Early Neoproterozoic accretionary assemblage in the Cathaysia Block: Geochronological, Lu–Hf isotopic and geochemical evidence from granitoid gneisses

Reconstructing South China in Phanerozoic and Precambrian supercontinents

“…This succession was intruded in the midNeoproterozoic by massive, peraluminious granites, and unconformably overlain by a mid-to late Neoproterozoic sedimentary and volcanic cover succession (Li et al, 2003a;Wang et al, 2012d;Wang et al, 2013b;Wang et al, 2014c;Zhao, 2015;Zhao and Cawood, 2012 Block is from 1000-810 Ma but with variation in spatial distribution of the age data: in the eastern Jiangnan Orogen dated igneous rocks range from 970-890 Ma (Li et al, 2009;Ye et al, 2007) and from 870-850 Ma (Yao et al, 2016b;Yao et al, 2015), in the central Jiangnan…”

“…840 Ma (Li et al, 2010;Shu et al, 2008b;Wang et al, 2013b;Zhang et al, 2012a). Thus, available age data suggest that periods of magmatic activity may be restricted in their spatial distribution Wang et al, 2014c) and that future additional data, in combination with field and geochemical constraints, may enable further structural subdivisions, especially within the Jiangnan Orogen. Mafic volcanic rocks with ages in the range ca.…”

“…Earlier pulses of peraluminious granites have been recognized, such as those in the Wuyi-Yunkai domain of Cathaysia that range in age from 985-913 Ma (Wang et al, 2014c). These likely reflect periodic arc accretion events or coupling between the down-going and overriding plates within an evolving convergent plate margin framework (cf., Cawood et al, 2011).…”

Neoproterozoic arc-related andesite and orogeny-related unconformity in the eastern Jiangnan orogenic belt: Constraints on the assembly of the Yangtze and Cathaysia blocks in South China

“…Further evidence for the 0.83-0.8 Ga timing of assembly was obtained from stratigraphic, geochronological and geochemical studies on the Neoproterozoic sedimentary sequences of the Jiangnan orogenic belt (Chen et al, 1995(Chen et al, , 1997Wang et al, 2010;Xu et al, 2014;Yao et al, 2013). These arc systems have been variously related to west-dipping, east-dipping and divergent double-sided subduction (e.g., Cawood et al, 2013;Wang et al, 2014;Zhao, 2014).…”

Constraining timing and tectonic implications of Neoproterozoic metamorphic event in the Cathaysia Block, South China

“…Therefore, previous tectonic models that suggest multiple arc systems within the Cathaysia Block and Jiangnan belt Wang et al, 2013Wang et al, , 2014 and/or divergent double-sided subduction beneath both the Yangtze and Cathaysia blocks (Zhao, 2015) are valid solutions that account for both the age and character of constituent rock units and timing of tectonothermal events.…”