Geochemical, age, and isotopic constraints on the location of the Sino–Korean/Yangtze Suture and evolution of the Northern Dabie Complex, east central China

Abstract

Research Article| May 01, 2004 Geochemical, age, and isotopic constraints on the location of the Sino–Korean/Yangtze Suture and evolution of the Northern Dabie Complex, east central China Derek L. Bryant; Derek L. Bryant 1Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, Tennessee 37235, USA Search for other works by this author on: GSW Google Scholar John C. Ayers; John C. Ayers 1Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, Tennessee 37235, USA Search for other works by this author on: GSW Google Scholar Shan Gao; Shan Gao 2Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China, and Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China Search for other works by this author on: GSW Google Scholar Calvin F. Miller; Calvin F. Miller 3Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, Tennessee 37235, USA Search for other works by this author on: GSW Google Scholar Hongfei Zhang Hongfei Zhang 4Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China Search for other works by this author on: GSW Google Scholar GSA Bulletin (2004) 116 (5-6): 698–717. https://doi.org/10.1130/B25302.2 Article history received: 19 May 2003 rev-recd: 15 Sep 2003 accepted: 22 Sep 2003 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Derek L. Bryant, John C. Ayers, Shan Gao, Calvin F. Miller, Hongfei Zhang; Geochemical, age, and isotopic constraints on the location of the Sino–Korean/Yangtze Suture and evolution of the Northern Dabie Complex, east central China. GSA Bulletin 2004;; 116 (5-6): 698–717. doi: https://doi.org/10.1130/B25302.2 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 The Northern Dabie Complex in east central China lies between the Sino–Korean plate to the north and the Yangtze plate to the south. The Northern Dabie Complex has been variously proposed to represent a Paleozoic magmatic arc on the Sino–Korean plate, an exhumed piece of subducted Yangtze plate crust, or crust produced almost entirely by Cretaceous extension-related magmatism. Trace element compositions of Northern Dabie Complex orthogneisses and granites show arc signatures similar to those of ultra-high-pressure rocks in the central Dabie, but no mineralogical evidence of ultra-high-pressure metamorphism is pres ent in the samples investigated here. Field relationships, textures, major and trace element compositions, and ion microprobe U-Pb zircon protolith crystallization ages reveal three distinct types of gneiss: diorite gneiss xenoliths (770 ± 26 Ma, 95% confidence limit), those within first-genation highly deformed migmatitic grey gneisses (747 ± 14 Ma), and those cross-cut by second- generation Cretaceous weakly foliated felsic gneisses (127 ± 4 Ma). Unfoliated Cretaceous granites (117 ± 11 Ma, monazite Th-Pb age = 117 ± 1 Ma) intrude second- generation gneisses. Cretaceous second- generation gneisses and granites yield zircon inheritance ages of ca. 2 Ga, 700–800 Ma, and (rarely) 227–271 Ma, indicating that the Northern Dabie Complex is not simply a Cretaceous extensional terrane. The 700–800 Ma zircon ages are similar to those of granitic gneisses from the central ultra-high- pressure zone (698 ± 47 Ma) and are characteristic of the Yangtze craton. εNd values suggest that Cretaceous rocks in the Northern Dabie Complex formed by partial melting of basement with very low εNd and not by melting of first-generation or diorite gneisses. Nd-depleted mantle model ages are consistent with the time of formation of the Yangtze craton at 1.4–2.5 Ga. The Northern Dabie Complex is interpreted to be an extension of the Yangtze craton that was unaffected by ultra-high-pressure metamorphism. The Sino–Korean/Yangtze suture must lie to the north of the Northern Dabie Complex. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.