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2012, 31(2) 247-254 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon U--Pb dating of porphyritic monzonitic granite in Yichun and its geological significance |
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NIU Yan-Hong-1, WANG Xing-1, DONG Guo-Chen-2, CHENG Zhao-Xun-1, ZHENG Tao-1, ZHANG Yue-Long-1, HAN Zhen-Zhe-1 |
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1�� Qiqihar Branch of Heilongjiang Institute of Geological Survey��Qiqihar 161005��Heilongjiang��China; 2�� School of Earth Sciences and Resources��China University of Geosciences��Beijing 100083��China |
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Abstract��
Porphyritic monzonitic granites were widely exposed in Nancha--Jinshantun area of Yichun��Heilongjiang�� The rock body occurred as batholiths with porphyry shape��and the rocks were flesh pink medium-coarse porphyritic monzonitic granite�� Phenocrysts consisted of potash feldspar and quartz and the matrix was composed of potash feldspar��plagioclase��quartz��biotite and a few amphibole locally�� The content of SiO2 was 69. 58% �� 75. 96%��alkaline was rich with Na2O + K2O of 7. 22% �� 8. 45% ��K2O/Na2O = 1. 07 �� 1. 43 ( σ = 1. 58 �� 2. 47) ��belonging to calc-alkaline granite�� The ΣREE was 178. 68 × 10-6 �� 464. 75 × 10 -6��( La /Yb) N = 11. 6 �� 20. 22 with obvious LREE /HREE differentiation and negative Eu anomaly ( δEu = 0. 17 �� 0. 34) �� Trace elements were relatively rich in Rb��Th��U��Nd��La��Pr��and poor in Ba��Sr��P��Ti��indicating typical high-K calc-alkaline ( KCG-types) granite and post-orogenic ( POG) granite in characteristics��and formed with magma mixing origin�� The age of granites were 207 ± 2 Ma and 197 ± 1 Ma��belonging to Late Triassic and Early Jurassic��indicating magma crystallization duration after mixing�� The formation environment was ralated to the extension fuction after the continental collision between Siberia plate and North China plate�� |
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Keywords��
porphyritic monzonitic granite
zircon U --Pb dating
geological significance
Yichun
Heilongjiang
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Received Revised Online: |
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