Geology and mineralization of the Tiegelongnan supergiant porphyry-epithermal Cu (Au,Ag) deposit (10 Mt) in western Tibet,China: A review     

Huan-huan Yang  Qin Wang  Yan-bo Li  Bin Lin  Yang Song  Yi-yun Wang  Wen He  Hong-wei Li  She Li  Jian-li Li  Chang-cheng Liu  Shi-bin Feng  Tang Xin  Xue-lian Fu  Xin-juan Liang  Qi Zhang  Bei-qi Wang  Yang Li 《China Geology》2022,5(1):136-159

The Tiegelongnan Cu(Au,Ag)deposit in central Tibet contains more than 10 Mt of copper ranking 29 th in the world.It is characterized by typical porphyry-epithermal alteration and mineralization.In order to improve the understanding of porphyry-epithermal copper deposit in Tibet,new zircon U-Pb age and sulfur isotope data along with published data in the Tiegelongnan are presented to investigate the formation and preservation mechanism.Ore-related intrusive rocks in the Tiegelongnan including Early Cretaceous(about 120 Ma)granodiorite porphyry and diorite porphyry are closely related to the northward subduction of Bangongco-Nujiang ocean.Sulfur mainly comes from deep magma,and ore-forming fluid is affected by both magmatic and meteoric water.The metallogenic setting of Tiegelongnan is consistent with those of Andean porphyry copper deposits in South America.The cover of the Meiriqiecuo Formation volcanic rocks,Lhasa-Qiangtang collision and India-Eurasian collision have significance in the preservation and uplift of the deposit.The formation,preservation and discovery of Tiegelongnan play an important role in exploration of ancient porphyry-epithermal deposits in Tibet.  相似文献   

赞比亚成矿区带的划分及主要成矿带地质特征          下载免费PDF全文

修群业  韩军  王杰  刘晓阳 《地质找矿论丛》2015,30(S1):13-17

文章依据地质构造单元、主要矿种和主要成矿类型,将赞比亚划分为古元古代班韦乌卢金-铁-锰多金属成矿带、中元古代基巴拉锡-钽-钨成矿带、中元古代伊鲁米德金-铜-铁成矿带、新元古代中非铜-钴成矿带、新元古代谦比西金-铜-钴成矿带、古生代-新生代卡鲁金刚石成矿带以及卡拉哈里沙漠等7个Ⅲ级成矿区带,并阐述了其中赞比亚主要的中元古代伊鲁米德金-铜-铁成矿带和新元古代中非铜钴成矿带的地质特征。  相似文献   

郑州市郑东新区浅层地下水资源现状调查及开采潜力分析     

王帅  王武涛  吕小凡 《地下水》2015,(3)

为合理开发地下水资源,减少开采地下水给环境带来的消极影响,开展有效保护地质和生态环境,实现地下水资源可持续开发利用,郑州市郑东新区开展地下水资源调查评价。通过水文地质测绘、物探、钻探、试验等手段,初步查明调查区内含水层空间分布、岩性、厚度、含水层富水性等。结论认为:浅层水受黄河侧渗补给明显,资源储量大,调蓄能力强,是区内地下水的主要开采层段,在沿黄地区可规划建设大型水源地,具有较大的开发利用价值。确定郑东新区后备水源地位于中牟县东漳——狼城岗一带的黄河滩地区。  相似文献   

独居石矿物地球化学对南秦岭宁陕地区Be- Nb伟晶岩成因的指示     

聂潇  陈雷  于涛  郭现轻  王宗起 《地质学报》2023,97(11):3737-3749

近年来,在秦岭造山带宁陕伟晶岩区发现了数条Be-Nb稀有金属伟晶岩矿脉。本文通过扫描电镜和电子探针分析了Be-Nb伟晶岩中独居石的矿物学特征和矿物成分。研究结果表明,伟晶岩脉中的独居石可分为两类:Ⅰ类独居石主要分布在石英、长石等造岩矿物内部,在背散射图像中多数Ⅰ类独居石内部均匀,部分可见振荡环带,具有较高的Th O₂含量(7.0%～13.9%,平均10.5%);Ⅱ类独居石单矿物在背散射图像下同样显示内部均匀,但亮度明显低于Ⅰ类独居石,且Th O₂含量较低(0.9%～4.4%,平均2.2%)。这指示了Ⅰ类独居石的岩浆成因和Ⅱ类独居石的热液成因。岩浆成因独居石具有较高的Th O₂含量与独居石中磷钙钍石的类质同象替代密切相关。岩浆成因独居石的U-Pb测年结果为200.8±2.1 Ma,代表伟晶岩的成岩年龄,该年龄结果接近宁陕岩基中的二长花岗岩。岩浆和热液成因独居石的εNd值的范围为4.6～3.0,这与二长花岗岩的εNd值范围基本一致,说明区内Be-Nb伟晶岩与上述二长花岗岩的同源性。综上所述,本研究认为宁陕地区Be-Nb伟晶岩...  相似文献   

ASTER数据与ETM数据蚀变信息提取的对比研究——以巴什布拉克铀矿区油气还原蚀变分析为例   总被引：4，自引：0，他引：4  

叶发旺 《地球信息科学学报》2009,11(3):274-281

本文在深入分析巴什布拉克铀矿区油气还原蚀变岩石的光谱特征,ASTER与ETM数据对蚀变岩石光谱特征反映的差异性的基础上,提出了正反两种蚀变信息提取的思路和两种数据在不同思路下提取蚀变信息的效果对比。研究表明,利用ASTER数据与ETM数据在增强研究区三价铁信息,间接反映油气还原蚀变规律方面效果相当;而在直接增强油气还原蚀变信息方面,ASTER数据的应用效果明显好于ETM数据。增强的遥感油气还原蚀变信息对分析研究区白垩系油气还原蚀变规律和矿区外围铀矿找矿具有重要的意义。  相似文献   

Comparative study on Chinese urban agglomeration districts     

Li Chenggu  Huang Yanjun  Wang Qichun 《中国地理科学(英文版)》1997,8(2):136-143

The formation and development of urban agglomeration districts are the inevitable trend of modern urban evolution. Owing to the differences of formation background, urbanized way and process of different cities in the world, the feature and formation mechanism of urban agglomeration districts in the world present obvious spatial differences. The paper inquires into the structure feature, formation mechanism and development trend of different kinds of Chinese urban agglomeration districts by studying four big urban agglomeration districts: Jing-Jin-Tang (Beijing-Tianjin-Tangshan), the middle and south of Liaoning, Hu-Ning-Hang (Shanghai-Nanjing-Hangzhou), and Zhujiang River delta. The paper wants to promote the formation and development of theory and practice system of Chinese urban agglomeration districts.  相似文献   

THE VERTICAL DEFORMATION BEFORE AND AFTER THE TANGSHAN EARTHQUAKE OF 1976          下载免费PDF全文

Xie Jue-min  Huang Li-ren 《地震地质》1987,9(3):11

Based on the data of 18 times of leveling carried out during 1954 to 1985, the relative stability degrees of relevelling nodes in the Tangshan area are calculated. According to these results, the characteristics of crustal vertical deformation before and after the Tangshan Earthquake(28/7/1976,Ms =7.8) are studied. Our study indicates that probably since 1968 significant relative movements between structural blocks in that area had appeared and continued till 1978. The seismic fault wa  相似文献   

The Santonian-Campanian reversed polarity magnetozone and the Late Cretaceous magnetostratigraphical time-scale     

D.M. Pechersky  D.P. Naidin  E.A. Molostovsky 《Cretaceous Research》1983,4(3):251-257

Magnetostratigraphical data on the Late Cretaceous Magnetic Quiet Zone (normal geomagnetic polarity zone Jalal) are reviewed. This zone was first defined by Shmeleva (1963) in deposits of the Fergana Ridge (U.S.S.R.), and was there found to contain a reversed (R) magnetozone, named the Kuldja, which was traced to various regions of the U.S.S.R. The Kuldja zone corresponds to magnetozone Gubbio A — defined at Gubbio (Italy). Palaeontological data suggest that it spans the boundary between the Santonian and Campanian stages.  相似文献   

高精度静态人口空间分布研究——以银川市西夏区为例     

余思汗  雷启云  王银  刘超  杨顺  王静 《震灾防御技术》2020,15(4):757-766

地震发生后，人口空间分布密度是决定救援力量部署的重要依据。然而，高精度人口空间分布数据存在获取和更新困难的问题，缺少有效的解决途径。以银川市西夏区为例，基于高空间分辨率遥感影像，通过建筑物解译与实地调查相结合的方式获取住宅建筑物信息，建立人口与住宅建筑物之间的关系模型，得到更客观真实的人口空间分布情况。研究结果表明，以高空间分辨率遥感影像解译住宅建筑物作为人口空间分布指示因子建模，得到的总体预测人口误差率为3.56%，人口平均相对误差率为9.19%，研究结果具有较高的可靠性，为震前灾害风险评估和震后灾情快速评估提供可靠的人口空间分布数据。  相似文献   

石家庄高新技术产业开发园区地域价值结构与变涵基准地价研究     

马仁会  李树国  李小波 《地理与地理信息科学》2002,18(1):90-92,106

该文通过高新区地域价值结构的研究 ,阐述了不同用地类型地价比率和不同级别地价变化梯度 ,旨在建立动态基准地价体系 ,为今后及时把握地产市场价值的变化提供依据。同时提出了变涵基准地价的概念及其在应用上的可行性。  相似文献