Geochemistry of early Paleozoic alkali dyke swarms in south Qinling and its geological significance

2003 ◽  
Vol 46 (12) ◽  
pp. 1292-1306 ◽  
Author(s):  
Chengli Zhang ◽  
Shan Gao ◽  
Guowei Zhang ◽  
Xiaoming Liu ◽  
Zaiping Yu
Keyword(s):  
Early Paleozoic ◽  
Geological Significance ◽  
South Qinling ◽  
Dyke Swarms

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

Geochronology, geochemistry and geological significance of Early Paleozoic volcanic rocks in northern East Ujimqin Banner, Inner Mongolia

2020 ◽  
Vol 36 (4) ◽  
pp. 1107-1126
Author(s):  
YANG ZeLi ◽  
◽  
HU XiaoJia ◽  
WANG ShuQing ◽  
XIN HouTian ◽  
...  
Keyword(s):  
Inner Mongolia ◽  
Volcanic Rocks ◽  
Early Paleozoic ◽  
Geological Significance

Discovery of the Early Paleozoic post-collisional granites in northern margin of the Erguna massif and its geological significance

2005 ◽  
Vol 50 (23) ◽  
pp. 2733-2743 ◽  
Author(s):  
Wu Guana ◽  
Sun Fengyue ◽  
Zhao Caisheng ◽  
Li Zhitong ◽  
Zhao Ailin ◽  
...  
Keyword(s):  
Early Paleozoic ◽  
Geological Significance ◽  
Northern Margin ◽  
Erguna Massif

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>

A newly discovered Early Paleozoic ophiolite in Dagele, Eastern Kunlun, China, and its geological significance

2017 ◽  
Vol 52 ◽  
pp. 425-435 ◽  
Author(s):  
Wei Du ◽  
Changyi Jiang ◽  
Mingzhe Xia ◽  
Zhaode Xia ◽  
Wei Zhou ◽  
...  
Keyword(s):  
Early Paleozoic ◽  
Geological Significance
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