河北承德铁马哈叭沁超贫铁矿床的成因与成矿时代

李立兴; 李厚民; 王德忠; 刘明军; 杨秀清; 陈靖

河北承德铁马哈叭沁超贫铁矿床的成因与成矿时代

1.
中国地质科学院矿产资源研究所, 北京 100037
2.
中国地质科学院矿产资源研究所, 北京 100037
3.
河北省地质矿产勘查开发局第四地质大队, 河北承德 067000
4.
中国地质大学(北京), 北京 100083
5.
中国地质大学(北京), 北京 100083
6.
中国地质科学院矿产资源研究所, 北京 100037

基金项目:

中国地质大调查项目(1212011120988)

国土资源部公益性行业专项经费项目"我国北方沉积变质型、岩浆型铁矿富矿成矿地质作用研究"(201111002)

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- 收稿日期: 2012-02-19

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

摘要

摘要: 河北承德一带基性-超基性岩中的超贫铁矿石(全铁TFe含量<20%)资源在河北的铁精矿产量中占有重要地位,其中以铁马哈叭沁超贫铁矿床贡献最大。本研究以铁马哈叭沁岩体中的超贫铁矿石即钒钛磁铁矿化的角闪石岩中的角闪石为研究对象,通过电子探针分析和⁴⁰Ar/³⁹Ar测年,结合野外地质特征,探讨了超贫铁矿床的成矿时代及矿床成因。野外和岩相学特征表明,铁马哈叭沁超贫铁矿床为岩浆晚期分异型铁矿床。电子探针分析表明,角闪石岩中角闪石主量元素变化范围较小,具有富Ca、富Mg、富Na、贫K的特征,属于韭闪石和镁绿钙闪石。角闪石成因矿物学研究表明,角闪石岩主要为幔源成因,并受到了地壳物质的混染。角闪石岩中角闪石单矿物的⁴⁰Ar/³⁹Ar年龄为379~401 Ma,表明成岩成矿时代为泥盆纪,形成于白乃庙岛弧与华北克拉通北缘发生弧-陆碰撞后的伸展阶段。
- 超贫铁矿床 /
- 角闪石 /
- ⁴⁰Ar/³⁹Ar定年 /
- 铁马哈叭沁 /
- 华北克拉通
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

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河北承德铁马哈叭沁超贫铁矿床的成因与成矿时代

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

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