Petrogenesis and tectonic implications of the Early Paleozoic intermediate and mafic intrusions in the South Qinling Belt, Central China: Constraints from geochemistry, zircon U–Pb geochronology and Hf isotopes

2017 ◽  
Vol 712-713 ◽  
pp. 270-288 ◽  
Author(s):  
Ruirui Wang ◽  
Zhiqin Xu ◽  
M. Santosh ◽  
Fenghua Liang ◽  
Xuehai Fu
Keyword(s):  
Central China ◽  
Hf Isotopes ◽  
Early Paleozoic ◽  
The South ◽  
South Qinling ◽  
Mafic Intrusions ◽  
Tectonic Implications

Vein-plus-wall rock melting model for the origin of Early Paleozoic alkali diabases in South Qinling Belt, Central China

2020 ◽  
Author(s):  
Fangyi Zhang ◽  
Shaocong Lai
Keyword(s):  
Partial Melting ◽  
Wall Rock ◽  
Mantle Metasomatism ◽  
Central China ◽  
Primitive Mantle ◽  
Stability Field ◽  
Alkaline Magmatism ◽  
Early Paleozoic ◽  
The South ◽  
South Qinling

<p>Early Paleozoic mafic dykes are widespread in South Qinling Belt, central China. In this study, we present new major element, trace element, zircon U–Pb age and Sr–Nd–Hf isotopic results of Early Paleozoic diabases dykes in the South Qinling Belt to explore nature of the mantle source. The South Qinling Belt diabases have low SiO<sub>2</sub> (42.1–49.5 wt%) high TiO<sub>2</sub> (2.89–5.17 wt%), variable MgO (4.0–9.4 wt%) contents. In primitive mantle normalized multielement diagrams, all samples are strongly enriched in the majority of incompatible trace elements but systematic depletion in Rb, K, Pb, Zr and Hf. The negative K and Rb anomaly together with high TiO<sub>2</sub> and high Na<sub>2</sub>O/K<sub>2</sub>O character suggest magma was derived from a source rich in amphibole. Partial melting modelling indicate 20–36% partial melting of amphibole-clinopyroxene-phlogopite veins with subsequent dissolution of ~30% orthopyroxene from the wall-rock peridotite within spinel stability field can produce the observed compositions of diabases. Additionally, South Qinling Belt diabases are characterized by moderately depleted Nd (ε<sub>Nd(t)</sub>= +2.2 to 3.3) and Hf (ε<sub>Hf(t)</sub>= +6.2 to 7.2) isotopic compositions without pronounced isotope decoupling, indicating mantle metasomatism occurred shortly prior to Early Paleozoic magmatism. It is proposed that low-degree silicate melts released from asthenosphere infiltrated and solidified within lithospheric mantle, forming non-peridotitic lithologies rich in amphibole clinopyroxene and phlogopite. Subsequent lithosphere extension caused the melting of the most easily fusible material in the lithosphere, which gave rise to the Early Paleozoic alkaline magmatism in South Qinling.</p>

Vein-plus-wall rock melting model for the origin of Early Paleozoic alkali diabases in the South Qinling Belt, Central China

Lithos ◽  
2020 ◽  
Vol 370-371 ◽  
pp. 105619
Author(s):  
Fang-Yi Zhang ◽  
Shao-Cong Lai ◽  
Jiang-Feng Qin ◽  
Ren-Zhi Zhu ◽  
Shao-Wei Zhao ◽  
...  
Keyword(s):  
Wall Rock ◽  
Central China ◽  
Early Paleozoic ◽  
The South ◽  
South Qinling

Chronology and tectonic implications of Neoproterozoic blocks in the South Qinling Orogenic Belt, Central China

2016 ◽  
Vol 30 ◽  
pp. 24-47 ◽  
Author(s):  
Fangyang Hu ◽  
Shuwen Liu ◽  
M. Santosh ◽  
Zhengbin Deng ◽  
Wei Wang ◽  
...  
Keyword(s):  
Orogenic Belt ◽  
Central China ◽  
The South ◽  
Qinling Orogenic Belt ◽  
South Qinling ◽  
Tectonic Implications

Kinematics of the Chengkou Fault in the South Qinling Orogen, Central China

2018 ◽  
Vol 114 ◽  
pp. 64-75 ◽  
Author(s):  
Jinxi Li ◽  
Zhiwu Li ◽  
Shugen Liu ◽  
Bo Ran ◽  
Yuehao Ye ◽  
...  
Keyword(s):  
Central China ◽  
Qinling Orogen ◽  
The South ◽  
South Qinling

Fluid-fluxed melting of orogenic crust in the South Qinling Belt, central China: Implications from migmatites of the Foping dome

2020 ◽  
pp. 104606
Author(s):  
He Zhang ◽  
Hong Cheng ◽  
Guanghui Wu ◽  
Xiguang Huang ◽  
Song He ◽  
...  
Keyword(s):  
Central China ◽  
The South ◽  
South Qinling

Magma source and evolution process of Early Paleozoic basalts in the South Qinling Belt

2020 ◽  
Vol 36 (7) ◽  
pp. 2149-2162
Author(s):  
ZHANG FangYi ◽  
◽  
LAI ShaoCong ◽  
QIN JiangFeng ◽  
ZHU RenZhi ◽  
...  
Keyword(s):  
Evolution Process ◽  
Magma Source ◽  
Early Paleozoic ◽  
The South ◽  
South Qinling
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