| 中国的岩金矿床与板块构造 |
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| 引用本文： | 刘肇昌.中国的岩金矿床与板块构造[J].现代地质,1989(3). |
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| 作者姓名： | 刘肇昌 |
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| 作者单位： | 中国有色金属工业总公司成都地质干部学院 |
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| 摘 要： | 本文指出,中国岩金矿床的形成和分布严格地受板块构造控制。(1)裂谷带和俯冲、碰撞带等不同构造环境金的成矿特征明显不同。俯冲带金矿床还具有水平分带性,它受富金变质基底和深断裂的影响而复杂化;(2)不同构造环境金的成矿作用,既有区别,又有联系,在威尔逊构造旋回中为一连续过程,在成矿作用、矿床类型、矿质来源、矿石金属元素组合等方面均具有旋回性;(3)吕梁期和燕山期是我国最重要的金成矿期,是分别伴随太古代绿岩-裂谷带封闭和大规模俯冲、碰撞作用而发生的。在太古代绿岩带之上叠加有燕山期俯冲构造的地区,是我国最重要的金成矿集中区。
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| 关 键 词： | 中国 岩金矿床 板块构造 裂谷带 俯冲带 碰撞带 威尔逊构造旋回 |
ROCK-GOLD DEPOSITS AND PLATE TECTONICS IN CHINA |
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| Liu Zhaochang.ROCK-GOLD DEPOSITS AND PLATE TECTONICS IN CHINA[J].Geoscience——Journal of Graduate School,China University of Geosciences,1989(3). |
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| Authors: | Liu Zhaochang |
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| Abstract: | This paper aims to make an approach for the relation between the formation and distribution of gold deposits and plate tectonism in China.
First, various plate tectonic setting have different metallogenetic features of the gold deposits, the gold metallogenesis was mainly controlled by the plate tectonism.
In the rift-vally zones of China, the formatinn of the gold ores were directly or indirectly related to typical huge basic magmation from mantle under rifting. Generally speaking the associated-gold ores and gold-rich sediments were mainly formed at the rifting stage, while the great economic independent-gold deposits were formed at late close stage of rift.
In the subduction zones of China, the gold metallogenesis were mainly related to intermediate-acidic magmation of different sources; and the regional deform ation-metamorphism. The sources of metals include crust and/or mantle, and the presence of gold-rich meta-basement Complex are the necessary conditions for the formation of many large-scale gold deposits. ?
The distribution of gold deposits types in subduction zones of China showed a clear horizontal zonation, and the Mesozoic active continental margin was more complex than pre-Mesozoic inter-oceanic island arc-trench systems for the zonation. The occurrence of second metallogenetic belts had been controlled by the occur rence of gold-rich meta-basement complex and great fracture, which made the patterns of metallogenetic zones complicated.Mesozoic magmatic arc and back-arc magmatic belts were the most important of the gold deposits of subduction?related in China.
The collision-related gold metallogenesis was closely related to the regional deformation-metamorphism. The formation of gold deposits in later close stage of rift elementally resulted from the collision between terrains on both sides of the rift.
Second, the gold metallogenesis of distinct plate tectonic settings were close related to each other. During the Wilson tectonic cycle, the metallogenesis of gold deposit appeared as a continuous process, and a cyclicity for the types of deposit, source of metal and associated major metal element, etc.
Third, the metallogcnctic epoch of gold deposits in China were predominant in the Luliang period at the end of early proterozoics and the Yanshanian period of the Jurassic to Cretaceous era. The former was just the close period of the Archeaen-early Proterozoic greenstone-rifts and the formation of China-Korea craton, the latter was just the period of large-scale subduction and collision in China.The gold-rich central nietalloprovinces formed in the localities where the Mesozoic subducted and collided tectonics were superimposed on the Archnean-early Proterozoic greenston-rift belts. |
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| Keywords: | : China rock-gold deposits plate tectonics rift-vally zones sub-duction zones collision zones Wilson tectonic cycle |
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