université de Montpellier and CNRS, 34095 Montpellier, France Marcelo Kawata 2Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil *E-mail: geanecarol@gmail.com Publisher: Geological Society of America Received: 08 May 2018 Revision Received: 12 Jul 2018 Accepted: 31 Jul 2018 First Online: 07 Sep 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2018) 46 (10): 839–842. https://doi.org/10.1130/G45126.1 Article history Received: 08 May 2018 Revision Received: 12 Jul 2018 Accepted: 31 Jul 2018 First Online: 07 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Carolina Cavalcante, Maria H. Hollanda, Alain Vauchez, Marcelo Kawata; How long can the middle crust remain partially molten during orogeny?. Geology 2018;; 46 (10): 839–842. doi: https://doi.org/10.1130/G45126.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Extensive partial melting of the middle to lower crustal parts of orogens, such as of the current Himalaya-Tibet orogen, significantly alters their rheology and imposes first-order control on their tectonic and topographic evolution. We interpret the late Proterozoic Araçuaí orogen, formed by the collision between the São Francisco (Brazil) and Congo (Africa) cratons, as a deep section through such a hot orogen based on U-Pb sensitive high-resolution ion microprobe (SHRIMP) zircon ages and Ti-in-zircon and Zr-in-rutile temperatures from the Carlos Chagas anatectic domain. This domain is composed of peraluminous anatexites and leucogranites that typically exhibit interconnected networks of garnet-rich leucosomes or a magmatic foliation. Zirconium-in-rutile temperatures range from 745 to 820 °C, and the average Ti-in-zircon temperature ranges from 712 to 737 °C. The geochronologic and thermometry data suggest that from 597 to 572 Ma this domain was partially molten and remained so for at least 25 m.y., slowly crystallizing between temperatures of ∼815 and >700 °C. Significant crustal thickening must have occurred prior to 600 Ma, with initial continental collision likely before 620 Ma, a time period long enough to heat the crust to temperatures required for widespread partial melting at middle crustal levels and to favor a "channel flow" tectonic behavior. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.