山东沂水县常庄钛铁矿地质特征及成因探讨

Study on Geological Characteristics and Origin of Changzhuang Ilmenite Deposit in Yishui County

沂水县常庄钛铁矿床产于中细粒含钛磁铁矿辉石角闪石岩中,该岩体既是成矿母岩又是赋矿围岩。矿体长1 800 m,平均宽75 m,控制斜深344 m,平均品位TiO28.85%,品位变化系数为104%,TFe+TiO2平均品位28.24%,品位变化系数为102%。属品位变化较不均匀的矿体。该矿床具有矿体规模大,形态简单,易于开采之特点。通过对矿床地质特征的研究,认为该矿床属基性岩浆分异型钛铁矿床,其成矿时代为古元古代。

Changzhuang ilmenite deposits in Yishui county often occurred in fine-grained titanium bearing magnetite pyroxene hornblende rock.This rock is not only ore-forming country rocks,but also ore-bearing rocks.The length of ore body is 800m,the average width is 75m,controlling oblique depth is 344m,average grade of TiO2 is 8.85%,quality coefficient of variation is 104%,average grade of TFe＋TiO2 is 28.24%,and coefficient of variation grade is 102%.It is a deposit with uneven ore grade changes.The deposit has the characteristics of large scale ore bodies,simple form and easy exploitation.Through study on geological characteristics of this deposit,it is regarded that the deposit is a basic magmatic differentiation ilmenite deposit.It was formed in Paleoproterozoic.