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Geological characteristics of granitic pegmatite at south of Shoushan, Xingcheng area in western Liaoning and its geological significance
ZHOU Shuai1, ZHANG Mei-sheng1, LI Xiao-bo1, WANG Yi-ni1, LIU Xue-song1,2
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Museum of Geology, Jilin University, Changchun 130026, China
Abstract:

Petrography, LA-ICP-MS zircon U-Pb geochronology and geochemistry were carried out for the granitic pegmatite in the south of Shoushan in Xingcheng to explore the formation age, its relationship with the Neoarchean granite in Suizhong area, and its tectonic setting. Dating results reveal that the pegmatite were formed at (2 486±8)Ma(NSWD=3.1). CL images of zircon morphology and characteristics of trace elements indicate that zircon pegmatite belongs to magmatic origin but later suffered hydrothermal alteration. Compared with biotite granite of Suizhong granite,the pegmatite shows similarities in major elements,trace elements and rare elements. The samples are characterized by high silica (SiO2=77.28%~77.9%), rich alkali (K2O+Na2O=5.5%~5.69%),and are peraluminous (A/CNK=2.53~2.54). The SiO2-K2O discrimination diagrams indicate that the granite pegmatie belongs to shoshonite series. They have low rare elements contents(ΣREE=33.1×10-6~41.01×10-6). Chondrite normalized REE patterns reveal that the samples are relatively rich in light REE but depleted in HREE. (La/Yb)N=16.33~32.41,average is 24.37%. δEu=0.92~1.11, representing none anomalies or slightly positive anomalies. The geochemical characteristics suggest that the pegmatite is related to the evolution of the biotite monzogranite.Combining with previous research results of Hf isotopic, the pegmatite and its parent rock are related to the bottom pad effect.

Keywords: granitic pegmatite   geochemistry   zircon trace elements   zircon U-Pb dating   western Liaoning   Neoarchean  
�ո����� 2016-11-11 �޻����� 2016-12-30 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2017.01.006
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