Stable isotope characteristics and origin of ore-forming fluids in copper-gold-polymetallic deposits within strike-slip pull-apart basin of Weishan-Yongping continental collision orogenic belt, Yunnan Province, China     

Wang Yong  Hou Zengqian  Mo Xuanxue  Dong Fangliu  Bi Xianmei  Zeng Pusheng 《Frontiers of Earth Science》2007,1(3):322-332

More than 140 middle-small sized deposits or minerals are present in the Weishan-Yongping ore concentration area which is located in the southern part of a typical Lanping strike-slip and pull-apart basin. It has plenty of mineral resources derived from the collision between the Indian and Asian plates. The ore-forming fluid system in the Weishan-Yongping ore concentration area can be divided into two subsystems, namely, the Zijinshan subsystem and Gonglang arc subsystem. The ore-forming fluids of Cu, Co deposits in the Gonglang arc fluid subsystem have δD values between −83.8‰ and −69‰, δ¹⁸O values between 4.17‰ and 10.45‰, and δ¹³C values between −13.6‰ and 3.7‰, suggesting that the ore-forming fluids of Cu, Co deposits were derived mainly from magmatic water and partly from formation water. The ore-forming fluids of Au, Pb, Zn, Fe deposits in the Zijinshan subsystem have δD values between −117.4‰ and −76‰, δ¹⁸O values between 5.32‰ and 9.56‰, and Δ¹³C values between −10.07‰ and −1.5‰. The ore-forming fluids of Sb deposits have δD values between −95‰ and −78‰, δ¹⁸O values between 4.5‰ and 32.3‰, and Δ¹³C values between −26.4‰ and −1.9‰. Hence, the ore-forming fluids of the Zijinshan subsystem must have been derived mainly from formation water and partly from magmatic water. Affected by the collision between the Indian and Asian plates, ore-forming fluids in Weishan-Yongping basin migrated considerably from southwest to northeast. At first, the Gonglang arc subsystem with high temperature and high salinity was formed. With the development of the ore-forming fluids, the Zijinshan subsystem with lower temperature and lower salinity was subsequently formed. Translated from Mineral Deposits, 2006, 25(1): 60–70 [译自: 矿床地质]  相似文献   

基于AHP的新疆土地利用综合承载力研究   总被引：5，自引：0，他引：5  

马爱慧  李默  李晓东 《云南地理环境研究》2007,19(3):114-118

论文构建了一套适合区域土地承载力综合评价指标体系，并运用层次分析法确定各个指标的权重，求出每个地区的土地利用承载力综合得分并将该区土地承载力划分为4种类型区，即：低承载力区（和田地区、喀什地区、克孜勒苏柯尔克孜自治州）、中等承载力区（博州、伊犁州直属、阿克苏地区、哈密地区、吐鲁番地区、阿勒泰地区）、较高承载力区（昌吉州、巴州、塔城地区）、高承载力（乌鲁木齐、克拉玛依）。宏观上把握每个地区的土地利用综合承载力，为当地土地利用政策制定，提供一定的指导意义。  相似文献   

圆梁山隧道毛坝向斜段典型岩溶现象及发育分布特征   总被引：11，自引：0，他引：11  

屈科  许模  徐则民  王科  蒋良文 《地质灾害与环境保护》2001,12(1):43-47

圆梁山隧道毛坝向斜段核部及两翼的可溶地层中发衣分布有大量的典型岩溶现象，本文详尽讨论了岩溶洼地，槽谷，巨型组合槽谷和地下溶洞等大型岩溶形态的基本特征，形成机制，受控因素，并进一步认识到其发育分布主要受控于岩性和构造因素。  相似文献   

An experimental study of the effect of iron on magnesiochloritoid-talc-clinochlore-kyanite stability     

Monika Koch-Müller  Richard Wirth 《Contributions to Mineralogy and Petrology》2001,141(5):546-559

The influence of Fe on the reaction clinochlore+kyanite&ding3F;magnesiochloritoid+talc (1) was determined experimentally as a function of pressure (1.6-2.6 GPa) and composition at 600 and 540 °C. Analytical electron microscopy (AEM) was used to determine the compositions of the coexisting phases in these complex multiphase run products. Within the compositional range studied (x_Fe^bulk=0.12-0.34), chlorite solid solutions were always richer in magnesium than the coexisting chloritoid solid solutions. Fractionation of Fe into the chloritoid extends the stability field of the assemblage chloritoid plus talc towards lower pressures. However, the extent of the stability field for increasing x_Fe is less than one would expect for ideal mixing behaviour in chloritoid and chlorite, and indicates a moderate positive deviation from ideality for chloritoid solid solutions. The thermodynamic data for magnesiochloritoid given in two earlier studies are in good agreement with the present experiments, those of a third study yield pressures which are much too high, at least compared with the experiments at 600 °C.  相似文献   

逸出气体的监测及其与地震活动的关系     

莫栋波 《华南地震》1993,13(3):45-49,29

地下流体能较好地反映地壳应力的变化,对地震前兆的监测预报有一定的意义。本文通过对地下热矿水中逸出气的组分、总量及其与溶解气量比的观测和试验,表明地下水中的逸出气体有良好的震兆作用,其中逸气总量以及逸出氦等组分可望成为映震的灵敏测项,有必要深入开展观测研究。本文还介绍了自行设计的集气装置及效果较好的现场简易测量方法。  相似文献   

地-气耦合动力系统的研究     

莫嘉琪  王辉  林万涛 《气象学报》2006,64(3):400-404

研究了一类地-气耦合系统的非线性模型,目的是创建一个地-气振子模型的非线性方程的渐近求解方法,利用变分迭代方法,构造了对应问题解的近似展开式。即首先引入一组泛函和计算出它们的变分,并算出Lagrange乘子,其次,决定变分迭代,最后得到原地-气振子模型非线性问题解的一致收敛的近似展开式。  相似文献   

基于同名点对的小面元影像微分纠正及融合方法     

莫华秦志远  黄华文 《测绘科学与工程》2006,26(3):27-32

多源遥感影像数据融合是提高海量遥感影像数据利用率，获取更多决策辅助信息的有效手段之一。目前一些商业遥感图像处理软件在进行多源遥感影像融合时，存在效率低、精度难以达到实用要求等问题。本文提卅了基于图像线特征的遥感影像精确配准、纠正、融合新方法，该方法运用线特征算法提取图像边缘特征点作为控制点，然后通过全自动图像匹配获取密集同名点对，由这些同名点对构成密集三角网（小面元）实现影像精确配准；最后进行影像纠正融合处理。大量实践表明，该方法是一种高效实用、高精度的遥感影像配准、纠正、融合方法，能大大改善山区等特殊地区的配准精度。  相似文献   

Inversion of coseismic stress-triggered fault slips using borehole strainmeter observations     

邱泽华  阚宝祥唐磊  张超凡宋茉 《地震学报(英文版)》2006,19(6):643-649

Coseismic stress-triggering is becoming a new hot spot of research. Coseismic strain steps recorded by borehole strainmeters are particularly valuable in studying coseismic stress-triggered fault slips. Based on the theory of dis location, one can invert the triggered fault slips with such data if he/she has a well understanding about the local faults. Genetic algorithm can be applied to significantly raise the efficiency of searching a best solution among all possibilities in this kind of inversion. A testifying check of the program and analyses of each parameter＇s influence may further enhance the reliability of inversion results. Taking complexity of geological structure into account, the inversion results should be regarded as the predominant property or a comprehensive effect of triggered local faults＇ activities. As an attempt, we inverted the assumingly active faults＇ slips triggered by the Ms=8.1 Kunlun Mountain earthquake over Beijing area.  相似文献   

GPS应用于垂直位移监测的方案设计及数据处理方法     

莫乃鹤  李向新 《国土资源信息化》2007,(2):28-30

本文主要研究了GPS变形监测中垂直位移的问题。通过对误差分析,建立GPS大地高高差平差模型,以便提高GPS变形监测在垂直位移方向上的精度。从而真正的达到GPS三维监测。  相似文献   

张家口水泉沟碱性杂岩体单颗粒锆石^207Pb／^206Pb年龄分析   总被引：10，自引：1，他引：9  

梁华英  莫测辉 《地球化学》1998,27(1):59-65

用单颗粒锆石铅蒸发－沉积法分析张家口地区赋金水泉沟碱性杂岩体形成时代,保持封闭体系３颗锆石的＾２０７Ｐｂ／＾２０６Ｐｂ值表面年龄在１６０７－１６６７Ｍａ之间,与锆石Ｕ－Ｐｂ法上交点年龄（１７１８±６５）Ｍａ基本一致,水泉沟碱性杂岩体是１６－１７亿前形成的。  相似文献