摘要
1220铀矿田分布于中生代后地台构造-岩浆活化带中1220破火山口周围。成矿过程中有三期热液活动和两期矿化作用。第一期是碱交代型矿他,第二期是萤石-水云母型矿化。将沥青铀矿的^(238)U/^(204)Pb—^(206)Pb/^(204)Pb等时年龄作为成矿年龄,它略低于火山活动年龄。通过氧、碳、硫、铅和锶同位素研究,对成矿溶液来源及演化、成矿过程和成矿物质来源等问题进行了探讨,得出了成矿溶液由岩浆水和大气降水混合组成,成矿物质主要来源于火山岩浆的结论。
Uranium ore-field No.1220 is located about the No.1220 caldera. Three times of hydrothermal activities and two phases of mineralizations have been rocognized in the deposit. The first phase was alkalinic metasomatic type mineralization and the second was fluorite-hydromuscovite type mineralization. The ^(238)U/^(204)Pb—^(206)pb/^(204)Pb isochronic ages of pitchblendes are used as the mineralization age and are a little younger than the age of the volcanic activity, The source and evolution of the ore-forming solution, the mineralization process and the source of mineralization materials are discussed based on isotopic studies of carbon, oxygen, sulfur, lead and strontium, which leads to the conclusion that the ore-forming solution was the mixture of magmatic water and meteoric water and the mineralization materials were mainly derived from the volcanic magma.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1990年第1期69-77,共9页
Geotectonica et Metallogenia
基金
国家自然科学基金
关键词
铀矿田
同位素
地球化学
矿床
成因
Isotopic geochemistry
sources of ore-forming solution and mineralization materials
uranium deposit.
