Zircon U-Pb chronology, geochemistry and Lu-Hf isotope constraints on genesis of monzoniti

Zircon U-Pb chronology, geochemistry and Lu-Hf isotope constraints on genesis of monzonitic granite from Harizha area in eastern section of East

Kunlun region

LI Qing;CUI Bo;WANG Li;PENG Bo;ZHANG Yong;JIN Ye;YIN Yue

【期刊名称】《世界地质（英文版）》 【年(卷),期】2019(022)001

【摘要】The Harizha area is located in the eastern section of East Kunlun orogenic belt .The petrology, the zircon LA-ICP-MS U-Pb chronology and the petrogeochemistry of the monzonitic granite in the area were stud -ied.The results show that the formation age of the monzonitic granite in the Harizha area is 237.4 ±1.4 Ma, which belongs to Middle Triassic .The content of SiO 2 in the rock is 61.29％--63.30％, (K2 O +Na2 O) is 5.41％--5.84％, Al2 O3 is 14.80％-15.99％, the Mg# value is 46.33--48.33, and the aluminum saturation in-dex A/CNK is 0.87--0.91.Therefore, it can be concluded that the rock belongs to the I -type granite of quasi-aluminous high potassium Ca -alkaline series.The total REE content of the rock is 118.82 ×10-6-164.54 × 10 -6 , and the La /Yb ratios range from 7.77 to 10.13.Meanwhile, the rock does not show obvious Eu anoma -lies (δEu =0.61-0.75) and is characterized by enrichment of LREE and LILE such as Rb and K , relative de-pletion of HREE and HFSE such as Nb , Ti and Ta.Zircon Hf isotopic dating exhibits