大兴安岭北段东坡小莫尔可地区中生代火山岩成因及其地质意义：元素、Hf同位素地球化学与锆石U-Pb同位素定年

doi:10.13278/j.cnki.jjuese.201704113

Abstract

Abstract: The Great Xing'an Range is one of the regions with a development of continental volcanic rocks in the Northeastern China. The volcanic rocks distribute widely, their lithofacies assemblages change greatly, and their formation is complex. We conducted a research on the geology, petrography, geochronology, and Hf isotope geochemistry for the Mesozoic volcanics erupted and emplaced in the granite zone in Xiaomoerke area. The results indicate that: the volcanic rocks in this area can be roughly divided into three assemblages: the first assemblage is mainly of dacitic pyroclastic rocks with dacite interlayer, presenting the characteristics of volcano outbreak; the second one is of basaltic trachyte andesite-trachyte andesite, showing the characteristics of overflow of volcanic magma; the third one is of trachy andesitic fused node clastic rock and breccia trachyandesite lithic crystal tuff combination. The studies on the geochemistry of volcanic lava and tuff reveal that they are all rich in alkali (w(Na₂O+K₂O)=4.88%-7.12%)and belong to the high potassium calcium alkaline series. They possess the similar trace element geochemical characteristics: significant enrichment in large ion lithophile elements (Ba, K etc.) and apparent loss of the HFSE elements (Nb, Ta, Ti, HREE). The fractionation degree of rare earth elements is moderate(LREE/HREE=8.4-8.5) and the negative Eu anomaly is small(δEu is 0.91-1.02). The Above characteristics indicate that these volcanic rocks are the products of homologous magma chamber crystallization, differentiation, and evolution, and the attribute of the magma source is of a mixed transition type of mantle and crust mantle, or of E-MORB or metasomatism of oceanic crust. The two zircon U-Pb ages obtained from the chips of dacitic crystal tuff and trachyandesitic tuff are (124.8±1.0) Ma and (123.3±1.3) Ma respectively, with Hf isotope(ε_Hf(t)=1.7-9.7,T_DM=705-407 Ma, T_DM^C=1 464-748 Ma). In combination with the research progress of regional geodynamics, we further derive that the volcanic activity occurred in the continental margin magmatic arc environment under the subduction of the Mesozoic Paleo Pacific plate to the eastern continent of China;and this coincided with the peak period (120 Ma±) of northeastern area large-scale magma underplating and lithosphere delamination, the initial magma should be adakitic magmas formed through the Paleo Pacific plate deep subduction p. The transitional rocks of adakitic magma and island arc magma might have been formed from crustal the material occurred with a certain degree of contamination during magma invasion and lithosphere delamination; in respect to the compatibility of ore-forming elements, it is confirmed that this period of magmatism provided Mo, Cu and Ag for ore-forming fluids.

Key words: geochronology, geochemistry, Hf isotope, rock genesis, volcanic rocks in the Xiaomoerke area, eastern slope of the northern Great Xing'an Range

CLC Number:

P618.4

Liu Chen, Sun Jinggui, Qiu Dianming, Gu Alei, Han Jilong, Sun Fanting, Yang Mei, Feng Yangyang. Genesis and Geological Significance of Mesozoic Volcanic Rocks in Xiaomoerke, Northern Slope of Greater Khingan Range: Hf Isotopic Geochemistry and Zircon U-Pb Chronology[J].Journal of Jilin University(Earth Science Edition), 2017, 47(4): 1138-1158.

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Genesis and Geological Significance of Mesozoic Volcanic Rocks in Xiaomoerke, Northern Slope of Greater Khingan Range: Hf Isotopic Geochemistry and Zircon U-Pb Chronology

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