Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U–Pb dating, geochemistry and Nd isotope

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

“…Li et al, 2010c;Wang et al, 2012b,c). Recent geochronological data have shown that the Neoproterozoic and even Paleozoic units are additionally presented within the previously mapped basement succession (e.g., Li et al, 1998;Wang et al, 2007cWang et al, , 2010bWang et al, , 2011bWang et al, , 2012cWan et al, 2007Wan et al, , 2010Yu et al, 2009Yu et al, , 2010Li et al, 2010aLi et al, ,c, 2011. Within the Cathaysia basement, there are small amounts of mafic and ultramafic rocks (e.g., amphibolite, metagabbro, metadiabase, metabasite, peridotite and pyroxenite), which occur mainly as lens, pods and fragments (e.g., Fujian BGMR, 1985;Guangxi BGMR, 1985;Guangdong BGMR, 1988;Zhejiang BGMR, 1989;Zhang et al, 2012a).…”

“…Inset (b) shows the age-spectra of detrital zircons for the Neoproterozoic sedimentary rocks from the Yunkai-Nanling and Jiangnan domains. Data in (b) from Wang et al (2007bWang et al ( , 2008aWang et al ( , 2010a, Zhang et al (2012a), Yu et al (2007Yu et al ( , 2008Yu et al ( , 2010, Wan et al (2007Wan et al ( , 2010, Li et al (2011);Zhao et al (2011) and Zhou et al (2009). An overall northwestward propagation of orogenic assembly of units is supported by the age-spectra of detrital zircons for the Neoproterozoic sedimentary rocks and their derivation from the southeast (inset (b) of Fig. 16, e.g., Wang et al, 2008aWang et al, , 2010aYu et al, 2005Yu et al, , 2010Zhang et al, 2012a).…”

“…The Yangtze and Cathaysia blocks of the SCB consist of distinctive Achaean and Paleoproterozoic crystalline basement that are overlain with angular unconformity by a middle-upper Neoproterozoic and lower Paleozoic (∼810-430 Ma) package deposited in a failed rift environment (e.g., Wang and Li, 2003;Shu et al, 2008Shu et al, , 2011Yu et al, 2010;Wan et al, 2010;Wang et al, 2012a;Zhang et al, 2012c;Zhao and Cawood, 2012, and reference therein). The eastern SCB can be subdivided into eastern Cathaysia, western Cathaysia and eastern Yangtze regions ( Fig.…”

“…The strongly peraluminous Tiantangshan and Longtang (Yunkai) and Masha (Wuyi) granites were dated at 906 ± 24 Ma (SHRIMP), 901 ± 16 Ma (LA-ICPMS) and 913 ± 11 Ma (SIMS) (e.g., Qin et al, 2006;authors' unpublished data), probably representing the time of crustal anatexis during the closure of the Wuyi-Yunkai intracontinental arc-back-arc basin. Detrital zircons with U-Pb ages of ∼1.0-0.90 Ga (peak age being ∼970 Ma) likely related to the development of the arc-back arc system are abundant in the Neoproterozoic sedimentary rocks along the Wuyi (e.g., Jianning), Nanling (e.g., Zengcheng) and Yunkai (e.g., Xinyi) domains (e.g., Yu et al, 2005Yu et al, , 2007Yu et al, , 2010Wan et al, 2007Wan et al, , 2010Wang et al, 2007cWang et al, , 2008bWang et al, ,c, 2010bLi et al, 2011). Earliest Neoproterozoic (∼1000-900 Ma) inherited grains are commonly identified in the Kwangsian granitic gneiss and Neoproterozoic gneiss with some showing positive ε Hf (t) values (inset of Fig.…”

“…16, e.g., Wang et al, 2008aWang et al, , 2010aYu et al, 2005Yu et al, , 2010Zhang et al, 2012a). The Neoproterozoic successions along the Wuyi-Yunkai domain by equigranular and rounded or subhedral, indicating detritus transported from the orogen to south or southeast (e.g., Wan et al, 2007Wan et al, , 2010Yu et al, 2007Yu et al, , 2008Yu et al, , 2010Wang et al, 2008aWang et al, , 2010bLi et al, 2011). Further to the west, along the Jiangnan domain, ∼1.0 Ga detrital zircons are poorly identified and the age-spectra are characterized by ∼0.86 Ga grains (inset (b) of Fig.…”