Geochemical zonation across a Neoproterozoic orogenic belt: Isotopic evidence from granitoids and metasedimentary rocks of the Jiangnan orogen, China

Detrital zircon U–Pb ages of the Proterozoic metaclastic-sedimentary rocks in Hainan Province of South China: New constraints on the depositional time, source area, and tectonic setting of the Shilu Fe–Co–Cu ore district

“…970 Ma for detrital zircons from the SE Yangtze Block, Yao et al (2012) proposed that the Grenville orogeny in the South China was multi-stage. However, Wang et al (2014b) proposed that the assembly of the Yangtze with the Cathaysia Blocks took place after 825 Ma, consistent with the previous consideration that the amalgamation of the two Blocks was not completed until ca. 820 Ma or even later (see Li et al, 2011 for a review).…”

“…Detrital zircon analysis offers a way to resolve these questions (Nelson, 2001), as zircon has the ability to withstand the effects of weathering, erosion, abrasion, and post-crystallization alteration, can survive multiple episodes of transportation, diagenesis, and metamorphism up to amphibolite facies, and has an inherently stable U-Pb isotopic system (Fedo et al, 2003). The age distribution of detrital zircon populations in (meta)sedimentary successions has been successfully used as a powerful proxy to constrain both the provenance characteristics and maximum depositional ages of clastic sedimentary rocks, to establish spatio-temporal connections among different stratigraphic successions, and to test or clarify the affiliation of different blocks or microcontinents, and thereby to unravel tectonic histories and paleogeographical reconstructions of paleocontinents or terranes, which is a key component of research into geodynamics of basin formation and orogenic processes (e.g., Gerdes and Zeh, 2006;Zhao et al, 2011;Cawood et al, 2013a;May et al, 2013;Wang et al, 2014b). By means of both SHRIMP II and LA-ICP-MS techniques coupled with cathodoluminescence (CL) imaging, this paper presents U-Pb analyses of detrital zircon from the Shilu Group and overlying Shihuiding Formation in the Shilu district.…”

Detrital zircon evidence for the reactivation of an Early Paleozoic syn-orogenic basin along the North Gondwana margin in South China

“…The detrital zircon age pattern for sample DSB from the Youyang section with its prominent peak at around 880 Ma is similar to the age spectrum of the Neoproterozoic arc accretionary succession exposed immediately to the southeast, along the Jiangnan Uplift (Zhou et al, 2009;Zhao et al, 2011;Cawood et al, 2013;Xu et al, 2013;Wang et al, 2014) (Fig. 12a, e).…”

“…The uplift is composed mainly of Neoproterozoic low-grade metasedimentary rocks, and corresponds with the Neoproterozoic Jiangnan orogen (X.L. Wang et al, 2007;Zheng et al, 2008;Wang et al, 2014). Early Paleozoic strata are largely absent from the region of the uplift due to erosion .…”

Neoproterozoic crustal growth of the Southern Yangtze Block: Geochemical and zircon U–Pb geochronological and Lu-Hf isotopic evidence of Neoproterozoic diorite from the Ailaoshan zone

“…(5) This model is supported by the presence of Neoproterozoic (826-750 Ma) diorites , adakitic rocks Zhao and Zhou, 2007) and granitoids Wang et al, 2014a;Zhao et al, 2013) along the western, northern and eastern margins of the Yangtze Block that are considered to be derived from mafic lower crust or juvenile arc crust. On the basis of above considerations, it is herein proposed that the Adebo quartz diorites were likely produced by partial melting of juvenile mafic lower crust.…”