Geological Characteristics and Current Research Status of Xiaosigou Porphyry Copper(Molybdenum)Deposit in Pingquan,Eastern Hebei Province
Xiaosigou porphyry copper(molybdenum)deposit is the most representative medium-sized porphyry-skarn metallogenic system in Eastern Hebei province,and it is also an important copper ore production base in Hebei province after Shouwangfen copper deposit.The mining area is located in the triangle of the intersection of regional east-west and north-east trending large fault structures,and the north-west-trending structure is the main ore control structure.The Xiaosigou rock mass,which is composed of granite porphyry,granodiorite porphyry and quartz diorite porphyry,is the main ore-controlling rock mass.Copper(molybdenum)ore is mainly developed in the inner and outer contact zone in the northeast corner of Xiaosigou rock mass,and has the metallogenic zonality of"inner molybdenum and outer copper".It is believed that the initial magma of Xiaosigou rock mass is mainly a partial melting product of the thickened lower crust,and some mantle materials may be added to the initial magma.The Xiaosigou rock mass was formed between 111～129 Ma.The uniform temperature of ore-forming fluids is relatively concentrated in the range of 320℃～360℃,and the ore deposits are formed under the conditions of high salinity and medium high temperature.Through the study of sulfur isotopes,different scholars have shown that the sulfur source of the Xiaosigou copper-molybdenum deposit comes from magma.Based on previous studies,it is believed that the genesis of Xiaosigou deposit can be attributed to the skarn-copper—porphyry-molybdenum composite genetic deposit type.The previous research work on the Xiaosigou copper mine was mainly concentrated in the last century,and the current scientific research on the Xiaosigou copper deposit is not sufficient,and the scientific problems faced are very prominent,especially the spatiotemporal relationship between the compound rock mass and different intrusions and its genetic relationship with copper and molybdenum mineralization is still unclear.There is still a lack of systematic comparative research on the Xiaosigou copper mine and many mineralization points in the surrounding periphery,and the lack of understanding and research restricts the smooth development of the deep and peripheral prospecting work of the copper mineralization concentration area in the Shouwangfen-Xiaosigou area to a certain extent.
Pingquan of Eastern HebeiXiaosigouporphyry copper(molybdenum)oregeological characteristicsresearch status
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