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- W2085283432 abstract "Research Article| August 01, 1975 Age of Metamorphism and Uplift in the Alpine Schist Belt, New Zealand D. S. SHEPPARD; D. S. SHEPPARD 1Joint Mineral Sciences Research Laboratory, Victoria University, Wellington, New Zealand3Present address: Chemistry Department, University of Otago, Dunedin, New Zealand. Search for other works by this author on: GSW Google Scholar C. J. ADAMS; C. J. ADAMS 2Institute of Nuclear Sciences, Department of Scientific and Industrial Research, Lower Hutt, New Zealand Search for other works by this author on: GSW Google Scholar G. W. BIRD G. W. BIRD 1Joint Mineral Sciences Research Laboratory, Victoria University, Wellington, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information D. S. SHEPPARD 1Joint Mineral Sciences Research Laboratory, Victoria University, Wellington, New Zealand3Present address: Chemistry Department, University of Otago, Dunedin, New Zealand. C. J. ADAMS 2Institute of Nuclear Sciences, Department of Scientific and Industrial Research, Lower Hutt, New Zealand G. W. BIRD 1Joint Mineral Sciences Research Laboratory, Victoria University, Wellington, New Zealand Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (8): 1147–1153. https://doi.org/10.1130/0016-7606(1975)86<1147:AOMAUI>2.0.CO;2 Article history First Online: 01 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 D. S. SHEPPARD, C. J. ADAMS, G. W. BIRD; Age of Metamorphism and Uplift in the Alpine Schist Belt, New Zealand. GSA Bulletin 1975;; 86 (8): 1147–1153. doi: https://doi.org/10.1130/0016-7606(1975)86<1147:AOMAUI>2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract Potassium-argon ages from the Alpine schist belt in south-east Nelson, New Zealand, range from 6 to 143 m.y.; the youngest ages are from rocks closest to the Alpine fault. The K-Ar ages cannot be consistently correlated with metamorphic grade, and there is evidence that degassing of minerals has occurred on a small scale, producing a smooth radiogenic argon concentration gradient spatially related to the Alpine fault. Degassing does not appear to have involved net argon loss or gain from the schist belt as a whole.The setting of the K-Ar ages in the regional context of the Mesozoic Rangitata orogeny allows a reassessment of previous models of metamorphism and uplift of the schist belt, and a new model of two-stage uplift and metamorphism in Late Jurassic and late Cenozoic times is proposed. Metamorphism of schist occurred in Jurassic time followed by uplift and cooling during mid-Cretaceous time. In late Cenozoic time, vigorous vertical movements of the Alpine schist belt initiated degassing of radiogenic argon, resulting in a spectrum of disturbed “Rangitata” ages from 4 to 140 m.y. along a narrow belt close to the Alpine fault. It is estimated that 5,000 m of uplift commenced 4 ± 2 m.y. ago. 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." @default.
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- W2085283432 title "Age of Metamorphism and Uplift in the Alpine Schist Belt, New Zealand" @default.
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