| 凡河元古宙坳拉谷关门山铅锌矿床铅同位素研究 |
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| 引用本文： | 张国武.凡河元古宙坳拉谷关门山铅锌矿床铅同位素研究[J].国土资源,1993(1). |
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| 作者姓名： | 张国武 |
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| 作者单位： | 辽宁省地质矿产局第九地质大队 铁岭 |
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| 摘 要： | 凡河元古宙坳拉谷关门山铅锌矿床及外围铅矿点,矿石中的铅是以正常铅为主,单阶段模式年龄为1807—1995Ma,铅质来源主要是造山带铅,铅源岩为大于2000Ma的太古宙结晶基底。矿石中异常铅具有线性关系,它是由矿石中的正常铅与放射成因铀铅组成的。结合地质观察认为1807—1995Ma是正常铅受到均一化时间,不是成矿时间。该时间大于容矿条带状白云岩的年龄1526—1600Ma。矿体受断裂构造控制,具有穿层性,矿体生成于容矿岩石成岩以后。矿床成因是属后生的。成矿时间(主矿化期)为1400—1500Ma左右,最晚矿化时间为294Ma。矿床成因属元古宙坳拉谷碳酸盐岩密西西比河谷型(MVT)后生铅锌矿床。
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| 关 键 词： | 凡河 铅同位素 铅质来源 成矿时间 |
STUDIES ON THE LEAD ISOTOPES FROM GUANMENSHAN Pb-Zn DEPOSITS IN PROTEROZOIC AULACOGEN AT FANHE AREA |
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| Zhang Guowu.STUDIES ON THE LEAD ISOTOPES FROM GUANMENSHAN Pb-Zn DEPOSITS IN PROTEROZOIC AULACOGEN AT FANHE AREA[J].Land & Resources,1993(1). |
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| Authors: | Zhang Guowu |
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| Abstract: | The lead element of the ores from Guanmenshan Pb-Zn deposits is mainly normal lead which single-stage model age is 1807-1995 Ma.The lead source was from orogenic belt.Its source rock is Archaeazoic crystall basement,>2000Ma.The anomalous lead of the ores has linear relation, which is composed of normal lead and radiogenic uranium-lead.In the light of field observation,1807-1995Ma is considered to be the time of normal lead homogenization,not of ore-forming,because the time is more earlier than the age of host rock-banded dolomite,1526-1600Ma.A orebody was controlled by fault structures and formed after the host rock diagenesis.So the oreforming age(principal mineralization age)is about 1400-1500Ma,the latest time is 294Ma.The deposit is Mississippi valley-type epigenetic Pb-Zn deposit of Proterozoic aulacogen carbonate rock. |
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| Keywords: | Fanhe Lead isotope Lead source Ore-forming time |
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