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Establish and Genesis of Oceanic Island Basic Volcanic Rock Early Carboniferous in Northern of Daxing’anling

KUANG Yong-sheng1,2,ZHAO Shu-yue2,QIN Xiu-feng1, MA Jiang-shui2   

  1. 1.School of Resources and Environmental, Lanzhou Univesity 730000,China; 2.Qiqihaer Branch,Heilongjiang Institute of Geological Survey, Qiqihaer 161005,China;3.China Univesity of Geosciences,Beijing 100083,China;4.Heilongjiang Institute of Geological Survey, Haerbin 150036,China
  • Received:2004-10-10 Revised:1900-01-01 Online:2005-07-26 Published:2005-07-26
  • Contact: KUANG Yong-sheng

Abstract: There occur a series of fine clastic sedimentary rock and mediumbasic volcanic rocks assemblies (including the spite and metabasic basalt) in Genhe area of North Daxing’anling Mts.,belong to Moergen Formation.The studies on their geochemical characteristis show that basic valcanic rorks high contents of Na2O,K2O,TiO2,w(Fe2O3)/w(FeO)=0.8(average) (belong to alkaline series).Enrichment in LREE and with insignificant Eu anormalies ;compared with MORB,their lightly depleted in Ti， Y， Yb,but more enriched in others elements are similar to those of ocean intraplate basalts. Their initial w(87Sr)/w(86Sr) value is 0.7043,the εNd(t) value is 3.00,indicate that their source region are related to mantlesource.Based on above data,this paper proposes that the activity of mantle plume lead to basic volcanic rocks formed,reflecting of Hawaiitype oceanic island tectonic enviroment.

Key words: North Daxing’anling Mts., Early Carboniferous, mantle plume, oceanic island, basalts

CLC Number: 

  • P588.145
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[3] YAN Zai-fei, HUANG Zhi-long, CHEN Mi, ZHOU Jia-xi, ZHAO Zheng, DING Wei. Two Distinct Mantle Sources for High-Ti Basalts in the Emeishan Overfall Basalt Province [J]. J4, 2010, 40(6): 1311-1322.
[4] ZHONG Yu-ying, XU Xi-hang. Characteristics of Plume-Related A-Type Granites: An Example from the Emeishan Large Igneous Province [J]. J4, 2009, 39(5): 828-838.
[5] ZHU Zhang-xian,ZHAO Cai-sheng,YANG Zhen-qiang. Distribution and Geochemical Characteristics of Adakites and Adakite-Like Rocks in Sulawesi, Indonisia [J]. J4, 2009, 39(1): 80-0088.
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