2016, 35(2) 324-347 DOI:     ISSN: 1004-5589 CN: 22-1111/P
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Keywords
alkali- feldspar granite
zircon U-Pb age
geochemistry
Xiaomoeke area
Great Xingan ��ange
Authors
ZHAO Shi-Feng
Wang Chang-Sheng
SUN Jing-Gui
ZHU Jun-Quan
GU A-Lei
WANG Zhong-Yu
ZHAO Ke-Qiang
MING Zhu
PubMed
Article by Zhao, S. F.
Article by Wang, C. S.
Article by Sun, J. G.
Article by Zhu, J. Q.
Article by Gu, A. L.
Article by Wang, Z. Y.
Article by Zhao, K. Q.
Article by Ming, Z.

Zircon U-Pb ages��geochemical characteristics of alkali- feldspar granite in Xiaomoeke area in Great Xing’an ��ange and their geological implications

ZHAO Shi-Feng, Wang Chang-Sheng, SUN Jing-Gui, ZHU Jun-Quan, GU A-Lei, WANG Zhong-Yu, ZHAO Ke-Qiang, MING Zhu

1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� Team 707��Heilongjiang Bureau of Geological Exploration for Nonferrous Metals��Suihua 152000��Heilongjiang��China; 3�� Ningxia Institute of Geological Survey��Yinchuan 750021��China

Abstract��

The authors studied the zircon LA-ICP-MS U-Pb dating and geochemical characteristics of alkali- feldspar granites in Xiaomoeke area��and discussed their petrogenesis and tectonic significance�� Most zircons of the selected samples are subhedral in shape��display distinctly oscillatory zoning structures with high values of Th/ U (0. 38 �� 0. 68)��implying a magmatic origin�� The dating results show that the alkali- feldspar granites are formed in the Early Carboniferous ( (348. 9 ±2. 1) Ma)�� The geochemical data indicate that the major elements of alkali- feldspar granites are characterized by high SiO2 (75. 78% �� 77. 01%) and K2O (4. 58% �� 4. 76%)�� and low Al 2 O 3 (11. 80% ��12. 37%)��CaO (0.28% ��0.31%) and MgO (0. 05% ��0. 09%)�� The trace ele- ments are characterized by depletion of Ba��Sr��P��Ti and enrichment of LILE such as ��b��Th��U��K�� The ��EE are characterized by the typical sea- gull lines with obvious negative Eu and enrichment of L��EE�� Geochemis- try shows that the alkali- feldspar granites are quite similar to the A- type granite�� On the base of the classification diagrams proposed by Eby��the alkali- feldspar granites can be classified into A2��and were formed under a trans- forming tectonic setting from collision to extension�� Combining with the regional research data��the authors consid- ered that it is probably related to the system of collision and merging of Xing’an terrane and Songnen terrane��

Keywords�� alkali- feldspar granite   zircon U-Pb age   geochemistry   Xiaomoeke area   Great Xingan ��ange  
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