Citation: | CHEN Peijia, DAI Chaocheng, HUANG Cheng, WANG Xinliang. 2017. Geochemical characteristics and zircon U-Pb age of the Paleoproterozic S-type granite in Wulashan region and its geological significance[J]. Geology in China, 44(5): 959-973. doi: 10.12029/gc20170509 |
Wulashan area, located in the north part of the North China craton, has well-developed Paleoproterozoic granites, with the Nuoeryin S-type granites as the typical one. The investigation of Nuoeryin granites shows that the granites have high SiO2 (w(SiO2)=70.03%~75.43%), high Al2O3 (w(Al2O3)=13.04%~14.87%), and high K2O values (w(K2O)=5.36%~6.58%), low Mg# (< 10) and high A/CNK values, indicating that they belong to peraluminous S-type granites. They are enriched in LREE with significant differentiation between LREE and HREE (LaN/YbN=22.3-300.5), and REE patterns of the samples are of right-oblique type, with strong negative Eu anomalies(δEu=0.16-0.55). The primitive mantle-normalized trace element diagrams show enrichment of K, Rb, Th, Pb and depletion of Sr, Ba, Nb, Ta, P, Ti. The Nuoeryin granites have similar geochemical characteristics to the Paleoproterozic knondalites in Wulashan area and, and the reason is probably that Nuoeryin granites were generated by the knondalites anatexis while the Yinshan blocks and Ordos blocks experienced collision in Paleoproterzoic. The LA-ICP-MS zircon U-Pb ages of Nuoeryin granites are 1891±14 Ma and 1863±17 Ma, which represent the crystallization age of the Nuoeryin S-type granites, and the age is also contemporaneous with magmatic-metamorphic events in Khondalite belt.
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Distribution of Wulashan in North China Craton (a.b, modified after Zhao et al., 2005) and geological sketch map of the west of Wulashan area and sampling locations (c, modified after Liu et al., 2016)
Geological features in the field (a-c) and photographs of mineral features (d-f) from Nuoeryin granite
TAS diagram (a, modified after Middlemost et al., 1994), and plot of A/CNK versus A/NK (b modified after Maniar et al., 1989) for Nuoeryin granite in Wulashan
Primitive mantle-nomalized trace element diagrams and chondrite-nomalized REE patterns for Nuoeryin granite in Wulashan (nomalization value after Sun et al., 1989, and symbols in Fig 4 as for Fig 3)
CL images (a, b) and U-Pb concordia diagrams of zircons from Nuoeryin granite in Wulashan
Source discrimination diagrams for Nuoeryin granite in Wulashan
Tectonic discrimination diagrams of Nuoeryin granite in Wulashan, symbols in Fig. 7 as for Fig 3