矿床地质2011，Vol.30Issue(4)：645-653,9.
冀东马兰庄条带状硅铁建造的变质时代及地质意义
Metamorphic chronology of the BIF in Malanzhuang of eastern HebeiProvince and its geological implications
摘要
Abstract
The Precambrian Banded Iron Formations (BIF) are the most important iron resource both in China and abroad, whether in the exploratory reserves or in the quantity of the exploitation. BIF were also the special geo-chemical sediments in the early earth history which recorded the composition and the redoxomorphic stage of the contemporary atmosphere and the ocean as well as their evolution. The paleo-weathering crust of BIF, which is the most enriched iron ore, is widely distributed in the world. However, this type of BIF has never been found in China. Why is the paleo-weathering crust of BIF absent in China? This is the main focus of this paper. The authors investigated the metamorphic chronology of the BIF in Malanzhuang by means of SHRIPMP II analysis of the zircons from the granitic rocks which occur in the interlayer of the BIF. Based on a comparative study ofthe time of the BIF formation, the authors have concluded that the BIF in China were deeply buried immediately after their formation, and subsequently they experienced regional metamorphism and migmatization. The BIF in China experienced no weathering for a long time at the earth' s surface, which is the reason why the paleo-weathering crust type of enriched iron ore cannot be found in China.关键词
地质学/条带状硅铁建造(BIF)/变质时代/古风化壳型富铁矿/冀东马兰庄Key words
geology/banded iron formations (BIF)/metamorphic chronology/paleo-weathering crust of BIF/Malanzhuang of eastern Hebei分类
地质学引用本文复制引用
李延河,张增杰,伍家善,尚龙平..冀东马兰庄条带状硅铁建造的变质时代及地质意义[J].矿床地质,2011,30(4):645-653,9.基金项目
本文得到国家自然科学基金(项目编号:40273008,40203003)、公益行业科研专项(项目编号:201111002)和地质调查项目(项目编号:1212010916067)的联合资助 （项目编号:40273008,40203003）
