Isotopic Geochemical Characteristics of the Shimensi Tungsten-Polymetallic Deposit in Northern Jiangxi Province
详细信息
- 责任者：Xiang Xinkui (No.916 Geological Party ; Jiangxi Bureau of Geology & Mineral Exploration ; Jiujiang 332100 ; China) ; Wang Peng
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：14(3)
- 关键词：钨矿 ; tungsten ores ; 同位素地球化学 ; isotope geochemistry ; 江西 ; Jiangxi Province
- 页码：p.263-271
- 图表：illus., 3 tables, 31 refs.
- 分类号：1001
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
The Shimensi tungsten polymetallic deposit is a recently discovered superlarge deposit in the Mesozoic Cu-Mo-Au-Ag-Pb-Zn ore belt of Jiangnan block within Lower Yangtze metallogenic province. The ore bodies are thick with gentle attitude, approximately parallel to the contact surface between the biotite granodiorite and the top of the porphyraceous biotite granite. In addition, the external contact zone is an important contact type, and the major type of the mineralization is veinlet disseminated scheelite. Based on sulfur, lead and carbon isotopic characteristics, this paper studied the origin and evolution of the ore-forming material. The results show that the δ 34 S V-CDT values of the sulfide ore range from –2.53‰ to –0.91‰ with an average of –1.65‰. It is estimated that the sulfur origin is closely related to the magmatic sulfur. The 206 Pb/ 204 Pb, 207 Pb/ 204 Pb and 208 Pb/ 204 Pb ratios of sulfide ore range respectively within 18.109～18.268, 15.586～15.708 and 38.208～38.715. In combination with tectonic patterns of lead isotope and related parameters, the lead composition indicates that the metallogenic materials were closely related to magmatism, and their lead was mainly derived from the lower crust with the addition of some upper crust matter. Carbon and oxygen isotopic compositions of calcite show that carbon in the ore-forming fluid was mainly derived from the lower crust or the upper mantle.