Origin of ore-forming fluids in Qinggouzi stibnite deposit,NE China:Constraints from fluid inclusions and H-O-S isotopes     

BAKHT Shahzad  SUN Fengyue  WANG Linlin  XU Chenghan  YE Lina  ZHU Xinran  FAN Xingzhu 《世界地质(英文版)》2021,24(2):80-88

The Qinggouzi stibnite deposit is located in Huashan Town, Jilin Province, in the northeastern margin of North China Craton(NCC). It is controlled by fault structures, hosted within structurally controlled felsic dykes, predominantly surrounded by phyllite, schist and quartzite. This study presents the results of fluid inclusions studies, intending to determine the source of the fluid responsible for ore-formation, hence exploring its metallogenesis. The aqueous biphase inclusions are identified in the stibnite-bearing quartz veins of the deposit. Moreover, aqueous biphase inclusions are further classified into(1) biphase liquid-rich inclusions(1 a) and(2) biphase gas-rich inclusions(1 b) depending upon liquid to gas ratio trapped within the fluid inclusions. Homogenization temperatures for(1 a) and(1 b) range between 114.8℃ to 422℃ and 128.3℃ to 267.5℃, respectively. 1 a and 1 b have salinities of 0.18% to 16.14% NaCl_(eqv) and 1.22% to 12.88% NaCl_(eqv), and density range from 0.43 to 1.02 g/cm~3 and 0.81 to 0.98 g/cm~3, respectively. Sulfur isotopic analysis indicates δ~(34)S_(V-CDT) from 4.4×10~(-3) to 6.5×10~(-3), with an average of 5.2×10~(-3), whereas H isotopes values on δD_(V-SMOW) standard are-100.8×10~(-3) and-107.5×10~(-3), while O isotopes data on δ~(18)O_(V-SMOW) standard range between 20.1×10~(-3) and 20.4×10~(-3). Fluid inclusions study, combining with sulfur and H-O isotopic data reveal that the ore-forming fluids originated from deep source and were subsequently contaminated by meteoric water. Hydrostatic pressure calculation shows that the minimum and maximum pressures are 11.65 and 42.33 MPa, and relevant depths of deposit are estimated to be 1.16 and 4.23 km. Finally, we inferred that Qinggouzi stibnite deposit is a medium-low temperature, low salinity hydrothermal deposit, which is formed by deep source and later contaminated by meteoric water, and is classified as epizonal deposit in terms of orogenic series.  相似文献   

地质钻探技术与应用研究   总被引：18，自引：0，他引：18  

冉恒谦  张金昌  谢文卫  张永勤  宋志彬  向军文  刘凡柏  冯起赠  鄢泰宁  贾美玲  陶士先  胡继良 《地质学报》2011,85(11):1806-1822

钻探技术是取得地下实物资料、验证地下信息推断与解释、最终圈定矿体、计算储量、评估品位唯一的技术手段,是实现取得宏观影响大成果的重要技术支撑.我国钻探技术和装备水平与国外先进国家相比有很大的差距,但近些年来有了长足的发展.通过国家重大科学工程项目“中国大陆科学钻探工程”5158m“科钻一井”的实施,取得了一系列钻探技术成...  相似文献   

云南六合富碱斑岩中花岗岩包体锆石U-Pb定年及其地质意义     

赵甫峰 《地质学报》2011,85(10):1574-1584

滇西地区沿金沙江-哀牢山断裂带广泛发育新生代富碱斑岩,其中六合富碱斑岩中发现了与镁铁-超镁铁质深源包体紧密共生的花岗岩包体.本文对花岗岩包体中锆石进行了阴极发光图像、LA-ICP-MS微量元素分析和U-Pb定年研究.研究表明,该花岗岩包体中锆石可分为岩浆锆石、老核新壳的复合岩浆锆石和变质交代成因锆石;复合岩浆锆石的新壳...  相似文献   

结构-地基体系水平与扭转位移耦合效应研究     

姜南  赵慧芳 《地震工程与工程振动》2011,31(5):142-148

采用动力理论对地基-结构非线性相互作用体系的振动方程进行了定性分析.基于多线性随动强化模型,采用非线性有限元法求解了基础和地基土之间的水平刚度与摇摆刚度,建立了结构-地基非线性相互作用体系的力学模型.利用拉格朗日能量法推导了结构水平位移和扭转相耦合的振动方程.采用多尺度法研究了结构-地基相互作用体系的主共振.通过分析不...  相似文献   

水轮机流道压力脉动诱发厂房振动分析   总被引：2，自引：0，他引：2  

郭涛  张立翔  姚激 《地震工程与工程振动》2011,31(6):136-140

水轮机压力脉动是引起厂房内源振动的主要诱因,如何在振动系统中合理、准确地施加水力荷载的振源特性,是目前机组振动分析的主要难点.文中将压力脉动假定为简谐荷载,通过跟踪楼板的振动变化和共振校核确定机组的振源特性,采用有限元法精细模拟了水轮机流道压力脉动诱发的厂房振动问题,并结合电站特点提出振动控制标准的建议值,由此对振动进...  相似文献   

L形和U形三维钝体结构绕流的数值模拟研究     

李庆祥  周云  汪大洋 《地震学刊》2011,(3):247-254

采用大涡模型对L形和U形三维钝体建筑物的绕流特性和风压分布特性进行数值研究。考虑平均和脉动速度入口边界,在雷诺数为1.5×10~5～7×10~5条件下,对2种钝体的9种分析工况进行瞬态动力分析,并将计算结果与已有研究进行对比。研究表明,钝体绕流对周围流场影响的强弱程度依次为尾流区、屋顶区、来流区,影响大小随着流场与钝体之间距离、钝体建筑高宽比、离地高度的增大而减小,且对来流区0.25H、屋顶上部0.4H、左右两侧0.5H、尾流区2.0H范围内流场的影响最大;钝体迎风面风压分布比较均匀,而侧面、背面和顶面受绕流涡旋的影响较大,平均风压分布较为复杂,并与脉动风压分布具有类似的变化趋势。研究结果对结构抗风设计与建筑风环境设计具有一定的参考价值。  相似文献   

大陆造山带岩石圈拆沉过程的数值模拟   总被引：1，自引：1，他引：0       下载免费PDF全文

王洪亮  白武明  王青平 《地球物理学报》2011,54(11):2851-2863

岩石圈拆沉作用是指部分岩石圈由于重力不稳定性而沉入软流圈中的过程,与造山带的演化密切相关.本文基于非牛顿流体近似的有效黏度模型对岩石圈拆沉的过程进行了数值模拟,着重分析了岩石圈的黏度结构对拆沉作用的影响.数值模拟显示,下地壳控制着地壳与岩石圈地幔的耦合程度,对拆沉作用的过程和形态有很大的影响;在一定的初始重力不稳定性条...  相似文献   

基于尺度变换随机共振的瞬变电磁弱信号检测   总被引：1，自引：0，他引：1       下载免费PDF全文

王国富  张海如  张法全  叶金才 《地球物理学报》2011,54(7):1928-1934

晚期瞬变电磁信号是大参数、多频率、且各频率分量未知的电磁信号,特别在晚期还是强噪声背景下的微弱信号.随机共振系统可以在极限信噪比的情况下提取微弱信号,但仅适用于小参数、单一频率或频率已知的高频信号的情况,为此,本文提出一种基于尺度变换的随机共振算法用于检测晚期瞬变电磁信号,该方法充分利用了随机共振检测弱信号的优势,通过...  相似文献   

Effects of turbulence on the transport of individual particles as bedload in a gravel‐bed river     

Geneviève Paiement‐Paradis  Geneviève Marquis  André Roy 《地球表面变化过程与地形》2011,36(1):107-116

This study investigates the association between mean and turbulent flow variables and the movement of individual particles in a gravel‐bed river. The experimental design implemented in the Eaton‐North River (Québec, Canada) is based on the simultaneous observations at a high temporal resolution of both particle movements as bedload using an underwater video camera and of the streamwise and vertical flow velocity components using a vertical array of three electromagnetic current meters (ECMs). The frequency and distance of displacement of particles larger than 20 mm that were sliding or rolling on the bed were measured from a 10 minutes long film. Mean and turbulent flow properties obtained for periods without sediment transport are compared to those when particles were sliding and rolling. When particles are sliding, weak differences are present for the mean streamwise velocity and normal vertical stresses. Instantaneous Reynolds shear stresses are significantly lower for sliding events which was not expected but could be explained by the important dominance of Quadrant 3 events (inward interactions). When particles are rolling, only the vertical normal stresses show a weak difference from those observed in the absence of transport but they tend to occur when Quadrant 2 (ejections) dominate the flow field. For both sliding and rolling particles, vertical and/or streamwise fluid accelerations show high magnitude values when compared to periods without transport. For sliding particles, streamwise acceleration is mostly negative and combines most of the time with a positive vertical acceleration. For rolling particles, streamwise and vertical acceleration are predominantly of opposite sign. These results suggest that fluid acceleration or deceleration in the streamwise and vertical directions is affecting the pressure field around particles. In this study, fluid acceleration seems to play a more important role than Reynolds shear stress or normal stresses for bedload movements. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

阿吾拉勒山琼布拉克铜矿床流体包裹体及碳氧同位素研究   总被引：1，自引：1，他引：0  

罗勇  廖思平  杨武斌  单强  周昌平 《矿床地质》2011,30(3):547-556

琼布拉克铜矿床位于新疆伊宁县境内,前人对该矿床的成因一直存在争议.文章通过对琼布拉克铜矿床方解石中的流体包裹体进行系统的岩相学、显微测温学和碳氧稳定同位素分析研究,探讨了成矿流体的来源及演化.研究表明:琼布拉克铜矿床的流体包裹体主要为气-液两相包裹体,另有少量的气相包裹体,未见富CO2和含子矿物的流体包裹体,显示出张性...  相似文献