黑龙江依兰地区变玄武岩及变堆晶辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义

对依兰地区黑龙江混杂岩中的变玄武岩、变枕状玄武岩及变堆晶辉长岩岩块中的锆石进行了LA-ICP-MS U-Pb同位素测定,结果表明,变玄武岩的锆石大量为捕获基底的锆石,其年龄范围大,从3172±24Ma到176±1Ma均有分布,其中具有基性岩典型的板状特征的锆石年龄为243±1Ma,代表了变玄武岩的原岩形成年龄;变枕状玄武岩及变堆晶辉长岩的年龄分别为251±1Ma和252±1Ma,分别代表各自原岩的形成年龄。本次锆石年龄的获得,证明晚二叠世佳木斯地块和松嫩-张广才岭地块之间存在古洋盆,为研究黑龙江杂岩的演化历史提供了重要的年代学依据。     

基于贝叶斯原理的爆炸识别判据综合技术研究

基于贝叶斯原理,建立了地震事件识别判据的综合方法（简称贝叶斯方法）, 并针对中亚地区大量地震事件,采用该方法综合了不同台站和不同频带的P/S震相幅值比判据. 该方法的主要优点是能够给出事件属于爆炸的概率,而且充分考虑了判据之间的相关性. 理论计算和模拟数据分析结果表明, 贝叶斯方法是最优的综合方法, 其识别效果比任何单个判据好,也好于普通线性组合方法的识别效果. 针对中亚地区大量地震事件综合不同台站和不同频带的P/S震相幅值比判据的结果也表明,贝叶斯方法的误识率低于单个判据和线性组合方法的误识率.     

江苏省旅游经济重心演进格局及其驱动机制

运用重心模型,定量分析了2001—2012年江苏省旅游经济时空格局的演进过程。江苏省旅游外汇收入重心持续北上,国内旅游收入重心则先南下、后北上,旅游总收入重心的演化路径与国内旅游收入较为相似;江苏省旅游外汇收入重心、国内旅游收入重心和旅游总收入重心都明显偏离几何中心,但呈缓慢趋同态势;旅游外汇收入重心与入境旅游客流重心、国内旅游收入重心与国内旅游客流重心、旅游总收入重心与旅游客流总量重心均呈现出显著的空间分离特征。从资源开发、政策支持、经济基础、对外开放和事件影响等方面深入剖析了江苏省旅游经济重心移动的驱动机制。旅游资源的开发利用是旅游经济重心移动的关键驱动因素,政府的区域发展政策是旅游经济重心移动的直接驱动因素,经济发展的区域格局及其变化促进旅游经济重心的移动,对外开放的全面推进成为旅游经济重心移动的助推剂,重大事件驱动旅游经济重心变化趋势发生短暂性偏离。     

A novel technique for automatic seismic data processing using both integral and local feature of seismograms

A novel technique for automatic seismic data processing using both integral and local feature of seismograms was presented in this paper. Here, the term integral feature of seismograms refers to feature which may depict the shape of the whole seismograms. However, unlike some previous efforts which completely abandon the DIAL approach, i.e., signal detection, phase identification, association, and event localization, and seek to use envelope cross-correlation to detect seismic events directly, our technique keeps following the DIAL approach, but in addition to detect signals corresponding to individual seismic phases, it also detects continuous wave-trains and explores their feature for phase-type identification and signal association. More concrete ideas about how to define wave-trains and combine them with various detections, as well as how to measure and utilize their feature in the seismic data processing were expatiated in the paper. This approach has been applied to the routine data processing by us for years, and test results for a 16 days’ period using data from the Xinjiang seismic station network were presented. The automatic processing results have fairly low false and missed event rate simultaneously, showing that the new technique has good application prospects for improvement of the automatic seismic data processing.     

P/S震相幅值比判据对低震级地震事件的适用性检验c

基于中国新疆及中亚地区大量天然地震和地下爆炸,检验了较大震级情况下得到的区域P/S震相幅值比识别判据对低震级地震事件的适用性. 分析结果表明,对较大震级地震事件具有较好识别效果的P/S震相幅值比判据对低震级事件同样适用,而且对低震级事件也具有与较大震级事件大致相当的识别效果. 据WMQ、BLK、MUL和MAK台的25个识别效果较好的P/S震相幅值比判据统计, 大于ML3.5和ML3.5以下地震事件的误识率之差约为2个百分点.     

某沥青铀矿石堆浸性能的研究

简要介绍了铀矿床的类型和铀矿石的分选方法,重点介绍了某火山岩型铀矿床硬岩类原生沥青铀矿石的实验室溶浸试验。试验结果表明,该沥青铀矿石在用天然铁锰矿石为氧化剂的条件下,经过123d实验室溶浸试验,铀浸出率可达78.92%。     

夯实地基土的微结构特性及其对工程性质的影响

通过对地基土强夯前后的微观结构进行研究 ,从微结构角度解释了强夯时地基土的变形破坏机理。世纪花园高饱和度地基土由于存在粘粒及集聚体 ,强夯后使土的渗透性变差 ,超孔隙压力难以快速消散 ,致使土发生变形破坏。     

The Cu-Mo Mineralization of the Late Jurassic Porphyry in the Northern Great Xing’an Range: Constraints from Zircon U-Pb Ages of the Ore-Causative Granites

The Great Xing’an Range(GXAR)is one of the most important metallogenic belts in China.Previous study has shown that porphyry Cu-Mo deposit distributed in the northern Great Xing’an Range formed mainly in two stages:(1)Early Ordovician,such as Duobaoshan and Tongshan deposits(Liu et al.,2017);2)Triassic-Early Jurassic,including Wunugetushan,Taipingchuan and Badaguan deposits(Tang et al.,2016).In recent years,two potential porphyry Cu-Mo deposits,Huoluotai and Xiaokele,were discovered in the Erguna Block,northern GXAR(Figs.1a–b).However,the ore formation ages and regional metallogenic regularity are ambiguous due to the lack of isotopic ages.Two zircon U-Pb ages from the ore-causative granites were reported in this paper,with the aims to constrain the metallogenic ages and provide evidence for study of the regional metallogenic regularity and ore prospect prediction.     

基于克里金方法的区域震相走时标定技术研究div.

在台网比较稀疏的情况下,台站走时标定是提高低震级事件定位、识别能力的重要手段．为了提高稀疏台网的定位精度,首先利用标定事件和IASPEI1991走时表以及中国大陆走时表,计算了初至P波和Lg波到AAK,MAKZ,NIL,TLG以及WMQ等5个台站的走时残差;接着,采用非平稳贝叶斯克里金方法和走时残差数据构造上述台站的走时校正曲面;最后,通过加入和不加入走时校正定位一系列位置准确的发生在新疆地区的地震事件评估克里金走时校正的有效性．结果表明,克里金走时校正能够较大地提高稀疏台网的定位精度,同时有效地缩小误差椭圆的面积．      

Morphology,trace elements,and geochronology of zircons from monzogranite in the Northeast Xing’an Block,northeastern China: constraints on the genesis of the host magma

Mineralogy and Petrology - The morphology, trace-element composition and geochronology of 43 zircon grains from two monzogranite samples from the Northeast Xing’an Block, northeastern China,...