新疆西昆仑科库西里克铅锌矿床地质及元素地球化学特征   总被引：1，自引：0，他引：1  

董永观  郭坤一  廖圣兵  肖惠良  王涛 《地质学报》2006,80(11):1930-1938

新疆西昆仑地区科库西里克铅锌矿床赋存于中元古界长城系大理岩层间断裂带内.本文阐述了该矿床区域地质和地球化学背景,矿体特征及矿石成分,微量元素及稀土元素变化特点,并与区内密西西比型塔木—卡兰古铅锌矿床进行了比较.研究表明,科库西里克铅锌矿床矿体围岩—大理岩微量元素和稀土元素含量高于矿石,Rb、Th明显富集,Ce略富集,Ti亏损;矿石微量元素含量变化较大,Rb正异常明显,Ba、Nb、Zr、Ti负异常,既继承了围岩特征,又保留了成矿热液的成分特点.而塔木—卡兰古铅锌矿床的矿石与围岩的元素地球化学特征一致.据此认为科库西里克铅锌矿床成矿作用受中元古界长城系大理岩和断裂构造控制,成矿过程中有岩浆热液的加入.  相似文献   

舟山群岛外海域鱼类数量分布与环境因子的关系     

于南京  俞存根  许永久  陈立红  许恒涛  王慧君  张佩怡  刘坤 《海洋学报》2020,42(10):80-91

根据2018年4月（春季）和10月（秋季）在舟山群岛外海域进行的渔业资源调查资料,分析了鱼类的种类组成、数量分布和优势种,并用典范对应分析方法分析了其与水文环境之间的关系。结果表明,舟山群岛外海域鱼类有106种,隶属于12目47科80属,春、秋季鱼类质量密度分别为210.50 kg/km2和829.06 kg/km2,尾数密度分别为8.08×103 ind/km2和165.94×103 ind/km2。春季鱼类资源密度在调查海域的西北部较高,东部较低,而秋季鱼类资源密度在东部海域较高,西北部海域较低。两个季节的鱼类优势种更替明显,春季优势种为黄鮟鱇（Lophius litulon）、日本红娘鱼（Lepidotrigla japonica）、细条天竺鲷（Apogon lineatus）,秋季为细条天竺鲷、日本发光鲷（Acropom japonicum）。鱼类种数呈现显著的季节和空间变化,但是都以西部以及西北部靠近近岸岛屿的海域种类数较高,大部分鱼类栖息在50～80 m水深海域。典范对应分析结果表明,表层温度、底层温度、表层盐度是影响调查海域鱼类种类组成和数量分布的主要环境因子。  相似文献   

Numerical Simulation of Water Level Under Interaction Between Runoff and Estuarine Dynamics in Tidal Reach of the Yangtze River     

雷智鹢  张金善  孔俊 《中国海洋工程》2009,23(3):543-551

The Yangtze Estuary, the largest estuary in China, is under an obvious interaction between runoff and astronomical tide. The research on the interaction is very important for the exploitation and utilization of water resources in this area. A horizontal 2D hydrodynamic numerical model is established and verified in the present study with the modeling range from Datong to the Yangtze Estuary. Based on the comparison of high water levels under the interaction between different runoff and estuarine dynamics, s...  相似文献   

Mathematical Models for Combined Refraction-Diffraction of Waves on Non-Uniform Current and Depth   总被引：12，自引：2，他引：12  

Hong Guangwen Professor  Research Institute of Coastal  Ocean Engineering  Hohai University  Xikang Road  Nanjing 《中国海洋工程》1996,(4)

Two mathematical models for combined refraction-diffraction of regular and irregular waves on non-uniform current in water of slowly varying topography are presented in this paper. Model I is derived by wave theory and variational principle separately. It has two kinds of expressions including the dissipation term. Model n is based on the energy conservation equation with energy flux through the wave crest lines in orthogonal curvilinear coordinates and the wave kinematic conservation equation. The analysis and comparison and special cases of these two models are also given.  相似文献   

Organic Carbon Isotopic Evolution during the Ediacaran-Cambrian Transition Interval in Eastern Guizhou, South China： Paleoenvironmental and Stratigraphic Implications   总被引：5，自引：2，他引：3  

YANG Xinglian ZHU Maoyan GUO Qingjun ZHAO Yuanlong 《《地质学报》英文版》2007,81(2):194-203

Secular variations of carbon isotopic composition of organic carbon can be used in the study of global environmental variation, the carbon cycle, stratigraphic delimitation, and biological evolution, etc. Organic carbon isotopic analysis of the Nangao and Zhalagou sections in eastern Guizhou reveals a negative excursion near the Precambrian-Cambrian boundary that correlates with a distinct carbonate carbon isotopic negative excursion at this boundary globally. Our results also demonstrate that several alternating positive and negative shifts occur in the Meishucunian, and an obvious negative anomaly appears at the boundary between the Meishucunian and Qiongzhusian. The isotope values are stable in the middle and lower parts but became more positive in the upper part of the Qiongzhusian. Evolution of organic carbon isotopes from the two sections in the deepwater facies can be well correlated with that of the carbonate carbon isotopes from the section in the shallow water facies. Integrated with other stratigraphic tools, we can precisely establish a lower Cambrian stratigraphic framework from shallow shelf to deep basin of the Yangtze Platform.  相似文献   

Can Eddy Forcing be Responsible for the Spatial Structure of the Northern Hemisphere Annular Mode?     

ZHAO Nan  LI Yan  SHEN Xinyong 《Acta Meteorologica Sinica》2010,24(5):584-592

In order to study the origin of the spatial structure of the Northern Hemisphere Annular Mode (NAM),a linear stochastic model is constructed empirically from the output of a GCM run.Optimal stochastic forcing in terms of the maximum variance contribution,which may be potentially related to the maintenance of the NAM,is investigated.Theoretical analysis on the dominant non-modal response to the stochastic forcing shows that this dominance is jointly decided by the properties of forcing and the non-modal grow...  相似文献   

南北半球经向气压驻波与热带季风的相关特征     

朱乾根  徐祥德 《南京气象学院学报》1991,14(1):18-24

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北半球增暖对我国气侯的影响     

屠其璞 《南京气象学院学报》1991,(3)

本文在分析100多年来北半球平均气温长期变化基本特征的基础上,讨论了北半球气温变化对我国气候变化的影响。结果表明,我国大范围气温距平与北半球平均气温有显著的正相关,长江中下游和华北平原的温度距平值平均为北半球平均气温距平的1.4-1.6倍。还表明,我国降水距平分布与北半球气温变化也有一定的联系。在北半球平均气温偏高和偏低年份,欧亚地区500hPa环流特征的差异是显著的。这表明,我国大范围气候距平与北半球平均气温距平的统计相关是有一定的物理基础的。  相似文献   

统计模拟在经纬仪测风资料误差分析中的应用     

陈志鹏  张蕾 《南京气象学院学报》1991,14(3):340-345

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IAP GCM模式大气背景环流在厄尔尼诺年的异常     

王盘兴  刘家铭 《南京气象学院学报》1991,14(4):503-509

本文分析了中国科学院大气物理研究所大气环流模式(IAP GCM)模式大气5～9月平均环流(本文称为背景环流)。结果表明;厄尔尼诺年一系列重要系统(南方涛动、瓦克环流、哈德莱环流、西太平洋副热带高压和热带辐合带)及大范围降水均发生明显异常;北半球西太平洋热带、副热带是环流异常的主要区域。它们与观测资料的分析结果基本一致,从而论证了该模式在低纬环流研究中的应用前景。  相似文献