Methodology for in situ wolframite U-Pb dating and its application     

Yueheng YANG  Ming YANG  Hao WANG  Jinhui YANG  Fuyuan WU 《中国科学:地球科学(英文版)》2021,64(1):187-190

Tungsten(or wolfram,W),one of the crucial metal sources,is widely used in electronics,oil,chemical and military industries.China owns abundant tungsten resources(~60%of the world reserves and~80%of the world’s production),of which the area from Southern Jiangxi-Northern GuangdongSouthern Hunan is the most significant ore belt in south China.Understanding ore genesis and distribution as well as the process of fine mineralization will further benefit the prospecting and exploration of tungsten deposits.The accurate determination of the age of mineralization is at the front line in the study of ore deposit and the premise for solving and understanding the above problems.  相似文献   

Gold mineralization age of the Anjiayingzi gold deposit in Chifeng County,Inner Mongolia and implications for Mesozoic metallogenic explosion in North China   总被引：4，自引：0，他引：4  

LI Yonggang  ZHAI Mingguo  YANG Jinhui  MIAO Laicheng & GUAN HongInstitute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China Correspondence should be addressed to Li Yonggang 《中国科学D辑(英文版)》2004,47(2):115-121

The Anjiayingzi gold deposit in Chifeng County, Inner Mongolia is located in the central part of the gold mineralization belt of the northern margin of the North China Craton (NCC), and is adjacent to the Paleozoic Inner Mongolia-Da Hinggan Mountains orogenic belt in the north. The Chifeng-Kaiyuan fault, which separates the NCC from this orogenic belt, is considered to be a regional ore-controlling structure. The Anjiayingzi gold deposit is a mediate-size quartz lode-gold deposit and is hosted by the Anjiayingzi quartz monzonite that was emplaced into the basement composed of early Precambrian gneisses. Rhyolitic and porphyritic dikes are generally associated with the gold mineralization. Zircon U-Pb analyses suggest that the Anjiayingzi granite was emplaced from 132 Ma to 138 Ma, while the rhyolitic dikes that occupy the same fracture system as the gold-bearing quartz veins and locally crosscut the gold lodes crystallized from 125 Ma to 127 Ma. These results constrain the mineralization age between 126  相似文献   

用K—L变换处理全波列声测井资料     

陶春辉  何樵登 《海洋学研究》1996,14(3):8-12

本文运用滤波和Ｋ－Ｌ变换对全波列声测井数据进行处理。滤波能去掉某些高、低频噪音；Ｋ－Ｌ变换，能削弱相干或不相干的噪音，分离或去掉各种波型，以加强Ｓ波信噪比。  相似文献   

华南海岸带陆海相互作用研究   总被引：1，自引：0，他引：1  

戴志军  李春初  陈锦辉 《地理科学进展》2004,23(5):10-16

全球环境变化背景下,海岸带陆海相互作用的重点应该放在地球系统的重要界面－海岸带。结合国外海岸带陆海相互作用研究,对我国华南海岸带历史与现代陆海相互作用研究的现状与问题进行较为详细的评述,并就华南海岸带开展陆海相互作用应研究的主要内容及趋势进行了探讨。  相似文献   

复杂山区三维地震勘探野外施工方法     

王晶  姜飞  李京涛  李金辉  陶二勇 《山东地质》2014,(1):48-50

三维地震勘探项目野外复杂的地表情况直接影响地震资料的采集难度和采集质量。通过对河南、内蒙古、新疆、山西等多个省份难度高的复杂山区野外项目现场实际施工经验分析,总结出一些针对复杂山区野外施工的特殊方法,可以有效的降低野外施工成本,提高野外施工效率和质量。  相似文献   

Isolation and degradation ability of the DDT-degrading bacterial strain KK   总被引：1，自引：1，他引：0  

Hui Xie  Lusheng Zhu  Qifeng Xu  Jun Wang  Wei Liu  Jinhui Jiang  Yan Meng 《Environmental Earth Sciences》2011,62(1):93-99

A 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane (DDT)-degrading bacterium was isolated from soil samples that had been enriched with DDT over a prolonged period of time; these samples were collected from the sewer sludge of a pesticide factory and from DDT-contaminated fields. This consortium was acclimated by repeated passage through a mineral salt medium containing increasing concentrations of DDT. We examined the effects of various factors such as the pH, temperature, concentration of DDT, and the presence of an additional carbon source on the degradation rate of DDT. Based on the analysis of the phenotype, physiological and biochemical characteristics, and 16S rDNA, the strain KK was identified to belong to the bacteria Alcaligenes. The results showed that at the end of 10 days, the rate of degradation of DDT by the strain KK was 66.5%. When the additional carbon source concentration, pH, concentration of DDT, and cultivation temperature is 0.5%, 6, 10 mg l⁻¹, and 30°C, respectively, the biodegradation rate peaks. The results also suggested that (1) bacterial growth increases positively with an increase in the carbon source concentration; (2) the appropriate pH is between 8.0 and 10.0; and (3) the optimal temperature and DDT concentration are 30°C and 10 mg l⁻¹, respectively.  相似文献   

Phytoremediation of pentachlorophenol-contaminated sediments by aquatic macrophytes     

Liangyuan Zhao  Chi Zhu  Chuangxin Gao  Jinhui Jiang  Jiaoyan Yang  Shao Yang 《Environmental Earth Sciences》2011,64(2):581-588

Capability of three species of aquatic macrophytes to remediate pentachlorophenol (PCP)-contaminated sediments starting with initial concentration of 2,000 μg kg⁻¹ dw (dry weight) was investigated. Negative effect of PCP on the plant growth, chlorophyll contents and root activities (p > 0.05) of the three species of aquatic macrophytes during remediation was not observed. PCP removal was significantly enhanced in the phytoremediated sediments in comparison with the control sediments after 90 days treatment (p < 0.05), and the removal rates of PCP in the sediments planted with P. communis Trin, T. orientalis and S. validus Vahl were 90.35 ± 0.03, 99.23 ± 0.02 and 99.33 ± 0.01%, respectively, while the rate was 29.87 ± 0.05% in the control sediments. Bioaccumulation by three macrophytes was confirmed; the maximum PCP contents in the roots of P. communis Trin, T. orientalis and S. validus Vahl were 419.50 ± 0.71, 1,833.33 ± 7.37 and 2,090.00 ± 2.65 μg kg⁻¹ at the 30th day, respectively. In conclusion, P. communis Trin, T. orientalis and S. validus Vahl may act as promising tools for the PCP phytoremediation in aquatic environment, especially S. validus Vahl.  相似文献   

一种船载水深测量数据均匀性分布研判方法     

范雕  李姗姗  赵东明  李新星  张金辉  孟书宇 《海洋测绘》2022,42(1):6-9

针对联合船载水深测量数据和海面重力信息构建海底地形模型时,判断测区水深测量数据分布均匀性主要依靠目视判别方法,致使效率较低缺点,借鉴图像处理领域特征点分布均匀性评价方法,结合船载水深数据抽稀简化技术,给出了描述船载水深测量测区数据均匀性分布量化指标方法.首先以4'网格边长为划分依据,将密集的船载水深测量数据抽稀简化;计...  相似文献   

基于C#语言的国(境)外地震背景信息交互式产出系统     

马秀丹  陈姝荞  龙海云  张晋辉 《地震地磁观测与研究》2021,42(1):162-168

针对国(境)外地震专报产出过程中遇到的信息搜索困难、内容不规范、难以满足时效性等问题,基于C#编程语言,设计开发了国(境)外地震专报背景信息交互式产出系统。该系统只需值班人员少许的参与,自动获取人口信息、海啸信息、震中附近一定范围内的历史地震目录,生成地震的人口伤亡信息,最终产出word格式的地震专报。  相似文献   

U–Pb and Re–Os Geochronology of the Tongcun Molybdenum Deposit and Zhilingtou Gold‐Silver Deposit in Zhejiang Province,Southeast China,and Its Geological Implications     

Qingdong Zeng  Yongbin Wang  Song Zhang  Jianming Liu  Kezhang Qin  Jinhui Yang  Weidong Sun  Wenjun Qu 《Resource Geology》2013,63(1):99-109

Mesozoic ore deposits in Zhejiang Province, Southeast China, are divided into the northwestern and southeastern Zhejiang metallogenic belts along the Jiangshan–Shaoxing Fault. The metal ore deposits found in these belts are epithermal Au–Ag deposits, hydrothermal‐vein Ag–Pb–Zn deposits, porphyry–skarn Mo (Fe) deposits, and vein‐type Mo deposits. There is a close spatial–temporal relationship between the Mesozoic ore deposits and Mesozoic volcanic–intrusive complexes. Zircon U–Pb dating of the ore‐related intrusive rocks and molybdenite Re–Os dating from two typical deposits (Tongcun Mo deposit and Zhilingtou Au–Ag deposit) in the two metallogenic belts show the early and late Yanshanian ages for mineralization. SIMS U–Pb data of zircons from the Tongcun Mo deposit and Zhilingtou Au–Ag deposit indicate that the host granitoids crystallized at 169.7 ± 9.7 Ma (2σ) and 113.6 ± 1 Ma (2σ), respectively. Re–Os analysis of six molybdenite samples from the Tongcun Mo deposit yields an isochron age of 163.9 ± 1.9 Ma (2σ). Re–Os analyses of five molybdenite samples from the porphyry Mo orebodies of the Zhilingtou Au‐Ag deposit yield an isochron age of 110.1 ± 1.8 Ma (2σ). Our results suggest that the metal mineralization in the Zhejiang Province, southeast China formed during at least two stages, i.e., Middle Jurassic and Early Cretaceous, coeval with the granitic magmatism.  相似文献