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作 者:Jinhong Xu Yuping Jiang Shuli Hu Zhengwei Zhang Chengquan Wu Chaofei Zheng Xiyao Li Ziru Jin Sensen Zhang Yatao Zhou
机构地区:[1]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550081,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]Henan Province Non-ferrous Metals Geological Mineral Resources Bureau,Zhengzhou,450053,China [4]Jiangmen Land Market Monitoring Center,Jiangmen 529000,China
出 处:《Journal of Earth Science》2024年第2期416-429,共14页地球科学学刊(英文版)
基 金:supported by the Natural Science Foundation of China(NSFC,Nos.U1603245,41703051,and U1812402);the Chinese Academy of Sciences“Light of West China”Program,and the Natural Science Foundation of Guizhou Province(No.[2018]1171).
摘 要: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 alkali contents(K_(2)O+Na_(2)O>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 suggested that TLP and HSM belonged to the A2-type granite.The negative whole rockε_(Nd)(t)values(−8.4 to−6.6)and negative zirconε_(Hf)(t)values(−15.9 to−6.3)confirmed that TLP and HSM were likely generated by the partial melting of an ancient continental crust.TheεHf(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 propose 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.
关 键 词:PALEOPROTEROZOIC A-type granite POST-COLLISIONAL North China Craton TECTONIC GEOCHEMISTRY
分 类 号:P548[天文地球—构造地质学] P588.121[天文地球—地质学] P534.3
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