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Petrogenesis of the Early Cretaceous Laojunshan monzogranite at the southern margin of the North China Craton: Constrains on the transition of the tectonic regime
Author(s) -
CAO Leitao,
TANG Huayun,
ZHENG Jianping,
REN Hongwei,
YU Chunmei,
XU Zhou,
HE Shuai
Publication year - 2017
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13191
Subject(s) - petrogenesis , craton , margin (machine learning) , geology , cretaceous , china , tectonics , petrology , earth science , paleontology , geochemistry , geography , archaeology , machine learning , computer science
Voluminous Mesozoic magmatic rocks containing abundant Au-Mo polymetallic mineralization resources are developed in the Xiaoqinling-Xiong’ershan district of the southern margin of the North China Craton (NCC). The widely distributed intrusions are mainly of intermediate-acidic in composition and formed during the Late Jurassic-Early Cretaceous (Ding et al., 2011; Hu et al., 2012; Li N et al., 2012; Mao et al., 2010; Zhao et al., 2012). Previous studies on representative Late Triassic -early Early Cretaceous plutons such as the Laoniushan, Fangshanyu, Wenyu and Niangniangshan granites in the western and northern regions of the XiaoqinlingXiong’ershan district have revealed that they are characterized by high Sr/Y ratios and thus indicate the existence of thickened crust under compressional setting beneath the Xiaoqinling-Xiong’ershan district prior to ca. 130 Ma (Hu et al., 2012; Zhao et al., 2012). However, precise timing of the tectonic transformation of the lithosphere from compression to extension remain unclear. Here, the detailed petrography and new zircon U-Pb ages and Hf isotope as well as whole rock geochemistry and Sr-Nd-Pb isotopes are presented for the Laojunshan pluton, with the aim toinvestigate their petrogenesis, and to further constrain the geodynamic process of the lithosphere evolution in the southern margin of the NCC.