中国内蒙古白云鄂博Fe-Nb-REE矿床地质特征与陨石撞击成因

中国内蒙古白云鄂博Ｆｅ－Ｎｂ－ＲＥＥ矿床由于其独特的矿床地质与矿物地球化学特征而明显有别于世界上其它绝大多数的Ｆｅ、Ｎｂ、ＲＥＥ矿床。本文提出该矿床是约１５００Ｍａ前一块富含ＲＥＥ、Ｎｂ的铁陨石撞击在华北地台北缘碳酸盐沉积陆架上形成的。现在矿床矿体中心的块状铁矿石更多地代表了陨石的成分,矿体外侧富含ＲＥＥ、Ｎｂ的环状白云岩是陨石撞击浅海碳酸盐沉积陆架释放的巨大能量使海水（含Ｍｇ）迅速受热溶解陨石中的ＲＥＥ、Ｎｂ等形成的含金属热液蚀变沉积成因方解石质碳酸盐沉积物的结果。块状铁矿石和环状白云岩之间矿物成分异常复杂、结晶颗粒十分细小的条带状、侵染状Ｆｅ－Ｎｂ－ＲＥＥ矿石组成的矿体则是撞击瞬间导致的由陨石（Ｆｅ、Ｎｂ、ＲＥＥ）、海水（Ｍｇ、Ｎａ、Ｋ等）和碳酸盐（含少量硅质夹层）（Ｃａ、Ｓｉ、Ａｌ等）组成的超高温、多组分、富水体系在快速冷却条件下反应生成的产物。撞击释放的巨大热能,在撞击体（陨石）下部相对不易释放,导致部分碳酸盐沉积物在富含ＲＥＥ、Ｎｂ、Ｍｇ等的热液参与下融熔,然后侵入到周围岩石裂隙形成矿区内众多的富含ＲＥＥ、Ｎｂ的白云岩脉。撞击的瞬间导致大量岩石、矿物碎屑、海水、蒸汽弥漫天空,同时引发巨大的海啸,然     

龙海—漳浦沿海第四纪地层及沉积结构特征

本文根据实际调查资料，对研究区的第四纪地层层序进行了较系统地划，并初步探讨了第四纪地层的沉积结构特征。     

灰色系统在电敏感区法粒度分析曲线外推技术中的应用

根据TAI型库尔特计数器单管粒度分析结果,利用灰色系统建立GM(1,1)预测模型,对样品频率曲线进行外推处理,可获得小于仪器基线通道阈值颗粒的体积百分比含量,并将结果与入重-出重法测定结果进行对比,精度较高。为电敏感区法粒度分析资料的外推处理提供了新的方法。     

Transport patterns of micro nutrient elements from the continental shelf of the East China Sea to the Kuroshio area

On the basis of the in situ data of DO2, pH, SiO2. PO4-P, NO3-N and NO2-N collected in the north of the East China Sea during 1987-1988, the following points are mainly expounded.1.The inorgonic nutrients are obviously affected by continent runoff in the north of the East China Sea. Their distributions are characteristic of its distribution of terrigenous materials.2.There are three transport paths of nutrients from the shelf to the Kuroshio area. The first is mixing-diffusing-advec-tion and upwelling process, the process of biology and biochemistry belongs to the second, and the sinking process is the last one.3.The swing of the Kuroshio axis affectes both the range of the migration of substances through mixing-diffusing-advec-tion process and the upwelling degree of the subsurface Kuroshio water to the shelf.4.Most part of the substances sink as macroparticles to the deep layer before reaching the Kuroshio area.     

勉略带三岔子蛇绿岩的变质特征及构造意义

勉略带是近年来秦岭造山带研究中揭示出来的代表晚古生代小洋盆的缝合带 ,组成复杂 ,它们经历了不同的变质、变形改造 ,构成了不同构造背景、不同构造层次、不同物质组成、具不同 PTt轨迹的蛇绿构造混杂带。文中 PTt轨迹揭示 ,秦岭造山带勉略带三岔子蛇绿岩中的变质辉长岩是由上地幔先处于伸展背景下等温快速降压、后又经历缓慢降压快速降温上升侵位的。变形前的早期变质可能发生在 60～ 70 km处的上地幔 ,然后变质辉长岩快速“底辟”构造侵位 ,上升至约4 0 km深处 ,可能与俯冲的冷洋壳并置 ,发生快速降温退变反应 ;因俯冲作用的开始 ,抑制了洋盆快速扩张 ,变质辉长岩在减速伸展环境下继续抬升减压 ;后期又由于仰冲推覆 ,最终出露地表。此外 ,变质作用 PTt轨迹还反映勉略小洋盆洋壳厚度与标准大洋型洋壳厚度差异较大。     

Analysis of influencing factors on fine sediment flocculation in the Changjiang Estuary

Based on the test data in dynamic water and static water, the main factors, which influence the fine sediment flocculation, are analyzed with a gray model method of correlation theory. It is shown that the main influencing factors are water temperature, settling time, salinity, grain size, sediment concentration and current velocity according to the correlation coefficients. Among them, the salinity and the sediment grain size are critical type influencing factors (CrTIF); the settling time, the sediment concentration and the velocity are continuous type influencing factors (CoTIF); and the water temperature has the characteristics of both. When the critical values of CrTIF are reached or exceeded, the fine sediments will be flocculated, but values of CrTIF will not influence the settlement strength of floes. The influence of CoTIF is continuous. The values of the CoTIF will not only influence the occurrence of flocculation but also the settlement strength of the floes.     

Division of hydroclimatic area over China seas——Ⅰ. Principal component analysis

ＤｉｖｉｓｉｏｎｏｆｈｙｄｒｏｃｌｉｍａｔｉｃａｒｅａｏｖｅｒＣｈｉｎａｓｅａｓ──Ⅰ．Ｐｒｉｎｃｉｐａｌｃｏｍｐｏｎｅｎｔａｎａｌｙｓｉｓ￥ＣｈｅｎＳｈａｎｇｊｉａｎｄＹａｏＳｈｉｙｕ（ＲｅｃｅｉｖｅｄＡｕｇｕｓｔ１，１９９３；ａｃｃｅｐｔｅｄＳｅ...     

无氧功实验适宜负荷确定方法的研究

为更准确的确定自行车无氧实验的适宜负荷，对４３名（１５岁～２１岁）受试者进行了Ｗｉｎｇａｔｅ法无氧功复实验，并对三种间接推算无氧功率适宜负荷的方法进行了比较。结果显示：用直接筛选法确定的适宜负荷与体重、腿围、腿力均高度相关。但与腿力的相关程度最高，与腿围的相关程度次之，与体重的相关程度最低。作者认为，体重、大腿围只能间接的反映腿部力量。用形态系数法和Ｗｉｎｇａｔｅ法确定无氧功率实验适宜负荷时，其准确性易受肌肉质量、训练水平等个体差异的影响。腿力百分比法确定的适宜负有适合于各个项目不同层次的受试者。腿力百分比法会成为一种新的更为准确的无氧功率实验适宜负荷间接确定法。     

能谱仪(EDS)测试结果中元素含量异常的研究

在EDS定量分析中,有时会见到某些元素(Si、Fe、Al、Cr等)含量的异常现象。能谱仪的测试研究表明,引起异常的主要因素有:标样选用不当,磨料污染,试样中的包体,矿物天然表面吸着的Si、Fe胶态薄膜,被测矿物周围邻接物质成分的影响,被测物质厚度过小或样品表面的复盖物等;对不同因素的影响效果可采取相应的对策给予减小或消除。