黑龙江省萝北县四方山林场东部晶质石墨矿床地质特征及成矿规律探析

四方山林场东部晶质石墨矿床位于萝北石墨矿化集中区，是近年在佳木斯(地块)石墨成矿带北缘发现的一大型晶质石墨矿床。本文从矿床角度出发，立足于本区地质勘查资料，结合前人研究成果，在对四方山林场东部晶质石墨矿床区域地质背景及矿床地质特征研究的基础上，对成矿规律进行了初步探讨，并归纳总结了区域找矿标志。研究表明，该区矿体分布集中，主要呈似层状、透镜状；品位变化均匀，厚度变化较稳定；伴生有益有害元素含量低；矿石自然类型为石墨片岩型，工业类型为鳞片状晶质石墨；矿石易选，以大鳞片为主；矿床成因类型为沉积变质型，石墨中的碳来源于生物有机质，成矿时代为古元古代—早古生代；具有层控及构造控矿的基本特征。研究结果对佳木斯(地块)石墨成矿带北缘成矿规律研究及总结起到至关重要的作用，对区域同类矿产找矿工作也有一定的指导意义。

Geological characteristics and metallogenic regularity of crystalline graphite deposit in the east of Sifangshan linchang, Luobei County, Heilongjiang Province

The crystalline graphite deposit in the east of Sifangshan Linchang is located in the concentration area of graphite mineralization in Luobei. It is a large crystalline graphite deposit found in the north edge of the Jiamusi (massif) graphite metallogenic belt in recent years. From the perspective of ore deposits, based on the geological exploration data in this area, combined with previous research results, on the basis of the research on the regional geological background, geological characteristics of the mining area and geological characteristics of the deposit in the east of Sifang Mountain Forest Farm, this paper preliminarily discusses the metallogenic regularity, and summarizes the regional prospecting indicators. The study shows that the ore bodies in this area are concentrated, mainly in the form of lamellar and lenticular; The grade change is uniform and the thickness change is relatively stable; The content of associated beneficial and harmful elements is low; The natural type of ore is graphite schist, and the industrial type is flake crystalline graphite; The ore is easy to separate, mainly with large scales; The genetic type of the deposit is sedimentary metamorphic type, the carbon in the graphite comes from biological organic matter, and the mineralization age is from Paleoproterozoic to Early Paleozoic; It has the basic characteristics of stratabound and tectonic ore control. The research results play an important role in the study and summary of the mineralization law in the northern margin of the Jiamusi (massif) graphite metallogenic belt, and also have a certain guiding significance for the regional prospecting of similar minerals.