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河南省老湾金矿韧性剪切带特征及成矿机制探讨
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作者 陈忠诚 魏鸿 +2 位作者 喻艳丽 陈霏霏 徐刚 《世界有色金属》 2024年第16期46-50,共5页
老湾韧性剪切变质带是北秦岭古生代褶皱带与南秦岭印支褶皱带分界构造的一部分,呈NWW向展布,分为四个主应变带和两个岩片带。带内岩性分布以基性岩浆岩为主,兼有部分变质岩块体、酸性岩浆岩体和岩脉等。金矿化严格受韧性剪切变质带控制... 老湾韧性剪切变质带是北秦岭古生代褶皱带与南秦岭印支褶皱带分界构造的一部分,呈NWW向展布,分为四个主应变带和两个岩片带。带内岩性分布以基性岩浆岩为主,兼有部分变质岩块体、酸性岩浆岩体和岩脉等。金矿化严格受韧性剪切变质带控制,主要集中分布在RF4强应变域中心及两侧的Ⅱ岩片区,辉绿一辉长岩为金的矿源层,后期老湾黑云母花岗岩对含金热流体起着成分改造和加强循环的作用。矿床成矿机制复杂,泥盆纪末,南北大陆发生碰撞,基性岩浆侵入,部分Au带入岩浆→印支期,发生强烈韧性剪切变形变质,Au元素活化运移,向强应变部位富集→燕山期,老湾花岗岩岩浆的热加入,Au进一步在剪切强应变带聚积成矿。 展开更多
关键词 韧性剪切带特征 成矿机制 金矿 老湾
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元谋变质核杂岩南部韧性剪切带特征及石墨矿化
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作者 包大林 杜小波 +1 位作者 廖志凯 杨宇 《云南地质》 2024年第2期230-234,共5页
通过元谋变质核杂岩南部地质调查及钻探工作,识别出4条韧性剪切带,宏观特征有糜棱岩及糜棱岩化岩石、拉伸线理、S-C组构、尖棱褶皱等,微观特征有石英动态重结晶、旋转碎斑、不对称压力影、云母鱼及微观尖棱褶皱等。已施工钻孔数据表明... 通过元谋变质核杂岩南部地质调查及钻探工作,识别出4条韧性剪切带,宏观特征有糜棱岩及糜棱岩化岩石、拉伸线理、S-C组构、尖棱褶皱等,微观特征有石英动态重结晶、旋转碎斑、不对称压力影、云母鱼及微观尖棱褶皱等。已施工钻孔数据表明韧性剪切带范围为晶质石墨矿体良好容矿部位。 展开更多
关键词 变质核杂岩 韧性剪切带特征 石墨矿化 云南元谋.
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大兴安岭北部富克山地区中生代韧性剪切带特征及其构造意义 被引量:2
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作者 马永光 《有色矿冶》 2019年第2期1-4,共4页
研究区内的韧性剪切带呈NE向带状展布,糜棱面理走向为北东向,倾向南东,倾角较陡,具有走滑剪切的特征。岩石变形后发育较强的糜棱面理、碎斑旋转、拉伸线理等构造。研究表明,韧性剪切带形成与发展与蒙古—鄂霍次克造山带的演化有关。
关键词 剪切带特征 构造 大兴安岭
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内蒙古乌拉特前旗白云常合山金矿田付谷渠—北召沟韧性剪切带特征及其对金矿的控制作用
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作者 丁文利 《西部资源》 2013年第1期76-77,79,共3页
付谷渠一北召沟韧性剪切带位于太古界乌拉山群与元古界色尔腾群接触部,剪切带总体表现为北盘向南西移动,南盘向北东移动,上盘相对向上,下盘相对向下位移,属多期改造的韧性伸展、逆冲推覆、左行右行走滑剪切带,形成于20亿年及其以前,相... 付谷渠一北召沟韧性剪切带位于太古界乌拉山群与元古界色尔腾群接触部,剪切带总体表现为北盘向南西移动,南盘向北东移动,上盘相对向上,下盘相对向下位移,属多期改造的韧性伸展、逆冲推覆、左行右行走滑剪切带,形成于20亿年及其以前,相当于早元古时期发生的变形。韧性剪切带形成后,又经历了漫长而复杂的地史演化。矿田内的几个矿段均位于剪切带中,其分布与剪切带强度有明显的依存关系,韧剪带不仅是控岩、导矿构造,而且是金的成矿机制,为金的活化、迁移、富集提供有利的通道、空间及物化环境。 展开更多
关键词 白云常合山金矿田 韧性剪切带特征 对金矿的控制作用
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甘肃华家岭—葫芦河一带韧性剪切带的发现及其地质意义 被引量:3
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作者 张彦杰 马惠萍 张宏斌 《西北地质》 CAS CSCD 2003年第3期24-28,共5页
华家岭-葫芦河韧性剪切带呈NWW走向,属北祁连造山带与中祁连地块分界断裂,通过对其几何学、运动学、动力学等分析研究,认为峰期变形系加里东末期南北两大板块汇聚碰撞,拼合于华北板块南缘的软质陆壳(北祁连)向南侧刚性的中祁连地块斜向... 华家岭-葫芦河韧性剪切带呈NWW走向,属北祁连造山带与中祁连地块分界断裂,通过对其几何学、运动学、动力学等分析研究,认为峰期变形系加里东末期南北两大板块汇聚碰撞,拼合于华北板块南缘的软质陆壳(北祁连)向南侧刚性的中祁连地块斜向逆冲叠覆,从而产生自NEE向SWW兼右行走滑的逆冲式韧性剪切活动。 展开更多
关键词 华家岭—葫芦河 韧性剪切带特征 地质意义
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山西省娄烦县西川河韧性剪切带的特征及其地质意义
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作者 何宏 《华北国土资源》 2012年第5期51-54,共4页
通过对西川河韧性剪切带内片理、层理、褶皱、拉伸等的展布分析,研究其变形及特征,进一步探讨剪切带的变质作用,确定其确定的要素以及剪切的地质意义。
关键词 西川河韧性剪切 剪切特征 各种变形 剪切要素 地质意义
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Structural feature and its significance of the northernmost segment of the Tertiary Biluoxueshan-Chongshan shear zone,east of the Eastern Himalayan Syntaxis 被引量:11
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作者 ZHANG Bo ZHANG JinJiang +3 位作者 ZHONG DaLai WANG XiaoXian QU JunFeng GUO Lei 《Science China Earth Sciences》 SCIE EI CAS 2011年第7期959-974,共16页
Here we describe ductile, ductile-brittle and brittle deformation styles in the northern segment of the Tertiary Biluoxue- shan-Chongshan shear zone lying to the east of the Eastern Himalayan Syntaxis. In the northern... Here we describe ductile, ductile-brittle and brittle deformation styles in the northern segment of the Tertiary Biluoxue- shan-Chongshan shear zone lying to the east of the Eastern Himalayan Syntaxis. In the northernmost part of the zone in the vi- cinity of the Eastern Himalayan Syntaxis, it consists of mylonitic gneiss, granite, and schist. Based on field relations and min- eral assemblages, the rocks are classified into gneiss belt in the west limb, including banded gneiss, augen mylonite and mig- matite gneiss, and schist belt in the east limb. Except for the massive granite pluton, the other three tectonites are affected by polystage deformation (D1-D4). Fold deformation of the first stage D1 is isoclinal to tight pattern with nearly N-S fold axes and steeply axial planar cleavage S 1, which resulted in the local crustal thickening under a contractive setting. D2 overprinted D1 and is characterized by tight folds with steep axes and N-S fold axial planar, which are also characterized by large-scale ductile strike-slip shear foliation $2, parallel to the nearly N-S trending axial planes of D1 and D2. The structural pattern of D2 represents a transpression along the zone. D3 occurred during the late stage of the transpression or post-transpression, produc- ing the NW-SE and NE-SW trending strike-slip faults of the third stage D3. Following the D3 deformation, the zone was ex- humed to shallow crustal level where the various tectonites underwent a brittle transtensional deformation D4, combined with one N-S trending strike-slip component and one normal faulting component. Structures and previous geochronologies pre- sented in the paper suggest that the study area is correlated with those in the adjacent tectonic zones, Ailaoshan-Red River shear zone and Gaoligong shear zone in the western Yunnan. It underwent intensive polyphase deformation, namely, crustal thickening, transpression, and transtension, responding to syn-collision and post-collision of India-Eurasia from 65 Ma to cur- rent period east of the Eastern Himalayan Syntaxis. 展开更多
关键词 Biluoxueshan-Chongshan shear zone TERTIARY structure polystage deformation
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Deformation characteristics and genesis of the Waziyu metamorphic core complex in western Liaoning of China 被引量:4
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作者 ZHANG BiLong ZHU Guang +3 位作者 CHEN Yin PIAO XueFeng JU LinXue WANG HaoQian 《Science China Earth Sciences》 SCIE EI CAS 2012年第11期1764-1781,共18页
The Waziyu metamorphic core complex is situated at the eastern end of the Yanshan tectonic belt.The NNE-striking detachment ductile shear zone in the core complex lies between the Archean metamorphic basement and Fuxi... The Waziyu metamorphic core complex is situated at the eastern end of the Yanshan tectonic belt.The NNE-striking detachment ductile shear zone in the core complex lies between the Archean metamorphic basement and Fuxin-Yixian rift basin,dips NW gently,and shows corrugation folds.Exposure structures,microstructures,and quartz C-axis fabrics all indicate top-to-the WNW sense of shear,i.e.,ca.285°,for the shear zone.Estimates of the deformation temperatures(ca.550-250°C) demonstrate its mid-crustal origination and progressive deformation from deep to shallow levels.The northern segment of the shear zone shows relatively weak exhumation with exposures of low-temperature mylonites whereas its middle and southern segments have more intense uplifting with exposures of high-temperature mylonites.Biotite and muscovite 40 Ar/39 Ar ages,U-Pb dating results of zircon from dikes and plutons as well as formation ages of the supra-detachment basin all suggest the formation time of 135-100 Ma for the core complex.The formation was also associated with syntectonic emplacement of the Early Cretaceous Shishan pluton.The western margin of the core complex was truncated by the Sunjiawan-Shaohuyingzi brittle normal fault when it uplifted to shallow crust levels,and finally exhumed to near-surface levels.The core complex was developed by the rolling-hinge model under WNW-ESE extension during the Early Cretaceous peak destruction of the North China Craton.Ductile flow did not appear in the lower plate,therefore not supporting the low-crust gravitational collapse. 展开更多
关键词 Waziyu metamorphic core complex detachment shear zone 40 Ar/39 Ar dating rolling-hinge model craton destruction
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