江西德兴铜金矿集区成矿规律

德兴矿集区铜金成矿受地层、岩性、岩浆活动、构造等多种因素的控制,通过对控矿作用的研究,指出了矿集区铜金成矿的基本规律.     

河南省桐柏县银洞坡金矿床(西段) 地球化学找矿标志及预测评价

通过对河南银洞坡金矿床地球化学特征的研究, 建立了地球化学找矿标志。元素组合复杂, 由Au、Ag、Pb、Zn、As、Cd形成了强异常;主要异常元素浓集中心明显, 分带清晰;w(As)/w(Mo)≥4;w(As)+w(Cd)+w(Au)/w(Ni)+w(Co)+w(Mo)≥10;浓集克拉克值≥0.5, 变异系数≥1;异常呈条带状有规律分布并受含矿层及构造控制。根据这些标志, 在银洞坡矿区外围W4～W24线等地进行了成矿预测, 预测结果新增加金金属量11.945 t。     

腐植酸相分析测试方法

本文介绍了从土壤样品中快速提取腐植酸的方法及测定腐植酸中碳及其相中铀、金等主要相关元素的相分析方法，应用相分析技术寻找隐伏铀矿床取得了较好的地质效果。     

Excel回归分析及其在矿井瓦斯涌出量预测中的应用

回归分析方法是处理变量之间相关关系的有利工具,在很多领域都有应用。介绍了多元线性回归分析的数学原理,以及用MicrosoftExcel工作表进行多元回归分析的多种方法。在应用实例中用常村矿井的钻孔实测数据,演示了Excel多元线性回归各种方法的分析过程。     

Outokumpu revisited: New mineral deposit model for the mantle peridotite-associated Cu–Co–Zn–Ni–Ag–Au sulphide deposits

The metaturbidites of the Palaeoproterozoic Jormua–Outokumpu thrust belt in eastern Finland enclose m- to km-scale ultramafic massifs that are distributed over an area of more than 5000 km². These bodies, which almost entirely consist of highly depleted mantle peridotites (now metaserpentinites and metaperidotites), are intimately associated with massive to semimassive, polymetallic Cu–Co–Zn–Ni–Ag–Au sulphide deposits that sustained mining in the region between 1913 and 1988. Currently, one deposit (Kylylahti) is proceeding into a definitive feasibility study emphasising the renewed economic interest for Outokumpu-type deposits.The origin of these Outokumpu-type Cu–Co–Zn–Ni–Ag–Au deposits is now re-interpreted to be polygenetic. First, their formation requires deposition of a Cu-rich proto-ore within peridotitic sea floor at  1950 Ma. Close modern analogues to the proto-ore setting include, for example, the Logatchev and Rainbow fields at the Mid-Atlantic Ridge, where venting of high-T–low-pH hydrothermal fluid resulted in accumulations of Cu–Zn–Co–Ag–Au sulphides on serpentinised ultramafic seafloor. Second, the Ni-rich composition of Outokumpu sulphide ores calls for a separate source for nickel: Some 40 Ma after the deposition of the Cu-rich proto-ore – concomitant with the obduction of the ultramafic massifs – disseminated Ni sulphides formed through chemical interaction between obducting peridotite massifs and adjacent black schists. This process was related to listwaenite–birbirite type carbonate–silica alteration at margins of the ultramafic massifs. Due to this alteration, silicate nickel was released from the primary Fe–Mg silicates and redeposited as Ni sulphides in the alteration fringes of the massifs.We propose that syntectonic mixing of these two “end-member” sulphides, i.e., the primary Cu-rich proto-ore and the secondary Ni-sulphide disseminations, resulted in the uncommon metal combination of the Outokumpu-type sulphides. Late tectonic solid-state re-mobilisation, related to the duplexing of the ore by isoclinal folding, upgraded the sulphides into economic deposits.     

钱家营矿12-1煤层赋存特征

研究煤 层 结构 、构造 、顶 、底 板 岩性 变 化 ,掌 握 采 区 煤层 煤 质 的 变化 规 律 ,对 今 后 各煤 层 之 间 的 配 采 ,以 及 做好地 质工 作 的超 前预 测 ,具有 积 极重 要的 意 义。 本文 结 合生 产实 践 ,对12_1煤层 作了 研 究。     

Subsidence and rock creep in a cross-valley fill

Cross-valley fills composed cf waste rock from mining operations pose environmental concerns related to their long-term stability. A large (2.06×10⁷ m³) phosphate waste dump in southeastern Idaho was monitored from 1981 to 1988 for subsidence and horizontal displacement in conjunction with different surficial rock types and long-term precipitation patterns. Most of the 19 surveyed benchmarks on the dump face moved in the northeast direction during the 7-yr study period, roughly the same orientation as the aspect of the fill face. Average vertical subsidence rate decreased exponentially with time from a high of 0.15 m/yr in 1981–1982 to a fairly stable level of 0.008 m/yr by 1988. Net displacement similarly decreased from 0.19 m/yr shortly after dump construction to 0.023 m/yr by 1988. Both subsidence and net displacement were initially higher in the shale cap on the west side of the chert-filled dump; however, by 1986–1988 subsidence and displacement rates were actually lower in the shale material. Subsidence and net displacement appeared unaffected by temporal precipitation patterns; both subsidence and net displacement rates declined significantly during the very wet snowmelt seasons of 1983 and 1984. The temporal patterns of movement at the dump site suggest that the breakdown of the rock (especially shale) occurs primarily during the first 1.5 yr following dump construction. Periodic saturation of the upper 6 m of spoil occurred in nine of 60 neutron access tubes, normally during the spring snowmelt seasons. Saturation occurred at depths 1.8 m and is thought to be associated with uneven compaction or heterogeneities in the fill. Overall, the dump appeared to be internally well drained with rates of rock creep unaffected by seasonal water inputs.     

新疆也列莫顿地区小于赞浅成低温热液型金矿床地质地球化学

小于赞金矿赋存于下石炭统大哈拉军山组陆相火山岩中,矿体受火山－次火山岩体与ＮＷ向断裂构造的联合控制,呈脉状产出。元素地球化学异常为Ａｕ－Ａｇ－Ｈｇ－Ａｓ－Ｂｉ组合。该矿床属浅成低温热液型金矿床。     

徐州市矿山地质环境现状分区评估研究

以徐州市矿山地质环境调查资料为基础,选取矿山环境问题的10个负效应评估因子和矿山环境整治成效的3个正效应评估因子,采用综合指数评判法,对徐州市矿山地质环境现状进行分区评估。     

贵州水银洞金矿床成因探讨及成矿模式

水银洞金矿床为贵州20世纪90年代中期通过成矿预测发现的层控型隐伏矿床,为中国第一个Ⅰ勘探类型的卡林型金矿床。通过10年来的勘查,成为滇黔桂“金三角”继烂泥沟之后的又一个特大型金矿床。本文简要介绍了矿床基本特征,从岩性、蚀变、孔隙度、同位素、包裹体等几个方面进行了研究,对矿床进行了成因探讨、建立了矿床成矿模式,总结了找矿标志,以期对下一步区域找矿提供借鉴。