惠民南部地区油气运移通道组合类型及其成藏作用

根据油气单一运移通道特征,建立惠民凹陷南部地区油气运移通道组合类型,并系统总结其成藏作用.结果表明:惠民凹陷南部地区主要发育连通砂体、断层及不整合3种油气运移通道,形成了砂体—断层—砂体、砂体—断层—不整合和砂体—不整合3种组合类型;这些组合类型不仅控制了油气运移模式,发育反“Z”字型输导运移模式、阶梯状输导运移模式等,而且控制了油气空间分布特征;砂体—断层—不整合型和砂体—不整合型决定曲堤地区油气具有“多层系分布、油气藏类型多样、运移距离远”的特征;单一的砂体—断层—砂体组合类型决定钱官屯地区油气具有“单层系分布、油气藏类型单一、运移距离近”的特点.     

青海德合龙洼铜金矿床成矿流体特征

通过流体包裹体岩相学、显微测温学和包裹体稀土元素分析,研究青海德合龙洼铜金矿床成矿流体性质和演化.研究结果表明;流体包裹体主要为气液两相包裹体,另有少量液相包裹体;包裹体气相成分主要以H2O和CO2为主.流体包裹体的均一温度为327～367℃,流体盐度为3.4%-6.4%,流体密度为0.55～0.88 g/cm3,为中高温、低盐度、中等密度和中等压力的成矿流体;石英和黄铁矿包裹体中,轻稀土富集,重稀土亏损,具有负铕异常.     

1965-2013年黄土高原地区极端降水事件时空变化特征

基于黄土高原地区52个气象站点1965-2013年逐日降水数据,辅以一元线性趋势分析、相关分析、Mann-Kendall检验及反距离加权插值(IDW)等方法,本文分析了黄土高原地区极端降水事件时空变化特征.结果表明:1)时间上,持续性指标和强度指标中除降水强度(SDⅡ)外均呈现减小的趋势;绝对指标和相对指标中除R10 mm降水日数(R10 mm)外,其他指数均呈现增加的趋势,但均未通过0.05显著性水平检验.2)空间上,就持续性指标来看,连续无雨日数(CDD)增加趋势最大的位于区域Ⅲ,连续降水日数(CWD)和年降水总量(PRCPTOT)在区域Ⅱ的北部的增幅最大;强度指标中,1d最大降水量(RX1 day)和5d最大降水量(RX5 day)在区域Ⅱ的中部和北部增幅最大,SDⅡ增幅最大的地区主要集中在区域工和区域Ⅱ的北部地区;绝对指标中,R10 mm、R20 mm降水日数(R20 mm)和R25 mm降水日数(R25 mm)的趋势变化呈由南向北增加的趋势;相对指标中,异常降水日数(R95p)和极端降水日数(R99p)增幅最大的地区主要集中在区域Ⅱ.3)CDD与经度、纬度呈显著的负相关,年降水总量(PRCPTOT)、R10 mm和R25 mm与纬度呈显著正相关,其他极端降水指数与经纬度和海拔高度的相关性不显著.4)主成分分析的结果表明2类极端降水指数的总贡献率达到80.73％,除CDD外,其他极端降水指数与PRCPTOT均具有良好的相关性,且均通过了0.01显著性水平检验.5)Hurst指数结果表明黄土高原地区CDD、SDⅡ、R10 mm、R20 mm和R25 mm极端降水指数变化均呈反向变化特征,其他极端降水指数呈同向变化特征.     

Mo isotopes in the Lower Cambrian formation of southern China and its implications on paleo-ocean environment

Over the past decade, as one of nontraditional stable isotopes, Mo isotope has developed rapidly and now become an important geochemical proxy to trace paleo-oceanic and atmospheric evolution through geological history. In this paper, Early Cambrian formations in southern China are investigated. The results indicate that δ 97/95Mo values of Early Cambrian seawater may have been larger than 1.4‰, values that are close to those of the modern ocean. It was also found that the variations in Mo isotope composition in samples from two sections （Huangjiawan and Gezhongwu in Guizhou） were closely related to changes in redox conditions during sedimentary processes. Combining our results with existing data, a preliminary model for the evolution of seawater Mo isotope composition through geological history was provided. It indicated that Mo isotopic variations were generally consistent with the evolution of atmospheric oxygen.     

Climatic significance of δ18O records from precipitation on the western Tibetan Plateau

Analysis of daily precipitation samples for stable oxygen isotopes （δ^18O） collected at the Shiquanhe and Gerze （Gaize, Gertse） stations in the Ngari （Ali） region on the western Tibetan Plateau indicates that air temperature affects the δ^18O variations in precipitation at these stations. In summer, Shiquanhe and Gerze show strongly similar trends in precipitation δ^18O, especially in simultaneous precipitation events. Moreover, both stations experienced low δ^18O values in precipitation during the active monsoon period, resulting from the southwest monsoon （the summer phase of the Indian monsoon）. However, during the break monsoon period （during the summer rainy season, when the monsoon circulation is disrupted）, δ^18O values in summer precipitation remain relatively high and local moisture recycling generally controls the moisture sources. Air temperature correlations with δ^18O strengthen during the non-monsoon period （January--June, and October--December） due to continental air masses and the westerlies. In addition, evaporation also influences the δ^18O variations in precipitation. The observed temporal and spatial variations of δ^18O in precipitation on the western Tibetan Plateau and adjacent regions show that the late May and early June-the late August and early September time frame provides an important period for the transportation of moisture from various sources on the Tibetan Plateau, and that the region of the West Kunlun-Tanggula Ranges acts as a significant climatic divide on the Plateau, perhaps for all of western China.     

Pulleniatina Minimum Event during the last deglaciation in the southern South China Sea

The planktonic foraminiferal faunal census of core MD 05-2894 （7°2.25′N, 111°33.11′E, water depth 1982 m）, retrieved from the southern South China Sea （SCS） during the ＂Marco Polo＂ cruise in 2005, was performed to investigate the abundance changes of a subsurface dweller, Pulleniatina obliquiloculata. The results display that the abundance of P. obliquiloculata nearly declines to zero during 16.0--14.9 ka, corresponding to the Heinrich 1 （H1） cold interval. The unexpected decrease of P. obliquiloculata occurs in the adjacent cores, roughly between 17 and 14.8 ka based on the previous studies. Accordingly, the Pulleniatina Minimum Event in the last deglaciation can serve as a good stratigraphical indicator, at least in the southern SCS. To further explore the changes of sea surface temperature （SST） and subsurface seawater temperature （SSST）, we made parallel Mg/Ca measurements on surface dweller Globigerinoides tuber and subsurface dweller P. obliquiloculata tests. Since the last deglaciation, the SSTs show a continuous increasing trend towards the late Holocene, while the warming of the subsurface water is punctuated by a 2℃-cooling interval across the deglacial Pulleniatina Minimum Event. Both increased 5180 differences between G. ruber and P. obliquiloculata, and increased temperature differences between surface and subsurface water suggest a shoaling of the mixed layer during the deglacial Pulleniatina Minimum Event. Therefore, we consider that the significant changes in the upper ocean structure are responsible for the Pulleniatina Minimum Event during the last deglaciation in the southern SCS.     

青藏高原东北部西宁盆地中始新世-渐新世沉积物颜色与气候变化

始新世-渐新世是古近纪气候变化中最显著的时期.通过对西宁盆地42.5～26.0 Ma沉积物颜色指标的详细分析,发现颜色参数L*,a*,b*曲线明显以32.8 Ma为界分为上下两段.其中:L*值在下段(42.5～32.8 Ma)波动剧烈并呈缓慢降低趋势,至32.8 Ma左右大幅度降低,此后(32.8～26.0 Ma)波动变小、稍有回升;a*,b*值则与L*值的变化趋势相反,在下段(42.5～32.8 Ma)呈逐渐增大趋势,剧烈波动,在32.8 Ma左右时突然大幅度升高.至上段波动变小.结合西宁盆地孢粉、有机质及CaCO3质量分数变化的特征分析,该区域在32.8 Ma时可能发生大幅度的降温事件(对应于海洋记录所揭示的Oi-1事件),此事件之前气候干旱程度相对较弱、氧化作用逐渐增强、气候波动剧烈.在Oi-1事件之后大陆性干旱程度增强、氧化强烈、气候波动幅度较小.这是在该区高分辨率获得Oi-1事件前后气候变化的记录.它对始新世-渐新世全球气候变冷背景下陆地系统响应研究具有重要意义.     

有氧运动锻炼在防止高原老年人早衰中的意义

久居高原的老年人,随着年龄增长易发生"早老、早病、早衰"现象.从而影响老年人的生活质量.适宜的运动锻炼有益健康,特别是对老年人有延缓衰老的作用.就此探讨一下有氧运动锻炼在预防高原老年人早衰中的意义.     

青海省高校构建民族传统体育特色俱乐部的模式探析

本文从体育学、社会学、民俗学、经济学的角度,结合青海省各民族传统体育运动项目特点与青海高校教学现状和学生实际,分析建立具有民族传统体育教学俱乐部的可行性和必要性,进而构建青海省高校民族传统体育俱乐部的运行模式.     

青海省大场金矿床地质特征及找矿远景分析

阐述了青海省大场金矿区地质特征(包括区域背景、地层、构造、岩浆活动等);其赋存于厚度巨大的三叠纪浅海相陆源碎屑沉积岩中,金矿体受断裂构造蚀变破碎带的严格控制。探讨了金矿矿床地质特征和矿区地球物理和地球化学特征,并研究了成矿模式,分析了找矿远景。