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《吉林地质》2016,(4)
珲春东部是中国东北地区重要的金铜矿化集中区,发育有小西南岔、农坪及大东南岔等多个金铜矿床。本文在区域地质背景和矿床地质特征研究的基础上,结合区域矿床对比,探讨了大东南岔金铜矿的矿床成因。大东南岔金铜矿床的金铜矿(化)体受北西向、北东向和近南北向断裂破碎带以及东南岔背斜构造控制,呈陡倾斜的含金铜石英脉、金属硫化物细脉及网脉产于海西晚期五道沟群地层、海西晚期石英闪长岩和英云闪长岩以及燕山晚期流纹斑岩和闪长玢岩等脉岩,及它们的接触带附近。以上矿床地质特征及其成矿地质条件,均与区内著名的小西南岔大型斑岩型金铜矿床极其相似,表明大东南岔金铜矿可能为斑岩型金铜矿床,受控于燕山晚期古太平洋板块向东亚大陆的斜向俯冲作用。 相似文献
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小西南岔金铜矿带的构造特征及其控矿作用 总被引：1，自引：0，他引：1
小西南岔金铜矿带位于吉林省东端,呈南北向带状展布。经一比五万区域地质调查,初步确定本区有东西向构造带、南北向构造带、新华夏构造系及北西(北北西)向构造系(图1)。一、小西南岔地区构造基本特征由于本区构造长期发育,多期活动,导致各方向,各种类型的构造形迹之间相互切割、利用、改造、进而使本区的主要成矿元素金、铜等多期活化、转移、富集,造成了成矿作用的多期性、复杂性。各构造体系的基本特征如下: 相似文献
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本文通过对吉林东部延边五凤—小西南岔地区中生代火山岩型金、多金属矿床地球物理分析、地球化学分析和成矿地质条件分析,总结了该类型矿床的区域分布规律及矿化蚀变类型,提出了寻找金及多金属矿床的远景地带。 相似文献
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Ivan V. BRAGIN Georgy A. CHELNOKOV Oleg V. CHUDAEV Natalia A. KHARITONOVA Sergey V. VYSOTSKIY 《《地质学报》英文版》2016,90(1):276-284
Studied waters belong to warm(T=30-50℃),alkaline(pH=8.9-9.3),low mineralized(TDS235 mg/1)Na-HCO_3 or Na-SO_4-HCO_3 thermal waters with high content of SiO_2(up to 81 mg/l)and F(up to 3.9 mg/1),occur on modern volcano-tectonic rejuvenated areas of Eastern Sikhote-Alin orogenic belt.Low~3He concentration as well as N_2/O_2 and N_2/Ar ratios exclude influence of deep mantle fluid.New rare earth element data constrain our understandmg of water-rock interaction occurring in the water source region.Meteoric origin of waters is proved by stable isotope values varying from-71‰to-136.1‰and from-10.8‰to-18.8‰forδ~2U andδ~(18)O respectively.REE patterns reflect high pH,resultfing from water-rock interaction and oxidative conditions.Calculations of deep aquifer temperature using Na-K and quartz geothermometers show 116.8-131.1°C and 82.2-125.8℃respectively.Presence of deep faults both with abnormal thermal gradient(~45-50 K/km)define unique geochemical shape of thermal waters of Sikhote-Alin,area,where no present volcanic activity is registered. 相似文献
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土压缩模量预测回归分析方法 总被引：1，自引：0，他引：1
在土压缩模量Es的分析计算中,常用的分析方法是根据土的e-p曲线试验资料建立公式求解,本文引入了数学上的回归分析方法来探讨Es与其它各项物理力学指标参数之间的相关关系,旨在找出对Es影响最显著的指标参数,并建立最优回归方程式,以此来预测Es。研究结果表明:该方法通用性强,应用范围广,亦可推广应用于其它相关领域。 相似文献
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Using the database of automatic hydrometeorological stations, installed in the Don RIver delta and Taganrog Bay seashore, the sources of the anomalois scale water negative surge and salinization of the Azov Sea under conditions of low river flow in 2015–2016 are studied. The new schemes of stratification and advection of salty sea waters in the Don River mouth under different weather conditions, water discharge and levels are given. 相似文献
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Doklady Earth Sciences - Multiannual observations (2009–2017) by means of autonomous seiche recorders have been conducted for marine seiches with one second discreteness in the boot basin for... 相似文献
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《International Geology Review》2012,54(10):1218-1225
Copper deposits of Cuba belong to the Jurassic lead-zinc-copper, Cretaceous copper and Paleogene copper complexes, which differ substantially in their formation conditions. The island is differentiated into a number of metallogenic zones formed at the initial and early stages of the Cuba folded province. Pinar del Rio, Pinos, Trinidad and Oriente zones, of an intrageanticlinal nature, are prospective with respect to copper vein deposits of the lead-Zinc-copper complex. The Sasa and Cauto zones - intrageosynclinal - are prospective with regard to copper-pyrite and copper vein deposits of the Cretaceous complex. A metallogenic study of the island is indicated in planning the exploration of its copper prospects. -- AGI Staff. 相似文献