The practice of thematic geological mapping in medium-large scale for intermediate-basic intrusive rocks:A case study of the Wu'an iron ore concentration area, Hebei Province
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摘要:
侵入岩类的填图方法伴随侵入岩成因分类、填图实践及研究技术手段发展而不断更新和完善。近20年来,由于新技术及新方法的应用,侵入岩的研究取得了长足的进步。研究表明,一个岩浆系统可能具有多个岩浆源区,单一岩浆房和全岩浆同时结晶模式在自然界几乎不能存在。因此,基于同源岩浆演化理论的"单元-超单元"填图方法似乎应该得到修正和完善。以河北武安铁矿集区填图试点为依托,总结出一套针对中性-基性侵入岩的填图方法——"岩浆系统-子系统"填图方法。运用该填图方法,在武安地区识别出6个岩浆成矿系统,在详细研究的基础上,对每个系统进行了若干子系统的进一步划分。在此基础上,厘清了每个系统的侵入岩组装过程及成岩成矿过程。
Abstract:Mapping methods of igneous rocks have been upgraded and improved with the classification of igneous rocks, mapping practice and the development of the technology. The research on magmatic rocks has made a great progress in the past 20 years with the application of new technologies and new methods. The new research shows that there is multiple magmatic sources in a magmatic system; there isn't magmatic chamber and crystallization in a whole magmatic chamber in the natural magmatic system. The "unit-superunit" mapping method based on the theory of homogeneous magma evolution should be corrected and upgraded. Therefore, it is important to explore a set of mapping methods that are compatible with the understanding of the magmatic system. In this study, a mapping method for neutral basement intrusive rocks-magmatic "system-subsystem" mapping method is summarized as an example. Using this method, the authors identified six magmatic systems in the Wu'an area. Subsystems were divided for each magmatic system based on the characteristics of magma resource and metallogeny after the detailed research. The authors have clarified the processes of intrusive rock assembly and metallogeny in each system.
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表 1 武安地区岩浆系统特征对比
Table 1. Comparison of characteristics of magma systems in Wu'an area
岩浆成矿系统名称 子系统特征 岩浆通道类型 主要侵入岩组合 主要矿床 符山岩浆成矿系统 岩浆成矿子系统
岩浆混合子系统
壳源岩浆子系统
幔源岩浆子系统多期涌动、脉动侵入,南北向展布 正长岩(细脉)
闪长岩
角闪闪长岩
黑云母闪长岩
二长岩
二长闪长岩
斑状角闪闪长岩
斑状角闪二长闪长岩
辉长岩符山铁矿 坦岭岩浆成矿系统 岩浆成矿子系统
岩浆混染子系统
岩浆混合子系统
壳源岩浆子系统主要为顺层侵入,局部垂直侵入,南北展布 斜长斑岩
球状闪长岩
二长岩
斑状二长岩
闪长岩
角闪闪长岩
斑状斜长二长岩
斑状角闪二长岩矿床密集,北洺河铁矿、槐树交铁矿 西石门岩浆成矿系统 岩浆成矿子系统
岩浆混染子系统
岩浆混合子系统
壳源岩浆子系统垂直通道,呈中心展布 含球角闪二长岩
正长岩
角闪正长岩
二长岩
角闪二长岩
斑状二长岩
斑状斜长二长岩
斑状角闪二长岩铁矿床分布最密集,西石门铁矿,玉石洼铁矿 固镇岩浆成矿系统 岩浆成矿子系统
岩浆混染子系统
岩浆混合子系统
壳源岩浆子系统北西向岩浆通道,穹窿构造 正长岩
角闪正长岩
斑状斜长二长岩
斑状角闪二长岩
二长岩
辉长岩固镇铁矿、雷山矿、金山矿 白沙岩浆成矿系统 岩浆成矿子系统
岩浆混合子系统北西向岩浆通道,穹窿构造 二长岩
斑状斜长二长岩
斑状角闪二长岩白沙铁矿 胡峪岩浆成矿系统 岩浆成矿子系统
壳源岩浆子系统垂直岩浆通道,穹窿构造 闪长岩(脉) 胡峪铁矿 -
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