Geological Characteristics and Metallogenesis of the Boketubayi Iron-Manganese Deposit in Altay, Xinjiang

Geoscience ›› 2015, Vol. 29 ›› Issue (6): 1309-1318.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Geological Characteristics and Metallogenesis of the Boketubayi Iron-Manganese Deposit in Altay, Xinjiang

GUO Xu-ji¹，LI Yan²，KONG Ling-hu³， ZHENG Jia-hao⁴，SUN Dong-qian²

(1. No.706 Geological Team, Xinjiang Nonferrous Geoexploration Bureau, Altay, Xinjiang 836500, China； 2. Institute of Prospecting Technology Research of Hebei Bureau of Geology and Mineral Exploration,Sanhe,Hebei 065201, China； 3. Territorial Resources Object Geological Information Center, Sanhe, Hebei 065201, China; 4. Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China)

Online:2015-12-24 Published:2016-02-29

Abstract

Abstract:

The Boketubayi iron-manganese deposit is hosted in metavolcanic-sedimentary sequence of the Lower Devonian Kangbutiebao Formation. Fluid inclusion microthermometry, H-O isotopes, and geochronological dating have been carried out to investigate the nature and source of oreforming fluids, mineralization age, and ore-forming mechanism of this deposit. Geological features of the deposit indicate that the ore body was layered, which is consistent with formation occurrence. In addition, massive, banded, striped, thin veins, and disseminated ores were observed in this study, suggesting the mineralization has exhalative-sedimentary characteristics. Fluid inclusions belong to medium-temperature (cluster between 200 and 320 ℃), low salinity (1.05% to 4.49%), and low-to medium-density Na₂O-H₂O system. Stable isotope analysis of barite yielded δD values of -129‰ to -116‰, δ¹⁸O_SMOW values of 10.4‰ to 11.6‰, and _δ¹⁸O_H2O values of 5.7‰ to 10.3‰, respectively,indicating oreforming fluids derived from the mixing of deep circulation seawater and magmatic water. The LA-ICP-MS zircon U-Pb dating yielded an age of (398.8±1.3) Ma for ore-hosted metamorphic andesite, which indicates the ore forming age of Boketubayi deposit is around 399 Ma in Early Devonian.

Key words: iron-manganese deposit, geological characteristic, mineralization, Boketubayi, Altay,Xinjiang

CLC Number:

P618.3

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Geological Characteristics and Metallogenesis of the Boketubayi Iron-Manganese Deposit in Altay, Xinjiang

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