辽东裂谷硼地球化学块体内资源评价   总被引：1，自引：0，他引：1  

周永恒  张璟  徐山  李守义 《吉林大学学报(地球科学版)》2011,(Z1):98-105

利用地球化学块体理论研究辽东裂谷大约2万km21∶20万图幅化探水系沉积物硼元素数据,圈定硼地球化学省3处,地球化学异常4处。对研究区内硼地球化学块体特征及硼矿产资源特征进行了系统研究:确定5级地球化学子块体作为评价远景区;并提出远景区的含矿性与块体的面积、单位体积硼供应量、异常强度及块体套合层次密切相关,结合地球化学块体谱系树对远景区进行筛选,从物质来源方向确定找矿远景区;以发育里尔峪组、有利的褶皱构造及古元古代条痕状花岗岩3个条件作为含矿远景区的控制因素,从对成矿有利的富集条件方面确定区域找矿方向。共划分9个硼矿产成矿远景区,其中具有成矿远景的Ⅰ级远景区2个,分别为Ⅲ111-1和Ⅲ111-2。  相似文献   

Research on soil salt transfer under freeze-thawing condition     

LIU Lei  LI Xin  WEN Hao . College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2011,(2)

Soil salt transformation plays an important role in the freeze-thawing process,which is also one of basic problems of cryopedology. The very special law is made up of the two time salt-moisture transfer under freeze-thawing condition. Based on the latest research at home and abroad,through the investigation of soil moisture-salt change in the freeze-thawing process,the conclusion is made that the soil water potential gradient is the main driving force of soil salt movement and the factors are of quantities....  相似文献   

On paleoecology of carnivorous dinosaurs(Tyrannosauridae,Dromaeosauridae) from Late Cretaceous fossil deposits of Amur region,Russian Far East     

Ivan U.Bolotsky 《东北亚地学研究》2011,(1)

Present article is on Russian Far East carnivorous dinosaur paleoecology.Described summary is based on detailed study and comparison of isolated shed teeth morphology.  相似文献   

Zircon U–Pb Age and Deformation Characteristics of the Jiama Porphyry Copper Deposit,Tibet: Implications for Relationships between Mineralization,Structure and Alteration     

Jilin Duan  Juxing Tang  Russell Mason  Wenbao Zheng  Lijuan Ying 《Resource Geology》2014,64(4):316-331

The Jiama copper deposit is one of the largest deposits recently found in Tibet and is composed of three types of mineralization including skarn, hornfels and porphyry. To investigate the relationship between mineralization, structure and alteration, we report new zircon U–Pb age and present field observations on the deformation characteritics associated with the copper mineralization in Jiama. Two main periods of deformation were identified, represented by D₁ and D₂ in Jiama. The first deformation (D₁) occurred around 50 Ma, whereas the second deformation (D₂) that was closely related to mineralization occurred later. Previous zircon U–Pb and molybnite Re–Os dating results indicate that the mineralizatoin occurred at ～15 Ma and thus the D₁ regional deformation significantly occurred before the mineralization time, although the D₁ deformation probably provided important space for the development of significant copper deposition. Our new mapping and observations on the D₂ deformation demonstrate that the mineralization was closely coeval with or slightly later than the time of D₂ deformation. The new U–Pb zircon age further indicates that the aplite formed in ～17.0 Ma and thus the D₂ deformation happened later than this time because the D₂ deformation cut across the aplite, which is proposed to be the key control for copper mineralization. Altered laminated hornfels including three types of alteration (A‐, K‐ and S‐type) were found spatially associated with the D₂ deformation. The type‐A is mainly silicification, with fine sericite or chlorite, as well as abundant disseminated sulphides on fracture surfaces; the type‐S is mainly fine‐grained silicification with patches of chlorite, epidote and common sulphides; the type‐K (potassic alteration) appears to be fine‐grained biotite. Such types of alteration indicate the presence of skarns at depth where ore shoots are located. Taken together, the multiple structural‐magmatic‐mineralization events contributed to the formation of the supergiant Jiama porphyry copper deposit in Tibet. The results have general implication for regional exploration.  相似文献   

长江中下游成矿带岩石圈结构与成矿动力学模型——深部探测(SinoProbe)综述   总被引：23，自引：10，他引：13  

吕庆田  董树文  史大年  汤井田  江国明  张永谦  徐涛  SinoProbe--CJ项目组 《岩石学报》2014,30(4):889-906

岩石圈结构和深部过程对理解成矿带和大型矿集区的形成十分重要。岩石圈尺度的地球动力学过程将在地壳中留下各种结构的或物质的"痕迹",这些"痕迹"可以通过地球物理的手段去探测。为深入理解长江中下游成矿带形成的深部动力学过程,作者在国家深部探测专项(SinoProbe)和国家自然科学基金重点项目支持下,在长江中下游成矿带开展了综合地球物理探测。方法包括宽频地震、深地震反射、广角反射/折射和大地电磁测深。数据处理和反演结果取得一系列新发现:(1)成矿带上地幔顶部存在低速体,在中心深度300km处有一向SW倾斜的高速体;(2)S波接收函数证实成矿带岩石圈较薄,只有50~70km;横波分裂结果显示,成矿带上地幔各向异性方向和强度与邻区有较大区别,显示平行成矿带(NE-SW向)的上地幔变形和流动;(3)深反射地震揭示成矿带上地壳曾发生强烈挤压变形,以紧闭褶皱、逆冲和推覆为特征;在宁芜火山岩盆地、长江断裂带和郯庐断裂之下出现"鳄鱼嘴"构造,指示上下地壳在挤压变形过程中解耦;深反射地震证实发生过陆内俯冲和叠瓦,并认为是岩石圈增厚和拆沉的主导机制;(4)广角反射和大地电磁反演给出了跨成矿带地壳剖面的速度和电性结构,速度和电阻率分布总体上与构造单元相吻合。本文分析和解释了这些发现的地质意义,并结合近年在长江中下游地区的地球化学研究进展,提出了成矿带地球动力学模型。该模型认为:中、晚侏罗世陆内俯冲、岩石圈拆沉、幔源岩浆底侵和MASH过程造就了长江中下游世界级成矿带的形成。  相似文献   

Remote sensing needs and capabilities in West Africa     

EdwardM.Osei Jr. 《东北亚地学研究》2004,7(1):97-104

The greatest advantage of remote sensing over conventional measurements lies in the opportunity to carry out detailed spatio-temporal analysis of land and ocean features on a very frequent basis. This paper analyses the contribution of satellite imagery to atmospheric, geophysical and ocean studies and management in West Africa since the early 1980s.The detailed application of data from optical sensors (e.g. Meteosat,NOAA/AVHRR, SPOT, Landsat TM, etc.)for weather prediction,hydrogeological, landuse/cover and cartographic studies has been acknowledged. However, the use of microwave (e.g. SAR) and optical data for ocean monitoring and studies in the sub-region is still very limited. Even though sufficient remote sensing expertise and infrastructure is perceived in the region, no clearly defined networking or database exists.  相似文献   

Geo-hazards risk zonation and warning system based on GIS in Anshan City of Liaoning     

Zhishuang YANG Mao PAN Xiaopeng WANG 《东北亚地学研究》2006,9(2):207-212

Debris flow and Karst collapse are the main parts of geological disasters in Anshan,which have affected on the construction and development of the social economy of Anshan.In order to enhance the studies of rules of disaster and give scientific estimation and alarm ahead of schedule warning,we established the warning system of Anshan and investigated the corresponding software,which are based on the deep discussions about the crisis estimation and methods of prediction of disasters.In this paper,the foundation of model used in estimating the alarm ahead of schedule for disaster and the methods of appraisal for the alarm ahead of schedule are discussed.This system for warning and evaluating is the combination of the models of warning and GIS flat roof,with so many virtues,such as complete functions,convenience,applicability,which has considered the output of data,analyses of space,chooses of model,output of production,report of information for warning and the statements and help of system.  相似文献   

The Effect of Flow on Pollution and Remediation in Groundwater     

Moiwo J.Paul 《东北亚地学研究》2003,(2)

1IntroductionFlow is the key mechanism by which pollutants are transmitted from one point to another in hydro-geologic systems. Groundwater flow is not indepen-dent of the geological formation within which it occurs. Hydraulic conductivity which is a measure of groundwater flow is strongly related with the am-bient geologic properties such as texture,porosity and topography. These properties do not only con-trol the rate of groundwater flow but also limit the occurrence,hence the dispersion of…  相似文献   

An Alternative Index for the Onset of the Summer Monsoon over the South China Sea     

SUNJilin WANGDongxiao 《中国海洋大学学报(英文版)》2004,3(1):17-22

1　Introduction　TheindicesfortheAsianmonsoonhavebeenstud iedinmanyworks .Recently ,thechoiceofpropermonsoonindiceshasreceivedexceptionalattentionandraisedcontroversy (WebsterandYang ,1 992 ;Goswa mietal.,1 999;Goswami,2 0 0 0 ;Wang ,2 0 0 0 ) .Us ingzona…  相似文献   

TOPO-EUROPE: The geoscience of coupled deep Earth-surface processes   总被引：2，自引：0，他引：2  

S.A.P.L. Cloetingh  P.A. Ziegler  P.J.F. Bogaard  P.A.M. Andriessen  I.M. Artemieva  G. Bada  R.T. van Balen  F. Beekman  Z. Ben-Avraham  J.-P. Brun  H.P. Bunge  E.B. Burov  R. Carbonell  C. Facenna  A. Friedrich  J. Gallart  A.G. Green  O. Heidbach  A.G. Jones  L. Matenco  J. Mosar  O. Oncken  C. Pascal  G. Peters  S. Sliaupa  A. Soesoo  W. Spakman  R.A. Stephenson  H. Thybo  T. Torsvik  G. de Vicente  F. Wenzel  M.J.R. Wortel  TOPO-EUROPE Working Group 《Global and Planetary Change》2007,58(1-4):1

TOPO-EUROPE addresses the 4-D topographic evolution of the orogens and intra-plate regions of Europe through a multidisciplinary approach linking geology, geophysics, geodesy and geotechnology. TOPO-EUROPE integrates monitoring, imaging, reconstruction and modelling of the interplay between processes controlling continental topography and related natural hazards. Until now, research on neotectonics and related topography development of orogens and intra-plate regions has received little attention. TOPO-EUROPE initiates a number of novel studies on the quantification of rates of vertical motions, related tectonically controlled river evolution and land subsidence in carefully selected natural laboratories in Europe. From orogen through platform to continental margin, these natural laboratories include the Alps/Carpathians–Pannonian Basin System, the West and Central European Platform, the Apennines–Aegean–Anatolian region, the Iberian Peninsula, the Scandinavian Continental Margin, the East-European Platform, and the Caucasus–Levant area. TOPO-EUROPE integrates European research facilities and know-how essential to advance the understanding of the role of topography in Environmental Earth System Dynamics. The principal objective of the network is twofold. Namely, to integrate national research programs into a common European network and, furthermore, to integrate activities among TOPO-EUROPE institutes and participants. Key objectives are to provide an interdisciplinary forum to share knowledge and information in the field of the neotectonic and topographic evolution of Europe, to promote and encourage multidisciplinary research on a truly European scale, to increase mobility of scientists and to train young scientists. This paper provides an overview of the state-of-the-art of continental topography research, and of the challenges to TOPO-EUROPE researchers in the targeted natural laboratories.  相似文献