Structure, geochronology, and petrogenesis of the Late Triassic Puziba granitoid dikes in the Mianlue suture zone, Qinling orogen, China
2015; Geological Society of America; Volume: 127; Issue: 11-12 Linguagem: Inglês
10.1130/b31249.1
ISSN1943-2674
AutoresLiqiang Yang, Jun Deng, Yıldırım Dilek, Kun‐Feng Qiu, Xing-Zhong Ji, Nan Li, Ryan D. Taylor, Jin-Yuan Yu,
Tópico(s)High-pressure geophysics and materials
ResumoResearch Article| November 01, 2015 Structure, geochronology, and petrogenesis of the Late Triassic Puziba granitoid dikes in the Mianlue suture zone, Qinling orogen, China Li-Qiang Yang; Li-Qiang Yang † 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China †lqyang@cugb.edu.cn Search for other works by this author on: GSW Google Scholar Jun Deng; Jun Deng 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Search for other works by this author on: GSW Google Scholar Yildirim Dilek; Yildirim Dilek 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China2Department of Geology & Environmental Earth Science, Miami University, Oxford, Ohio 45056, USA Search for other works by this author on: GSW Google Scholar Kun-Feng Qiu; Kun-Feng Qiu 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Search for other works by this author on: GSW Google Scholar Xing-Zhong Ji; Xing-Zhong Ji 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Search for other works by this author on: GSW Google Scholar Nan Li; Nan Li 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Search for other works by this author on: GSW Google Scholar Ryan D. Taylor; Ryan D. Taylor 3U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225, USA Search for other works by this author on: GSW Google Scholar Jin-Yuan Yu Jin-Yuan Yu 412th Gold Mine Detachment of the Chinese Armed Police Force, Chengdu 610036, China Search for other works by this author on: GSW Google Scholar Author and Article Information Li-Qiang Yang † 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Jun Deng 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Yildirim Dilek 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China2Department of Geology & Environmental Earth Science, Miami University, Oxford, Ohio 45056, USA Kun-Feng Qiu 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Xing-Zhong Ji 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Nan Li 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Ryan D. Taylor 3U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225, USA Jin-Yuan Yu 412th Gold Mine Detachment of the Chinese Armed Police Force, Chengdu 610036, China †lqyang@cugb.edu.cn Publisher: Geological Society of America Received: 08 Dec 2014 Revision Received: 31 May 2015 Accepted: 17 Jun 2015 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2015 Geological Society of America GSA Bulletin (2015) 127 (11-12): 1831–1854. https://doi.org/10.1130/B31249.1 Article history Received: 08 Dec 2014 Revision Received: 31 May 2015 Accepted: 17 Jun 2015 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Li-Qiang Yang, Jun Deng, Yildirim Dilek, Kun-Feng Qiu, Xing-Zhong Ji, Nan Li, Ryan D. Taylor, Jin-Yuan Yu; Structure, geochronology, and petrogenesis of the Late Triassic Puziba granitoid dikes in the Mianlue suture zone, Qinling orogen, China. GSA Bulletin 2015;; 127 (11-12): 1831–1854. doi: https://doi.org/10.1130/B31249.1 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 We present structural field observations, in situ zircon U-Pb ages, Hf isotopic compositions, geochemistry, and Sr-Nd isotope data from the Puziba granitoid intrusions in the Qinling orogenic belt (China). These intrusions occur as ENE-WSW–oriented dike swarms in a highly deformed phyllite-matrix mélange along several major fault zones within the Mianlue suture zone. Granitoid rocks have a relatively wide range of SiO2 (69–77 wt%, volatile-free) and total alkali contents (Na2O + K2O = 2.76–4.83 wt%), and K2O/Na2O ratios >1, and they mostly fall in the granite-granodiorite fields in the total alkalis versus silica diagram. They display relative enrichments of light rare earth elements (LREEs) and relatively flat heavy rare earth elements patterns (HREEs) with weak negative Eu anomalies (δEu = 0.56–0.95) on chondrite-normalized rare earth element (REE) diagrams. They show enrichment in Th and Zr and depletion in high field strength elements (HFSEs; e.g., Nb, P, and Ti). They are enriched in large ion lithophile elements (LILE) and LREEs and have low zircon εHf(t) (–2.8 to 4.2) values, relatively high initial 87Sr/86Sr ratios (0.7107–0.7188), and variable Mg# (22–46). Their U-Pb zircon crystallization age is ca. 215 Ma, but they also show inherited zircon age clusters in the Paleoproterozoic, Mesoproterozoic, Neoproterozoic, and Paleozoic, with two prominent peaks at ca. 753 Ma and ca. 805 Ma. The high Rb and Ta elemental abundances, smooth chondrite-normalized REE patterns, and εNd(t) values (–5 to –3) of the Puziba dike rocks characterize them as K-rich, calc-alkaline granites. Their magmas were derived from partial melting of garnet-amphibole–bearing lower crust that was triggered by slab breakoff–induced asthenospheric upwelling in the aftermath of the oblique collision of the North and South China blocks during the Late Triassic. Emplacement of the ENE-WSW–oriented Puziba dike swarms was associated with a transtensional stress regime along/across the collisional Mianlue suture zone. 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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