甘肃花牛山喷流沉积型金银铅锌矿床控矿因素与找矿前景分析

花牛山银铅锌矿床过去大多研究者认为其形成与印支期花岗岩有关。但矿床地质特征、矿化类型及成矿年代学研究表明,花牛山银铅锌矿床是中元古代晚期古火山喷流沉积作用的产物。本文在分析论述矿区喷流沉积型贵重-有色金属系列矿化成矿作用特点和成矿规律的基础上,系统归纳总结了矿床主要控矿因素与找矿标志。并按照层控找矿思路,结合地质及物探工作资料,指出了今后开展接替资源勘查的找矿靶区。     

铬—邻菲啰啉—亚硝酸钠—溴化十六烷基三甲铵体系的极谱催化波

本文提出邻菲口罗啉—亚硝酸钠—溴化十六烷基三甲铵测定铬的新体系。在０．２４ｍｏｌ·Ｌ－１ＮａＮＯ２－１．２×１０－５ｍｏｌ·Ｌ－１Ｏ－Ｐｈｅｎ－４．８×１０－５ｍｏｌ·Ｌ－１ＣＴＭＡＢ（ｐＨ９．３）底液中,Ｃｒ（Ⅵ）于－１．４０Ｖ（Ｖｓ：ＳＣＥ）产生一灵敏、尖锐、稳定的极谱波。Ｃｒ（Ⅵ）浓度在０～６０μｇ·Ｌ－１范围内与峰电流呈良好的线性关系。用本法测定了水样及钢样中痕量铬,结果良好。本文还对极谱波的性质进行了初步探讨。     

试用多层递阶回归分析法作月降水预报

通过对多层递阶回归分析方法的试用,表明这种方法在预报业务中有实用价值。     

含水率变化对深部工程岩体蠕变规律的影响

针对地下工程岩体随着深度、含水状态的变化将表现出流变变形的现象,通过对深部围岩蠕变规律进行探讨,并基于工程流变力学理论和渗流力学理论,对含水率的变化对软岩蠕变变形规律及本构方程的影响进行了研究,结果表明含水率是影响岩石蠕变变形非线性程度的重要因素。     

Recent advance in study of K-Pg boundary in Jiayin of Heilongjiang,China and its adjacent area

The non-marine Cretaceous-Paleogene boundary ( KPgB) in Jiayin of Heilongjiang was first defined and reported in China by the authors' research team in 2011 . Thereafter the continuous research on the KPgB and its related Late Cretaceous biota in Jiayin has been made by the authors in 2012-2020 . The achievements of the research are mainly reflected as follows:(1) a new drilling borehole with 60 m in depth carried out in the Xiaoheyan of Jiayin in 2016 , supplemented new palynological evidence for the KPgB definition in 2011;( 2 ) some radiometric dating newly made on the strata related to the KPgB in Jiayin and its neighboring Russian area, provided the supplemental evidence for the KPgB definition in Jiayin;( 3 ) many new fossils found by the au-thors, represented by the angiosperms Dalembia and Nelumbo, refresh understanding the Late Cretaceous envi-ronment of Jiayin;and (4) the TEM method is applied in the study of pollen exine ultrastructure of Pseudoin-tegricorpus, Wodehouseia, and Aquilapollenites, promoting the late Maastrichtian ecological study in Jiayin, re-lated to the KPgB.     

辽河群变质岩稀土元素地球化学

辽河群变质岩主要由片岩、大理岩、变粒岩、浅粒岩和板岩等十大岩类组成。主要岩石稀土元素组成具有变沉积岩的稀土分配特征。片岩和大理岩、变粒岩和浅粒岩的原岩主体为沉积岩,个别为火山岩,它们主要来源于大陆上部地壳;部分属上地幔或接近于大陆溢流玄武岩的物质经部分熔融的产物。     

图像全站仪的任意星全盲识别算法

准确可靠的任意星识别是快速自动天文定位定向测量和数据处理的关键.提出一种基于图像全站仪测量的任意星全盲识别算法.任意选取3颗亮星组成匹配三角形,分别对三星连续拍照获得短时序的水平角和高度角,线性拟合并归算至同一时刻的地平坐标,采用三角形匹配法进行识别.大量野外观测数据测试表明,若拟合外推时间不超过4 min,连续星和间...     

Linkage between permafrost distribution and river runoff changes across the Arctic and the Tibetan Plateau

River runoff in the Arctic and the Tibetan Plateau(TP) change significantly in recent decades. However, the mechanisms of the physical processes of permafrost river runoff change remain uncertain across large scale. This study investigated the mainstreams and tributaries of main Arctic and TP rivers dominated by permafrost and assessed the linkage between hydrological regime change and permafrost. The results show that the effects of permafrost on river runoff are highly dependent on the permafrost coverage of a watershed. For the past decades, the majority of the Arctic and TP basins showed increased discharge, while all of the studied basins showed increased baseflow, with faster increasing speed than total discharge.Both total discharge and baseflow annual change rate(ΔQ and ΔBF) increased with permafrost coverage, indicating the increments of streamflow are enhanced with high permafrost coverage. Meanwhile, the annual change of precipitation showed weak connection with total discharge and baseflow change. The high permafrost coverage basins showed high annual maximum/minimum discharge ratio(Qmax/Qmin), while the Qmax/Qminchanged slightly in low permafrost cover basins. Our results highlight the importance of permafrost coverage on streamflow regime change for permafrost basins across the northern hemisphere. Due to these linkage between permafrost extent and runoff regime change and the increasing changes of permafrost, more attention should be paid to the change of hydrological processes in permafrost-underlain basins.     

计算结构首次穿越时间概率密度函数的新方法

本文在M adsen等提出的积分方程方法基础上,采用单点FORM方法计算结构首次穿越问题中的条件穿越率、联合穿越率及首次穿越时间概率密度。提出的新方法计算简单,结果精确,适于进行脆性结构的首次穿越破坏分析。     

地理空间数据资源共享交换平台建设初探

地理空间数据资源是国家重要的信息资源和战略资源,利用基础地理空间信息数据,集成和整合与地理空间位置有关的社会经济发展需要的信息数据对推进信息化建设、防止"信息孤岛"及重复投入具有十分重要的意义。本文论述了新疆地理空间数据资源共享交换平台的初期建设情况,通过该平台的建设可以实现全疆地理空间数据资源的跨部门共享交换和开发利用,对于加快新疆地理空间数据资源开放共享机制建立健全的步伐有积极作用。