梅山铁矿富铁熔浆运移的探讨

梅山铁矿床是产于中生代陆相火山岩中的一个大型富铁矿,属矿浆成因。本文通过对矿体中的V₂O₅/TFe比值的变化,V₂O₅/TFe与铁、磷组分的关系,成矿构造,矿体中的晶洞构造,成矿温度,围岩蚀变及硫同位素等方面的研究,认为,形成梅山铁矿富铁矿体的富铁熔浆是在矿床的南端汇集并形成,并向北从相对高处向相对低处侧向流动。形成这样的地质环境条件主要是岩浆侵入作用导致上覆火山岩的褶皱构造、侵入体的岩穹构造及接触破碎带构造等。

STUDY ON MIGRATION OF THE IRON-RICH MAGMA OF THE MEISHAN IRON DEPOSIT

Meishan is a large iron-rich ore deposit that occurred in Mesozoic continental volcanic series. According to the variation of ratio V2O5/TFe, the relationship between V2O5/TFe and iron and phosphorus content, the minerogenic tectonics, the crystal caves in the orebodies, the ore-forming temperature, the alteration of the host rock and sulphur isotope compositions etc., the author consider that the iron-rich magma was gathered and formed at the southern margin of the ore deposit which flowed northward from relatively high place to lower one. The geologic environment was mostly resulted from the intrusion of magma which led to folding of the overlying volcanic series, the formation of the intrusive dome and the contact broken zone.