格尔木井水温异常特征及其与地震关系分析

简要介绍了格尔木井水温动态观测的环境与条件,在研究正常动态特征和影响因素的基础上,对水温异常的映震关系进行了分析,并成功地进行了一次短临地震趋势预测。探讨了水温异常的形成原因。     

环境蠕变对农业病虫草鼠害的潜在影响

重点讨论了在全球气候变暖的大背景下,农业病虫草鼠害加重和新的病虫草鼠出现也作为一种蠕变现象正在遭受气候变化的影响和冲击。其主要表现在农业有害生物(病、虫、草、鼠)地理分布范围扩大、越冬界限北移、农田害虫害鼠发育时间缩短、繁殖代数增加、种群增长率加快、发生提早、危害加重、病毒病增加、新病虫草鼠出现等等。     

T213数值预报产品在2003年宁夏首场透雨天气过程中的应用分析

2003年5月5～6日,宁夏出现了入春以来第一场透雨天气过程,本文利用常规天气资料和T213数值预报产品,对此次降水天气过程从主要影响系统和T213数值预报有关物理量预报场等方面进行分析发现,T213对我区降水有很好的预报能力和指示意义,并随着预报时效的缩短,其可信度在不断提高。     

Attribution of Persistent Precipitation in the Yangtze–Huaihe River Basin during February 2019

In February 2019, a month-long persistent precipitation event occurred in the Yangtze–Huaihe River basin. The geopotential height field that affected the duration of this frontal rainfall was divided into a high-latitude part and a lowlatitude part for analysis. In the high-latitude part, a two-wave structure led to quasi-stationary circulation, and the change of both the blocking high pressure and Arctic Oscillation phase caused cold air to invade South China continuously and changed the fronta...     

煤层显微煤岩类型与裂隙分布的关系

综合利用显微地层学和统计学方法,以河东煤田中北部8^#煤层为例,研究了煤层显微煤岩类型与煤层裂隙分布的关系。结果表明,裂隙在不同显微煤岩类型煤体中的分布存在较大的差异,同时裂隙分布的位置与显微煤岩类型的组合序列有关。其结果对煤层气资源评价和煤层渗透性预测具有重要的指导意义。     

新疆尾亚—天湖地区花岗岩类剥蚀程度估算及对区域找矿的启示

尾亚—天湖地区位于新疆中亚造山带东南部的中天山地块内,晚古生代—中生代岩浆活动强烈,产出了战略性关键矿产尾亚钒铁磁铁矿.在详细岩相学观察的基础上,对尾亚、天湖和沙泉子南岩体中的角闪石和黑云母进行了电子探针(EMPA)测试分析,限定了 3个岩体结晶的温压条件、氧逸度、含水量和含铁指数等要素,为解析中天山地块的岩浆-成矿物...     

青藏高原康西瓦—狮泉河地区1∶100万区域重力调查成果与进展

提供岩石磁性参数统计表、各地层岩石密度统计表和布格重力异常图,并做初步分析。     

胶东西北部地区金矿床铅同位素特征及其地质意义

胶东地区不同类型金银、铅锌矿床及交代—深熔花岗岩三者的铅同位素特征相似,皆为来自铀针亏损型源区的多阶段铅。在Pb~(207)/Pb~(204)-Pb~(206)/Pb~(204)图解上,它们的投影点可拟合成一条直线。据此,并根据大量的K-Ar、U-Pb、Rb-Sr和Ar~(30)-Ar~(40)年龄数据,得t_1=3.2Ga,t_2=0.15Ga,μ_1=7.07～8.17,W_1=29.16～35.80,Th/U=3.97～4.52。矿石铅与胶东群变质岩岩石铅同位素统计对比表明,金银、铅锌和交代—深熔花岗岩中的铅皆来自再活化的下地壳源铅。     

Tectonic Units and Their Fundamental Characteristics on the Northern Margin of the Alxa Block

The northern margin of the Alxa block is the junction of a tectonic units. Four first-order tectonic units are distinguished: 1. the Yagan structural zone characteristic of an immature island arc; 2. the Zhusileng-Hangwula structural zone, which was a passive continental margin in the Early Palaeozoic and was transformed into an active continental margin in the Late Palaeozoic;3. the Shalazha structural zone characteristic of a mature island arc; 4. the Nuru-Langshan structural zone, which was a Proterozoic orogenic belt and later evolved into an extensional transtional crust in the Palaeozoic. The above-mentioned tectonic units differ remarkably in sedimentary formations, magmatic rock associations, metamorphism and geochemistry and are bounded by faults between one another.