内蒙古新地沟金矿床黄铁矿热电性特征及深部找矿意义

内蒙古新地沟金矿是中型绿岩型金矿床,但已属于严重资源危机的矿山,急待寻找接替资源,因此对新地沟金矿床进行深部远景预测具有十分重要的意义。本文根据找矿矿物学和成因矿物学理论,利用显微镜、电子探针及热电仪系统分析新地沟金矿床不同标高和矿段中黄铁矿的热电型标型特征,研究结果表明:新地沟金矿床中黄铁矿的晶型以立方体、五角十二面体及聚形为主;热电系数变化主要集中在-331.10~340.20μV·°C~(-1)范围内,导电型多以N型为主,约占总含量的80%;成矿温度主要集中于250~340℃,属于中温矿床。黄铁矿热电性参数XNP变化范围较大,估算矿体剥蚀率为67.96%~74.31%。通过对黄铁矿导型的空间分布规律和矿体剥蚀分析表明:油篓沟矿段位于矿体中底部,向深部可能有小规模延伸,小西沟矿段钻孔ZK106在深部有较大规模的延伸,其矿化前景最好;小西沟矿段钻孔ZK102深部矿化前景次之;大汗青矿段钻孔ZK_2802其深部矿化前景较差。综合分析认为,该矿床深部具有较好的找矿潜力。     

四川盆地干旱动态评估指标的研究

在仔细分析干旱灾害物理成因基础上,围绕定量化和实时化这一核心,根据土壤水分盈亏原理,建立了具有清晰的物理意义的干旱动态评估指标。经检验,该方法符合实际,简便可行。     

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China’s Belt and Road Initiative in Support of the Resourcing Future Generations Program

The Resourcing Future Generations (RFG) program is a global strategy proposed by the International Union of Geological Sciences to meet global demand for natural resources. The Belt and Road (B&R) initiative of China provides a great opportunity for promoting the RFG across much of the Eurasian continent. The countries covered by the B&R initiative are mostly low-income economies. With rapid developments of economy and infrastructure construction, these countries are set to have huge demands for mineral resources in the future. However, the proven mineral reserves in this region are too limited, and the region’s overall level of metal recycling is far from optimistic. These countries are expected to have obstacles in meeting future demands. However, the regional Tethyan metallogenic domain and Central Asia metallogenic district are key areas for new discoveries of mineral resources, possessing a variety of mineral resources with a positive prospecting potential. The B&R initiative of China provides favorable opportunity for mutual beneficial cooperation to improve regional exploration and prospecting through geological mapping, inter-comparison study on Tethyan metallogenic domain, joint assessment of mineral resource potentials, joint training of geological engineers and workers and building information systems.     

Time-averaged sub-layer concentration profiles in oscillatory sheet flows

Although thin on the order of several to tens of millimeters, sheet flows normally comprise a lower pick-up sub-layer and an upper contact-load sub-layer, separated at the bed level (z = 0). The time-averaged concentration profile in the pick-up sub-layer shows a ‘convex upward’ curvature, but ‘concave upward’ shape characterizes the time-averaged concentration profile in the contact-load sub-layer. The time-dependent concentration in the contact-load sub-layer is approximately in-phase with the free stream flow velocity, whereas it is nearly in anti-phase with the free stream flow velocity in the pick-up sub-layer. Two distinct analytical expressions of the time-averaged concentration profiles for the respective sub-layers are proposed. The expressions are validated with detailed observation datasets collected in the Groβer Wellenkanal (GWK) prototype wave flume in Hannover, Germany. The agreement between the predicted and the measured values is excellent. Interparticle collisions in the pick-up sub-layer and convective lifting processes associated with vortex shedding in the contact-load sub-layer are considered responsible for the opposite curvatures and in-phase/anti-phase concentration variations. Both transitional boundary and reference concentration are also elaborated.     

陕西省铧厂沟金矿床主矿带黄铁矿热电性特征及其地质意义

陕西省铧厂沟金矿是一个主要赋存于海底基性火山喷流细碧岩中的金矿床。文中系统研究了该矿床主矿带黄铁矿的热电性特征。主矿带成矿温度主要集中在130~330 ℃,属中-低温矿床;黄铁矿导电类型从早期到晚期由N 型向P 型转变;P型黄铁矿出现频率从浅部到深部呈减小趋势;金品位高值区与P型黄铁矿的高值区及热电系数离散度的低值区相对应;主矿带黄铁矿热电导型及热电性参数特征反映出主矿带开采区位于矿体中部偏下,向深处仍有一定规模的延伸。综合分析认为,0至2勘探线深部以及22~26勘探线深部发现新的富矿段的可能性较大。     

吉安地区发展琯溪蜜柚气候可行性初步分析

为了进一步调整以柑桔为主的果业结构,增加市场水果的花色品种,提高果业种植的经济效益,1991年冬季发生柑桔大冻后,地处吉泰盆地的泰和、万安等县先后引进了少量的论溪蜜抽,近两年开始挂果,其中个别农户效益明显,因而引起地、县领导的重视,并组织了县市领导和科技干部到产地参观考查,初步计划大量引种。溪蜜抽是芸香料柑桔届油类中的珍品,福建省平和县指溪流域西圃地区这种袖子有五百多年的栽培史。以皮薄、汁多、色美、味香、核小、果大、爽口、酸甜适中、化渣、耐贮而驰名,与荔枝、福桔齐名,为闽省三大名果之一。清朝乾隆年间…     

塔中I号坡折带上奥陶统台缘礁滩复合体建造模式

塔中Ⅰ号坡折带的台缘高能区发育上奥陶统良里塔格组礁滩体,主要包括生物礁丘、灰泥丘、粒屑滩、滩间海等沉积类型,纵向上表现为粒屑滩、灰泥丘、礁丘的多旋回组合。单个礁滩复合体下部发育粒屑滩,上部为灰泥丘和(或)礁丘,之上为下一旋回的粒屑滩亚相所覆盖。横穿宽3～10km的区域,特别是台地边缘向陡坡转折的高地为礁生长相对集中区,而向内侧则更多出现滩相。不同沉积期礁滩单元分布范围不同,从良三段到良一段沉积期间内呈现逐步向塔中Ⅰ号坡折带迁移的缩减趋势。经后期多次成岩作用和构造破裂的改造,形成沿台缘分布且具有非均质性变化的礁滩型储层。     

冀中坳陷文安斜坡潜山带天然气成因与成藏特征

冀中坳陷潜山天然气是渤海湾盆地深层—超深层油气勘探的重要领域，文安斜坡潜山带则是冀中坳陷深潜山天然气勘探的主战场，但关于文安斜坡潜山带内、中、外三个不同含气带的油气来源、成藏期次和成藏过程等缺乏系统研究。本文在对各带天然气组分、碳同位素、稀有气体同位素和轻烃化合物等分析的基础上，探讨了天然气的成因与来源，利用流体包裹体方法厘清不同潜山带油气成藏充注过程，继而建立了油气成藏模式，并对比分析不同含气带油气成藏差异性。结果表明，文安斜坡潜山带内带天然气为高—过成熟的油型气，主要来源于Es4 +Ek烃源岩，储层经历了两期不同成熟度的天然气充注过程；中带天然气主要为煤型气，主要来源于石炭- 二叠纪煤系烃源岩，混有部分Es4 +Ek烃源岩生成的天然气，具有两期油气充注过程；而外带天然气为低成熟阶段的生物- 热催化过渡带气经氧化改造而形成的次生生物气，主要来源于石炭- 二叠纪烃源岩，仅经历了一期天然气充注过程。综合分析表明，文安斜坡潜山带发育双源供烃- 断层不整合输导- 分带差异聚集的油气成藏模式，内、中、外三个含气带分别发育单向单源供烃似层状高—过成熟气藏、双向双源供烃断溶体成熟—高成熟油气藏以及单向单源供烃层状低熟- 生物气藏三种油气藏类型。本文结果为深化对该区天然气来源、成藏规律的认识和后续勘探领域的拓展提供有益的信息。     

四川盆地避旱时段的诊断分析及干旱胁迫分型

利用干旱动态评估模型,设计出评估干旱胁迫程度的干旱胁迫指数,并分析了各地避旱时段。根据避旱时段的不同,确定了四川盆地的干旱胁迫分型。同时还研究了不同等级避旱时段的分布规律,为农业生产的合理布局提供了重要的科学依据。