共查询到19条相似文献,搜索用时 421 毫秒
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现代成矿规律学的基本问题 总被引:2,自引:0,他引:2
文章扼要论述了主要大地构造单元--地台,褶被带和活化区的成矿规律,并以俄罗斯领土为例,分析了岩石圈深部结构与成矿作用的关系,讨论了成矿作用在地质历史中的演化。 相似文献
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秦岭地区(北纬32℃—35℃)横亘我国中部,地处中朝准地台、扬子准地台两个相对稳定的地质单元之间,为长江、黄河两大水系的分水岭,形成了我国南、北气候的天然分界。这里所谓扬子准地台应包括摩天岭台隆、若尔盖中间地块,后两者是从前者边缘分离出来的。秦岭地区古褶皱形态即是其本身构造运动的产物,又反映了中朝准地台、扬子准地台两者的相对运动。因此对南秦岭冒地槽褶皱带(以下简称秦岭南带)晚加里东构造运动的研究,不仅能够揭示其运动性质、波及范围、形态特征及对其褶皱后古地形地貌的 相似文献
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铝土矿矿床中稀土、铌(钽)元素的地球化学行为 总被引:2,自引:0,他引:2
铝土矿中稀土、铌(钽)元素的地球化学性状,早就引起了人们的兴趣,本文根据多年的研究资料,对此进行初步探讨。矿床地质特征我国的铝土矿矿床多分布于东部准地台范围内。从大地构造单元看,主要分布在中朝准地台、 相似文献
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该区位于扬子准地台的Ⅳ级构造单元武陵坳陷断裂东南缘,湘西北弧形构造弯转地段,鄂湘黔隐伏岩石圈断裂边缘。本文阐述了沙塔坪萤石矿床地质特征后,结合区域地质背景、矿床地质特征,分析了成矿地质条件,并对其找矿标志进行了探讨。 相似文献
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青藏高原西部重力异常剖面拟合及其地质解释 总被引:2,自引:0,他引:2
在青藏高原西部地区沿东经80°和83°选择了2条剖面,在地质资料、物性资料和布格重力异常、航磁异常研究的基础上,结合深部地球物理, 建立了剖面的地质-地球物理模型。通过重力联合人机交互正演模拟,求解地下地质体的模型,并依此对剖面通过地段的地壳结构、断裂带深部特征和构造单元的深部格架进行了解释推断。 相似文献
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西秦岭地质构造的初步分析及构造带的划分 总被引:2,自引:0,他引:2
西秦岭地处我国中心,在地质构造位置上为我国南北地台(华北准地台与扬子准地台)分野——秦岭褶皱系的西端;同时,又为我国南北地震带经过处。在构造上颇受国内各地质学者的注意。历来各地质学者对西秦岭的地质问题提出了多种观点与解释。无疑,对探讨西秦岭地质真实面貌是十分有意义的。但地质历史是复杂的,要使认识符合于客观的真实,必须反复地去认识,用多种方法去探讨。本文在学习板块学说中,试对西秦岭的地质构造进行初步分析并对其构造带划分进行尝试性探讨。但由于笔者学识肤浅,囿于管见,不妥之处 相似文献
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Abstract The Shangdan fault in the Qinling Orogenic Belt of China is an important boundary between the Caledonian North Qinling Fold Belt and the Hercynian South Qinling Fold Belt. In the Danfeng area, the fault zone strikes WNW–ESE and comprises four strongly deformed zones and three weakly deformed domains parallel to each other. The fault zone has a complex history of multiple deformation and each domain has a different tectonic style that was formed at different stages of the deformation.
The rocks exposed in the weakly deformed domains belong to the Qinling, Danfeng and Liuling Groups. In this paper, the mineral chemistry and mineral assemblages are used to infer the metamorphic conditions and the P–T paths of these units. The metamorphic units in and near the fault zone have different metamorphic conditions and histories that are correlated with the tectonic evolution of the fault zone. Caledonian–Hercynian uplift and southward thrusting of the Proterozoic Qinling Group, over the Danfeng and the Liuling Groups, produced the main metamorphic and tectonic features of the fault zone. Folding of both the Liuling Group and the thrust faults during the Hercynian–Indosinian was accompanied by northward thrusting. 相似文献
The rocks exposed in the weakly deformed domains belong to the Qinling, Danfeng and Liuling Groups. In this paper, the mineral chemistry and mineral assemblages are used to infer the metamorphic conditions and the P–T paths of these units. The metamorphic units in and near the fault zone have different metamorphic conditions and histories that are correlated with the tectonic evolution of the fault zone. Caledonian–Hercynian uplift and southward thrusting of the Proterozoic Qinling Group, over the Danfeng and the Liuling Groups, produced the main metamorphic and tectonic features of the fault zone. Folding of both the Liuling Group and the thrust faults during the Hercynian–Indosinian was accompanied by northward thrusting. 相似文献
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秦岭造山带新生代构造隆升与区域环境效应研究 总被引:16,自引:0,他引:16
据沉积,构造、地貌并结合地球物理资料综合研究认为,秦岭造山带新生代构造隆升是在中生代白垩纪晚期构造隆升基础上,于晚第三纪中新世迅速隆升,而早更新世早期则是新构造活动最强烈时期。秦岭造山带的新生代构造隆升的方式主要有地垒式、掀斜式、振荡式和翘板式4种。诱发这一地区新构造抬升的主要原因和动力学机制是华北地块自北而南,扬子地块自南而北相向向秦岭造山带之下陆内俯冲和秦岭地块深部软流圈抬升共同作用所致。 相似文献
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秦岭造山带基本组成与结构及其构造演化 总被引:51,自引:7,他引:51
秦岭造山带主要由三大套构造岩石地层单元组成,经历了三个主要演化阶段:1.前寒武纪古老基底形成演化阶段,2.主造山期(Pt3—T2)板块构造演化阶段,3.中新生代陆内构造演化阶段。在早中元古代以扩张构造体制占主导,形成裂谷与小洋盆兼杂并存的基本构造格局,经10—8亿年晋宁期从扩张垂向加积增生构造体制为主向以侧向增生为主的板块构造体制的过渡,于晚元古代中晚期开始进入板块构造演化阶段。在晚古生代早期由于东古特提斯洋的形成,扬子板块北缘沿秦岭南部扩张打开,形成华北板块、扬子板块及其间的秦岭微板块,沿商丹和勉略二缝合带自南向北俯冲消减碰撞,于中三叠世最后全面陆陆碰撞造山,而后又发生了强烈陆内造山作用,终成今日之秦岭山脉面貌。现今的秦岭造山带岩石圈结构是一正在调整演化中的具流变学分层的“立交桥式”三维结构,上部地壳呈多层逆冲推覆迭置的不对称扇形几何学模式,岩石圈中部则是成水平状流变层,而深部地幔则是最新调整的近南北向的地球物理异常状态与结构,形成从下到上构造方向近乎正交的圈层非耦合关系。 相似文献
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《Russian Geology and Geophysics》2007,48(2):199-203
We discuss main tectonic features of the Little Qinling gold belt in Central China, located along the northern border of the eastern Qinling E-W tectonic zone, which hosts hydrothermal lode gold deposits. The distribution of deposits and the strike of ore bodies are controlled by the Dayueping-Jinluoban anticlinorium and the related faults, namely large ductile-shear faults on its flanks striking parallel to the uplift axis and some large faults in the north and south. Mineralization is associated with smaller-scale mylonite zones of brittle-ductile deformation. The Dayueping-Jinluoban dome went through several stages of tectonic evolution (compression → folding → doming → strike-slip faulting → extensional faulting → reshearing) accompanied by regional deformation, metamorphism, migmatizition and mineralization. 相似文献