Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 483-494.doi: 10.13278/j.cnki.jjuese.201502112

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Metallogenic and Geological Characteristics and Prospecting Potential of Meng'entaolegai Multi Metal Metallogenic Area in Inner Mongolia

Pang Xuejiao, Song Weimin, Fu Junyu, Tao Nan   

  1. Shenyang Institute of Geology and Mineral Resources/Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China
  • Received:2014-07-12 Published:2015-03-26

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Abstract:

The geochemistry and geochronology of the tonalite, granodiorite and adamellite dismantled from the Meng'entaolegai rock are studied. The geochemical analyses show the content of SiO2 is between 67.41% and 76.21%, while the content of K2O is between 3.00% and 5.64%. The tonalite, granodiorite and adamellite all belong to the series of high potassium ca-alkaline. From early to late of their formation,the acidity and alkalinity are enhanced,while the aluminum, magnesium and iron are reduced. The Al2O3/(Na2O+CaO+K2O) values are higher than 1.1, the standard mineral calculation C is higher than 1%, n(87sr)/n(86sr) is generally greater than 0.708. The ratio of n(143Nd)/n(144Nd) falls in the range of 0.512 4 to 0.513 7, the characteristics of the S-type granite, while they belong to the per-aluminous granite based on A/CNK (1.013 to 1.249) and A/NK (1.16 to 1.50). The rockmass is mainly from the melten shell material. They are enriched in LILE elements of Rb, K, U, Th, depleted of Ti. The deficiency of Ba, Sr may reflect that the source is derived from the partial melting of the crust. The LA-ICP-MS dating respectively presents three weighted average ages for the tonalite, granodiorite and adamellite: (260±34) Ma, (234±1) Ma, and (230±1) Ma. It indicates the existence of the magmatic activity during Middle Triassic and Indosinian period. According to the distribution of minerals and ores, as well as the δ34S, Pb, O isotopic data of the deposits, the source of metallogenic materials was mainly related to the magmatic activity in Yanshan period, the corresponding mother rock may exist in deep underground in the western prospecting area. The rock and the stratum are mainly responsible for the favorable wall rock in the ore-forming process; the fault structures played a significant role in ore flowing and storing. Further attention should be paid to the ore prospecting work.

Key words: Meng'entaolegai polymetallicdeposit, metallogenic prospective area, metallogenic geological characteristics, geochemical, chronology, S-type granite

CLC Number: 

  • P618.2

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