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Global Geology 2014, 17(2) 86-98 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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Geochemistry and tectonic significance of Early Cretaceous granites in Highland 1248 of Daxing'anling |
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YANG Naifeng, YANG Liting and WANG Chunguang |
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1�� Heilongjiang Mining Group Co����Ltd����Harbin��150036��China; 2�� College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
The Early Cretaceous granitic complex in Highland 1248 of Daxing'anling successively consists of in- truded granodiorite��monzonite granite and syenite granite�� Through test analysis on the major��trace and rare earth elements of the intrusive complex��this study focuses on the source characteristics and tectonic environ- ment of the original magma of intrusive complex�� The results show that the intrusive rocks in Highland 1248 are meta-aluminous-peraluminous rocks in calc-alkaline series with homologous characteristics in δEu negative anomalies; the complex is enriched in LILE (��b��Cs and K) and depleted in HFSE (lanthanide��Sc��Y��U�� Nb and Ta)��displaying the geochemical characteristics of I-type granites in active continental-margin subduc- tion zones�� The complex also has the characteristics of granites after the collision of plate with rich aluminum and high potassium��but significantly depleted Nb��Ta��Ti��P and other elements��i�� e�� in the orogenic evolu- tionary stage�� The zircon U-Pb SH��IMP isotopic apparent age of the complex in Highland 1248 is 140�� 0--141. 0 Ma��and the formation time is in Early Cretaceous�� |
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Keywords��
complex rock mass
geochemistry
tectonic setting
Daxinganling
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Received Revised Online: |
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