[an error occurred while processing this directive] Global Geology 2019, 22(1) 36-49 DOI:   10.3969/j.issn.1673-9736.2019.01.05  ISSN: 1673-9736 CN: 22-1371/P
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geochemistry
U-Pb dating
Lu-Hf isotopes
Middle Triassic
East Kunlun orogenic belt
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LI Qing
CUI Bo
WANG Li
PENG Bo
ZHANG Yong
JIN Ye
YIN Yue
PubMed
Article by Li Q
Article by Cui B
Article by Wang L
Article by Peng B
Article by Zhang Y
Article by Jin Y
Article by Yin Y
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 Qing1, CUI Bo2, WANG Li1, PENG Bo3, ZHANG Yong4, JIN Ye1, YIN Yue1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
3. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
4. The 3rd Geological Prospecting Institute of Qinghai Province, Xining 810029, China
ժҪ�� 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 SiO2 in the rock is 61.29%—63.30%,(K2O+Na2O) is 5.41%—5.84%,Al2O3 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 that the average εHf(t) is -2.4 and the average of two-stage model age (tDM2) is 1 417 Ma,indicating that the source rocks are mainly crustal materials.It can be concluded from research findings and regional geological structural analysis that the monzonitic granite in the Harizha area originated from partial melting of the Mesoproterozoic mafic lower crust in the later stage of the subduction of the Paleo-Tethys Ocean.
�ؼ����� geochemistry   U-Pb dating   Lu-Hf isotopes   Middle Triassic   East Kunlun orogenic belt  
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 Qing1, CUI Bo2, WANG Li1, PENG Bo3, ZHANG Yong4, JIN Ye1, YIN Yue1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
3. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
4. The 3rd Geological Prospecting Institute of Qinghai Province, Xining 810029, China
Abstract: 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 SiO2 in the rock is 61.29%—63.30%,(K2O+Na2O) is 5.41%—5.84%,Al2O3 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 that the average εHf(t) is -2.4 and the average of two-stage model age (tDM2) is 1 417 Ma,indicating that the source rocks are mainly crustal materials.It can be concluded from research findings and regional geological structural analysis that the monzonitic granite in the Harizha area originated from partial melting of the Mesoproterozoic mafic lower crust in the later stage of the subduction of the Paleo-Tethys Ocean.
Keywords: geochemistry   U-Pb dating   Lu-Hf isotopes   Middle Triassic   East Kunlun orogenic belt  
�ո����� 2019-02-02 �޻����� 2019-03-02 ����淢������  
DOI: 10.3969/j.issn.1673-9736.2019.01.05
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Supported by Project of Geological Exploration Fund of Qinghai Province in 2017(No.20170420BKY013)

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