广东省乐昌市罗家湾地区钨钼矿地质特征及找矿方向探讨

通过对研究区岩性、矿化及围岩蚀变等的观察得出,研究区石英脉既是成矿时期热液活动的产物,也是后期最有利的含矿脉岩,更是钨钼矿勘查最直观的找矿信息。绢云英岩化对成矿有着积极作用,石英脉体中的矿化与绢云英岩化具有正相关关系,从石英脉的产出空间形态判断,在地质时期,石英脉的形成与张性断裂带的发育密切相关,并根据不同石英脉的倾角不同,在平面图上进行数理统计得出,沿张性断裂带对称中脊线两侧,各分别分布着一组倾向相同的石英脉,即对称中脊线两侧的石英脉倾向恰好相反。对断裂带对称中脊线在空间位置上的勘查,有助于对群脉型石英脉所控制钨钼矿体勘查基线的确定,推断的中脊线两侧也是主要的钨矿找矿耙区。     

水库滑坡的稳定性分析及加固设计研究

水库滑坡形成机理和稳定性分析及应对是当前工程施工中的重要复杂问题。以唐河水库某滑坡防治工程为例,首先从地质成因、物质组成、结构特征与运动特性等方面对地质的变形机理进行了深入分析;然后针对滑坡形成机理,综合极限平衡法、Janbu Simplified、Janbu Corrected等计算方法对滑坡稳定性进行计算,设计了加固措施并进行了加固力计算,1年的实践观察和反馈表明工程实施措施的有效性。     

清镇市卫城镇长冲矿区隐伏铝土矿地质特征及找矿方向

贵州省铝土矿资源丰富,其中清镇—修文铝土矿矿集区已探明铝土矿各类保有资源量3.5亿t,但该区因褶皱、断裂构造致使铝土矿直接找矿标志和间接找矿标志大面积隐伏。通过对区内在次级长冲向斜核部发现的铝土矿地质特征等进行综合分析,认为直接运用向斜构造找矿标志,在该区范围内探索或发现深部隐伏铝土矿可获重大突破,增加铝土矿资源量具较大潜力。     

高温后地质聚合物混凝土损伤特性试验

采用矿渣和粉煤灰为原料,硅酸钠和氢氧化钠为激发剂,制备了矿渣粉煤灰基地质聚合物混凝土,通过超声波检测及抗压强度试验,研究了不同温度、不同冷却方式下SFGC的质量损失及力学、声学特性变化规律。结果表明,高温总体上导致SFGC的质量、抗压强度及纵波波速减小,峰值应变增大,频谱中高频成分衰减; 冷却方式对高温后SFGC的损伤演化具有显著影响,经浇水冷却后的试件较自然冷却情况性能退化更为严重; 600 ℃为SFGC性能突变的临界温度,600 ℃之后,其性能急剧劣化。     

浅谈重庆市涪陵区石漠化现状及其成因

重庆市涪陵区石漠化总面积272．42km2,集中分布于涪陵区乌江干流斜坡地带及其主要支流沿岸。石漠化是自然多重介质复杂环境和社会经济多重介质复杂环境共同作用的产物。从石漠化驱动力的来源划分,其成因大体可分为自然因素和人为因素两大类：     

我校在全国第三轮学科评估中成绩良好

2013年1月29日,教育部学位与研究生教育发展中心公布了全国第三轮学科评估结果。我校共有哲学、理论经济学、法学、社会学、马克思主义理论、中国语言文学、新闻传播学、考古学、中国史、世界史、数学、物理学、化学、地理学、地质学、生物学、科学技术史、生态学、统计学、电子科学与技术、计算机科学与技术、化学工程与技术、地质资源与地质工程、软件工程、中药学、公共管理、艺术学理论、戏剧与影视学、美术学等29个一级学科参加了此次评估。     

甘肃大草滩锑矿床地质特征及物质组成分析

通过研究大草滩锑矿成矿地质特征,分析了矿石物质组分特征,认为,大草滩锑矿床矿石矿物主要为辉锑矿、毒砂以及少量黄铁矿和自然银,脉石矿物主要为石英、钠长石、碳酸盐、泥质和少量的绿泥石、白云母等.矿石中有益组分主要为Sb,以细脉状、浸染状和团块状矿石为主,矿化程度较均匀,有害组分As、Cu、Pb、Zn等含量均较低.     

Making continental crust: The sanukitoid connection

The average continental crust possesses intermediate compositions that typify arc magmatism and as a result it is believed to have been created at ancient convergent plate boundaries. One possible mechanism for intermediate continental crust formation is the direct production of andesitic melts in the upper mantle. Sanukitoids, which characterize the Setouchi volcanic belt, SW Japan, include unusually high-Mg andesites （HMA）. They were generated by slab melting and subsequent melt-mantle interactions under unusual tectonic settings such as where warm lithosphere subducts into hot upper mantle. Such conditions would have existed in the Archean. Hydrous HMA magmas are likely to have solidified within the crust to form HMA plutons, which were then remelted to produce differentiated sanukitoids. At present, generation and differentiation of HMA magmas may be taking place in the Izu-Bonin-Mariana arc-trench system （IBM）, because （1） HMA magmatism characterizes the initial stages of the IBM evolution and （2） the IBM middle crust exhibits Vp identical to that of the bulk conti- nental crust. Vp estimates for plutonic rocks with HMA compositions support this. However tonalitic composition for middle-crust-forming rocks cannot be ruled out, suggesting an alternative possibility that the continental crust has been created by differentiation of mantle-derived basaltic magmas.     

SHRIMP U-Pb zircon age of tuff at the bottom of the Lower Cambrian Niutitang Formation,Zunyi, South China

A SHRIMP U-Pb zircon geochronology study of the tuff at the bottom of the Lower Cambrian Niutitang Formation at Songlin, Zunyi, South China yielded a mean ^206Pb/^238U age of 518±5 Ma. It is significantly younger than the Re-Os ages of 537--542 Ma for the overlying polymetallic Ni-Mo-PGE-rich layer in the basal Niutitang Formation at Songlin, suggesting that the Re-Os ages might represent that of the original magma chamber for the Ni-Mo-PGE-rich layer rather than the formation age of the strata. The intra-basinal stratigraphic correlation also implies that the absolute age of the Chengjiang biota should be younger than 518±5 Ma. Our new result, together with the SHRIMP U-Pb zircon age for the K-bentonite in the Zhongyicun member of the Zhujiaqing Formation at the Meishucun section, Yunnan Province, provides a temporal constraint for the Lower Cambrian of the Yangtze Platform in South China.     

盾构智能化姿态控制器的设计

在理论推导千斤顶推力的基础上,寻求工程历史数据的规律,得出地质条件与盾构推进千斤顶压力的关系.在控制器实时控制中,根据探地雷达探测得到的盾构前方的地质条件,控制器预设盾构各区千斤顶的压力值.引入模糊控制理论,根据自动测量系统测得的实时偏差量,通过模糊控制器得出千斤顶纠偏控制量.最后,综合推估推力和纠偏推力,最终实现盾构推进姿态的自动控制.