攀西地区铂族元素地球化学异常分布及其筛选   总被引：1，自引：0，他引：1  

任光明  李佑国  陈旭  骆耀南  费光春  包凤琴  陈杰 《地质与勘探》2008,44(1):62-66

攀西地区不同时代地层的水系沉积物中铂族元素地球化学背景值具有明显的规律性分布.笔者通过对该地区铂族元素含量在各地层中的分布以及地球化学异常的圈定、归并和分类,结合有关铂族矿床地球化学特征的认识,通过对水系沉积物中Pt、Pd综合异常的筛选,在铂族元素综合衬值异常图的基础上共划分出Ⅰ类异常4个、Ⅱ类异常19个、Ⅲ类异常23个以及Ⅳ类异常14个.初步筛选出的19个Ⅱ类异常子区可为进一步开展铂族矿床找矿工作提供依据.  相似文献   

人工合成烃类包裹体研究进展   总被引：4，自引：0，他引：4  

陈勇  葛云锦 《地质论评》2008,54(6):807-813

人工合成烃类包裹体不仅可以作为分析仪器校正的标样,还可以增进人们对烃类包裹体形成机制和水—岩作用机理的认识。人工合成包裹体的方法主要有三种：人工晶体生长法、焊封石英管法和金刚石压腔法,其中利用愈合人工石英(水晶)单晶裂隙合成流体包裹体技术已成为标准的合成技术。目前人工合成烃类包裹体主要利用晶体生长法合成,包括高温高压利用石英（或方解石）晶体生长愈合裂缝形成流体包裹体和低温下采用过饱和溶液重结晶形成流体包裹体。由于高温高压条件下烃类可能发生裂解,母液保真是成功实现人工合成烃类包裹体的重要前提条件。国外在人工合成烃类包裹体研究方面已经取得了一些重要的认识,但远不及人工合成无机体系流体包裹体研究那样系统和完善。国内关于人工合成烃类包裹体研究尚处于起步阶段,迫切需要开展这方面的研究工作。  相似文献   

Linear magnetic anomalies and tectonic development of the middle Okinawa Trough     

Liang Ruicai  Wu Jinlong  Liu Baohu  Wang Yong  Wang Shugong 《海洋学报(英文版)》2001,20(1):105-116

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＯｋｉｎａｗａＴｒｏｕｇｈ (ＯＴ) ,ｌｏｃａｔｅｄｎｏｒｔｈｗｅｓｔｏｆｔｈｅＲｙｕｋｙｕＴｒｅｎｃｈａｎｄｔｈｅＲｙｕｋｙｕｇｕｎｔｏ ,ｅａｓｔｏｆｔｈｅＥａｓｔＣｈｉｎａＳｅａｓｈｅｌｆ,ｉｓａｂａｃｋ ａｒｃｂａｓｉｎｂｕｌｇｅｄｔｏｔｈｅＲｙｕｋｙｕＴｒｅｎｃｈ .ＴｈｅＯＴｅｘｔｅｎｄｓｆｒｏｍＫｙｕｓｈｕｉｎｔｈｅｓｏｕｔｈｗｅｓｔｏｆＪａｐａｎｔｏｔｈｅＩｌａｎＰｌａｉｎｉｎｔｈｅｎｏｒｔｈｅａｓｔｅｒｎＴａｉｗａｎ ,Ｃｈｉｎａｉｎｔｈｅｓｏｕｔｈｗｅｓｔ…  相似文献   

Synthetic echograms generated from the relative frequency response   总被引：1，自引：3，他引：1  

Korneliussen  Rolf J; Ona  Egil 《ICES Journal of Marine Science》2003,60(3):636-640

  相似文献   

1990年12月14日台湾强震的预报判据     

顾延芬 《台湾海峡》1993,12(1):81-84

本文运用福建省沿海气象要素的异常变化,作台湾省的中、短期地震预报,取得了成功的效果。采用长乐历年各月14时最低气压的距平值,作台湾省未来4～7个月内出现强震的预报依据,并采用热异常进行短临跟踪。当秋冬季节连续4d 长乐、福州、台北的气温均比广州累计高出10℃时,预报未来1～5d 台湾省出现7级强震。又根据近百年来台湾发生的强震,统计其活动季节,得到近20年来7级地震发生的时间,绝大部分在9～12月。  相似文献   

A climatology of mesoscale model simulated low-level wind jets over Cook Inlet and Shelikof Strait, Alaska     

Haibo Liu  Peter Q. Olsson  Karl P. Volz  Han Yi 《Estuarine, Coastal and Shelf Science》2006,70(4):551

Weather in the North Gulf of Alaska is characterized by a high frequency of deep synoptic-scale low-pressure systems, especially during the cold season. The strong pressure gradients of these storms interact with the extremely rugged terrain of the coastal mountains to produce a variety of channeled flows. These surface wind regimes are not well documented in the scientific community, due to the paucity of observations. Modeling of these phenomena in regions of complex terrain is of great interest to those working with hydrodynamic, wave, and pollutant transport models in coastal and shelf areas. Such models, when coupled with ocean and coastal-ecology counterparts, give a broad view of the role surface winds play in shaping local coastal marine ecosystem in this region. This paper presents a climatology of simulated low-level wind jets over the domain of Cook Inlet and Shelikof Strait along Alaska's south-central coast. Daily simulations using the RAMS model were conducted in a 36-h forecast mode for the cold-season period 10/1/03 to 3/31/04. Systematic analysis of the resulting simulated low-level wind field makes it possible to characterize these jets and gap flows in spatial and temporal detail. The comparison between the RAMS winds and the Synthetic Aperture Radar (SAR)-derived winds when available verifies the existence of these wind jets and the capability of the model to simulate these cases. Clearly, the results of a study in this region depend on the fidelity of the model at these scales (O[5 km]). The SAR comparisons attempt to help establish this. From the 6 months of simulations over Cook Inlet and Shelikof Strait, the low-level wind jets are classified into 10 different regimes by location and orientation. These regimes are categorized into four more general groups: cross-channel westerly, easterly, and up and down Inlet flows. The nature of a particular regime is largely a function of pressure gradient orientation and local topography. Jets in the same group have a similar occurrence distribution with time. Some form of jet occurred in the study region almost daily each month of the period, with December 2003 having the highest frequency of wind jets.  相似文献   

确定任意磁性体磁化方向的样条函数法     

姜效典 《中国海洋大学学报(自然科学版)》1992,(2)

由磁异常Z_α和重力异常g,利用样条函数的微、积分性质,从泊松方程出发,直接解得磁性体的磁化方向。该方法适用于任意形状磁性体的磁异常。  相似文献   

台湾以东海区磁异常及磁条带研究     

梁瑞才  高爱国  郑彦鹏  刘焱光  裴彦良 《海洋科学进展》2003,21(3):291-297

资料显示,在整个台湾以东海区内磁异常几乎全为负磁异常,磁异常分块现象明显。通过对本海区的磁力资料进行分析和研究,表明本海区的地磁异常表现为明显的条带状异常特征。由于受板块差异性运动的影响,以加瓜海脊为界,东西两侧具有不同的磁条带方向,在加瓜海脊以东,磁条带为NW-SE向(120°),而在加瓜海脊以西则为近东西向(80°)。加瓜脊以西地区的扩张时间为45～38Ma,相当于19～16号磁条带;而加瓜脊以东地区的扩张时间为40～35Ma,相当于17～13号磁条带。加瓜脊以西的磁条带相对于以东的磁条带要老,由此推断出加瓜脊以西相对于东侧发生了北向位移。  相似文献   

青岛市大气污染时间序列分析预报方法研究   总被引：5，自引：0，他引：5  

黄磊  王赐震  王建华  于鹏 《中国海洋大学学报(自然科学版)》2001,31(1):14-20

根据青岛市大气污染监测资料 ,采用时间序列分析方法 ,建立多种预报模型 ,有原序列周期外延法、均生函数周期外延法、均生函数逐步回归法以及自回归预报法等 ,最后提出一种综合预报模型。连续预报试验表明 ,综合预报模型优于任何个别预报模型 ,有较好的预报能力。利用马尔可夫概型对污染状态 (轻、中、重 )进行了分级预报试验 ,也获得良好的效果。  相似文献   

A dipole mode at thermocline layer in the tropical Indian Ocean     

Tian Jiwei  Liu Huiqing  Qian Weihong 《海洋学报(英文版)》2003,22(1):15-24

Temperature data at different layers of the past 45 years were studied and we found adiploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian O-cean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.  相似文献