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《International Geology Review》2012,54(11):1042-1050
Minerals of the stibnite-antimonselite series, in close association with tiemannite, clausthalite, kullerudite, Se-bearing stibioluzonite, native gold, quartz, and barite, were discovered in Cambrian stratabound gold deposits at La'erma and Qiongmo, western Qinling, China. Based on S/(S + Se) ratios of microprobe analyses, the binary stibnite-antimonselite system is divided into four series: stibnite, Se-stibnite, S-antimonselite, and antimonselite. Micro-hardness of the stibnite series (Sb = 58.47 to 72.99 wt%, S = 11.86 to 28.76, and Se = 0.00 to 29.12) and the antimonselite series (Sb = 48.94 to 59.13 wt%, Se = 29.20 to 46.86, S = 1.99 to 11.43) is 101.26 and 103 kg/mm2, respectively. Representative reflectivities of the four series are (470 nm) Rg'= 42.62 to 47.62%, Rp' = 30.83 to 40.55%; (550 nm) Rg' = 41.84 to 46.75%, Rp'= 31.48 to 38.85%; (590 nm) Rg' = 42.25 to 46.63%, Rp' = 30.73 to 39.46%; (650 nm) Rg' = 43.30 to 46.48%, Rp' = 30.01 to 41.56%. Cell parameters obtained from two stibnite samples (containing 3 to 5% Se) are a = 1.1209 to 1.1212 nm, b = 1.1299 to 1.1303 nm, c = 0.3847 to 0.3849 nm; and those of S-antimonselite and antimonselite are a = 1.1591 to 1.1593 nm, b = 1.1724 to 1.1747 nm, and c = 0.3941 to 0.3984 nm. 相似文献
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中下扬子区二叠系露头层序地层研究 总被引：15，自引：1，他引：15
按新近国际年代地层划分方案（ICS，2000），下扬子区二叠纪地层自下向上分为3统，9阶和相对应的华南传统6阶划分。二叠系从阿瑟尔阶至长兴阶（44Ma)共划分出14个三级层序，每个三级层序平均时限约为3.14Ma，其中“紫松阶”）相当阿瑟尔＋2／3萨克马尔阶）1个（船山组中上部）、“隆林阶、（相当1／3萨克马尔阶＋阿丁斯克阶）2个（分别对应船山组上部和梁山组或镇江组）、“栖霞阶”（相当库班甘德阶＋1／3罗德阶）3个（栖霞组），“茅口阶”（相当于2／3罗德阶＋沃德阶＋卡皮丹阶）4个（孤峰组，茅口组，堰桥组，银屏组和武穴组），吴家坪阶2个（龙潭组或吴家坪组），长兴阶2个（长兴组或大隆组）；共归并为4个层序组（sequence set)。 相似文献
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封闭体系有机质与有机碳氢氮恢复动力学研究 总被引：3，自引：0，他引：3
在封闭体系的条件下,对典型的Ⅰ、Ⅱ、Ⅲ型干酪根在热演化过程中的损失进行生烃动力学研究,获得了Ⅰ、Ⅱ、Ⅲ型干酪根的总量、有机碳、氢以及氮质量损失动力学参数。用Kinetics软件计算了封闭体系干酪根有机碳丰度、氢碳原子比和氮碳原子比的恢复系数。认为在对高成熟—过成熟干酪根进行生烃评价时,Ⅰ、Ⅲ型干酪根残余有机碳丰度需要进行恢复,而Ⅱ型干酪根残余有机碳丰度不需要恢复。三种类型干酪根的氢碳原子比均需要进行恢复。 相似文献
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基岩裂隙水探寻是一项意义重大的研究课题,富水优势断裂的确定是其中的关键。文章详细论述了运用层次分析法寻找富水优势断裂并进行分级的实施方法。这一方法的实施可归纳为"两个前题条件,五个分析步骤,一个结果判断",两个前题条件为富水性功能分类和构建优势指标体系,五个分析步骤为构建层次分析结构模型、构造判断矩阵、层次单排序及其一致性检验、层次总排序、对象层权重总排序;一个结果判断为利用层次分析的结果进行断裂富水性分级,从而最终确定出富水优势断裂。此法为富水优势断裂的定量化评价提供了一种简洁、实用的新方法。 相似文献
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DENG Tian-long~ 《地球科学进展》2004,(Z1)
In this paper, the sequential extraction procedure was used for the selection of fractions of lead in seven stages corresponding to lead exchangeable, lead bounded to carbonates, to manganese oxides, to organic matters, to amorphous iron, and lead associated to crystallized iron, and to residuals. The vertical distributions of lead species were carried out in the soils related to good agriculture progress (GAP) of Chinese medical materials of Ligusticum chuanxiong Hort in Dujiangyan city and Wenchuan County, Sichuan Province. Based on those researches, it is found that the plant of Glycine Max (L.) Merr. has the character of lead enrichment and sorption, which is not reported in the literature. Using Glycine Max (L.) Merr. alternate planting with Ligusticum chuanxiong Hort is a valuable recommended in order to produce a high quality Chinese medical materials in order to eliminate the barrier on the beyond the lead limit for the import and export of Ligusticum chuanxiong Hort. 相似文献
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Landslide risk: some issues that determine societal acceptance 总被引：2，自引：1，他引：1
This paper illustrates approaches to landslide risk acceptance in various parts of the world in the context of the willingness to accept that risk, the willingness to pay to reduce the risk, and the willingness to alter the environment in the process. These factors are interlinked using the ternary ??willingness diagram?? which is also used to demonstrate how such willingness may change over time and to compare a range of generic approaches to landslide remediation as well as different conceptual approaches to landslide risk management. The willingness construct is intended to provide a readily understood framework for infrastructure owners and operators, amongst others, to understand how their approach to risk management compares with those in other regions, countries and contexts. Issues relevant to the response of society and groups of individuals to landslide risk, its acceptance and management include cultural factors, regulation and planning, budgetary constraints, vehicular vulnerability, and the often limited size of the event footprint compared to the vulnerability shadow that is cast are also discussed. 相似文献
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According to the latest International Chronostratigraphic Scheme (ICS, 2000), the Permian in the Middle-Lower Yangtze region of South China can e divided into three series and nine stages relevant to the traditional six stages of South China. From Assellian to Changxingian of Permian, 44 Main age range, the strata are composed of 14 third-order sequences, each of which is 3.14 Ma in average age range. There is one third-order sequence of Zisongian, equivalent to middle and upper Chuanshan Formation or equal to Asselian and two thirds of Sakmarian. There are two third-order sequences, corresponding to Liang-shan Formation or Zhenjiang Formation and upper Chuanshan Formation, which are assigned to Longlingian, coinciding with Artinskian and one third of Sakmarian. In addition, three third-order sequences, equal to Qixia Formation, are attributed to Chhsian, corresponding to Kubergandian and one third of Roadian. Four third-order sequences, comprising Gufeng, Maokou, Yanqiao,Yinping and Wuxue formations, are assigned to Maokouan, equivalent to two thirds of Roadian, Wordian and Capitanian. Two third-order sequences, equal to Longtan Formation or Wujiaping Formation, are included in Wuchiapingian. Other two third-order sequences, corresponding to changxing Formation or Dalong Formation, are assigned to Changhsingian. In brief, these above third-order sequences can be incorporated into 4 sequences sets. 相似文献
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地勘单位要吸引和留住人才,就要在事业、感情、待遇留人上下功夫.即营造鼓励人才干成事业、帮助人才干好事业、创造施展才华的社会氛围和环境;用来自领导的关心爱护之情,同事的团结友爱之情来拴住人心;为人才提供与其创新能力和贡献相适应的物质待遇,使人才充分享有实现自身价值的自豪感、贡献社会的成就感、得到社会承认的荣誉感. 相似文献
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M. Dolores Petit-Dominguez M. Isabel Rucandio Almudena Galan-Saulnier Rosario Garcia-Gimenez 《Journal of Geochemical Exploration》2008
Due to the high number of variables involved in mine profitability studies, it is often very difficult to establish connections among them in order to provide a blend of market saleable quality products. In this sense, analytical chemistry together with chemometry are essential and indispensable disciplines to tackle these studies. The aim of this work was to demonstrate the utility of these disciplines to carry out optimization studies of iron mines. For this purpose, one of the most important iron mines of the Iberian Peninsula was chosen, sited in the mountain range of Sierra Menera, near the location of Ojos Negros (Teruel, Spain). Geological, mineralogical and chemical composition of 148 samples was analyzed, corresponding to different depths of three drill holes (named TE1, TE2 and TE3). In particular, aspects concerning to chemical composition are very important, since the mean contents of certain elements, such as phosphorus, sodium and potassium, should be restricted to the established limits to prevent that companies can drive back the raw material if they do not fulfil the necessary requirements. On the other hand, the large number of analysed samples drove us to use a statistical processing of the data. Among other aspects, it provides a way to find possible connections among a high number of variables and classify samples into compositional groups sharing similar composition, in order to limit the mineralised area and to obtain enough information about the amount of those chemical elements associated to iron ores. Data obtained from all these analytical techniques were in good agreement and provide a methodology that can be of wide interest applied to different geological studies. 相似文献
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分析了以地表水、地下水与非点源为代表的水质模型研究发展历程,揭示了水质模型由经验-机理、单要素(或无机、大量、无毒要素)-多要素(或有机、微量、有毒要素)、单介质-多介质、稳态-动态、点源-非点源-两者统一研究、饱水带-包气带-二者统一研究、小规模分散(河流、湖泊、地下水等)-大规模集成(整个流域)、理论研究-实际应用研究的发展特点。认为当前水质模型正处于由水质研究向以水质为中心的流域管理研究转变的关键时期,给出了一个流域管理新模型WARMF的介绍与特点分析。 相似文献
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《Quaternary Research》2014,81(3):513-519
We developed a tree-ring chronology (AD 1446–2008) based on 75 cores from 37 Abies squamata Mast. trees from the Shaluli Mountains, southeastern Tibet Plateau, China, using signal-free methods, which are ideally suited to remove or reduce the distortion introduced during traditional standardization. This chronology correlates best with regional temperatures in June–July, which allowed us to develop a June–July temperature reconstruction that explained 51.2% of the variance in the instrumental record. The reconstruction showed seven cold periods and five warm periods. Cold periods were identified from AD 1472 to 1524, 1599 to 1653, 1661 to 1715, 1732 to 1828, 1837 to 1847, 1865 to 1876 and 1907 to 1926. Warm intervals occurred from AD 1446 to 1471, 1525 to 1598, 1716 to 1731, 1848 to 1864, 1877 to 1906 and 1927 to present. The reconstruction agrees well with nearby tree-ring-based temperature reconstructions. Spatial correlation analyses suggest that our reconstructions provide information on June–July temperature variability for the southeastern Tibetan Plateau and its vicinity. Spectral analyses revealed significant peaks at 2–6, 10.7, 51.2, 102.2 and 204.8 yr. The temperature variability in this area may be affected by ENSO, the Pacific Decadal Oscillation and solar activity. 相似文献
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湖南省探矿权、采矿权市场现状与发展对策 总被引：1，自引：0，他引：1
探矿权、采矿权市场是社会主义市场经济的重要组成部分．培育和规范探矿权、采矿权市场不仅是实现矿产资源利用方式和管理方式转变的根本途径，更是推动矿业经济全面开放。走向健康有序发展的强大动力．湖南省的探矿权、采矿权市场还不发育，与我国市场体制的发展进程和其他各类市场的建设进程相比，很难适应入世的需要．在对湖南省探矿权、采矿权市场现状进行深入分析的基础上，提出了解放思想、整顿秩序、明确政策、加强勘探。严格规划、加强领导等项措施来培育和规范我省探矿权、采矿权市场． 相似文献
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Nutrient loading to estuaries with heavily populated watersheds can have profound ecological consequences. In evaluating policy
options for managing nitrogen (N), it is helpful to understand current and historic spatial loading patterns to the system.
We modeled N inputs to Narragansett Bay from 1850 to 2000, using data on population, human waste disposal, livestock, fertilizer,
and atmospheric deposition. We found that total N loading to the bay increased 250% from 1850 to 2000, and 80% from 1900 to
2000. Loading to the upper bay increased far more than that to the lower bay, and the most important source shifted from non-point
animal waste to human waste concentrated at sewage treatment facilities. We also modeled future N loads in 2015 under four
management scenarios. Planned improvements in sewage treatment would reduce N loads 9% below business-as-usual, to the 1990
loading rate. Greater reductions, to circa 1900 rates of loading, may be possible. 相似文献
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钻进过程状态监测旨在实时描述钻进工况,判断运行性能优劣程度进行非优追溯,及时指导司钻人员调整作业操作,保证钻进过程安全、高效、稳定开展。钻进工况是钻进系统运行状态的反映,因此开展面向状态监测技术的钻进工况识别研究具有重要的理论和应用价值。本文针对钻进工况识别问题,基于状态监测数据,建立基于支持向量机的钻进工况识别模型,对钻进工况进行识别。综合工况识别结果,对钻进效率进行评估,并对影响钻进效率的因素进行讨论,寻找提升钻进效率的手段。最后,采用钻进现场实钻数据进行仿真实验,验证所提方法的可行性和有效性。 相似文献
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三江地区含锡花岗岩Rb—Sr等时线年龄 总被引：7，自引：1，他引：7
通过含锡花岗岩全岩Rb-Sr等时线年龄研究,哀牢山-金沙江锡矿带的含锡花岗岩形成于燕山中晚期(133～80Ma);临沧-左贡锡矿带的年龄范围648～370Ma,相当于徵江期到海西期;潞西-腾冲锡矿带,属于燕山晚期到喜山期(105～51Ma)。 相似文献
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基于差分干涉雷达的汶川地震同震形变特点 总被引：9，自引：8，他引：1
地震同震形变场是认识震源机制、确定发震断裂、分析发震断裂活动方式、评估震害损失及揭示未来发震趋势的重要依据。但在龙门山地区复杂的自然环境中, 现有的地震同震形变场获取方法(GPS测量、构造形迹分析、震源机制解结合数值模拟计算)难以快速、全面的捕捉到这种信息, 这突显出差分干涉雷达技术(D-InSAR, Differential Interferometry SAR)在同震形变场研究中的优势。本文介绍了其观测原理, 在地震同震形变监测中的研究现状, 并重点分析了已获取的D-InSAR汶川地震同震形变场的观测结果。基于差分干涉雷达观测及相关资料, 对龙门山断裂在本次地震中活动性进行了初步分析, 结果表明干涉雷达形变图像与地表破裂范围、逆冲角度的变化、上下盘升降关系及大型余震的展布存在很强的相关性。 相似文献
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软土型水泥土掺砂试验研究 总被引：4，自引：0，他引：4
考虑到土性对水泥土强度的影响，提出了在软土中掺砂以改进水泥土抗压强度性能的方法。选取深港西部通道填海区含有机质的淤泥，采用均匀设计法来考察水泥掺入比、砂的掺入比、龄期和水泥土抗压强度的关系；建立了其回归模型，研究了3个因素对强度的影响情况，给出了优化配比的方法；最后提出了改进机具以实现水泥土掺砂的设想。 相似文献
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湿陷性黄土增湿和减湿效应的探讨 总被引：1，自引：0，他引：1
湿陷性黄土的湿陷性不是一成不变的。土中含水率的变化产生的增湿和减湿效应,对黄土湿陷性影响很大。进行黄土湿陷性评价时,应注意以动态的观点和方法综合分析、预测增湿和减湿效应的不利影响,以便采取有效的处理措施,消除工程事故隐患。 相似文献