The Kiloton Class Jiaojia Gold Deposit in Eastern Shandong Province and Its Genesis

The recent deep prospecting results in the Jiaojia area of Eastern Shandong Province indicate that the Jiaojia ore field composed of several individual gold deposits as previously suggested is actually an ultra-large gold deposit. This deposit covers an area of ~40 km2, and shows a structural control by the Jiaojia fault and its secondary faults. Gold orebodies generally occur along the same mineralization-alteration belt, and the main orebodies intersect with each other or exhibit a parallel or overlapping distribution. This deposit's reserves are estimated to be 1, 200t of gold, being the first gold deposit of more than 1000t gold reserves in China. The No. I-1 orebody in the Shaling-deep Sizhuang ore blocks holds gold reserves greater than 350 t, or 29 percent of the total reserves, followed by the No. I orebody in Matang-Jiaojia ore blocks with exceeding 150t gold reserves. This deposit mainly occurs in the footwall of the Jiaojia fault, and presents zoned patterns in mineralization, alteration and structures. The strongly mineralized zones agree with strongly altered and tectonically fractured zones. These orebodies display strataform-like, veinlike or lenticular shapes, and generally show characteristics of pinching out and reappearing, branching and converging, expanding and shrinking. The orebodies commonly occur along positions where the fault strike changes and in gentle locations with dips changing from steep to gentle. The main orebodies are parallel to the main plane of the orecontrolling fault, and tend to be gentle from the surface to the deep. The orebodies mainly plunge to the southwest, with plunge angle of 45°–60°. Orebodies near the main plane of the ore-controlling fault have more gold resource than those away from main fault zone. The slant depth of orebodies is generally larger than the length along its strike direction; orebodies become thick and gold grades become low from the shallow area to the deep area. Ore-forming fluids are H2O-CO2-NaCl±CH4 type with medium-temperature and moderate to low salinity. Sulfur isotopic values(δ34SCDT) for gold ores range between 11.08‰ and 12.58‰, indicating mixed sulfur sources; hydrogen isotopic values(δDVSMOW) range from-83.68‰ to-116.95‰ and oxygen isotopic values(δ18OV-SMOW) range between 12.04‰ and 16.28‰. The hydrogen and oxygen isotopes suggest that ore-forming fluids originated from primary magma, and mixing with a large amount of atmospheric water during the late stage. The Eastern Shandong Province gold deposits are associated with magmatic activities which have mantlecrust-mixed source, and also share some similarities with orgenic and epithermal hydrothermal gold deposits. Because Eastern Shandong Province gold deposits with unique metallogenic features and formation setting which are different from other gold deposit types in the world, we call it the Jiaojiatype gold deposits. The kiloton class Jiaojia gold deposit is related to fluid activities, extension and detachment resulted from thermal upwelling of magmas. The strong magmatic activities in the middle to late stage of early Cretaceous in Eastern Shandong Province lead to active fluids, and provided abundant ore-forming materials for gold depsoits. Moreover, many extensional structures resulting from crustal extension provided favourable space for orebody positioning.     

近年世界黄金勘查开发的进展与动向

文章分析研究了近年世界黄金勘查开发投资的变化趋势,在固体矿产勘查投资中所占比例的变化,发现的重要金矿床,以及世界主要国家和地区黄金投资预算情况.     

琼东南盆地现今地层温度分布特征及油气地质意义

温度状态是决定油气形成与保存的关键因素，精准的深部地层温度预测对盆地油气资源战略评价和勘探开发具有重要意义。琼东南盆地是我国当前深水油气资源勘探的重点区块，揭示盆地深部地层温度分布格局及主控因素是深水油气勘探研究的一项基础工作。结合钻孔实测温度和系统的岩石热物性参数，文章揭示了琼东南盆地现今深部地层温度分布特征。研究表明，琼东南盆地的优势储层温度为90~150℃ （数据占比>70%），高于国外学者提出的储层“黄金温度带”（60~120℃），推测与南海北部大陆边缘盆地高地热背景有关。此外，盆地T30—T70 界面处的估算温度均表现为“西高东低”的特征，高温区域位于西部的崖南凹陷；深部温度分布格局与地层的埋深、热导率结构以及因区域拉张程度不同引起的基底热流差异等诸因素有关。成果为琼东南深水油气勘探开发及钻井工艺设计提供了坚实的地热学依据。     

黄金散合卷心菜外敷治疗乳汁淤积症43例疗效观察

目的：观察黄金散合卷心菜外敷治疗乳汁淤积症的临床疗效。方法：将86例乳汁淤积症初期的产妇随机分为治疗组和对照组,每组各43例。对照组采用推拿手法按摩乳房治疗,治疗组在对照组治疗基础上加如意黄金散合卷心菜外敷乳房治疗。结果：总有效率治疗组为97.67%,对照组为79.07%,2组比较,差异有统计学意义（P<0.05）。结论：黄金散合卷心菜外敷乳房治疗乳汁淤积症有较好疗效。     

武警黄金部队吹响西进北上找矿冲锋号

4月17日,武警黄金部队千余官兵开赴新疆、西藏、青海、大兴安岭,执行区域地质矿产调查任务。在当天举行的誓师大会暨出征仪式上,国土资源部部长徐绍史指出,此举吹响了武警黄金部队西进北上为国找矿的冲锋号,迈出了部队调整转型具有历史意义的第一步,期盼部队胜利凯旋。     

编读

<正>上期封面三音石省直管县财政体制改革使省对市、市对县的两层博弈改成为省直接一对多的博弈,将改变两级财力积累进程和利益均衡结构,进而影响省、市、县财政的理性行为,必须统筹协调、创新保障机制、完善配套措施,才能形成地方政府自上而下的合力,放大省直管县财政体制改革"正效应",实现省直管县财政体制改革"软着陆"。     

“史上最长黄金周”低碳出游指南

陷入生态保护困局的热门景区,需要你我一起去拯救     

A study on the genetic relations between Permian Longtan Formation coal series strata and Carlin-type gold deposits,southwestern Guizhou Province,China

A large number of the Carlin-type gold deposits occur in the Longtan Formation in southwestern Guizhou Province. The Longtan Formation contains abundant basalt, tuff and siliceous rocks. All rocks of the Long-tan Formation are enriched in gold, which were deposited in a limited platform environment in the transition zone from marine to continental. The process of sedimentation was accompanied by the eruption of Emeishan basalt and hydrothermal deposition controlled by co-sedimentary submarine deep faults in the west, which led to the formation of a peculiar gold-bearing formation with coal series strata. This formation controlled the occurrence of the Carlin-type gold deposits in southwestern Guizhou Province. In response to the remobilization of the Emei mantle plume during the Yanshanian period, As, Au and other ore-forming materials were continuously extracted by deeply circulating waters from the Emeishan basalt and coal seams, thereafter forming ore-forming hydrothermal solutions. When these elements were transported in the coal seams, large amounts of As, Au and other elements were enriched in pyrite within the coal seams, thus forming high-As coal and Carlin-type gold deposits in the Longtan Formation coal series strata.     

珠宝企业对黄金价格变动的灵敏性分析

如今金、工分离的黄金饰品销售方式使得黄金饰品的价格越来越透明。珠宝企业对黄金价格变动的灵敏度的高低不仅关系到消费者的权益,更关系到珠宝企业的利润。通过数学建模和运用MATLAB软件,分析了珠宝企业对黄金价格变动的灵敏程度。结果显示,灵敏性从高到低依次为：全国性知名珠宝企业（包括港资）、一般区域性珠宝企业和当地私营珠宝企业;灵敏性的差异源于不同珠宝企业受黄金市场、地方政策及经营模式影响程度的不同。研究发现,所调查的珠宝企业对金价均是追涨止跌,以获得最大利润。     

宋、辽、金时期地图应用与发展

宋代出现火药、指南针、活字印刷三大发明,理论科学别开生面,中国自然科学史把宋代称之为自然科学发展的黄金时代。宋代的地图学与其它自然科学一样,也是一个突飞猛进的发展时宋代的期。其特点是图记、图志的格式逐渐向纯文字记叙的"方志"发展;全国一统地图版本繁多;保留至今的石刻地图工艺精湛;重视边防地图制作;木质地形模型图出现。中国古代著名科学家沈括不仅著有被后人称诵的《梦溪笔谈》,在地图绘制上也有创新,其绘制的《守令图》不仅吸取了裴秀的制图六体理论,在制图理论和方法上又有创新。