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通过对大滩含低品位钛铁矿辉长岩体的地质、地球物理、地球化学及矿化特征的研究,总结了该含矿岩体特征及矿化特征,认为大滩含低品位钛铁矿辉长岩侵入于蓟县纪花石山群中,侵入时代为加里东早期,岩体长约9.5km,宽2.5~3.0km,面积约27km2,平面上形似背向南东的一个“肾状”体,岩体分异较好,以结构演化为主,岩体边部向中心可分为4个岩相带,即边缘相、过渡相(外过渡相、内过渡相)、中心相,钛铁矿主要位于内过渡相的中粗粒辉长岩中。钛铁矿化辉长岩具有高极化率、高电阻、高磁化率的物性特征,辉长岩属钙碱性、偏铝质岩石。大滩辉长岩型钛铁矿矿石中含钛矿物几乎全为钛铁矿,且其含量相对较低,但粒度粗,矿物组成较为简单。含钛铁矿的辉长岩的轻重稀土元素的分馏程度明显低于非含钛铁矿岩石。
Based on the study on the geology, geophysics, geochemistry and mineralization of the Datitan low-grade ilmenite gabbro body, the characteristics and mineralization characteristics of the ore-bearing rock mass are summarized. The gabbro intrusions invaded the Jixian Jihuaishan Group, and the intrusive age was early Caledonian. The rock mass is about 9.5km long and 2.5 ~ 3.0km wide with an area of about 27km2. A “kidney-shaped” "Body, rock body differentiation is good, the structural evolution of the main edge of the rock to the center can be divided into four lithofacies, that is, the edge facies, transitional facies (external transitional phase, internal transitional phase), the central phase The ilmenite is mainly located in the intermediate-grained gabbro within the transitional phase. The ilmenite gabbro has the characteristics of high polarizability, high resistance and high magnetic susceptibility. The gabbro is calc-alkaline and partly aluminized. The minerals in the Datitan gabbro-type ilmenite ore are almost all ilmenite, and their contents are relatively low, but the grain size is coarse and the mineral composition is relatively simple. The degree of fractionation of light and heavy rare earth elements in ilmenite-bearing gabbro is significantly lower than that of non-ilmenite-bearing rocks.