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2016, 35(4) 942-954 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Geological and geochemical characteristics of ��aohe pillow basalts of Heilongjiang Province and its tectonic implication |
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HE Song, SUN Xiao-Meng, ZHANG Xu-Qing, WAN Kuo, ZHENG Han, LI Duo-Zi |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
Based on field geological investigation��petrological research and geochemical analysis are carried on to confirm the tectonic implication of the ��aohe basalt�� The studies indicate that the basalt has typical character- istics of pillow structure��quenching rim��intermediate hollow skeletal and spinifex textures��revealing that they are formed in the environment of submarine eruption�� The analysis samples show geochemical features of high TiO2�� MgO and low Al2O3 ��CaO��P2O5 and K2O��and are enriched in large ion lithophile elements (��b��Sr and Ba)�� While the trace element spider diagram shows a upward type��and the ��EE diagram shows a right deviation (∑L��EE/∑H��EE is 5.8 ��6.5) without δEu anomaly (0. 92 ��0. 97)��indicating the characteristics of ocean is- land basalts�� Tectonic discrimination diagrams of major and trace element reveal that they are formed in the oceanic island and intra-plate setting�� Compared with the geochemical characteristics of Azores-type and Hawaii-type oceanic island��the samples show the significant characteristics of Hawaii-type ocean island�� The studies of source and petrogenesis suggest the samples derivated from mantle source��added melting metasomatic mantle��and influenced by the circulation between mantle and crust�� The results implied that the ��aohe pillow basalt belongs to Hawaii-type ocean island basalt��and formed in the intra-plate setting of off-axis volcanism during the stage of oceanic crustal consumption��providing direct evidence to the existence of mature ocean basin in the ��aohe area�� Combining with the regional geological research��the authors suggest that the ��aohe area experienced tectonic evolution of the paleo- Pacific plates expansion��mantle plume upwelling in the intra-plate setting of off-axis��oceanic crustal consumption�� obduction-accretion with Jiamusi Massif�� |
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Keywords��
��aohe
pillow basalt
oceanic island
Hawaii-type oceanic island
Heilongjiang Province
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