Ore Genesis and Ore-forming Age of the Tiemahabaqin Ultra-low-grade Iron Deposit in Chengde, Hebei Province, China

LI Li-xing; LI Hou-min; WANG De-zhong; LIU Ming-jun; YANG Xiu-qing; CHEN Jing

2012 Vol. 31, No. 5

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LI Li-xing, LI Hou-min, WANG De-zhong, LIU Ming-jun, YANG Xiu-qing, CHEN Jing. Ore Genesis and Ore-forming Age of the Tiemahabaqin Ultra-low-grade Iron Deposit in Chengde, Hebei Province, China[J]. Rock and Mineral Analysis, 2012, 31(5): 898-905.

Citation:

Ore Genesis and Ore-forming Age of the Tiemahabaqin Ultra-low-grade Iron Deposit in Chengde, Hebei Province, China

1.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
The 4th Geological Team, Hebei Geology and Mining Bureau, Chengde 067000, China
4.
China University of Geosciences (Beijing), Beijing 100083, China
5.
China University of Geosciences (Beijing), Beijing 100083, China
6.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 20 February 2012

Publish Date: 28 October 2012

Abstract

Abstract

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, which makes a significant contribution to Chengde's iron production, this study presents electron microprobe and 40Ar/39Ar isotopic data of the hornblendes from iron-bearing hornblendites. The electron microprobe data shows that major elements of the hornblendes from hornblendites of the Tiemahabaqin complex are Ca-rich, Mg-rich, Na-rich and K-poor with limited aviation range, which were attributed to pargasites or magnesiohastingsites. The genetic mineralogy study indicates that the mantle source derived hornblendes were contaminated with crust materials. 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.
- ultra-low-grade /
- iron /
- deposit /
- hornblende /
- ⁴⁰Ar/³⁹Ar