Strongly peraluminous granites of Mesozoic in Eastern Nanling Range, southern China: Petrogenesis and implications for tectonics

Sun, Tao; Xiao-hong, Zhou; Chen, Peirong; Li, Huimin; Zhou, Hongying; Wang, Zhicheng; Shen, Wangqiang

doi:10.1360/03yd0042

Cited by 105 publications

(79 citation statements)

References 20 publications

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“…Their zircon U-Pb ages for these massive granites statistically fall into a range from 202 Ma to 248 Ma, with two age-peaks of~239 Ma and~220 Ma for Wan et al (2007Wan et al ( , 2010, Wang et al (2007cWang et al ( , 2011bWang et al ( , 2012, Chen and Jahn (1998), Li et al (2010e), Charvet et al (1994Charvet et al ( , 1996Charvet et al ( , 2010, Chen et al (2008a), Zeng and Liao (2000), Zeng et al (2008), Yang et al (2010), Zhang et al (2010aZhang et al ( , 2010bZhang et al ( , 2011aZhang et al ( , 2011b, Liu et al (2003aLiu et al ( , 2008b, Ding et al (2005), Fu et al (2004), Li and Gui (1991), Geng et al, 2006;Wu et al (2008), Zhang et al (2012), Chen et al (2009), Shu (2006, Shu et al (1991Shu et al ( , 1999Shu et al ( , 2008b, Peng et al (2005), Shen et al (1998Shen et al ( , 2008, Sun et al (2005), Zhai et al (2010), Chen and Jahn (1998) magma emplacement (see Fig. 8a-b; e.g., Xu et al, 2003;Wang et al, 2007c;…”

Section: Triassic Igneous Rocksmentioning

confidence: 99%

Phanerozoic tectonics of the South China Block: Key observations and controversies

et al. 2013

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Section: Triassic Igneous Rocksmentioning

confidence: 99%

Phanerozoic tectonics of the South China Block: Key observations and controversies

et al. 2013

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“…The flat subduction of the Paleo-Pacific plate beneath the SCB in Mesozoic might have terminated beneath the belt, where there existed contemporaneous bimodal magmatism, diagnostic of the continental arc to intra-arc rift setting due to slab rollback (Jiang et al, 2009 and references therein); (2) The Early Yanshanian granitic magmatism took place only in the Nanling region, with a southeastward-younging trend, in comparison with the distribution of the Late Yanshanian (140-90 Ma) volcanic and intrusive rocks near to the coast (Gilder et al, 1991;Chen and Jahn, 1998;Zhou and Li, 2000;Sun et al, 2003;Wang et al, 2005;Li et al, 2006;Li and Li, 2007;Li et al, 2007a). Li and Li (2007) attributed this younging trend to the slab rollback or high-angle subduction of the Paleo-Pacific plate (Fig.…”

Section: Geodynamics For W-sn Metallogenymentioning

confidence: 99%

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Liang

Dong

Jiang

et al. 2016

Ore Geology Reviews

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The Xitian tungsten-tin (W-Sn) polymetallic deposit, located in eastern Hunan Province, South China, is a recently explored region containing one of the largest W-Sn deposits in the Nanling W-Sn metallogenic province. The mineral zones in this deposit comprise skarn, greisen, structurally altered rock and quartz-vein types. The deposit is mainly hosted by Devonian dolomitic limestone at the contact with the Xitian granite complex. The Xitian granite complex consists of Indosinian (Late Triassic, and Yanshanian (Late Jurassic-Early Cretaceous, 165-141 Ma) granites. Zircons from two samples of the Xitian granite dated using laser ablationinductively coupled mass spectrometer (LA-ICPMS) U-Pb analysis yielded two ages of 225.6 ± 1.3 Ma and 151.8±1.4 Ma, representing the emplacement ages of two episodic intrusions of the Xitian granite complex. Molybdenites separated from ore-bearing quartz-veins yielded a Re-Os isochron age of 149.7±0.9 Ma, in excellent agreement with a weighted mean age of 150.3±0.5 Ma. Two samples of muscovites from ore-bearing greisens yielded 40 Ar/ 39 Ar plateau ages of 149.5±1.5 Ma and 149.4±1.5 Ma, respectively. These isotopic ages obtained from hydrothermal minerals are slightly younger than the zircon U-Pb age of 151.8±1.4 Ma of the Yanshanian granite in the Xitian area, indicating that the W-Sn mineralization is genetically related to the Late Jurassic magmatism. The Xitian deposit is a good example of the Early Yanshanian regional W-Sn ore-forming event (160-150 Ma) in the Nanling region. The relatively high Re contents (8.7 to 44.0 ppm, average of 30.5 ppm) in molybdenites suggest a mixture of mantle and crustal sources in the genesis of the ore-forming fluids and melts. Based upon previous geochemical studies of Early Yanshanian granite and regional geology, we argue that the Xitian W-Sn polymetallic deposit can be attributed to back-arc lithosphere extension in the region, which was probably triggered by the break-off of the flat-slab of the Palae-Pacific plate beneath the lithosphere.

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“…Because the Mesozoic Nanling granites show a middle belt plutons texture feature which regarded as formation in depth of 6.5-13 km, in combination with the thickness of today's crust of Nanling Range being about 33-40 km, Sun et al (2005) presumed that the crustal thickness of South China was ≤50 km in the Indosinian period. Using the similar logic, if the emplacement depth of the Indosinian granites was formed at ~19 km, we can presume that crustal thickness in the Indosinian period was likely more than 50 km.…”

Section: Geological Implicationsmentioning

confidence: 99%

Mineralogical feature and geological significance of muscovites from the Longyuanba Indosinian and Yanshannian two-mica granites in the eastern Nanling Range

Tao

Cai

et al. 2014

Sci. China Earth Sci.

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Emplacement P-T condition estimations using granites are important for understanding metamorphic and erosional processes of orogenic belt. Granites are widespread in South China and a majority of them are peraluminous. Particularly, over 91% of the Indosinian granites exposed in the region are peraluminous in composition. It is extremely hard to determine the pressure of intrusion of these peraluminous granites due to the absence of amphibole, a good mineral barometer commonly identified in metaluminous granites. Muscovite is a common mineral in peraluminous granites, certain kind of it could be used as a mineral barometer to constrain the emplacement pressure of peraluminous granites. In this paper, results of petrographic and geochemical studies of muscovites from the Indosinian and early Yanshanian two-mica granites at the Longyuanba in the eastern Nanling Range are reported. Based on petrographic studies, the primary muscovite can be discriminated from the secondary muscovites. Muscovites from the Indosinian two-mica granites are enriched in Ti, Al, Mg, and Na, and depleted in Fe and Mn. Geochemically, these muscovites were considered as primary, whereas those from the Yanshanian two-mica granites fall into the area of secondary muscovite on discrimination diagrams. Barometer estimations show that pressures calculated for primary muscovites are accurate, but those calculated for secondary muscovites are overestimated. The average pressure of emplacement of the Longyuanba Indosinian two-mica granites is 5.9 kbar, corresponding to ~19 km in depth, suggesting that the Indosinian granitic magmas were probably generated by partial melting of a thickened crust root in a compressional tectonic setting. emplacement depth, muscovite, peraluminous granites, Longyuanba complex, Nanling Range Citation:Tao J H, Li W X, Cai Y F, et al. 2014. Mineralogical feature and geological significance of muscovites from the Longyuanba Indosinian and

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Strongly peraluminous granites of Mesozoic in Eastern Nanling Range, southern China: Petrogenesis and implications for tectonics

Cited by 105 publications

References 20 publications

Phanerozoic tectonics of the South China Block: Key observations and controversies

Phanerozoic tectonics of the South China Block: Key observations and controversies

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Mineralogical feature and geological significance of muscovites from the Longyuanba Indosinian and Yanshannian two-mica granites in the eastern Nanling Range

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