大兴安岭鄂伦春地区满克头鄂博组火山岩形成年代及地球化学

doi:10.13686/j.cnki.dzyzy.2022.04.001

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Abstract The zircon U-Pb dating result indicates that the volcanic rocks from Manketouebo Formation in Oroqen area of Daxinganling Mountains were formed in the Late Jurassic(152.9±1.7 Ma) based on the analysis of chronology and geochemical characteristics of the rocks. The volcanic rocks are characterized by rich Si and alkali, poor Ca and Mg, low Mg^# and very low Cr, Co and Ni contents, with enrichment of LILEs(K, Rb and Ba) and LREE, and depletion of HFSEs (Nb, Ta and Ti) in trace elements. The volcanic rocks have the characteristics of crust source, with Rb/Sr value of 0.66 averagely, much higher than N-MORB (0.03), OIB (0.047) and E-MORB (0.033). The average Ti/Zr value of 13.94 is consistent with the range of crust-derived magma(<20), indicating that the primary magma of volcanic rocks originated from partial melting of crustal rocks. According to the rock geochemical characteristics and regional existing research data, it is considered that the formation of volcanic rocks in the study area is related to the southeastward subduction of Mongolian-Okhotsk Ocean.

Key words： Manketouebo Formation zircon U-Pb dating geochemistry Oroqen area Daxinganling Mountains

Received: 07 July 2021

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P597

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	WANG Da-ke
	LIU Jun-shuai
	SUN Jing-yao

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WANG Da-ke,LIU Jun-shuai,SUN Jing-yao. FORMING AGE AND GEOCHEMISTRY OF THE VOLCANIC ROCKS FROM MANKETOUEBO FORMATION IN OROQEN QI, DAXINGANLING MOUNTAINS[J]. GEOLOGY AND RESOURCES, 2022, 31(4): 459-464,578.

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http://manu25.magtech.com.cn/Jweb_dzyzy/EN/10.13686/j.cnki.dzyzy.2022.04.001 OR http://manu25.magtech.com.cn/Jweb_dzyzy/EN/Y2022/V31/I4/459

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