No. 8 Gold Geological Party of Chinese Peoples Armed Police Force

Urunchi, China

No. 8 Gold Geological Party of Chinese Peoples Armed Police Force

Urunchi, China
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Zeng X.,China University of Geosciences | Liu J.,No. 8 Gold Geological Party of Chinese Peoples Armed Police Force
Northwestern Geology | Year: 2017

LA - ICP - MS zircon U - Pb ages and whole rock geochemical data about the Wuleiku-Kelang pluton from the Dadonggou area of Altay in Xinjiang have been reported in this paper. Zircons from granbdiorite and syenogranite have well-defined oscillatory zoning, which yielded the mean 206Pb/238U ages of (404±2. 7) Ma (MSWD=0. 24) and (410. 5±2.1) Ma (MSWD=0. 3), respectively, indicating that the Kangbutiebao Formation was formed prior to 410Ma. The granitoid rocks have high SiO2 (ranging from 72. 22% to 78. 33%), total alkali (Na2O+K2O) (changing from 5. 76% to 9. 24%) and A12O3 (varying from 12. 07% to 14. 30%), and low P2O5 (ranging from 0. 02% to 0.1%) and MgO+FeO (changing from 0. 33% to 3. 50%). In addition, they are characterized by high A/CNK values (varying from 1. 04 to 1. 47) and low CaO/Na2O ratios (average ratios are less than 0. 3), which have been defined as calc-alkaline peraluminious granitoid rocks. These rocks have obvious negative anomalies of Ba, Sr, P, Ti, Nb, Ta and Eu (δEu=0. 05 ∼0. 67) and obvious enrichment of LREE, Rb, Th, U and K, resembling that these granitoid rocks were formed in the volcano arc settings. Combined with the tectonic evolution of the southern margin of Altay, it's suggested that these granitoid rocks were generated by partial melting of the crust in an active continental margin, with the residues of plagioclase, ilmenite and apatite.


Tian H.,China University of Geosciences | Chen Y.,Chang'an University | He J.,No. 8 Gold Geological Party of Chinese Peoples Armed Police Force | Zeng X.,No. 8 Gold Geological Party of Chinese Peoples Armed Police Force | Bai X.,No. 8 Gold Geological Party of Chinese Peoples Armed Police Force
Journal of Chengdu University of Technology (Science and Technology Edition) | Year: 2017

The Huoremudeke granitic pluton occurs in the central part of the Altay Orogenic Belt (AOB). The pluton is composed principally of coarse monzonitic granite, fine monzonitic granite and syenogranite. Detailed petrologie, geochronological, geochemical and Sr-Nd isotopie studies are carried out on the granitic rocks from the Huoremudeke pluton. Zircons analysis from the sample yields a weighted average mean 206 Pb/238 U age of (222. 3±1. 8) Ma (MSWD=1. 6), representing the intruding age of the pluton. Geochemically, the granitic rocks are characterized by high SiO2, A12O3, ALK, and low TiO2, MnO, MgO and P2O5 contents, with fractionated REE patterns and negative Eu anomalies (δEu = 0. 37 ∼ 0. 50). They show enrichment of LILE, and depletion of HFSE on the primitive mantle-normalized trace element diagrams and have high Sr isotopie compositions (initial 87Sr/86Sr = 0. 692 50 ∼ 0.704 11) and weakly negative ϵNd (t) values (-3. 7∼-2. 7), with Nd model ages of 1. 2∼1. 3 Ga. It is considered that the granite is probably derived from dehydration melting of biotite-bearing pelite and its source area has residual plagioclase and ilmenite. Combined with the tectonic evolution of the Altay, it is proposed that the Huoremudeke granitic pluton is formed in the syn-collision environment.

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