Contrasting zircon Hf and O isotopes in the two episodes of Neoproterozoic granitoids in South China: Implications for growth and reworking of continental crust

Zheng, Yong‐Fei; Zhang, Shao‐Bing; Zhao, Zi‐Fu; Wu, Yuan–Bao; Li, Xian‐Hua; Li, Zheng‐Xiang; Wu, Fu‐Yuan

doi:10.1016/j.lithos.2006.10.003

Cited by 509 publications

(181 citation statements)

References 93 publications

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“…In contrast, the positve ε Nd (t) values point to a source of juvenile crust for the Weiya quartz syenite. That is similar to some Neoproterozoic granitoids and volcanics in South China, which were clearly derived from partial melting of juvenile crust that formed by crust-mantle differentiation in the early Neoproterozoic (Wu, R. X. et al, 2006;Zheng et al, 2007Zheng et al, , 2008. In the CAOB, therefore, most graitoids with positive ε Nd (t) values were derived from sources that are dominantly by a component of juvenile crust with a limited component of ancient crust Wu et al, 2000).…”

Section: Petrogenesis Of Weiya Quartz Syenite Weiya Quartz Syenite: Csupporting

confidence: 65%

Sr, Nd and O isotopic characters of quartz syenite in the Weiya magmatic complex from eastern Tianshan in NW China: Melting of the thickened juvenile lower crust

Zunzhong²,

et al. 2010

Geochem. J.

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New Sr-Nd-O isotopic data are reported for the early Triassic (early Indosinian) Weiya quartz syenite from eastern Central Tianshan, northwestern China, with the aim of documenting its possible source(s), constraining its petrogenesis and discussing its tectonic implications. Whole-rock Rb-Sr isochron of the Weiya quartz syenite rock yielded an age of 246.5 ± 4.8 Ma, which is well consistent with zircon SHRIMP U-Pb age. Additionally, the rock exhibits positive ε Nd (t) value (+1.36 to +1.66), medium I sr (0.7088 to 0.7090), "normal" δ 18 O value (6.9 to 8.1‰) and young Nd model ages (T DM = 0.88 to 0.91 Ga). Combined with their petrogaphic and geochemical characters, the Weiya quartz syenite is suggested to have been generated by partial melting of juvenile lower crust rocks at high temperature. The partial melting is attributed to intra-continental subduction, which resulted in thickening of the continental crust, delamination of the lithosphere root, underplating of mantle-derived magma and subsequent regional extension. Heat from underplated mantle magma caused melting of the overlying lower crustal rocks and consequent generattion of the quartz syenitic liquid. It is supposed that the intra-continental subduction was induced by tectonic conversion from the Paleo-Asian subduction-collision system to the Paleo-Thethys regime during the latest Permian or earliest Triassic in the eastern Tianshan.

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Section: Petrogenesis Of Weiya Quartz Syenite Weiya Quartz Syenite: Csupporting

confidence: 65%

Sr, Nd and O isotopic characters of quartz syenite in the Weiya magmatic complex from eastern Tianshan in NW China: Melting of the thickened juvenile lower crust

Zunzhong²,

et al. 2010

Geochem. J.

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“…Also, a magma mixing origin for peraluminous granites is more compatible with the presence of mafic enclaves in S-type granites of the LFB (e.g., Vernon et al, 1988;Elburg, 1996;Waight et al, 2001), and with other petrological studies of S-type granites from elsewhere in the world (e.g., Garcia et al, 1994;Sandeman and Clarke, 2003), and even with experimental studies (Patiño Douce, 1995). A wide variation in Hf isotopic compositions in the Dulong granites might have been caused either by insufficient mixing during the melting process or by heterogeneous contamination (e.g., Zheng et al, 2007). Winchester and Floyd, 1977), (b) Molar Al/(K + Na) versus Al/(Ca + Na + K) diagram, and (c) ACF diagram (after Chappell and White, 1992).…”

Section: Magma Mixing Between Crust-and Mantle-derived Meltssupporting

confidence: 77%

Petrogenesis of the early Paleozoic strongly peraluminous granites in the Western South China Block and its tectonic implications

Peng

Zhao³

et al. 2015

Journal of Asian Earth Sciences

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“…The crystallization ages of the igneous rocks along the Jiangnan domain are commonly younger than 850 Ma with a cluster of ∼850-820 Ma ( Fig. 16; e.g., Li, 1999;Zhou et al, 2004;Zhong et al, 2005;Wu et al, 2006;Wang et al, 2007bWang et al, , 2008aWang et al, , 2011aZheng et al, 2007Zheng et al, , 2008Zhou et al, 2009;Ma et al, 2009;Xue et al, 2010;Dong et al, 2010;Wang et al, 2010a;Zhao et al, 2011;Zhang et al, 2012cZhang et al, , 2013. These data suggest the backarc basin along the Jiangnan domain developed from ∼850 and its cessation of subduction and final closure at ∼830-820 Ma by the Jinningian Orogen ( Fig.…”

Section: Neoproterozoic Northwesterly Episodic Amalgamation Along Thementioning

confidence: 99%

“…However, an interior location within Rodinia does not fit readily with the presence of early Neoproterozoic (∼970-900 Ma) rock units of arc or back-arc basin affinities in the easternmost Yangtze Block (e.g., Shui, 1988;Li et al, , 2008aLi et al, 2006Li et al, , 2009Ye et al, 2007;Gao et al, 2009;Chen et al, 2009a,b;Shu et al, 2011;Cawood et al, 2013). Furthermore, additional age-data suggest that final assembly along the Jiangnan domain did not occur until at least ∼830 Ma (e.g., Wang et al, 2006Wang et al, , 2007bWang et al, , 2008bWang et al, ,c, 2011aWu et al, 2006;Zhou et al, 2004Zhou et al, , 2009Zheng et al, 2007Zheng et al, , 2008Zhao et al, 2011;Zhang et al, 2011cZhang et al, , 2012cZhao and Guo, 2012). As a result, the SCB has either been placed on the margin of Rodinia or external to the supercontinent (e.g., Zhao and Cawood, 1999;Torsvik et al, 2001;Yang et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

220

121

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Keywords:Metabasic rocks MORB-and/or arc-like geochemical signatures Earliest Neoproterozoic Arc and back-arc system Eastern South China Block Periphery of Rodinia a b s t r a c t U-Pb geochronology along with elemental and Nd-Hf-Os isotopic data from the earliest Neoproterozoic metabasic rocks within the Cathaysia Block of the South China Block (SCB) constrain the tectonic setting and paleogeography of the block within the Rodinia supercontinent. The metabasic rocks give zircon U-Pb ages of 969-984 Ma, ε Hf (t) values of +1.8 to +15.3 and Hf model ages of 0.92-1.44 Ga. They are subalkaline basalts that can be geochemically classified into four groups. Group 1 has low Nb contents (1.24-4.33 ppm), highly positive ε Nd (t) values (+4.3 to +5.2), and REE and multi-elemental patterns similar to fore-arc MORB-type basalt. Group 2 has Nb contents ranging from 3.13 ppm to 6.48 ppm, ε Nd (t) of +3.1 to +6.2, low Re and Os contents and high initial Os isotopic ratios, and displays an E-MORB geochemical signature. Group 3 has Nb = 7.18-29.87 ppm, Nb/La = 0.60-1.40, Nb/U = 5.0-37, Ce/Pb = 1.1-6.6, ε Nd (t) = +2.9 to +7.0, 187 Re/ 188 Os = 5.87-8.87 and ␥Os (t) = 178-772, geochemically resembling to the Pickle Nb-enriched basalt. Group 4 has strong LREE/HREE and HREE fractionation and high ε Nd (t) values (+2.3 to +5.6), and is characterized by similar element patterns to arc volcanic rocks. Serpentinites coeval to Group 4 show 187 Os/ 188 Os of 0.1143-0.1442 and ␥Os (t) of −7.8 to +0.1. Groups 1 and 2 are interpreted to originate from the N-MORB and E-MORB-like sources with the addition of an arc-like component, genetically linked to fore-and back-arc settings, respectively. Groups 3 and 4 show inputs of newly subduction-derived melt and fluid in the wedge source. These geochronological and geochemical signatures fingerprint the development of an earliest Neoproterozoic (∼970 Ma) arc-back-arc system along the Wuyi-Yunkai domain of the Cathaysia Block. Regional relationships indicate that the Wuyi-Yunkai arc-back-arc system was one of a series of separate convergent margin settings, which included the Shuangxiwu (∼970-880 Ma) and Jiangnan (∼870-820 Ma) systems that developed in the SCB. The formation and closure of these arc-back-arc systems resulted in the northwestwardly episodic amalgamation of various pieces of the Yangtze and Cathaysia to finally form the SCB. These signatures require the SCB to occupy an exterior accretionary orogen along the periphery of Rodinia during 990-820 Ma, rather than to have formed through Mesoproterozoic Sibao orogenesis within the interior of Rodinia.

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Contrasting zircon Hf and O isotopes in the two episodes of Neoproterozoic granitoids in South China: Implications for growth and reworking of continental crust

Cited by 509 publications

References 93 publications

Sr, Nd and O isotopic characters of quartz syenite in the Weiya magmatic complex from eastern Tianshan in NW China: Melting of the thickened juvenile lower crust

Sr, Nd and O isotopic characters of quartz syenite in the Weiya magmatic complex from eastern Tianshan in NW China: Melting of the thickened juvenile lower crust

Petrogenesis of the early Paleozoic strongly peraluminous granites in the Western South China Block and its tectonic implications

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

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