河南省崤山地区崤山岩群的建立及其与邻区对比     

常云真  黄芮  贾慧敏  王琦  张世豪 《世界地质》2018,37(4):1077-1084

河南省崤山地区的地层具典型地台型双层结构,其结晶基底为一套中深变质岩系,前人将其解体为两部分:一部分为太古宙变形变质花岗岩系(TTG--G),不具地层意义;另一部分为呈残留顶盖或包体形式残存于TTG--G中的壳岩系,并将其划分为新太古代兰树沟岩组和杨寺沟岩组。通过2009—2014年开展的1∶5万矿产地质调查工作,将这一套表壳岩新建为新太古代崤山岩群,可与登封地区的新太古代登封岩群对比。  相似文献   

顶空毛细管气相色谱法测定水中碘化物     

魏华  宫彧 《黑龙江国土资源》2006,(1):45-45

在酸性条件下水中的碘化物可被重铬酸钾氧化成I2，I2与丁酮反应又生成3-碘-2-丁酮。本文根据3-碘-2-丁酮易挥发的特性采用顶空进样技术，结合毛细管气相色谱法（CCC）分离微池电子捕获检测器（μ-ECD）检测，建立了一种测定水中碘化物的方法，该方法操作简捷，检测限低，检测范围宽，结果令人满意。  相似文献   

THE COAL FIELD OF MENTOUKOU,WEST OF PEIPING     

王竹泉  計榮森 《地质学报》1933,(0)

The Western Hills of Peking are,since very remote times,well knownfor coal production and Mentoukou is one of the most productive districts amongthese hills.On account of its economic importance it was visited by several  相似文献   

龙门山地区的巨型冰川漂砾     

《四川地质学报》2000,20(3):240-240,239

在彭州市的葛仙山、白鹿顶、天台山 ,什邡大垭口等十多处山顶上被前人定为“飞来峰”的石灰岩 ,地质时代是石炭—二叠纪 ,它们压在较年轻的不同地质时代地层之上 ,被压的最新地层是第四纪更新世砂砾岩层。这些石灰岩的岩性单一 ,远望外表露头与其它地区石灰岩地表露头没有太大的区别 ,但岩石内部则区别较大 ,葛仙山等处的石灰岩具有充分发育的网状裂隙 ,以锤击之则破碎呈粒状或岩粉状 ,开采十分容易。在葛仙山等处约 2 0 0ｋｍ2 内的“飞来峰”石灰岩 ,其破碎程度是一致的。对其成因 ,在地质界有较多的说法。近年来以韩同林为首的地质研究小…  相似文献   

皖中浮槎山地区北将军(岩)组的确定及其意义     

许卫  童劲松  胡海风  王有生  陈秀其 《安徽地质》2001,11(1):19-23

皖中浮槎山地区南延部分以大黄山一带为代表，出露一套基本未变质地层，据岩石组合、变质程度、微古化石等特征综合分析，认为其应为北将军(岩)组，可与张八岭地区的北将军(岩)组进行对比，进一步将其分为两个(岩)段：下(岩)段为碳酸盐岩，上(岩)段为碎屑岩。  相似文献   

云南拱丁金矿中富银黄铜矿的初步研究          下载免费PDF全文

韩秀伶  丁奎首 《地质科学》1997,32(4):521-523

富银黄铜矿发现于云南省沧源佤族自治县斑洪乡拱丁金矿石英脉内,该矿是以金(银)为主的多金属硫化物矿床。共生矿物有自然金、银金矿、自然银、银黝铜矿及辉锑铅银矿等。  相似文献   

全球下奥陶统-中奥陶统界线层型候选剖面——宜昌黄花场剖面研究新进展   总被引：1，自引：0，他引：1  

汪啸风 Stouge S．陈孝红  李志宏王传尚 ErdtmannB．-D．曾庆銮  周志强陈辉明张淼  徐光洪 《地层学杂志》2005,29(B11):i0003-i0008

湖北宜昌黄花场剖面是我国奥陶系大湾阶的界线层型剖面，高精度生物地层以及岩石、层序地层和碳同位素地球化学的综合研究表明，该剖面完全符合关于建立全球下奥陶统一中奥陶统界线（即奥陶系第三个尚待正式命名的阶）界线层型剖面和点位（GSSP）的条件。建议以该剖面牙形石Baltoniodus？triangularis的首现层位，作为划分全球下奥陶统一中奥陶统界线的GSSP。所建议的GSSP交通方便，位于距宜昌市北北东22km的公路旁，地层出露完美无缺，界线生物层位于大湾组下段SHod-16层底部，距大湾组底部10．57m；界线上下发育了B．？triangularis的完整演化序列，并伴生有极好的Baltoniodus、Trapezognathus、Periodon和Microzarkodina等牙形石属种演化序列来作为佐证；界线之上0．2m所出现的世界广布的Microzarkodina abellum可作为划分此界线的辅助标志。界线生物层位于低位海侵序列之中，界线之下0．6m处所显示的从高位到低位的层序转换面和碳同位素最大偏移，与全球此时所发生低位事件密切相关，可作为识别该界线的物理和化学标志。所建议的界线生物层与笔石Azygograptus suecicus生物带上下组合之间的界线接近，与几丁虫Belonechitina cf．henryi生物带底界几乎一致，因此，所建议的界线易于在全球，无论浅水碳酸盐相、还是深水笔石相，识别和进行精确对比。同样的生物组合序列和层序及碳同位素异常亦在黄花场剖面之北5km的陈家河（即大坪）剖面得到了验证．  相似文献   

西秦岭南缘“白水江群”微古生物化石的发现及其地质意义   总被引：3，自引：0，他引：3  

王涛王宗起  高联达姜春发  闫全人闫臻 李秋根 《地质论评》2006,52(5):586-590

在西秦岭南缘“白水江群”灰色灰黑色粉砂质、泥质板岩中发现隐孢子、小孢子、疑源类、几丁虫和虫颚等微古生物化石，这些化石的许多属和种，时代为中志留世温洛克阶至晚志留世早期卢德洛阶。微体古生物化石的发现对客观认识和解释“白水江群“由不同时代的岩石组成的混杂带提供了新的依据。  相似文献   

龙门山地地区泥盆纪层序地层及海平面变化——以四川北川桂溪剖面为例   总被引：1，自引：0，他引：1  

陈留勤 《西北地质》2007,40(4)

志留纪末期的加里东运动使扬子板块与华夏板块基本上拼接联合为统一的华南板块,由于古特提斯洋北支向东扩张,泥盆纪时龙门山地区形成华南板块西北缘的被动大陆边缘.在这个比较稳定的构造背景下,以桂溪剖面为代表的稳定类型泥盆系大致可以划分为18个三级沉积层序(DS1-DS18),进一步可以归并为2个二级构造层序,对应于两次海侵高潮.层序地层划分表明龙门山地区在泥盆纪经历了一个从海侵作用初期的海侵碎屑岩沉积 (DS1-DS9) 到高水位碎屑岩和碳酸盐岩混合沉积 (DS10-DS12),再到海退期清水碳酸盐岩沉积 (DS13-DS18) 的有规律的沉积演变过程,从而形成了一个复杂而有序的层序地层序列.这种沉积演变规律及海平面变化与隔陆相望的滇黔桂地区的泥盆系具有相似性.但龙门山地区的泥盆系比滇黔桂地区发育齐全,厚度更大,所以后者的泥盆系只能划分出13个三级层序.  相似文献   

Macro-and Micro-Structures of Heavy Fogs and Visibility in the Dayaoshan Expressway          下载免费PDF全文

吴兑  邓雪娇  毛节泰  毛伟康  叶燕翔  毕雪岩 《Acta Meteorologica Sinica》2007,21(3):342-352

Belonging to the southern subtropical moist type of monsoon climate,the Nanling mountainous area experiences heavy fogs whenever quasi-stationary fronts appear there from September to May.There can be as many as 15-18 days of heavy fogs per month.Fogs have more serious consequences in the Lechang-Ruyuan section of the Beijing-Zhuhai Expressway(the longest expressway in China)that passes through the main part of the Nanling Mts.,where the road rises from 200m to more than 800m above sea level(ASL).For a major motorway in the mountainous areas of Nanling Mts.,two multidisciplinary integrated field observations were carried out,which measured visibility by the naked eyes,visibility by instrument,spectrum of fog- drops,liquid water content(LWC)of fog,tethered sounding,dual-parameter low-level sounding,turbulence diffusion within fog layers,aerosol spectra of size and composition,sampled fog water compositions,and sampled rainwater compositions.Typical cases were probed for their analyses of synoptics,micro- and macro-structures and microphysics.It is understood that heavy fogs take place with high frequency in the area and bring about serious consequences.Being typical advection and upslope fogs,they are in essence low-lying clouds appearing at high altitudes,which are closely related with the activity of South China frontal processes,especially the South China quasi-stationary fronts,and reflect on the role of local terrain as well.The heavy fogs are characteristic of long duration,extremely low visibility,well-organized lump- shaped structure,large-size fog-drops,moderate concentration,high LWC,and stronger turbulent diffusion within the fog layers than in fine sky.They differ much from radiation fogs,which are better documented in previous study in China.It is found that fog LWC is in significant anti-correlation with visibility so that large LWC is associated with small visual range.It is also noted that one of the reasons for the fluctuation of characteristic quantities of micro-structure such as the LWC of fog in the area is,in addition to the inhomogeneous structure of the fog itself,the effect of advection and inhomogeneous underlying surface; during the translation of fog with the ambient wind,irregular upslope and cross-over movement is another reason for the inhomogeneous structure and fluctuation of fog.The spectrum of the aerosol size displays itself as the power function of monotonous descent.The concentration of submicrometer particles is even higher.The high-concentration sulfate particles found in the aerosols of Nanling Mts.are actually good nuclei for condensation,which are favorable for the formation of fog.The presence of fog can help cleanse the trace compositions in the atmosphere so that fog droplets contain high levels of polluting elements.In the meantime,compared to cloud droplets,fog droplets are easier to be captured by the vertical surfaces of objects on the land surface,such as vegetation and buildings to constitute another kird of cleansing process. In vast stretches of forest like the Nanling Mts.,this kind of cleansing may be quite important.Studying the characteristic variation of fogs in the area realistically assists in setting up a forecast and warning system for local fogs and provides basic information for fog dispersal experiments.  相似文献