粤北地热资源遥感调查探测模式与应用

目前,地热资源勘查仍以传统的物探方法为主,这样在探测区地热宏观环境条件不明时,就会出现投资风险大或盲目开采的情况;而遥感对地热资源的探测是弥补这一不足的先进技术.本文利用陆地卫星遥感数据处理方法进行了有效的遥感地质解译,依据陆地卫星红外遥感数据所反映的地物辐射温度差异特点,对遥感影像进行波段差值运算、HIS(HLS)彩...     

Identification of the Early Jurassic mylonitic granitic pluton and tectonic implications in Namling area,southern Tibet

A number of studies revealed that the Gangdese magmatic belt of southern Tibet was closely related to the northward subduction of the Neo-Tethys oceanic lithosphere and Indo-Asian collision.However,pre-Cretaceous magmatism is still poorly constrained in the Gangdese magmatic belt,southern Tibet.Here,we conducted systematically geochronology and geochemistry studies on a newly-identified granitic pluton in the middle Gangdese magmatic belt(Namling area),southern Tibet.Zircon SHRIMPⅡU-Pb dating for one representative sample gives a weighted age of 184.2±1.8 Ma(MSWD=±1.11),corresponding to emplacement and crystallization age of the granitic pluton in the Early Jurassic(Pliensbachian).High SiO2(68.9-72.1 wt.%)contents and intermediate Mg#values(35-38)together suggest that the newly-identified granitic pluton was probably formed by partial melting of crustal material with minor injection of mantle-derived magma,precluding an origin from melting of metasedimentary rocks that are characterized by low Mg#and high zirconδ^18O values(>8‰).Geochemically,the newly-identified granitic pluton belongs to typical I-type granitic affinity,whereas this is inconsistent with aluminium saturation index(ASI=A/CNK ratios)and geochemical signatures.This suggests that zircon oxygen isotopes(4.30‰-5.28‰)and mineral features(lacking Al-rich minerals)are reliable indicators for discriminating granitic origin.Significantly depleted whole-rock Sr-Nd-Hf isotopic compositions and zirconεHf(t)values indicate that the granitic pluton was derived from partial melting of depleted arc-type lavas.In addition,the granitic pluton shows zirconδ^18O values ranging from 4.30‰to 5.28‰(with a mean value of 4.77‰)that are consistent with mantle-derived zircon values(5.3‰±0.6‰)within the uncertainties,indicating that the granitic pluton might have experienced weak short-living high-temperature hydrous fluid-rock interaction.Combined with the Sr-Nd-Hf-O isotopes and geochemical signatures,we propose that the newly-identified granitic pluton was originated from partial melting of depleted mafic lower crust,and experienced only negligible wall-rock contamination during ascent.Integrated with published data,we also propose that the initial subduction of the Neo-Tethys oceanic lithosphere occurred no later than the Pliensbachian of the Early Jurassic.     

近地层大气折光系数的新反演法

以近地层大气垂直折光系数的传统反演方法和理论计算模型为基础,提出了一种可以直接利用对向EDM三角高程测量结果计算往测与返测折光系数的新反演方法。运用该方法时,不需要增加外业工作量,只需通过联合求解传统反演式和理论计算式,便可求得相对可靠的折光系数值,从而有效提高EDM三角高程测量的精度。     

阿西金矿床流体成矿的元素地球化学界面及X荧光测量识别试验

阿西金矿床元素地球化学界面的形成,是由区域地球化学高背景场和成矿流体作用的结果,其识别标志有岩石组合标志,构造变异标志和蚀变分带标志,同时,对Ｘ荧光测量方法识别元素地球化学界面的标志进行了有效性试验研究,效果良好。     

肾外伤的CT诊断

２０例肾外伤病人ＣＴ将其分为三型。轻型：肾挫伤,肾内血肿;中型：肾撕裂伤;重型：肾完全性断裂或粉碎。ＣＴ检查的优点为完全,迅速、能准确显示腹部解剖,肾外伤程度及腹部合并伤,为临床诊治提供可靠信息,ＣＴ诊断效果优于ＩＶＰ及ＶＳ。     

吉林省松原市国土资源电子政务建设

本文以松原市国土资源局"以国土资源电子政务建设省级试点项目"为实例,分析了项目的总体目标和设计,详细地阐述了所采用的关键技术,具体地论述了数据中心和三大平台的建设,概述了项目建设的保障措施,并就今后的工作重点作了进一步的说明。     

嫦娥五号探测器月面采样封装任务的定位精度

嫦娥五号是中国首个实施无人月面取样返回的月球探测器。为了确保采样封装任务的定位精度,需要对采样封装任务进行高精度的整体几何检校。本文提出了附有立体约束和机械臂运动约束条件的联合平差检校模型。经过内场试验验证本文提出的检校方法具有较高的精度。在模拟采样试验中能够获得5.118 mm的平均定位误差,在月面采样任务中能够获得4.745 mm的平均定位误差。有效保障了嫦娥五号探测器精准地完成月面自动采样封装任务。     

钢管混凝土组合柱变形能力计算方法

为研究钢管混凝土组合柱的变形能力,建立了屈服曲率和极限曲率的计算式。屈服曲率与受拉纵筋的屈服应变、柱截面高度、轴压比、配箍特征值和钢管含管特征值有关,极限曲率与柱截面高度、轴压比、配箍特征值和含管特征值有关。通过对58个组合柱试件试验数据分析,得到了计算式的相关参数,由此可计算组合柱的屈服位移角和极限位移角,计算结果与试验结果符合良好。     

中国东北区前寒武纪地层

对中国东北区前寒武纪地层进行了初步总结，建立了前寒武纪地层序列，提出了佳木斯地块，大兴安岭地块和锡林浩特中间地块具有相近的演化历史，均以克拉通为生长点，通过垂向和侧向增生，形成了区别于华北板块和西伯利亚板块的中间地块新认识。     

局域热源强迫和大尺度流型的长期演化

积分时间达 7个模式月的 3组试验表明 :在一定的参数条件下 ,局域热源强迫的引进可以激发出大尺度流型的全局调整 ,即从一个两槽两脊的流型转换为一个一槽一脊的流型。局域热源的强度、范围和纬度位置 ,对大尺度流型长期演化特征 ,均具有重要影响。