构造物理化学成矿理论问题探讨   总被引：3，自引：0，他引：3  

吕古贤  邓军  倪师军  李晓波 《大地构造与成矿学》2003,27(3):250-263

构造物理化学成矿研究涉及以下新的认识:构造体制下矿源岩系演化序列,构造动力热液淬取成矿机制,构造附加动力驱动热液成矿机制,构造应力场转化成矿机制,成矿流体水-岩反应的浓缩成矿机制以及构造物理化学场结构与界面成矿特点。  相似文献   

Fluid Evolution during HP and UHP Metamorphism in Dabie Shan, China: Constraints from Mineral Chemistry, Fluid Inclusions and Stable Isotopes   总被引：23，自引：1，他引：23  

XIAO  YILIN; HOEFS  JOCHEN; VAN DEN KERKHOF  ALFONS M.; SIMON  KLAUS; FIEBIG  JENS; ZHENG  YONG-FEI 《Journal of Petrology》2002,43(8):1505-1527

The Dabie Shan ultrahigh-pressure (UHP) metamorphic terraneis located in the eastern part of the east–west-strikingQinling–Dabie orogenic belt in China. A major mylonitizedcontact zone of 200–300 m width divides Dabie Shan intothe South Dabie Terrane (SDT) and the North Dabie Complex (NDC).Combined investigation of major and trace element geochemistry,fluid inclusions, and oxygen and hydrogen isotopes constrainsthe fluid history during the metamorphic evolution of the twometamorphic belts, which differ in their fluid and metamorphicevolution. Fluid inclusions in rocks from the SDT are mainlyaqueous with varying salinities, whereas those from the NDCare dominated by CO₂. Low  相似文献   

Emplacement of Deep Upper-Mantle Rocks into Cratonic Lithosphere by Convection and Diapiric Upwelling     

DRURY  M. R.; VAN ROERMUND  H. L. M.; CARSWELL  D. A.; DE SMET  J. H.; VAN DEN BERG  A. P.; VLAAR  N. J. 《Journal of Petrology》2001,42(1):131-140

Rocks containing breakdown products of majoritic garnet, derivedfrom the deep upper mantle, occur in kimberlite xenoliths andin orogenic peridotites from Otrøy in Norway. The Otrøyperidotites are banded harzburgites and dunites with similarcompositions to mantle xenoliths from Precambrian cratons andPhanerozoic supra-subduction-zone peridotites. Pressure–temperature(P–T) paths deduced for the Otrøy peridotites andkimberlite xenoliths from South Africa are consistent with emplacementof deep mantle peridotites into cratonic lithosphere by asthenospherediapirism. Numerical thermo-convection models provide insightinto the possible P–T histories of deep upper-mantle rocks.In the models, material from the base of the convecting systemis transported to depths of 60–100 km by convection andsmall (50–100 km) diapirs. Diapir intrusion induces small-scaleconvection in the low-viscosity deeper part of the thermochemicallydefined lithosphere. Small-scale convection in the craton rootcan produce complex P–T paths, complex recurrent meltinghistories and complex compositional structure in the craton.P–T paths derived from the numerical models for asthenospherediapirism in a hot upper mantle are consistent with the sequenceof sub-solidus P–T conditions deduced for the cratonicperidotites. KEY WORDS: asthenosphere diapirs; cratonic lithosphere; deep upper mantle; majoritic garnet  相似文献   

Searching for analogues, how long must we wait?   总被引：2，自引：0，他引：2  

H. M. VAN DEN DOOL 《地球，A辑:动力气象学与海洋学》1994,46(3):314-324

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攀西地区钾质煌斑岩岩石地球化学及源区构造环境分析          下载免费PDF全文

李再会  邓江红  肖渊甫  高媛 《地质找矿论丛》2005,20(2):80-86,136

分布于攀西及邻近地区的煌斑岩主要为云辉正煌岩-黑云正煌岩、白榴橄榄云辉岩、透辉云煌岩,常量元素特征表明岩石属于碱性系列、钾质钙碱性煌斑岩;过渡元素分配模式为幔源岩石的"W"型、不相容元素分配模式为大离子亲石元素和高场强元素富集的"驼峰"型、稀土元素分配模式为"右倾"的轻稀土富集型,表明该区煌斑岩为交代富集地幔部分熔融的产物.Ta-Nb-Ti负异常分配模式说明源区煌斑岩具有的交代富集地幔可能和板块俯冲有关.源区大地构造环境为活动大陆边缘的陆缘岛弧或陆缘火山弧区.  相似文献   

中华山岩体的谱系单位划分及基本特征     

邓瑞林  曹解华 《湖南地质》2000,19(4):225-228

中华山岩体形成于中三叠世,可划分出大段、沙田、竹坡、光石岩、光坡脚等5个单元。岩性均国灶云母二长花岗岩,但岩石结构、矿物成分、岩石化学成分、微量元素和稀土元素地球化学有明显差异和演化趋势,为一同源岩浆序列,经区域对比对立中华山超单元;花岗岩属壳源物质熔融型;岩体兼具主动和被动两种就位方式。  相似文献   

Oxygen isotope variability in snow from western Dronning Maud Land, Antarctica and its relation to temperature   总被引：1，自引：0，他引：1  

M. M. HELSEN  R. S. W. VAN DE WAL  M. R. VAN DEN BROEKE  D. VAN AS  H. A. J. MEIJER  C. H. REIJMER 《Tellus. Series B, Chemical and physical meteorology》2005,57(5):423-435

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Bedform migration and bed-load transport in some rivers and tidal environments     

JAN H. VAN DEN  BERG 《Sedimentology》1987,34(4):681-698

Reliable field data obtained by directly measuring bed-load transport of fine- to coarse-grained bed material are extremely scarce, mainly because of the difficulty of sampling accurately. Therefore, the verification of bed-load transport formulae is largely based on flume experiments, which refer to unrealistic shallow-water conditions. In this study, some bed-load transport formulae were tested against data from natural environments. As an alternative to ascertaining the bed-load transport rate by sampling the bed-load, the transport rate was deduced from data on bedform height and bedform celerity. For this purpose, 43 sets of data from rivers, representing a wide range of bed material, bedform dimensions and hydraulic conditions were collected as were some sets of data from tidal settings. Two formulae were used for the prediction of the bed-load transport: the formula of Van Rijn (1981) and the Kalinske (1947) formula as approximated by Elzerman & Frijlink (1951) (and, in the present study, slightly modified for application to tidal waters). Both the bed-load function of Van Rijn and the modified formula of Kalinske-Frijlink require data which are easily obtained and that can be measured accurately. At those stages of the flow when bed-load transport was high the Van Rijn function tended to overestimate that transport. For flow stages when bed-load transport was low the opposite was true. The modified Kalinske-Frijlink function gave consistently good results: 86% of the transport rates predicted using the river data were within 0·5–2·0 times the values actually measured.  相似文献