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PubMed
Article by Zou X
Article by Zhang Y
Article by Yan W
Article by Dong Y
Article by Chen H
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Geochronological and geochemical characteristics of Early Cretaceous granites in Songling area,northern Great Xing'an Range
ZOU Xiao-wen1, ZHANG Yan-long1,2, YAN Wei-bing3, DONG Yu1, CHEN Hui-jun4
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China;
3. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049, China;
4. Shengyang Center of Geological Survey, China Geological Survey, Shengyang 110034, China
Abstract: This study presents new zircon U-Pb geochronological and whole-rock geochemical data for Early Cretaceous granites from Songshulin and Ergenhe plutons in Songling area, northern Great Xing'an Range, to determine their formation age and petrogenesis. Magmatic zircons from Songshulin monzogranite and Ergenhe syenogranite yield weighted mean 206Pb/238U ages of 122±1 Ma and 125±1 Ma, respectively, indicating that they were products of the Early Cretaceous magmatic activity. Whole rock geochemical data show that they belong to high potassium calc-alkaline, metaluminous to weakly peraluminous (A/CNK<1.05) series, and are enriched in light rare earth elements and Rb, K, Pb, but depleted in high rare earth elements and Nb, Ta, Sr, P, Ti, geochemically similar to I-type granites. In addition, the Songshulin pluton is characterized by high Ba (650×10-6) and Sr (344×10-6) contents, geochemically similar to high-Sr granites. The characteristics of Songshulin pluton are similar to those of the Daheishan alkali feldspar granite, Sishilidianzi granite porphyry and Xinlin granite complex, suggesting that the Songshulin granitic magma was derived from mixing of felsic melts formed by partial melting of juvenile basic lower crustal source, and mafic melts generated by partial melting of a mantle source. By contrast, the Ergenhe pluton is characterized by low Ba (75.2×10-6) and Sr (4.1×10-6) contents, falling into low-Sr granite area with the Ganhe alkali feldspar granite. It is indicated that the Ergenhe granitic magma might be originated from the low degree partial melting of the alkaline basalts within the northern Great Xing'an Range. These data, combined with previous studies, indicate that the generation of the Songling Early Cretaceous granites in the northern Great Xing'an Range was related to the lithospheric delamination caused by the westward subduction of the Paleo-Pacific plate.
Keywords: Songling area   Early Cretaceous   geochronogy   petrogenesis   northern Great Xingan Range  
�ո����� 2019-05-05 �޻����� 2019-06-10 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2019.03.007
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