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The Ductile Deformation Characteristics of Caledonian Intracontinental Orogeny in the Northeastern Jiangshan-Shaoxing Tectonic Zone:Insights from Magnetic Fabric Study and Its Geodynamic Implication 被引量:3
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作者 GONG Genhui CHEN Hanlin +2 位作者 WANG Fang LIN Xiubin MENG Lifeng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第1期75-87,共13页
The Jiangshan-Shaoxing tectonic zone was the northeastern boundary between the Yangtze Block and the Cathaysia Block during the Neoproterozoic and was an intracontinental orogenic belt during late of the early Paleozo... The Jiangshan-Shaoxing tectonic zone was the northeastern boundary between the Yangtze Block and the Cathaysia Block during the Neoproterozoic and was an intracontinental orogenic belt during late of the early Paleozoic. In this tectonic zone, there develops a lot of mylonite underwent strong ductile deformation and schist, gneiss, and amphibolite with medium and high grade metamorphism which was formed during the late of early Paleozoic. The research of geometry and kinematic of ductile deformation in Jiangshan-Shaoxing tectonic zone is very important to reveal the tectonic process of intracontinental orogeny. This paper uses the anisotropy of magnetic susceptibility (AMS) to determine the ductile deformation geometry and kinematic of Jiangshan-Shaoxing tectonic zone combing with the field survey. In this study, 190 specimens of 19 locations and 221 specimens of 23 locations from Wangjiazhai section and Lipu-Sizhai section were analyzed. The magnetic foliation over magnetic lineation in both Wangjiazhai and Lipu-Sizhai sections together with the field observations indicated a compressional deformation pattern. 3 and 4 strong ductile deformation zones can be established in the Wangjiazhai section and the Lipu-Sizhai section, respectively. According to the magnetic fabric and petro-fabric studies, the Northeastern Jiangshan-Shaoxing tectonic zone suffered two kinds of deformation patterns during the late early Paleozoic, i.e., the thrusting deformation followed by sinistral shear deformation. 展开更多
关键词 magnetic fabric ductile deformation deformation intensity deformation pattern Jiangshan-Shaoxing tectonic zone
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Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation 被引量:4
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作者 M.Q.Jiang G.Wilde +1 位作者 F.Jiang L.H.Dai 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2015年第5期200-204,共5页
A theoretical model that takes into account the flee-volume aided cooperative shearing of shear transformation zones (STZs) is developed to quantitatively understand the ductile-to-brittle transition (DBT) of meta... A theoretical model that takes into account the flee-volume aided cooperative shearing of shear transformation zones (STZs) is developed to quantitatively understand the ductile-to-brittle transition (DBT) of metallic glasses. The STZ dilatational strain is defined as the ratio of STZ-activated free volume to STZ volume itself. The model demonstrates that the STZ dilatational strain will increase drastically and exceed the characteristic shear strain of STZ as temperature decreases below a critical value. This critical temperature is in good agreement with the experimentally measured DBT temperature. Our results suggest that the DBT of metallic glasses is underpinned by the transition of atomic-cluster motions from STZ-tvpe rearrangements to dilatational processes (termed tension transformation zones (TrZs)). 展开更多
关键词 ductile-to-brittle transitionMetallic glassFractureShear transformation zoneTension transformation zone
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CRACK TIP STRUCTURE AND DUCTILE-BRITTLE TRANSITION IN BULK SINGLE CRYSTALS 被引量:1
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《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第1期1-9,共9页
Based on the crack tip structure a new model of ductile -brittle transition was proposed. Using this new model we calculated the dependence of the transition temperature-strain rate over a wide range of strain rate. F... Based on the crack tip structure a new model of ductile -brittle transition was proposed. Using this new model we calculated the dependence of the transition temperature-strain rate over a wide range of strain rate. Finally the significance of this new model is discussed in detail. 展开更多
关键词 fracture mechanics disllocation dislocation free zone. crack tip ductile-brittle transition
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Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line 被引量:2
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作者 Nicole Armelle Wambo Simeni Depesquidoux Tchaptchet Tchato +2 位作者 Rose Noel Ngo Belnoun Jean Pierre Tchouankoue Alembert Alexandre Ganwa 《International Journal of Geosciences》 2017年第3期318-331,共14页
The work is a vivid description of the structural relationship between brittle deformation of the Precambrian basement in the southern continental part of the Cameroon Line and intrusive Paleozoic and Mesozoic basalt ... The work is a vivid description of the structural relationship between brittle deformation of the Precambrian basement in the southern continental part of the Cameroon Line and intrusive Paleozoic and Mesozoic basalt dykes swarms. A multidisciplinary approach that involves a combination of remote sensing techniques and field studies show that the major trend of brittle structures correspond to well-known regional structures: N70°E (Adamawa Shear Zone), N135°E (upper Benue trend) and N30°E (Cameroon Volcanic Line) corresponding to E-W and N-S directions respectively. Basalt dykes are associated to NE-SW, E-W and NW-SE oriented fractures. An integration of the available information on brittle structures and basalt dykes directions suggest an emplacement of the Mesozoic and Paleozoic basalt dykes structurally controlled by Precambrian structures that were originated through Riedel’s fracture kinematic model with dextral strike-slip Adamawa Shear Zone as the main shear zone during late stage of the Pan-African collision. Spatially, the restriction of the basalt dykes to the corridor of the Adamawa Shear Zone indicate that a rejuvenation of Precambrian faults may very well be the origin of the dykes with possibility that they may have been reworked several times during the Phanerozoic eon. 展开更多
关键词 BASALT DYKES brittle tectonicS Adamawa Shear zone Riedel Model Western GONDWANA
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Microcosmic analysis of ductile shearing zones of coal seams of brittle deformation domain in superficial lithosphere 被引量:28
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作者 JU Yiwen1,2, WANG Guiliang2, JIANG Bo2 & HOU Quanlin1 1. Graduate School, Chinese Academy of Sciences, Beijing 100039, China 2. College of Mineral Resources and Geosciences, China University of Mining & Technology, Xuzhou 221008, China 《Science China Earth Sciences》 SCIE EI CAS 2004年第5期393-404,共12页
The ductile shearing zones of coal seams in a brittle deformation domain in super-ficial lithosphere are put forward based on the study on bedding shearing and ductile rheology of coal seams. The macrocosmic and micro... The ductile shearing zones of coal seams in a brittle deformation domain in super-ficial lithosphere are put forward based on the study on bedding shearing and ductile rheology of coal seams. The macrocosmic and microcosmic characteristics include wrinkle fold, mymonitized zones and ductile planar structure of coal seams, etc., while the microcosmic characteristics may also include different optic-axis fabrics and the anisotropy of vitrinite reflectance as well as the change of chemical structure and organic geochemistry components. The forming mechanism is analyzed and the strain environment of ductile shearing zones of coal seams discussed. The result indicates that, in the superficial brittle deformation domain, the coal seams are easy to be deformed, resulting in not only brittle deformation but also ductile shearing deformation under the action of force. Because of simple shearing stress, the interlayer gliding or ductile rheology may take place between coal seams and wall rocks. Therefore, many ductile shearing zones come into being in superficial lithosphere (<5 km). The research on ductile shearing zone of brittle de-formation domain in superficial lithosphere is significant not only theoretically for the study of ductile shearing and ductile rheology of the lithosphere but also practically for the structural movement of coal seams, the formation and accumulation of coal-bed methane, and the preven-tion and harness of gas burst in coal mine. 展开更多
关键词 brittle deformation domain interlayer gliding ductile rheology ductile shearing zoneS of COAL seams COAL mymonite VITRINITE reflectance anisotropy.
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冀东金厂峪金矿剪切带控矿规律及找矿建议
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作者 鄂建新 缪广 +2 位作者 宁腾霄 郭运晨 张强 《世界有色金属》 2024年第1期82-84,共3页
冀东金厂峪金矿为典型受构造作用控制的矿床,金矿体主要产于NNE向脆-韧性片理化带内的强变形带之中,直接控矿构造为叠加于强变形带之上的NNE向燕山期脆性断裂构造。本文在详细的野外调查基础上进行了构造分期配套,建立了弱变形域控岩+... 冀东金厂峪金矿为典型受构造作用控制的矿床,金矿体主要产于NNE向脆-韧性片理化带内的强变形带之中,直接控矿构造为叠加于强变形带之上的NNE向燕山期脆性断裂构造。本文在详细的野外调查基础上进行了构造分期配套,建立了弱变形域控岩+强变形带赋矿的透镜体控矿模式,结合矿体赋存和矿化富集规律总结,提出了韧脆性片理化带深部、两侧次级平行构造等找矿方向。 展开更多
关键词 冀东 金厂峪金矿 脆-韧性变形 片理化带 强变形带 弱变形域
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高性能特厚板的研发
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作者 韩承良 狄国标 +1 位作者 董占斌 冯韦 《上海金属》 CAS 2024年第3期33-37,43,共6页
现有特厚板强度较低,低温韧性较差。研发了一种碳质量分数为0.065%的120 mm特厚钢板。研究了轧制加热温度和非再结晶区轧制总压下率对钢板奥氏体晶粒尺寸、显微组织和力学性能的影响。结果表明:在1200℃以下加热的钢板奥氏体晶粒长大不... 现有特厚板强度较低,低温韧性较差。研发了一种碳质量分数为0.065%的120 mm特厚钢板。研究了轧制加热温度和非再结晶区轧制总压下率对钢板奥氏体晶粒尺寸、显微组织和力学性能的影响。结果表明:在1200℃以下加热的钢板奥氏体晶粒长大不明显;在1250℃加热的钢板奥氏体晶粒平均尺寸为111μm,最大为295μm;随着非再结晶区轧制总压下率的增大,钢板铁素体增多,组织细化。通过控制加热温度和非再结晶区轧制总压下率试制的120 mm厚钢板屈服强度大于390 MPa,抗拉强度大于510 MPa,-60℃冲击吸收能量大于200 J,表面和表面以下50 mm处韧-脆转变温度低于-80℃。 展开更多
关键词 特厚板 加热温度 非再结晶区 总压下率 铁素体 韧-脆转变温度
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INVESTIGATION ON HOT DUCTILITY AND STRENGTH OF CONTINUOUS CASTING SLAB FOR AH32 STEEL 被引量:2
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作者 G. Y. Li X.F. Li L.G. Ao 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2006年第1期75-78,共4页
By means of Gleeble-1500 testing machine, the simulation of continuous casting process forAH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the diffe... By means of Gleeble-1500 testing machine, the simulation of continuous casting process forAH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the different temperatures and strain rates. The Precipitations of AIN at different temperatures and the fractures of high-temperature tensile samples were observed by using TEM (transmission electron microscope) and SEM (scanning electron microscope). The factors affecting the brittle temperature zone were discussed. 展开更多
关键词 continuous casting slab brittle temperature zone tensile strength ductility SIMULATION
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Microstructure and mechanical properties of heat affected zone in multi-pass GMA welded Al-Zn-Mg-Cu alloy 被引量:3
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作者 Jia-liang ZHOU Feng-yuan SHU +3 位作者 Hong-yun ZHAO Yao-hui Lü Yu-xin LIU Peng HE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第11期2273-2280,共8页
Microstructure and mechanical properties of the heat affected zone(HAZ)in multi-pass gas metal arc(GMA)welded Al Zn Mg Cu alloy plates were investigated,based upon which the mechanical anisotropy and fracture mechanis... Microstructure and mechanical properties of the heat affected zone(HAZ)in multi-pass gas metal arc(GMA)welded Al Zn Mg Cu alloy plates were investigated,based upon which the mechanical anisotropy and fracture mechanism were analyzed.The microstructure and composition were analyzed by scanning electron microscope(SEM)and energy dispersive spectroscope(EDS).X-ray diffractometer(XRD),transmission electron microscope(TEM)and selective area electron diffraction(SAED)were used to analyze the phase composition.The distribution of microhardness was identified as gradual transition and tensile strength had a tendency to decrease first and then increase.The distribution of nano-sizedη(MgZn2)particles in theα(Al)matrix and Al2MgCu phase determined the tensile performances along the thickness direction and led to the formation of ductile/brittle composite fracture in the HAZ.The continuous distribution of Al2MgCu phase in the strip intergranular precipitates gave birth to premature cracks and the brittle fracture region.The precipitated particles coarsening also led to the deterioration of mechanical properties. 展开更多
关键词 Al-Zn-Mg-Cu alloy heat affected zone microstructure mechanical properties ductile/brittle composite fracture
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陆内岩浆核杂岩隆起-拆离构造--胶东地区研究实例 被引量:3
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作者 吕古贤 焦建刚 +4 位作者 张宝林 吕承训 王宗秀 王红才 王翠芝 《地质通报》 CAS CSCD 北大核心 2023年第4期489-509,共21页
在胶东地区金矿矿田构造研究的基础上,把岩浆核杂岩和拆离构造联系起来,提出陆内岩浆核杂岩隆起-拆离构造的新模式,并认为中生代该区不发育变质核杂岩构造。经过10多年的构造变形蚀变岩相填图、岩浆岩结构构造填图和古地磁研究、运动学... 在胶东地区金矿矿田构造研究的基础上,把岩浆核杂岩和拆离构造联系起来,提出陆内岩浆核杂岩隆起-拆离构造的新模式,并认为中生代该区不发育变质核杂岩构造。经过10多年的构造变形蚀变岩相填图、岩浆岩结构构造填图和古地磁研究、运动学测量,结合地球物理资料分析发现,胶东地区典型的玲珑岩浆核杂岩隆起-拆离构造显示出长垣状、拱曲形态的穹窿,表现为:①穹窿核部由多期和多构造性质的花岗质杂岩组成;②花岗杂岩体被断层圈闭,这些中低角度铲状形态的拆离带剪切断裂,其宽大的破碎岩带显示了韧-脆性变形叠加,发生岩浆期后热液交代蚀变矿化作用;③拆离断层上盘岩石围绕岩浆核分布,由基底变质岩和中生代沉积岩组成,呈滑脱凹陷状态。岩浆核杂岩隆起-拆离构造是符合东亚陆内构造岩浆活化背景的一个新模式。通过岩浆核杂岩隆起-拆离构造研究,提出岩浆隆起和拉分盆地属于同一构造系统,挤压构造岩浆隆起和引张拆离凹陷带是应力场转化过程的产物,而拆离铲式断裂和脆-韧性叠加的构造岩带是成矿预测的目标,并把区域成岩成矿规律作为直接观测和勘查的标志,在区域地质成矿规律研究、地质调查、成矿预测等方面具有广泛推广价值和示范引导意义。 展开更多
关键词 岩浆核杂岩 岩浆核杂岩隆起-拆离构造 花岗岩结晶构造 拆离铲式断裂带 脆-韧性叠加 胶东地区
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岩浆核杂岩和变质核杂岩特征对比及控矿实例--南秦岭牛山-凤凰山变质核杂岩和牛山北岩浆核杂岩构造群落及控矿模式 被引量:1
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作者 杨兴科 何虎军 +3 位作者 晁会霞 朱昊磊 韩珂 王北颖 《地质通报》 CAS CSCD 北大核心 2023年第4期520-539,共20页
以南秦岭牛山-凤凰山变质核杂岩和牛山北岩浆核杂岩为例,通过核杂岩的构造群落、变质程度、岩浆侵位与变形时代、构造层次与演化、控矿特征与控矿构造-蚀变岩相填图及测年研究,对比2类核杂岩的特征及其控矿作用。结果表明,2类核杂岩有... 以南秦岭牛山-凤凰山变质核杂岩和牛山北岩浆核杂岩为例,通过核杂岩的构造群落、变质程度、岩浆侵位与变形时代、构造层次与演化、控矿特征与控矿构造-蚀变岩相填图及测年研究,对比2类核杂岩的特征及其控矿作用。结果表明,2类核杂岩有相似的结构样式,但构造群落和演化差别较大。牛山-凤凰山变质核杂岩核部为新元古代武当岩群和耀岭河岩组中深变质岩,其中可见新元古代石英闪长岩和加里东期辉石岩-辉绿岩株,说明是在新元古代或加里东期形成的。核杂岩与外围震旦系-泥盆系浅变质岩间由剥离断层及韧性剪切带分割。志留系梅子垭岩组为浅变质强变形的岩片组合,发育多层次韧性剪切、固态流变、滑脱-逆冲-走滑变形3期新生面理及其置换。而牛山北岩浆核杂岩核部和外围是浅变质岩,在核部和外围填图、测试时发现新元古代、早古生代、三叠纪、侏罗纪4期侵入岩,与岩浆核杂岩相关的有三叠纪-早侏罗世二长花岗岩株和晚侏罗世花岗岩脉2期侵入岩。研究发现,与岩浆核杂岩伴随的岩浆侵位、韧性剪切变形与热变质增温-变斑晶加大-自然金沿S 2面理分布-金矿化热液蚀变等的时代均集中在晚三叠世-侏罗纪,指示了时代较新的陆内造山期岩浆核杂岩的脆-韧性剪切变形-立交桥式岩浆-热力垂向增生-热液蚀变成矿时空关联特点及深部找矿方向。 展开更多
关键词 岩浆核杂岩 变质核杂岩 构造群落 脆-韧性剪切带 控矿构造模式 金矿成矿规律 南秦岭
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Damage Studies of Brittle-Ductile Transition in PP EPDM Blends
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作者 李强 郑文革 +1 位作者 漆宗能 吴选征 《Science China Chemistry》 SCIE EI CAS 1993年第11期1300-1306,共7页
Damage zones of brittle-ductile (B-D) transition in PP/EPDM blends are studied in this paper. The contribution of crazing and shear yielding zones in damage zones to energy dissipation of blends was measured with comp... Damage zones of brittle-ductile (B-D) transition in PP/EPDM blends are studied in this paper. The contribution of crazing and shear yielding zones in damage zones to energy dissipation of blends was measured with computer image analysis (CIA) and the transition of shear yielding zone (A_(sh)) with rubber volume fraction (V_f) was also manipulated. Results showed that the B-D transition of impact strength of blends corresponded to the fracture mechanism in PP/EPDM blends, from matrix crazing to matrix shear yielding. In addition, two new parameters, density of energy dissipation for crazing zone (F_(cz)) and for shear yielding zone (F_(sh)), are first obtained in this paper. The value of F_(sh) is about four times larger than that of F_(cz) for PP/EPDM blends, which confirmed that the matrix shear yielding is a more effective way of energy dissipation in blends. 展开更多
关键词 brittle-ductile transition damage studies pereolation model density of energy dissipation for crazing zone(F_(cz)) density of energy dissipation for shear yielding zone(F_(sb)).
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北秦岭陕西华阳川地区铀矿物质来源 被引量:2
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作者 张熊猫 陈冰 +6 位作者 杨蓉 陈军 程佳孝 江宏君 李鹏 叶兴超 康清清 《地质通报》 CAS CSCD 北大核心 2023年第2期420-430,共11页
华阳川铀矿床位于老牛山岩体与华山岩体夹持部位,矿体严格受控于NW—SE向华阳川脆韧性剪切带,赋矿岩石以石英碳酸岩为主,伟晶岩次之。关于华阳川铀矿床的物质来源一直没有较可信的研究成果。系统收集航放、地质、钻探、选冶试验等资料,... 华阳川铀矿床位于老牛山岩体与华山岩体夹持部位,矿体严格受控于NW—SE向华阳川脆韧性剪切带,赋矿岩石以石英碳酸岩为主,伟晶岩次之。关于华阳川铀矿床的物质来源一直没有较可信的研究成果。系统收集航放、地质、钻探、选冶试验等资料,采用地表放射性物探、地质、锆石U-Pb定年等手段,计算各地质体(单元)的放射性能谱特征、年龄特征,研究岩体、脉岩的构造展布规律和放射性元素的迁移规律,揭示华阳川铀矿的成矿物质来源。地表伽玛能谱特征显示,华山岩体翁峪花岗岩U含量为4.82×10^(-6)~6.46×10^(-6),Th含量为23.03×10^(-6)~31.08×10^(-6),Th/U值为5.29~6.00;老牛山岩体主要岩石单元U含量为9.27×10^(-6)~11.18×10^(-6),Th含量为24.39×10^(-6)~27.72×10^(-6),Th/U值为2.64~3.55,两者均具有高铀、高钍的特征;地球化学特征显示,华山岩体与老牛山岩体均具有埃达克质岩的特征,为不同期次的同源富铀体,但华山岩体翁峪花岗岩有较明显的铀源体特征;放射性航空物探特征显示,华阳川矿区韧性剪切带中具有铀迁入富集特征;地质年代背景研究显示,华山岩体翁峪花岗岩与华阳川矿区含矿石英碳酸岩成岩年龄基本一致,均形成于235~200 Ma;构造背景研究显示,第一次造陆事件(约1800 Ma)至印支期形成的多期次脆韧性剪切带底部直接与华山岩体连通,为活化铀的迁移提供了有利通道。研究表明,华山岩体翁峪花岗岩中的U元素被活化、迁移后,为华阳川铀矿提供了大量的铀源。 展开更多
关键词 华阳川 华山岩体 翁峪花岗岩 铀矿 物质来源 脆韧性剪切带 石英碳酸岩
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Evolution of the ductile shear zone of the Paishanlou gold deposits,western Liaoning,China 被引量:1
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作者 NI JinLong LIU JunLai +2 位作者 TANG XiaoLing ZHAO ChunQiang ZENG QingDong 《Science China Earth Sciences》 SCIE EI CAS 2014年第4期600-613,共14页
The combination of field surveys with analysis of microstructure of tectonite and Electron Backscatter Diffraction(EBSD) on quartz fabric indicated that three periods of ductile shear events developed in the Paishanlo... The combination of field surveys with analysis of microstructure of tectonite and Electron Backscatter Diffraction(EBSD) on quartz fabric indicated that three periods of ductile shear events developed in the Paishanlou gold deposits and the E-W and NE-striking ductile shear zones were formed during each event.The E-W-striking ductile shear zone,accompanied by compressional and dextral shear slip,was shear-cut by the NE-striking shear zones,accompanied by compressional-sinistral shear slip and sinistral-normal shear slip,successively.An E-W-striking ductile shear zone developed at a deeper tectonic level and at middle- to high-temperatures,accompanied by abundant microstructures,including microlayering between a polycrystal quartz belt and mica,and quartz deformation was depended on cylinder(10-10) or <c> glide.The development of an E-W-striking shear zone can be seen as a tectonic pattern in the region of the Paishanlou gold deposits of the collision between the Mongolian tectonic belt and the North Archean Craton from Suolun to the Linxi suture zone during the Indosinian.The NE-striking ductile shear zone developed approximately 160 Ma during the early Yianshanian at middle to shallow tectonic levels and at middle- to low-temperatures,accompanied by typical microstructures,including polycrystal quartz aggregation and quartz subgrain rotation recrystallization,etc.,and quartz deformation was depended on prismatic(1011) glide.The last ductile shear event around the NE-striking shear zone developed at low temperatures and shallow tectonic levels,yielding to a pre-existing NE-striking shear zone,accompanied by abundant microstructures,including low-temperature quartz grain boundary migration and bulging recrystallization.The last ductile shear movement may be related to lithosphere thinning and the destruction of the North China Craton from approximately 130-120 Ma,and this shear event resulted directly in the mineralization in the Paishanlou region. 展开更多
关键词 Paishanlou gold deposits ductile shear zone MICROSTRUCTURE EBSD tectonic evolution
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山西五台山—恒山太古代绿岩带金矿及其典型矿床地质特征
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作者 郭国海 姜宇 黄晋荣 《世界地质》 CAS 2023年第1期50-60,共11页
山西五台山—恒山太古代绿岩带金矿为华北板块区绿岩带中规模最大又十分典型的金矿床之一。矿体主要赋存于五台群柏枝岩组、金岗库组硅铁建造与鸿门岩组云母石英片岩中,典型金矿床有山西五台山东腰庄和代县小板峪金矿床等;金矿体呈似层... 山西五台山—恒山太古代绿岩带金矿为华北板块区绿岩带中规模最大又十分典型的金矿床之一。矿体主要赋存于五台群柏枝岩组、金岗库组硅铁建造与鸿门岩组云母石英片岩中,典型金矿床有山西五台山东腰庄和代县小板峪金矿床等;金矿体呈似层状、透镜体状产出,矿床与太古代绿岩带硅铁建造和脆-韧性剪切带密切相关;矿石类型以含黄铁矿化绢云钠长片岩为特征,金主要赋存于黄铁矿中;硅化、黄铁矿化等围岩蚀变与金矿化关系密切;金矿床成因为与太古代绿岩带硅铁建造和脆-韧性剪切带密切相关的变质热液型。 展开更多
关键词 绿岩带 硅铁建造 脆-韧性剪切带 东腰庄金矿 小板峪金矿 太古代
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广东大坪坑金矿区成矿特征及找矿前景研究
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作者 周腾 《世界有色金属》 2023年第23期70-72,共3页
韧性剪切带含金蚀变糜棱岩型矿床是一种重要且广泛分布的金矿类型,本文通过对大坪坑矿区的各种成矿地质特征进行系统的研究,来分析其找矿前景。
关键词 韧性剪切带 脆性断裂 糜棱岩 金矿
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甘肃大店沟金矿床剥蚀程度及深部找矿方向
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作者 曹瑞荣 缪广 +3 位作者 曹雪峰 艾忠林 来召 王旭阳 《世界有色金属》 2023年第11期49-51,共3页
大店沟金矿位于甘肃省陇南市北东部,是近年来新发现的中型金矿床,为评价矿床深部资源潜力及找矿方向,本文在分析矿体产出状态、矿化类型垂向变化等特征的基础上,结合矿体黄铁矿热电性剥蚀率定量计算,确定大店沟金矿总体剥蚀率73.69%,表... 大店沟金矿位于甘肃省陇南市北东部,是近年来新发现的中型金矿床,为评价矿床深部资源潜力及找矿方向,本文在分析矿体产出状态、矿化类型垂向变化等特征的基础上,结合矿体黄铁矿热电性剥蚀率定量计算,确定大店沟金矿总体剥蚀率73.69%,表明中上部遭受了较大程度的剥蚀,但深部仍有一定找矿前景和资源潜力。矿床北东段剥蚀程度较大,而南西段剥蚀程度相对较小,为下一步找矿重点方向。 展开更多
关键词 大店沟金矿 韧脆性剪切带 黄铁矿热电性 剥蚀率 深部找矿方向
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山东玲珑—焦家地区形变类型与金矿的关系 被引量:37
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作者 卢焕章 Guy Arcambault +6 位作者 李院生 魏家秀 陈娜娜 张国平 袁万春 陈晓枫 龙洪波 《地质学报》 EI CAS CSCD 北大核心 1999年第2期174-188,T002,共16页
山东玲珑-焦家地区的金矿床根据其地质和剪切带特征可分为含金石英黄铁矿大脉型(玲珑)和蚀变岩型(焦家),它们均产于花岗岩中。郯-庐断裂是区域性的、可能深及上地幔的深大断裂,具有区域剪切的性质。在它的作用下,胶东地区形成了一系列... 山东玲珑-焦家地区的金矿床根据其地质和剪切带特征可分为含金石英黄铁矿大脉型(玲珑)和蚀变岩型(焦家),它们均产于花岗岩中。郯-庐断裂是区域性的、可能深及上地幔的深大断裂,具有区域剪切的性质。在它的作用下,胶东地区形成了一系列剪切带和断裂带。在破头青韧性剪切带的两侧,尤其是左侧,形成了一系列雁行状排列的脆-韧性剪切带,在其中充填和交代形成了玲珑含金石英脉和网脉状以及蚀变岩型矿床。焦家剪切带、河东-河西剪切带属于脆性剪切带。在这种脆性剪切作用下岩石发生形变变成格子状,当含金的成矿流体进入这种格子状的裂隙时,与围岩发生交代作用,从而形成了焦家蚀变岩矿体。在纯的韧性剪切带中是糜棱岩;在脆-韧性剪切带中为初糜棱岩和角砾岩;而在脆性剪切带中则是碎裂岩。关于矿化在剪切带中的位置,笔者认为,焦家矿床的矿化位于脆性剪切带中,在浅部(上部);玲珑西山的含金石英脉型矿化位于脆-韧性剪切带中,即在中部;而产在韧性剪切带中的矿床(如产在破头青剪切带中的矿体)则是位于深部。 展开更多
关键词 金矿床 矿床地质 山东 构造变形 玲珑-焦家地区
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1906年新疆玛纳斯大震区的多层次逆冲构造与深部结构 被引量:17
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作者 杨晓平 顾梦林 +2 位作者 孙振国 赵成斌 周庆 《地震地质》 EI CSCD 北大核心 2002年第3期303-314,共12页
通过对天山北麓 190 6年玛纳斯 7 7级地震区的浅层地震探测资料、石油地震反射剖面、二维电性结构剖面、深地震反射剖面的研究 ,发现玛纳斯地震区多层次活动构造系统的根带 ,它通过脆 -韧转换带与天山活动构造块体内上地壳中的低速、高... 通过对天山北麓 190 6年玛纳斯 7 7级地震区的浅层地震探测资料、石油地震反射剖面、二维电性结构剖面、深地震反射剖面的研究 ,发现玛纳斯地震区多层次活动构造系统的根带 ,它通过脆 -韧转换带与天山活动构造块体内上地壳中的低速、高导层连为一体。低速、高导层可能是天山地壳内正在活动的韧性剪切带 ,而齐古逆断裂 -褶皱带下的脆 -韧转换带是连接深部活动韧性剪切带与地壳浅部脆性破裂的枢纽 ,也是现今孕育和发生大地震的重要构造部位。 190 6年玛纳斯地震发生在脆韧转换带的底部 ,地震区的活动逆断裂和褶皱只是部分记录了深部韧性剪切带活动的信息。 展开更多
关键词 1906年 新疆 浅层构造 深部结构 脆-韧转换带 韧性剪切带 玛纳斯地震区
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陕西凤县八卦庙超大型金矿床成矿地质特征及成矿作用 被引量:59
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作者 冯建忠 汪东波 +3 位作者 王学明 邵世才 马治国 张选固 《地质学报》 EI CAS CSCD 北大核心 2003年第3期387-398,共12页
本文通过Ar-Ar同位素计时、稳定同位素示踪、石英位错观察、差异应力计算和热水沉积岩研究等,探讨了八卦庙超大型金矿床的成矿作用和成矿机制。NW向无根揉皱石英脉含Au 0.5×10^(-6)~4×10^(-6),矿化元素组合为Au+Cu+Pb+Zn,Ar... 本文通过Ar-Ar同位素计时、稳定同位素示踪、石英位错观察、差异应力计算和热水沉积岩研究等,探讨了八卦庙超大型金矿床的成矿作用和成矿机制。NW向无根揉皱石英脉含Au 0.5×10^(-6)~4×10^(-6),矿化元素组合为Au+Cu+Pb+Zn,Ar-Ar坪年龄232.58±1.59Ma;NE向石英脉含An大于4×10^(-6),可达37.2×10^(-6),Au为主,Ar-Ar年龄为131.91±0.98Ma。研究表明:①泥盆纪热水沉积岩为金矿床的形成提供了矿源,成矿热液水以岩浆水为主,从矿质富集到成矿至少经历了印支期挤压推覆、韧性剪切→印支晚期—燕山期岩浆热液作用;②印支晚期和燕山早期(即韧性构造变形向脆性变形的转换期)是本区金矿成矿的高峰期;③多期成矿作用叠加、多次脉动式构造活动的“应力泵”作用是该超大型金矿床成矿的主因。 展开更多
关键词 八封庙金矿 热水沉积 脆-韧性剪切 位错 成矿年代 秦岭 陕西 成矿作用 地质特征
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