2016, 35(4) 942-954 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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Keywords
��aohe
pillow basalt
oceanic island
Hawaii-type oceanic island
Heilongjiang Province
Authors
HE Song
SUN Xiao-Meng
ZHANG Xu-Qing
WAN Kuo
ZHENG Han
LI Duo-Zi
PubMed
Article by He, S.
Article by Sun, X. M.
Article by Zhang, X. Q.
Article by Wan, K.
Article by Zheng, H.
Article by Li, D. Z.

Geological and geochemical characteristics of ��aohe pillow basalts of Heilongjiang Province and its tectonic implication

HE Song, SUN Xiao-Meng, ZHANG Xu-Qing, WAN Kuo, ZHENG Han, LI Duo-Zi

College of Earth Sciences��Jilin University��Changchun 130061��China

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��

Keywords�� ��aohe   pillow basalt   oceanic island   Hawaii-type oceanic island   Heilongjiang Province  
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