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Successive midcrustal, high-grade metamorphic events provide insight into Mid-Archean mountain-building along the SE margin of the proto-Kaapvaal craton
2012; Geological Society of America; Volume: 124; Issue: 7-8 Linguagem: Inglês
10.1130/b30543.1
ISSN1943-2674
AutoresJ. Taylor, Gary Stevens, I. S. Buick, Cristiano Lana,
Tópico(s)earthquake and tectonic studies
ResumoResearch Article| July 01, 2012 Successive midcrustal, high-grade metamorphic events provide insight into Mid-Archean mountain-building along the SE margin of the proto–Kaapvaal craton J. Taylor; J. Taylor † †E-mails: jtaylor@sun.ac.za; gs@sun.ac.za; buick@sun.ac.za; cristianodeclana@gmail.com Search for other works by this author on: GSW Google Scholar G. Stevens; G. Stevens † †E-mails: jtaylor@sun.ac.za; gs@sun.ac.za; buick@sun.ac.za; cristianodeclana@gmail.com Search for other works by this author on: GSW Google Scholar I.S. Buick; I.S. Buick † †E-mails: jtaylor@sun.ac.za; gs@sun.ac.za; buick@sun.ac.za; cristianodeclana@gmail.com Search for other works by this author on: GSW Google Scholar C. Lana C. Lana † *Present address: Departamento de Geologia (DEGEO), Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais 35400000, Brazil †E-mails: jtaylor@sun.ac.za; gs@sun.ac.za; buick@sun.ac.za; cristianodeclana@gmail.com Search for other works by this author on: GSW Google Scholar Author and Article Information J. Taylor † G. Stevens † I.S. Buick † C. Lana † *Present address: Departamento de Geologia (DEGEO), Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais 35400000, Brazil †E-mails: jtaylor@sun.ac.za; gs@sun.ac.za; buick@sun.ac.za; cristianodeclana@gmail.com Publisher: Geological Society of America Received: 11 May 2011 Revision Received: 13 Feb 2012 Accepted: 17 Feb 2012 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2012 Geological Society of America GSA Bulletin (2012) 124 (7-8): 1191–1211. https://doi.org/10.1130/B30543.1 Article history Received: 11 May 2011 Revision Received: 13 Feb 2012 Accepted: 17 Feb 2012 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. Taylor, G. Stevens, I.S. Buick, C. Lana; Successive midcrustal, high-grade metamorphic events provide insight into Mid-Archean mountain-building along the SE margin of the proto–Kaapvaal craton. GSA Bulletin 2012;; 124 (7-8): 1191–1211. doi: https://doi.org/10.1130/B30543.1 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 SocietyGSA Bulletin Search Advanced Search Abstract In this study, we investigate the evolution of continental crust at the Paleoarchean to Mesoarchean boundary by documenting the deposition, deep burial, and partial melting of metasedimentary gneisses along the SE margin of the proto–Kaapvaal craton. Successive high-grade metamorphic events recorded by the gneisses between ca. 3.23 and 3.07 Ga not only coincided with the timing of subduction-accretion in the adjacent Barberton greenstone belt at ca. 3.23–3.22 Ga, but also with discrete pulses of potassic granitic magmatism during differentiation and consolidation of the newly assembled lithosphere. Mineral equilibria modeling demonstrates that the granulites evolved along pressure-temperature (P-T) paths similar to those documented for metamorphism in modern collisional orogens. High-temperature deformation at ca. 3.11–3.07 Ga during uplift of the terrane was coaxial with the main NE-SW–trending structural grain of the Barberton greenstone belt and reflects the regional NW-SE shortening and NE-SW orogen-parallel extension exhibited by the younger potassic granites. We reconcile these features with Mesoarchean terrane assembly in Barberton via two NW-dipping subduction zones. The trace of the first is represented by the main terrane boundary within the Barberton greenstone belt; the second resulted in accretion, burial, and high-temperature metamorphism along the SE margin of the Kaapvaal craton, with the granulites providing valuable insight into the mid- to lower-crustal response to what appears to have been a protracted accretionary orogenic event. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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