Ore Genesis and Ore-Forming Age of the Tiemahabaqin Ultra-Low-Grade Iron Deposit in Chengde, Hebei Province, China

详细信息   

• 责任者：Li Lixing (Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Li Houmin
• 刊名：Rock and Mineral Analysis
• 出版年：2012
• 卷期：31(5)
• 关键词：铁矿 ; iron ores ; 河北 ; Hebei Province
• 页码：p.898-905
• 图表：3 illus., 3 tables, 25 refs.
• 分类号：1001
• issnNo：ISSN0254-5357
• isbnNo：CN11-2131/TD

摘要

 

    

The ultra-low-grade Fe ore resource (content of total Fe is lower than 20%) hosted in mafic-ultramafic complexes in Chengde plays an important role in the iron production of Hebei Province, China. In order to investigate the ore-forming age and ore genesis of the Tiemahabaqin ultra-low Fe deposit, this paper presents electron microprobe and ⁴⁰Ar/³⁹Ar isotopic data of the hornblendes from iron-bearing hornblendites. The ⁴⁰Ar/³⁹Ar plateau ages of the hornblende from hornblendites yielded 379～401 Ma, which indicates that the ore-forming process was formed in the Devonian period. Tectonically, the iron-bearing hornblendites are probably related to post-collisinoal extension after the arc-continental collision between the Bainaimiao arc belt and the northern margin of the North China craton during the latest Silurian period.