| 显生宙脉型铀矿床成矿理论的几个基本问题 |
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| 引用本文： | 陈肇博.显生宙脉型铀矿床成矿理论的几个基本问题[J].铀矿地质,1985(1). |
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| 作者姓名： | 陈肇博 |
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| 摘 要： | 显生宙铀矿地质的一个重要特征就是大量脉型铀矿床(或称热液铀矿床)的发育。本文以中国显生宙脉型铀矿床的研究成果为基础,综合西欧、中欧、苏联和美国同类矿床的资料,概要地阐述了这类矿床的基本地质和地球化学特征,讨论和评述了其成矿理论的几个基本问题。根据对世界主要铀矿区的大地构造背景分析,提出区域性铀源主要来自褶皱带的中心地块和活动大陆边缘基底古老硅铝壳中的富铀地质体,铀的活化和向上部构造层转移的主要因素是深熔作用和酸性岩浆怍用。显生宙热液铀成矿省形成的可能原因在于遭受深熔的部位存在着足够多的富铀地质体。提出了成矿热液形成的可能机制和“双混合”成因模式。强调指出拉张型构造运动和裂陷作用对脉型铀矿床形成的重要作用。
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| 关 键 词： | 显生宙 脉型铀矿床 铀矿成因模式 深熔作用 裂陷作用 板块构造 |
SOME BASIC METALLOGENETIC ASPECTS ON PHANEROZOIC VEIN-TYPE URANIUM DEPOSITS |
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| Chen Zhaobo.SOME BASIC METALLOGENETIC ASPECTS ON PHANEROZOIC VEIN-TYPE URANIUM DEPOSITS[J].Uranium Geology,1985(1). |
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| Authors: | Chen Zhaobo |
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| Institution: | Chen Zhaobo |
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| Abstract: | One of the features of Phanerozoic uranium geology is the vast developmen of vein-type (hydrothermal) uranium deposits. The article is aimed at the tentative elucidation of their geological and geochemical characteristics and discussion on some basic metallogenetic problems on the basis of the comprehensive data obtained mainly from Chinese Phanerozoic vein-type uranium deposits, as well as the same type deposits in Western and Middle Europe, USSR and USA. According to the analysis of geotectonic setting of different regions where many Phanerozoic vein-type uranium deposits occur it is supposed that the regional source of uranium was derired from uraniferous terranes in ancient sialic basement of active continental margins and median masses in geosyneline folded zones. The anatexis and acid magmatism are the main factors for the remobilization and migration of uranium toward upper structural levels. The possible reason for the formation of metallogenic province is the existence of enough amount of uraniferous terranesat the portion of sial which underwent anatexis. The possible origin of ore-forming solutions and the "Double Mixing" genetic model are suggested. The importance of tensional tectonics and taphrogeny for the formation of vein-type uranium deposits is emphasized. |
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| Keywords: | Phanerozoic eon Vein-type uranium deposits Genetic model of uranium deposits Anatexis Taphrogeny Plate tectonics |
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