首页|Petrogenesis and Tectonic Implications of the Paleoproterozoic A-Type Granites in the Xiong'ershan Area along the Southern Margin of the North China Craton
Petrogenesis and Tectonic Implications of the Paleoproterozoic A-Type Granites in the Xiong'ershan Area along the Southern Margin of the North China Craton
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Paleoproterozoic A-type granites are widely distributed in the southern margin of the North China Craton(SNCC),providing important information for understanding the Paleoproterozoic tectonic regimes in this area.This paper reports newly obtained whole-rock compositions and zircon U-Pb ages for the Tieluping syenogranite porphyry(TLP)and Huoshenmiao alkali granite porphyry(HSM)in the SNCC.Zircons from the TLP and HSM have U-Pb ages of 1805±12 and 1792±14 Ma,respectively.These ages are taken to date the emplacement of these intrusions.They had high total al-kali contents(K2O + Na2O>7.13 wt.%),with high 10000×Ga/Al ratios(3.06-3.41)and Zr + Y + Nb + Ce values(709 ppm-910 ppm)as well as high zircon saturation temperatures(864-970℃),indicative of A-type granite affinities.High Y/Nb(1.75-3.32),Ce/Nb(7.72-9.72),and Yb/Ta(2.89-5.60)ratios sug-gested that TLP and HSM belonged to the A2-type granite.The negative whole rock εNd(t)values(-8.4 to-6.6)and negative zircon εHf(t)values(-15.9 to-6.3)confirmed that TLP and HSM were likely gener-ated by the partial melting of an ancient continental crust.The εHf(t)(-7.4 to +4.0)values of inherited zircons in the TLP suggested that they were derived from the partial melting of Archean basement rocks.Considering the geochemical similarity of the 1.80 Ga A-type granitoids in the SNCC,we pro-pose that the TLP and HSM were formed in a post-collisional regime that was likely associated with the break-off of the Paleoproterozoic subducted slab.Upwelling of the asthenosphere provided huge heat to generate the regional 1.80 Ga A-type granite in the SNCC.
PaleoproterozoicA-type granitePost-collisionalNorth China Cratontectonicgeo-chemistry
State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China
University of Chinese Academy of Sciences,Beijing 100049,China
Henan Province Non-ferrous Metals Geological Mineral Resources Bureau,Zhengzhou 450053,China
Jiangmen Land Market Monitoring Center,Jiangmen 529000,China
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国家自然科学基金国家自然科学基金国家自然科学基金Chinese Academy of Sciences"Light of West China"Program贵州省自然科学基金cooperation project between Institute of Geochemistry中国科学院项目Henan Province Nonferrous Metals Geological Mineral Resources Bureau
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