| 毛洋头火山岩铀（银、钼）矿床的控矿因素及成因 |
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| 引用本文： | 陈迪云.毛洋头火山岩铀（银、钼）矿床的控矿因素及成因[J].矿床地质,1997,16(2):139-150. |
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| 作者姓名： | 陈迪云 |
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| 作者单位： | 中国科学院广州地球化学研究所 |
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| 摘 要： | 毛尖头铀矿床，是产于早白垩世晚期火山中的火山岩型矿床。基底构造和岩浆活化对矿床的形成起明显的控制作用，研究认为，该矿床成矿热液早期为岩浆水，晚期为大气降水；成矿元素Ｕ，Ａｇ，Ｍｏ有不同来源；其中早期矿化热液中的铀主要来自次火山热液或次火山岩，而晚期成矿热液的铀主要来自基底岩石；
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| 关 键 词： | 火山岩 铀矿床 控矿因素 成因 银 钼 |
Ore-control factors and genesis of the Maoyangtou volcanogenic uranium (silver, molybdenum) deposit |
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| Chen Diyun.Ore-control factors and genesis of the Maoyangtou volcanogenic uranium (silver, molybdenum) deposit[J].Mineral Deposits,1997,16(2):139-150. |
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| Authors: | Chen Diyun |
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| Abstract: | The Maoyangtou deposit, a large size volcano hydrothermal uranium deposit associated with silver and molybdenum mineralization, is located in the Early Cretaceous crater controlled by the arcuate faulted zone on the northwestern margin of Fuluoshan volcanic basin at the northern end of the Wuyishan uranium metallogenic belt. The ore deposit occurs where the basement rock and the upper mantle are uplifted, with the regional NE and NEE trending faults controlling the distribution of the ore bearing volcanic basin whereas the intersections of NE trending faults with NW trending faults conditioning the development of orebodies . The basement Gaoxi granite of the basin does not contain much uranium, but the proportion of active uranium in it is quite high. Especially during the alteration, the proportion of active uranium increased, and large quantities of uranium were lost. Through migmatization, uranium content of basement metamorphic rocks in this area was raised, accompanied by the formation of lots of uranium occurrences as well as mineralized spots. Volcanic rocks in the ore bearing volcanic basin are divided into Changlin Formation and Nanyuan Formation. After the principal volcanic cycle, the crater was choked up due to the collapse of the volcano, and the ascending fluids characterized by high temperature, high pressure and rich volatiles would cause crypoexplosion in a low pressure environment. In this process, rhyolite was shattered, forming host space and a pathway for hydrothermal ore forming solutions. According to geological characteristics and isotope geochemistry of the ore deposit, it is thought that the hydrothermal ore forming solutions were mainly subvolcanic hydrothermal fluids at the early stage and meteoric water at the late stage. Uranium was mainly derived from subvolcanic rocks or subvolcanic hydrothermal solution at the early stage mineralization , and from basement rocks, especially from Gaoxi biotite granite, at the late stage mineralization. Silver came chiefly from metamorphic migmatite, whereas molybdenum from subvolcanic rocks or subvolcanic hydrothermal solution. |
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| Keywords: | ore control factor genetic model Maoyangtou volcanic rock |
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