以扎木曲多金属矿为例浅谈地球化学勘查在唐古拉山地区找矿的有效性     

商建  ;张文旭  ;张坤  ;王洪庆 《矿产与地质》2014,(3):340-345

扎木曲多金属矿位于唐古拉山北坡,长江源头的沱沱河一带。1/20万地球化学测量在该区圈定AS4甲1HgCu综合异常一处,对该综合异常作1/5万水系沉积物加密测量,将其分解为AS4-1~AS4-5五个子异常,进一步浓缩了找矿靶区。对分解后的重点子异常AS4-3采用土壤测量控制异常浓集中心部位,圈定了一条土壤元素组合异常带,异常重现性好,面积大,元素含量值显著提高。通过对土壤异常带作工程验证并圈出铅矿体9条。为此,地球化学勘查在本区寻找多金属矿是行之有效的,这为在唐古拉山地区寻找多金属矿产提供参考。  相似文献   

“00.7”北京特大暴雨模拟中气象资料同化作用的评估   总被引：18，自引：0，他引：18  

张朝林  Kuo Ying Hw  范水勇  仲跻芹 《气象学报》2005,63(6):922-932

针对2000年7月4～5日北京地区的一次特大暴雨过程(24 h降水量达240 mm),文中利用MM5/WRF三维变分系统和MM5非静力模式,对此次特大暴雨过程中的各种气象监测资料(地基GPS大气柱水汽含量、常规探空、高空测风、地面常规观测和地面自动气象站)的同化作用通过观测系统数值试验进行了评估.结果表明与传统的客观分析方案相比较,MM5/WRF三维变分同化系统可直接引入非常规地基GPS大气柱水汽含量监测资料,提供更好的大气初始分析场.在三维变分同化方案下,各种大气监测资料均对改进此次特大暴雨模拟有不同程度的贡献,其中,常规探空和高空测风监测资料对改进预报结果的影响最大,地面常规观测和地面自动气象站观测资料作用次之,地基GPS大气柱水汽含量资料在与其他大气监测资料相互优势互补后,可很好地改善模式大气的分析质量,通过三维变分同化技术在区域数值天气预报模式初始场中引入地基GPS大气水汽监测网资料,使此次强降水个例的6 h和24 h测站降水预报的TS评分值在1,5,10和20 mm预报检验阈值下分别提高了1%～8%.研究结果对利用三维变分数值系统,评估气象监测网资料在改进高影响天气事件预报中的作用有借鉴意义.  相似文献   

A mechanism for anomalous decline in radon precursory to an earthquake     

Kuo MC  Fan K  Kuochen H  Chen W 《Ground water》2006,44(5):642-647

Mechanisms for interpreting anomalous decreases in radon in ground water prior to earthquakes are examined with the help of a case study to show that radon potentially is a sensitive tracer of strain changes in the crust preceding an earthquake. The 2003 Chengkung earthquake of magnitude (M) 6.8 on December 10, 2003, was the strongest earthquake near the Chengkung area in eastern Taiwan since 1951. The Antung radon-monitoring station was located 20 km from the epicenter. Approximately 65 d prior to the 2003 Chengkung earthquake, precursory changes in radon concentration in ground water were observed. Specifically, radon decreased from a background level of 780 pCi/L to a minimum of 330 pCi/L. The Antung hot spring is situated in a fractured block of tuffaceous sandstone surrounded by ductile mudstone. Given these geological conditions, we hypothesized that the dilation of brittle rock mass occurred at a rate faster than the recharge of pore water and gas saturation developed in newly created cracks preceding the earthquake. Radon partitioning into the gas phase may explain the anomalous decrease of radon precursory to the 2003 Chengkung earthquake. To support the hypothesis, vapor-liquid, two-phase radon-partitioning experiments were conducted at formation temperature (60 degrees C) using formation brine from the Antung hot spring. Experimental data indicated that the decrease in radon required a gas saturation of 10% developed in rock cracks. The observed decline in radon can be correlated with the increase in gas saturation and then with the volumetric strain change for a given fracture porosity.  相似文献   

3-D Storm Automatic Identification Based on Mathematical Morphology          下载免费PDF全文

韩雷  郑永光  王洪庆  林隐静 《Acta Meteorologica Sinica》2009,23(2):156-165

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基于静止卫星红外云图的MCS普查研究进展及标准修订          下载免费PDF全文

费增坪  郑永光  张焱  王洪庆 《应用气象学报》2008,19(1):82-90

基于静止卫星红外云图的MCS普查标准不统一不利于各种MCS普查结果的对比分析, 该文在总结MCS普查研究进展的基础上, 依据Orlanski尺度分类标准对MβCS普查的最小尺度标准作了修订, 即修订为TBB≤-32 ℃的连续冷云区直径≥20 km。根据马禹等的MβCS普查标准和该文修订的MβCS普查标准, 利用GOES-9卫星红外云图普查了2003年6月19日—7月22日淮河大水期间的MCS, 结果发现共有10个MαCS和24个MβCS, 并对24个MβCS作了普查标准修订前后的统计结果对比, 发现新的普查标准比根据马禹等的MβCS普查标准获得的结果多7个MβCS, 并且这7个MβCS中有6个都引起强降水, 因此这种对比分析结果表明:新MβCS普查标准对揭示淮河大水和MCS的关系更具合理性。此外, 还分析了3个因MβCS而引起局地强降水的典型个例, 这些MβCS的直径尺度只有几十至一百多公里, 不符合马禹等的MβCS普查标准。对这3个MβCS分析结果表明:该文新MβCS普查标准有助于对产生剧烈天气的MCS的普查研究和预报。  相似文献   

Melt Events in A Nascent Mantle Wedge: Implication from the Luobusa Ophiolite,Tibet     

TUNG Kuo’an  YANG Houngyi  YANG Huaijen  ZHANG Jianxin  LIU Dunyi  LI Xianhwa 《《地质学报》英文版》2019,93(Z2):49-50

The compositions of minerals and whole rocks of the Luobusa ophiolite in South Tibet, a fragment of Neo‐Tethyan forearc lithosphere, is used to investigate the magmatic evolution of nascent mantle wedges in newly‐initiated subduction zones. Clinopyroxenes in the Luobusa peridotites all have diopsidic compositions, and their Al₂O₃ contents vary from ～ 2% in the dunites and refractory harzburgites to 2‐4% in the cpx‐bearing harzburgites. The REE of clinopyroxenes in the harzburgites have left‐sloping patterns with contents comparable to those in abyssal peridotites that have experienced 5‐15% partial melting. Chromites in the Luobusa chromitites have the highest Cr#s (～ 80) and TiO2 contents (0.1‐0.2%), and those in the cpx‐bearing harzburgites have the lowest Cr#s (20‐60) and TiO2 contents (0‐0.1%), whereas those in refractory harzburgites and dunites have intermediate compositions. Cpx‐bearing and refractory harzburgites show spoon‐and U‐shaped REE patterns, respectively, and their HREE distribution patterns suggest at least 15%‐ 20% partial melting. The REE patterns of dunites and high‐Cr chromitites vary from spoon‐ to U‐shaped and require 15‐30% partial melting in their mantle sources to produce their parental melts. Our dataset reveals that the nascent Luobusa mantle wedge was first infiltrated by slab‐derived fluids and later refertilized by transitional lava‐like melts, resulting in cpx‐bearing harzburgites. Partial melting in the deeper cpx‐bearing mantle generated high‐Ca boninitic to arc picritic melts, which interacted with the peridotites in the uppermost mantle to generate high‐Cr chromitites, dunites and some refractory harzburgites. Lithological variation from cpx‐bearing to refractory harzburgites in forearc ophiolites is the result of multi‐stage melt events rather than increasing degrees of partial melting. Intermittent slab rollback during subduction initiation induces asthenospheric upwelling and high heat flux in nascent mantle wedges. Elevated geothermal gradients play a more important role than slab dehydration in triggering Mg‐rich magmatism in newly‐initiated subduction zones.  相似文献   

桂枝茯苓胶囊化学成分研究(Ⅲ)     

杨鹏飞  王振中  王洪庆  李家春  陈若芸 《干旱区地理》2011,43(4)

目的 对桂枝茯苓胶囊内容物正丁醇和水萃取部位化学成分进行研究.方法 采用硅胶柱色谱、Sephadex LH-20、D-101型大孔树脂和反相RP-18柱色谱等方法进行分离纯化,利用MS和NMR等波谱学方法鉴定化合物的结构.结果 分离鉴定了16个化合物,分别为氧化芍药苷(1)、半乳糖醇(2)、咖啡酸(3)、牡丹皮苷F(4)、去氢土莫酸(5)、猪苓酸C(6)、3-表去氢茯苓酸(7)、3-表去氧土莫酸(8)、海藻糖(9)、鸟苷(10)、腺苷(11)、丙氨酸(12)、亮氨酸(13)、脯氨酸(14)、精氨酸(15)、α-D-葡萄糖(16).结论 化合物1～16均为首次从该复方中分离得到.  相似文献   

1998年6月8～9日香港特大暴雨中尺度对流系统分析   总被引：14，自引：4，他引：10  

孙健  刘淑媛  陶祖钰  王洪庆 《大气科学》2004,28(5):713-721

利用卫星和多普勒雷达的高时空分辨率观测资料,对1998年6月8～9日香港暴雨过程中的中尺度对流系统进行分析,表明:(1)此次暴雨是冷锋前暖区的对流性降水,期间有3次强降水过程,每次维持时间2～5小时,中尺度对流系统是造成强降水的主要系统.(2)雷达回波强度与卫星云图对比发现,强回波区全位于云顶温度≤-32℃的云团内,但具体分布有两种情况:一种强回波区位于通常所说的发展强盛的α中尺度云团的边缘TBB等值线密集区,一种如尺度较小的线状强回波则位于两个β中尺度云团(云顶温度≤-52℃)之间.这利用常规观测资料是无法识别的.(3)分析单多普勒雷达反演的水平风场发现:大尺度的环境风场中,存在β中尺度系统的独立流场;中尺度云团内部的流场辐合与强回波带相对应.  相似文献   

利用H/V谱比法辨识场址非线性反应(英文)     

温国梁  J Y Huang  H J Hsu  C M Lin  C H Kuo 《国际地震动态》2010,(6):33-34

The horizontal-to-vertical spectral ratio has become popular in studies of the site effect and the determination of the predominant period of a site.  相似文献   

云阳县滨江大道路基挡土墙变形分析与加固          下载免费PDF全文

王洪庆  严译强  马健 《探矿工程》2012,39(2):70-73

云阳县滨江大道路基挡土墙在运营工况下,由于路基运营环境的变化导致了填土的物理力学性质的改变,挡土墙发生了位移和变形。在分析了变形原因的基础上,提出了抗滑桩预应力锚索联合加固方案,并取得了良好的治理效果。介绍了该工程加固方案设计及抗滑桩预应力锚索施工工艺。  相似文献