安徽省罗河铁矿床ZK2-1钻孔地质编录

Geological logging of drilling ZK2-1 in Luoheiron Deposit

庐枞盆地位于扬子板块北缘的长江断裂带内,是长江中下游多金属成矿带内重要的矿集区之一。罗河铁矿床位于庐枞盆地西缘,是20世纪60年代发现的大型磁铁矿床。矿区岩浆活动强烈,出露地层主要为白垩系下统要为下白垩统双庙组和砖桥组火山岩地层,侵入岩体主要为闪长玢岩和正长斑岩,前者为铁矿的主要成矿母岩,后者为破坏矿体的成矿期后侵入岩。矿石矿物主要为磁铁矿,其次为赤铁矿、假象赤铁矿、褐铁矿和黄铁矿。脉石矿物主要为钠长石,其次为透辉石、硬石膏、绿泥石、绿帘石、石英、碳酸盐、绢云母和高岭石等。矿石的自然类型主要为脉状,其次为浸染状。围岩蚀变发育,闪长玢岩主要发育膏辉岩化、绿泥石化、绿帘石化,与磁铁矿化关系密切,粗安岩主要发育钠长石化和硅化。在熟悉罗河铁矿床基本地质特征的基础上,选取矿区内代表性钻孔ZK2-1展开地质编录,完成钻孔编录相关成果,为矿床勘探提供原始基础资料。钻孔ZK2-1孔深645.14 m,按岩性大致分为八层:1)残坡积层;2)黑云母粗安岩;3)晶屑凝灰岩;4)高岭石化硅化粗安岩;5)硬石膏石英岩;6)细粒闪长岩;7)碱性长石岩;8)硬石膏透辉石岩。钻孔中岩心主体为粗安岩和闪长玢岩,并夹若干层磁铁矿体。

The Lu-Zong volcanic basin is an important part of the Middle-Lower YangtzeRiver Valley metallogenic belt in eastern China,The Luohe deposit is a large magnetite deposit which found in 1960s and occurs in the western of Lu-Zong basin.The host strata are andesite and tuffs of the Lower Cretaceous Shuangmiao and Zhuanqiao Formation.The ore bodies are located in the andesite and upper part of the diorite porphyry the later syenite cut across ore bodies.The ores include magnetite,martite,hematite,limonite and pyrite with a minor amount of siderite.Gangue minerals are diopside,calcite,albite,chlorite,epidote,apatite,hornblende,anhydrite and quartz.The orebody is dominated by veined and disseminated iron ore.Wall rock alteration is intense and the upper part of the diorite porphyry has been altered to diopside,chlorite,epidote,and phlogopite.This graduation design is based on basic geological information of Luohe deposits,including the formation and distribution situation,lithologic characters,mineral types and ledge（body）mode of occurrence,drape,fracture,ore belts distribution and features,mining rock ore-bearing division unit etc.Meanwhile,the relevant provisions,procedures,requirements and methods for primitive logging has been detail studied.This paper choose the representative drill holeZK2-1 to record logging.Through this design,we can provide original fundamental material for mineral deposit exploration by finishing relevant results for drilling record.The depth of drilling ZK2-1 is 645.14 and can be divided into eight sections：1）eluvial-slope wash;2）biotite andesite;3）crystal tuff;4）trachyandensite altered by silication and kaolinization;5）anhydrite and quartzite rock;6）luciite;7）alkali feldspar;8）anhydrite and diopside rock.The main part of drilling core is diorite porphyry and volcanic rock.