天祝大滩含低品位钛铁矿辉长岩体及其矿化特征  

CHARACTERISTICS OF THE LOW GRADE ILMENITE GABBRO ROCK IN DATAN OF TIANZHU COUNTY

作　　者：付男 张海峰 陈耀宇 冯兰君 雷祥军 罗高培 

机构地区：[1]甘肃省地矿局第三地勘院,甘肃兰州730050

出　　处：《甘肃地质》2015年第2期44-50,共7页Gansu Geology

摘　　要：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27km^2，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46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。This paper summarises rock and mineral characteristics of the low grade ilminite gabbro rock by study of geology, geophysical and geochemistry. The rock intrusived in Jixian period Huashishan Gr. of the early Caledonian. The length of the rock is 9.5 kilometers and the width 2 to 3 meters, the area is 27 square kilometers. The rock back to the south east, kidney shaped and divided into four lithofacies from edge to core： marginal facies, outer transition facies, inner transition facies which the ilmenite occurrence and middle facies. The ilmenite gabbro rock has the characteristic of high polarizability, resistivity and magnetisability. The gabbro rock is calc-alkaline and metaluminous. The degree of HREE and LREE fractionation are significantly lower than no ilminite gabbro rock. The content of ilmenite in gabbro rock of Datan is low, but the grain size is coarse and mineral composition is simple.

关 键 词：辉长岩 岩体特征 矿化特征 钛铁矿 大滩 

分 类 号：P618.31[天文地球—矿床学] P618.47[天文地球—地质学]