Abstract
Petrogenesis and tectonic significance of Early Paleozoic magmatism in the northern margin of the Qilian block, northeastern Tibetan Plateau
Highlights
IntroductionAn orogeny is commonly accompanied by widespread magmatism in the earth (e.g., Harris et al, 1986; Finger et al, 1997; Sylvester, 1998; Yin and Harrison, 2000; Yin et al, 2007; Xiao et al, 2009a, 2009b; Wu et al, 2016, 2017, 2019; Zuza and Yin, 2017; Zuza et al, 2018)
We propose that the hornblende syenites are derived from an enriched mantle metasomatized by subducted material for the following reasons: (1) the samples are enriched in lithophile elements (LILE), and have high contents of La, Ce, Sr and Ba; (2) the hornblende syenites are characterized by strong fractionation between light rare earth elements (LREE) and HREE and have negative
(1) Early Paleozoic magmatism in the study area can be subdivided into two stages: 460–480 Ma and 440 Ma
Summary
An orogeny is commonly accompanied by widespread magmatism in the earth (e.g., Harris et al, 1986; Finger et al, 1997; Sylvester, 1998; Yin and Harrison, 2000; Yin et al, 2007; Xiao et al, 2009a, 2009b; Wu et al, 2016, 2017, 2019; Zuza and Yin, 2017; Zuza et al, 2018). The Qilian orogen underwent a complex orogenic process in the Early Paleozoic (e.g., Xiao et al, 2009a; Song et al, 2013; Huang et al, 2014a, 2014b, 2015a, 2015b, 2016; Wu et al, 2016, 2017; Liu et al, 2018a, 2018b; Zuza et al, 2018; Chen et al, 2018). The models that illustrate these issues include (1) bidirectional subduction (Zuo and Liu, 1987; Wu et al, 2009, 2010; Zhang et al, 2012), (2) single north-dipping subduction
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