| 陕西北秦岭地区构造作用与成矿初探 |
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| 引用本文： | 戴文晗.陕西北秦岭地区构造作用与成矿初探[J].铀矿地质,1985(4). |
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| 作者姓名： | 戴文晗 |
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| 摘 要： | 陕西北秦岭地区具有多旋回构造发展史及多旋四成矿作用。主要表现:断裂构造作用的多期性,板块多次俯冲碰撞,构造带多次由北向南迁移以及多期次岩浆活动和变质作用等方面。其结果使得该区显示出由北向南的构造发展规律,并形成了最终的构造格局。根据该区多旋回的构造发展历史,可将该区铀及其有关矿产分为五个矿化旋回期:太古代,元古代、早古生代、晚古-中生代和新生代。其中早古生代、晚古-中生代和新生代,是区内三个主要矿化旋回期。深大断裂带系统在成岩成矿中占有相当重要的地位,它们不但控制了区内内生矿化的形成,而且是控制变质怍用与矿化的重要因素。断裂作用破坏了地壳岩石的完整性,使处于封闭状态的铀及其它成矿元素得以活化转移,从而形成了矿化作用的有利条件。燕山-喜山期构造和岩浆活化作用,对原有地质构造和矿化进行了强烈的改造。形成了新的矿化排列组合及新类型矿化。铀矿化则以淋积型为主。该区有利的找矿方向是:地台边缘冒地槽区,深大断裂带通过富铀建造的地区,北东向隆起一沉降过渡区。
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| 关 键 词： | 多旋回构造作用 矿化 断裂带 后期改造 |
A PRELIMINARY INVESTIGATION ON TECTONISM AND METALLOGENESIS IN THE NORTH QINLING REGION, SHANXI PROVINCE |
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| Dai Wenhan.A PRELIMINARY INVESTIGATION ON TECTONISM AND METALLOGENESIS IN THE NORTH QINLING REGION, SHANXI PROVINCE[J].Uranium Geology,1985(4). |
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| Authors: | Dai Wenhan |
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| Abstract: | A history of multicyclic tectonic development and multicyclic metallogenesis occur in the North Qinling region, Shanxi Province. They are mainly represented as multistage fracturing tectonism,multiple plate subduction and collision, multiple movement for the tectonic zone from north to south, and multistage magmatism and metamorphism. As a result, tectonism of the region was regularly developed from north to south and then a finalectonic framework was formed in the region. According to the history of multicyclic tectonic development, there exist five ore-forming cycles including uranium mineralization. Original geological and other mineral resources, i. e. Archean, Proterozoic, Lower Palaeozoic, Upper Palaeozoic-Mesozoic and Cenozoic. Among them Lower Palaeozoic, Mesozoic and Cenozoic are three main ore-forming cycles in the the region. Deep fault systems have played a very important part in diagenesis and ore formation. They have not only controlled the formation of the endogenic mineralization, but also acted as important factors controlling metamorphism and mineralization. Fracturing destroyed the completeness of crustal rocks, and caused the confined uranium and other metals to have been mobilized and migrated, thereby forming a favourable condition for uranium mineralization. Original geological structures and mineralization were intensely reworked by the Yeashanian-Himalayan tectonic and magmatic mobilization. As a result, new types and association of mineralization were formed. Uranium mineralization is mainly related to leaching type. The favourable prospecting criteria in the region are considered to be miogeosyncline environment near the margin of platform, the deep-fault zones passing through the area with uranium-rich formation, as well as transitional uplift-subsidence zones of NE-frending. |
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| Keywords: | Multicyclic tectonism Mineralization Fracture zone Late reworking |
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