Age constraints on metamorphism and the development of a metamorphic core complex in Fiordland, southern New Zealand

Abstract

Research Article| May 01, 1988 Age constraints on metamorphism and the development of a metamorphic core complex in Fiordland, southern New Zealand G. M. Gibson; G. M. Gibson 1Darling Downs Institute, Toowoomba, Queensland 4350, Australia Search for other works by this author on: GSW Google Scholar I. McDougall; I. McDougall 2Research School of Earth Sciences, Australian National University, Canberra ACT 2001, Australia Search for other works by this author on: GSW Google Scholar T. R. Ireland T. R. Ireland 2Research School of Earth Sciences, Australian National University, Canberra ACT 2001, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information G. M. Gibson 1Darling Downs Institute, Toowoomba, Queensland 4350, Australia I. McDougall 2Research School of Earth Sciences, Australian National University, Canberra ACT 2001, Australia T. R. Ireland 2Research School of Earth Sciences, Australian National University, Canberra ACT 2001, Australia Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (5): 405–408. https://doi.org/10.1130/0091-7613(1988)016<0405:ACOMAT>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G. M. Gibson, I. McDougall, T. R. Ireland; Age constraints on metamorphism and the development of a metamorphic core complex in Fiordland, southern New Zealand. Geology 1988;; 16 (5): 405–408. doi: https://doi.org/10.1130/0091-7613(1988)016<0405:ACOMAT>2.3.CO;2 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 Fiordland, southern New Zealand, contains two primary geologic components: an elongate core comprising high-pressure (>12 kbar) granulite facies orthogneisses (western Fiordland orthogneiss) and a structurally overlying mid-Paleozoic plutonic-metasedimentary complex with subordinate metavolcanics (Tuhua Sequence). The contact between these two components is a major structural discontinuity or decollement hitherto defined as the Doubtful Sound thrust, but reinterpreted here as a ductile shear zone separating lower and upper crustal plates generated during continental extension. Strongly lineated Lower Cretaceous mylonites occur throughout this zone; they formed prior to separation of New Zealand from Australia (at ∼80 Ma).Continental rifting was accompanied by increased heat flow, silicic to mafic magmatism, and the widespread resetting of mineral isotopic systems. Thus, in terms of its overall tectonic setting and tectonothermal history, Fiordland bears a striking resemblance to the metamorphic core complexes of the North American Cordillera. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.