吉林夹皮沟金矿带控矿构造特征及演化模式

夹皮沟金矿带是中生代构造－岩浆－成矿作用的产物，矿脉直接受脆性断裂控制，控矿构造类型分为空间方位型和外接触带断裂型。矿脉我性特征揭示出夹皮沟和带与石棚鑫在洞金矿为低序次与高序次关系。     

三江义敦岛弧带构造演化与成矿作用关系研究

义敦岛弧是中国西南三江地区多岛弧盆系中十分关键的构造单元,更是研究全球碰撞造山作用的天然实验室,其所蕴含的矿产资源潜力巨大。构造对成矿作用的时空分布具有极明显的控制作用,由此本文总结并提出义敦岛弧造山带三大成矿作用:1印支晚期俯冲造山弧间裂谷成矿作用;2燕山晚期造山后伸展成矿作用;3喜马拉雅期陆内汇聚与走滑成矿作用。本文在总结前人大量研究的基础上,以大地构造理论为依托,结合区域地层概况,对该区构造动力演化和转换体制及其与成矿作用的相互关系等方面进行深度剖析,以期能对人们在该区进行成矿理论研究和找矿预测等方面提供帮助和指导。     

河台金矿剪切带构造演化及其与金成矿关系

通过对河台金矿含矿构造带的构造演化过程与剪切带演化过程中的金成矿研究,结果表明,深层韧性剪切作用在早中海西期形成糜棱岩带——容矿构造带(当期金迁出)、晚海西期和印支期(重要的成矿时期)提供含金热液,燕山期以后对金成矿的作用不明显。印支期,侵入作用为金成矿提供大量热液,对金进一步富集起重要作用。     

伊春-延寿构造带斑岩型钼矿矿床成因及地质特征

伊春-延寿构造带是重要的多金属成矿带,已发现多处钼矿。本文将伊春-延寿构造带成矿构造背景划分为加里东期成矿系列和印支期成矿系列。加里东期成矿系列形成于松嫩和佳木斯地块拼合、碰撞造山的大地构造背景。印支期成矿系列则形成于板内拉分-走滑的构造环境。在古太平洋俯冲挤压的背景下,与板块俯冲体制下的挤压向伸展转换的过程中,形成了一系列深大断裂带,幔源物质上涌形成了该区中生代构造岩浆岩带和相关的斑岩型钼矿床。以该构造带内的鹿鸣斑岩型钼矿床和霍吉河斑岩型钼矿床为对比分析研究对象,研究了与成矿有关的地层、构造、岩浆岩和变质岩,分析了斑岩型钼矿床地质特征及找矿标志。认为斑岩型钼矿的主要成矿时代为燕山早期;围岩蚀变呈面型展布,以钾化、石英-绢云母化为主;霍吉河钼矿床和鹿鸣钼矿床的斑岩体及围岩为偏铝质过铝质、高钾钙碱性系列的 I型花岗岩,具有类似于活动大陆边缘花岗岩的岩石组合特征。同时对伊春-延寿构造带内的找矿潜力做了评价。     

甘肃阳山金矿带构造变形特征研究

阳山金矿带内构造变形复杂强烈,对构造变形特征的系统研究表明:阳山金矿带内发育有A型线理、石香肠、旋转碎斑等构造,这些构造大部分都表现出由北向南的韧-脆性剪切特征;对褶皱轴面产状的统计表明其主应力方向为近南北向;利用石英颗粒动态重结晶法得到古应力值为45.55 MPa。结合蠕变方程得到变形平均应变速率为3.6×10-10s-1;根据矿物显微变形特征认为变形形成温度为280～400℃,应发生于地壳深度不超过12 km的范围内;依据斜长花岗斑岩形成时间及地层变形特征,认为剪切变形形成于晚三叠世—早白垩世;结合阳山金矿成矿特点,认为该剪切对本区金的活化、迁移富集以及最终金矿体的最终定位,有着极其重要的控制作用。     

山东灵雀山金矿控矿构造特征及演化模式

灵雀山金矿虽为分布在变质岩区的石英脉型金矿床,但基于控矿构造类型、低序次构造成矿特征、控矿构造与脉岩岩浆活动关系、控矿构造最佳部位的确定等,表明灵雀山金矿床主要受NNE、NW和近EW向脆性构造控制,属中生代构造-岩浆-成矿作用的产物,与区域地壳演化相一致.     

岳家庄-虎头崖构造杂岩带金成矿地质条件及找矿预测

鲁西地区是我国著名的花岗-绿岩带分布区，金成矿与之关系密切。其中岳家庄-虎头崖构造杂岩带为重要的多金属成矿带，泰山岩群花岗-绿岩带为金成矿主要矿源层，退变质带和燕山期岩体的边部为主要赋矿部位。金异常沿NW向构造展布，金矿化严格受构造控制。该构造杂岩带成矿条件良好，是金成矿的有利靶区。     

吉林天合兴-王家店金-多金属矿带控矿构造与成矿

天合兴-王家店金-多金属矿带中,已发现近10处小型金、银、铜、铅、锌矿床.该地区经历了多次剧烈的构造-岩浆事件,多期的构造、岩浆活动为本地区金-多金属矿的富集成矿创造了有利条件.经研究认为南北向断裂是天合兴-王家店金-多金属矿带的导矿构造,北东向和北西向共轭剪切断裂是容矿构造,北东向断裂在空间上具等距分布的特点,同时常伴随有辉绿岩、花岗闪长岩、正长斑岩等脉岩侵入.这些规律的发现在本区提高了地表工程的有效性,缩短了勘查周期,对找矿勘查具有重要的指导意义.     

雪峰弧形构造带金矿类型及分布特征

文中从总结雪峰弧形构造带内各典型金矿床地质特征入手,提出一个简明的金矿床分类方案,将区内金矿床类型分为石英脉型金矿与蚀变岩型金矿2个大类,石英脉型金矿又分为顺层与切层石英脉型2个亚类,蚀变岩型金矿分为破碎带蚀变岩型、韧性剪切带蚀变岩型与破碎蚀变砂岩型3个亚类,并阐述了不同类型的金矿与不同的地层岩性及构造组合之间的关系,以期指导区内金矿床勘查及开发工作.     

内蒙古安家营子金矿田韧-脆性剪切带控矿特征及矿化分布规律

韧-脆性剪切断裂构造是安家营子金矿田内破碎蚀变带型、石英脉型和蚀变岩型3种矿化类型的主要控矿构造,文中阐述了韧-脆性剪切断裂构造对金矿化空间展布特征、矿体产出形态、富集部位及构造活动的多期性、矿化阶段的控制作用,同时总结了矿床在空间上等距离分布的规律。     

东昆仑中西段断山南构造混杂岩带岛弧型 火山岩岩石地球化学特征?

断山南构造混杂岩带岛弧型火山岩主要岩性为灰绿色蚀变英安岩和蚀变安山岩。岛弧型火山岩微量元素地球化学特征显示明显富集Ba、Th、U等大离子亲石元素,亏损Nb、P、Ti等高场强元素;稀土元素地球化学特征显示轻重稀土分馏明显,Eu负异常较为明显。通过同位素测年,蚀变安山岩形成年龄为481.2±8.3 Ma,形成于晚寒武世-早奥陶世。岩石学、地球化学和年代学特征表明,岛弧型火山岩可能为板块碰撞前俯冲作用背景下火山弧环境的产物。     

Petrogenesis of Indosinian Granitoids in Middle-Segment of South Qinling Tectonic Belt:Constraints from Sr-Nd Isotopic Systematics

South Qinling Tectonic Belt (SQTB) is located between the Shangzhou-Danfeng and Mianxian-Lueyang sutures. There are a lot of early Mesozoic granitoid plutons in its middle segment,comprising the Dongjiangkou-Zhashui granitoid plutons at the northeast, Huayang-Wulong-Laocheng granitoid plutons at the central part, Xiba granitoid pluton at the northwest and Guangtoushan-Liuba granitoid plutons at the southwest. These Indonisian granitoids contain a mass of various scale mafic enclaves, which show sometimes clear boundaries and sometimes transitional boundaries with their host granitoids. These granitoids also exhibit metaluminous to peraluminous series, commonly higher Mg# and a wide range of petrochemistry from low-K tholeiite series, through mid-K and high-K calc-alkaline series to shoshonite series and predominated samples are attributed to mid-K and high-K calc-alkaline series. Detailed analyses in Sr-Nd isotopic systematics and petrochemistry reveal that there may be regionally initial granitoid magma of the Indonisian granitoid plutons, comprising Dongjiangkou-Zhashui, Huayang-Wulong-Laocheng, Xiba, and Guangtoushan-Liuba granitoid plutons, which were produced by hybrids of magmas in various degrees, and the initial magmas were derived from both the mantle and the lower continental crust (LCC) sources in the SQTB. The initial granitoid magma further did the magma hybrid with the magmas from the LCC, crystallization fractionation, and assimilation with upper crustal materials during their emplacement to produce these granitoid plutons in the SQTB. These magmatism processes are most likely to occur under continent marginal arc and syn-collision to post-collision tectonic backgrounds.     

U-Pb Dating of Volcanic Rocks and Granites along the Wuyishan Belt: Constraints on Timing of Late Mesozoic Tectonic Events in Southeast China

Five volcanic rock samples and two granite samples taken from the volcanic basins in western Fujian and southern Jiangxi were dated by using the zircon laser albation-inductively coupled plasma mass spectrometry U-Pb method. Together with previously dated ages, the dates obtained provide important constraints on the timing of late Mesozoic tectonic events in SE China. The volcanic rock samples yield ages of 183.1±3.5 Ma, ca. 141 Ma to 135.8±1.1 Ma, 100.4±1.5 to 97.6±1.1 Ma, confirming three episodes of late Mesozoic volcanic activities, which peaked at 180±5 Ma, 140±5 Ma and 100±5 Ma, respectively, along the Wuyishan belt. Moreover, based on field investigations of these volcano-sedimentary basins, we have recognized two compressional tectonic events along this belt The early one was characterized by Upper Triassic to Middle Jurassic NNE-trending folds that were intruded by late Jurassic granites; and the late one caused the Lower Cretaceous volcano-sedimentary layer to be tilted. The dated age 152.911.4 Ma of the granitic samples from the Hetian granitic pluton in the Changting Basin and that from the Baishiding granitic pluton, 100.2±1.8 Ma, in the Jianning Basin, give the upper boundaries of these two tectonic events respectively. Hence, the late Mesozoic tectonic evolution of SE China was alternated between extension and compression.     

东坪金矿区构造条块分析与成矿预测

本文中的构造主指断裂构造，条块是指不同断裂构造发育的一定地质单元或由断裂构造切割形成的地质单元．通过对东坪金矿区构造条块体系的具体分析，提出了一些成矿观点，同时进行了较具体的成矿预测，这对地质找矿提出了一个思路．     

胶带运输机胶带的跑偏和调整

系统地阐述了胶带运输机的胶带因滚筒、支承设备、辅助设备上和胶带自身运行导致的胶带跑偏的原因和调整措施。     

故障树分析法在皮带机胶带故障诊断中的应用探讨

应用故障树分析法能系统地分析出皮带机胶带破损的原因,在故障树图上,因果关系明确,很快就能找出事故发生的主要原因,从而制定有效措施,预防事故的发生。     

高位通廊带式输送机换带方法

包钢巴润矿业分公司为安全快速完成高位通廊带式输送机换带工作,紧密结合输送机现场布置实际,通过理论计算分析,提出了一种全新的高位通廊输送机换带方法,依靠输送机驱动装置,辅助以工程车辆,低速运转输送机,利用旧带导出新带,喂入新带同时导出旧带,然后硫化胶接新带。     

Tectonic environment and cause of earthquakes in the Three Gorges reservoir area

Seismotectonics in the Three Gorges reservoir area is investigated by using the P-wave tomography with earthquakes that occurred before the impoundment of the reservoir. The result indicates that most of these events occurred in or around the velocity-gradient belts between high-velocity and low-velocity anomalies.These belts have similar characteristics to buried-fault zones. Stresses generated by movement of partially molten upper-mantle materials and thermal stress may have jointly contributed to the seismic activities along the faults and such buried faults, and possibly activated new earthquake ruptures.     

大型带式输送机功率配比与带强关系

在对大型水平、上运、下运带式输送机实例计算中,进行了输送带最大张力公式简化选型比较,得出几种驱动功率配比与输送带带强的相应关系.     

长距离大型带式输送机输送带服役寿命的研究

系统研究长距离、高带速、大型带式输送机输送带的服役寿命，找出影响其服役寿命的原因，提出延长其服役寿命的技术途径。