豫西火神庙石英闪长岩的矿物学特征及其意义  

Mineralogy characteristic of the Huoshenmiao quartz diorite in western Henan Province and its implications

作　　者：王赛 叶会寿[3] 杨永强[4] 张兴康 王鹏[4] 抄尉尉 WANG Sai;YE Huishou;YANG Yongqiang;ZHANG Xingkang;WANG Peng;Chao Weiwei(Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,Ministry of Natural Resources,Qingdao,Shandong,266061;Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology (Qingdao),Qingdao,Shandong,266061;MLR Key Laboratory of Metallogeny andMineral Assessment,Institute of Mineral Resources,CAGS,Beijing,100037;China University of Geosciences,School of Earth Science and Resources,Beijing,100083;Hebei Institute of Geological Survey,Shijiazhuang,Hebei,050081)

机构地区：[1]自然资源部第一海洋研究所,海洋沉积与环境地质自然资源部重点实验室,山东青岛266061 [2]青岛海洋科学与技术试点国家实验室海洋地质过程与功能实验室,山东青岛266061 [3]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037 [4]中国地质大学(北京)地球科学与资源学院,北京100083 [5]河北省地质调查院,河北石家庄050081

出　　处：《地质学报》2019年第9期2292-2307,共16页Acta Geologica Sinica

基　　金：国家科技支撑计划项目（编号2011BAB04B06）;自然资源部海底矿产资源重点实验室开放基金（编号KLMMR-2018-B-10）;中国大洋协会“十三五”重大项目（编号DY135-S2-2、DY135-S2-2-01）资助成果

摘　　要：火神庙岩体位于华北陆块南缘栾川矿集区西部,为一杂岩体,主要由石英闪长岩、二长花岗岩和花岗斑岩组成,其中石英闪长岩出露于边部,构成了岩体的主体。为准确厘定石英闪长岩的形成过程以及形成的物理化学条件,并为进一步确定火神庙钼矿床成因提供依据,对主要造岩矿物(斜长石、钾长石、角闪石和黑云母)成分进行了详细的研究。结果显示石英闪长岩中的斜长石主要为中长石,可分为"正环带"斜长石、"反环带"斜长石和"韵律环带"斜长石;钾长石为正长石;角闪石为镁角闪石;黑云母属于原生镁质-铁质黑云母。石英闪长岩形成过程中岩浆经历了多期演化:早期岩浆稳定结晶,结晶出An=30~35的斜长石;中期岩浆含水量增加,斜长石An值显著升高,An=39~42;晚期岩浆稳定结晶、含水量降低,结晶出An=42~28的斜长石。岩浆结晶温度为798~830℃、结晶压力上限为198~242MPa、氧逸度为-14^-13。镁铁质岩浆较高的氧逸度、温度及Cl含量与火神庙钼矿床的形成密切相关。The Huoshenmiao intrusion, which is located in the western section of the Luanchuan ore cluster district, southern margin of the North China Craton(NCC), comprises quartz diorite, monzo-granite and granite porphyry. The quartz diorite distributed mainly in the periphery is the main part of the intrusion. Four major rock-forming minerals including plagioclase, K-feldspar, amphibole and biotite were analyzed using electron microprobe to constrain the formation process and physicochemical conditions of the quartz diorite, and to reveal the genesis of the Huoshenmiao Mo deposit. Mineralogical study shows that plagioclase belongs to andesine, which can be divided into three types including normally zoned, reverse zoned and oscillatory zoned;K-feldspar is orthoclase;amphibole is magnesium amphibole;and biotite belong to magnesium biotite and iron biotite. The formation process of quartz diorite experienced multiple-stage magma evolution: the early stage of magma evolution, at which plagioclase was crystallized with An=30~35;the middle stage, at which increased water content in magma gave rise to the formation of plagioclase with An=39~42;the late stage, at which magma with less water was stabely crystallized to form plagioclase with An=42~28. The quartz diorite formed under the conditions of high-temperature(798℃ to 830℃), high-pressure(198~242 MPa) and high-oxygen fugacity(-14^-13). Therefore, the high oxygen fugacity, temperature and Cl contents of mafic magma are directly related to the formation of the Huoshenmiao Mo deposit.

关 键 词：矿物学 电子探针 石英闪长岩 火神庙 豫西 

分 类 号：P588.12[天文地球—岩石学] P618.65[天文地球—地质学]