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Study on the Lead Isotopic Features of the Baiyinnuoer Pb-Zn Deposit in Inner Mongolia(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第03期
Page:
230-236
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Study on the Lead Isotopic Features of the Baiyinnuoer Pb-Zn Deposit in Inner Mongolia
Author(s):
JIANG Si-hong1; NIE Feng-jun1; BAI Da-ming1; NIU Shu-yin2; WANG Bao-de2; LIU Yi-fei1; LIU Yan1
1. Key Laboratory of Metallogeny and Mineral Assessment of Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. School of Resources, Shijiazhuang University of Economics, Shijiaz
Keywords:
Pb-Zn deposit;  Pb isotope;  source of ore-forming material;  ore genesis;  Baiyinnuoer;  Inner Mongolia;  Da Hinggan Mountains
PACS:
P618.42;P618.43;P597+.2
DOI:
-
Abstract:
The Baiyinnuoer Pb-Zn Deposit in Inner Mongolia is the largest one in Da Hinggan Mountains. The ore-bodies in the deposit mainly occur along the contact zone of the granodiorite(or granodiorite porphyry)and marble. In order to determine the source of the ore-forming materials, the sulfides from the ores, and whole rocks from strata and intrusive rocks in Baiyinnuoer Pb-Zn Deposit were analyzed for the Pb isotopic compositions. The results showed that N(206Pb)/N(204Pb)of the sulfides from the ores ranged from 18.266 to 18.372 with an average of 18.296, N(207Pb)/N(204Pb)ranged from 15.501 to 15.579 with an average of 15.536, and N(208Pb)/N(204Pb)ranged from 38.016 to 38.339 with an average of 38.138. The calibrated Pb isotopes by using the ages of intrusive rocks demonstrated that the Pb isotopic compositions of the sulfides from the ores were similar with those of whole rocks from granodiorite(or granodiorite porphyry)and marble. It was suggested that the ore-forming materials might be dominantly derived from these two types of rocks. This further proved that the ore-forming of Baiyinnuoer Pb-Zn Deposit was related to the granodiorite(or granodiorite porphyry)and marble. Baiyinnuoer Pb-Zn Deposit belonged to the skarn deposit, and the lead isotopic features of which were quite different from the ore-forming materials of the SEDEX and VHMS deposits. Comparing with other Ag polymetallic deposits occurring in the central-southern part of Da Hinggan Mountains, the Pb isotopic compositions of these deposits overlapped, and were very similar. It indicated that Pb of these deposits might be derived from a similar source. It was proposed that a common Ag-rich basement or strata might exist in the region, which could provide the ore-forming materials for these Ag polymetallic deposits.

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Last Update: 2011-09-20