河南省南召县老庄透辉石–透闪石矿床地质特征及其成因分析  

Geological Characteristics and Genetic Analysis of Diopside–Tremolite Deposit in Laozhuang,Nanzhao County,Henan Province

作　　者：姬果 张筝[3] 李宁 钟江文[3] 姬清海[3] 桂新星 武慧智[3] JI Guo;ZHANG Zheng;LI Ning;ZHONG Jiangwen;JI Qinghai;GUI Xinxing;WU Huizhi(Henan Institute of Geological Sciences,Zhengzhou 450001,Henan,China;Henan Provincial Key Laboratory of Metallogenic Geological Processes and Resource Utilization of Metal Minerals,Zhengzhou 450001,Henan,China;Henan Institute of Geological Survey,Zhengzhou 450001,Henan,China;Aero Geophysical Survey and Remote Sensing Center of Henan Province,Zhengzhou 450001,Henan,China)

机构地区：[1]河南省地质科学研究所,河南郑州450001 [2]河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450001 [3]河南省地质调查院,河南郑州450001 [4]河南省航空物探遥感中心,河南郑州450001

出　　处：《西北地质》2023年第2期203-212,共10页Northwestern Geology

基　　金：中国地质调查局项目“河南省矿产资源调查成果综合集成与服务产品开发(中国矿产地质志·河南卷)”(DD20190379);河南省2018年度省财政地质勘查项目“河南省非金属矿勘查成果集成(调查)”联合资助。

摘　　要：南召县老庄透辉石–透闪石矿是河南省唯一的透辉石–透闪石矿床。矿区位于区域性栾川–明港大断裂的北侧,大地构造位置处于华北陆块南缘。矿区有2个透辉石–透闪石矿体,呈似层状赋存于青白口系栾川群南泥湖组上段中,矿体形态简单。围岩蚀变为透闪石化和透辉石化,次为钾长石化和金云母化等。矿石自然类型主要为金云母透辉石透闪石矽卡岩型、金云母透闪石透辉石矽卡岩型和金云母透闪石矽卡岩型。矿物成分主要为透闪石和透辉石,次为钾长石和金云母,方解石少量。矿石化学成分主要为SiO_(2)、CaO、MgO和Al_(2)O_(3),其次是FeO、K_(2)O、Na_(2)O和CO_(2)等。透闪石+透辉石(Tl+Di)品位较高、较稳定,矿床平均品位(Tl+Di)为68.25%。透辉石–透闪石原矿代替硅灰石用于生产釉面砖。初步试验表明,制品性能稳定,节能效果明显。矿床属矽卡岩型矿床,成矿时代为早白垩世。矿床形成受早白垩世竹园石英正长斑岩体与南泥湖组上段中的白云石大理岩及层间破碎带的多重控制。矽卡岩期为主成矿期,干矽卡岩阶段形成透辉石,湿矽卡岩阶段形成透闪石,氧化阶段形成钾长石、金云母和方解石等。Laozhuang diopside–tremolite deposit in Nanzhao county is the only diopside–tremolite deposit in Henan Province.The mining area is located in the north of Luanchuan–Minggang regional fault,and the tectonic position is in the south margin of North China block.There are two diopside–tremolit eorebodies in the mining area,which occur in the upper part of Nannihu formation of Luanchuan group of Qingbaikou system in stratoid form.The orebody morphology is simple.The wall rock alteration are mainly tremolite and diopside,followed by potassic feldspar and phlogopitization.The natural types of ores are mainly phlogopite diopside skarn,phlogopite diopside skarn and phlogopite diopsides karn.The mineral composition is mainly tremolite and diop-side,followed by potash feldspar and phlogopite,a small amount of calcite.The chemical composition of the ore are SiO2,CaO,MgO and Al2O3,followed by FeO,K2O,Na2O and CO2.Ore grade:tremolite+diopside(Tl+Di)is relatively high and stable,and the average ore grade(Tl+Di)is 68.25%.The preliminary test of diopside raw ore replacing wollastonite in the production of glazed tile shows that the product has stable performance and ob-vious energy saving effect.The deposit belongs to skarn type and the metallogenic epoch is early Cretaceous.The formation of the deposit is controlled by early Cretaceous Zhuyuan quartz syenite porphyry,dolomite mar-ble in the upper Nannihu formation and interlayer fracture zone.Skarn stage is the main metallogenic stage.Diopside is formed in dry skarn stage,tremolite is formed in wet skarn stage,and potash feldspar,phlogopite and calcite are formed in oxidation stage.

关 键 词：透辉石–透闪石 矿床地质 成因 南召 

分 类 号：P619.239[天文地球—矿床学] P611.1[天文地球—地质学]