The occurrence characteristics and metallotectonic evolution of Cihai iron ore deposit in Xinjiang
The occurrence characteristics and metallotectonic evolution of Cihai iron ore deposit in Xinjiang
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作者：
Zuo Guo-chao
磁海铁矿存款是下二叠统产于东天山南缘裂谷中的一个次火山-矿浆侵入-热液冲刷交代存款矿床。近年来，通过对慈海隐藏铁矿存款的露天开采，发现在矿后早期，多期辉绿岩墙从不同方向贯穿陡北倾铁矿体，破坏了铁矿体的完整性，将其分割成许多小的南倾体。通过测绘，确定矿体主体由两个块状透镜状矿包组成，倾向340°，倾角70°~80°。这些南倾小矿体实际上是主矿体的矿后展布破碎体，其产状是主矿体的假产状。本文重建了磁海铁矿存款的矿体形态和成矿构造模式。
Cihai iron ore deposit is a subvolcanic-ore pulp intrusive-hydrothermal scouring replacement deposit, which is occurred in the rift of the southern margin of the Eastern Tianshan Mountains in the Lower Permian epoch. Through opencut mining of Cihai hidden iron ore deposit in recent years, it is found that there are multiperiodic diabase walls penetrated the steeply north-inclining iron ore bodies in different directions in early postmineral period so as to destroy the integrity of the iron ore bodies and divide them into many small south-inclining bodies. By survey and mapping, the authors ascertain that the main bodies consist of two bulky lens-shaped bags of ore with 340° direction of dip and 70°～80° angle of inclination. In fact, those small south-inclining bodies are the main iron ore bodies postmineral diabase walls dismembered and their occurrence is the pseudo-occurrence of the main iron ore bodies. In this article, the authors reconstruct the shape of iron ore bodies and the metallotectonic model of Cihai iron or deposit.