清镇陨石（EH3）硫镁矿微量元素化学特征   总被引：1，自引：0，他引：1  

陈永亨佩里卡  E 《矿物学报》1993,13(3):197-203

本文应用电子探针和中子活化分析方法详细研究了清镇陨石(EH 3)中硫镁矿的化学组成和微量元素分布、硫镁矿携带了部分HREE、高度富集钪等难熔亲石元素,论证了该矿物的高温成因,REE丰度可能与陨硫钙石互补。该矿物含有钠-硒组分,可能是顽火辉石陨石独有的组分。铬归一化的钠-钴(原子比)相关关系具有CI一致的趋势,表明其母体来自太阳组成的气体星云。  相似文献   

Magneto-telluric recordings from the Friuli seismic zone, northeast Italy     

M. Zadro  T. Ernst  J. Jankowski  C. P. Rozluski  R. Teisseyre 《Tectonophysics》1990,180(2-4):303-308

Magneto-telluric measurements were undertaken in the Friuli seismic area of north-east Italy. The purpose was to find possible correlations between magneto-telluric signals and seismic activity. Two stations were operational between July 1987 and June 1988. Apparent resistivity curves were found for September 1987 and January 1988 data, and a magneto-telluric inversion problem was solved. Artificial noise and natural disturbances of the electromagnetic field, especially those related to tectonic processes, are discussed.  相似文献   

Atlas “New German Federal States”     

Benedict Ernst  Friedlein Günter 《GeoJournal》1990,22(2):207-210

  相似文献   

A Geochemical and Isotopic Approach to Delineate Landfill Leachates in an RCRA Study     

Steven J. Fritz  Jeffrey D. Bryan  F. Edwin Harvey  Darrell I. Leap 《Ground water》1994,32(5):743-750

  相似文献   

Modelling of igneous fractionation and other processes using Pearce diagrams     

Richard E. Ernst  Anthony D. Fowler  Thomas H. Pearce 《Contributions to Mineralogy and Petrology》1988,100(1):12-18

Geochemical data can be quantitatively modelled by means of Pearce diagrams. These are graphs of A/Z vs B/Z where A, B and Z are compositional abundances (e.g. wt.% SiO₂, wt.% MgO, and ppm La) and Z has the additional property of having constant absolute abundance. In the terminology of igneous petrology, Z (the common denominator variable) could be an incompatible element. The numerators (A and B) may be complex algebraic combinations of elements, or even CIPW normative abundances. The utility of Pearce diagrams lies in the fact that slopes of data distributions equal the bulk AB ratio of minerals lost or gained from a suite of cogenetic rocks. There is no distortion because these plots correct for data closure. Terms of the form A_i·Z₀/Z_i (where Z₀ is the abundance in a reference sample) remove the scaling to A_i caused by the abundance of a particular choice of Z. Subtraction of these terms for different samples (e.g. A_i·(Z₀/Z_i)-A_j· (Z₀/Z_j)) quantifies mineral losses and gains. Mathematical analysis shows that limited compatibility of the denominator variable is permitted. A bulk partition value (D) of 0.1 introduces an error of only 10% in values of A_i***-Z₀/Z_i, and 10° in slope-angle on Pearce diagrams over a crystallization interval of 50%. For D0.01 the error is minimal for a crystallization interval over 90%.  相似文献   

Petrochemical Comparison of 3.5 Ga Old Mafic Amphibolite Inclusions from Eastern Hebei Province with Archean Mafic—ultramafic Supracrustals of Uncertain Antiquity,Southern Jilin Eastern Liaoning Prov     

W.G.Ernst 《中国地球化学学报》1989,8(2):97-111

New major element data for coexisting minerals and bulk-rock REE analyses,combined with previously obtained petrologic/geologic information,allow comparison of Archean mafic-ultramafic meta-igneous rocks from adjacent portions of northeastern Sino-Korean shield .Isotope data published by previous workers document an Early Archean age of formation for metabasaltic rocks now occurring as mafic amphibolite inclusions in tonalitic gneisses west of Bohai Bay(area).Mafic-ultramafic mineral assemblages developed in tonalitic gneisses west of Bohai Bay(areaA).Mafic-ultramafic mineral assemblages developed in amphibolite facies Archean supracrustals east of Bohai Bay(areaB)are chemically similar ,but pre-existing phase associations have been overprinted by the effects of several later metamorphic events.Non0peridotitic area B protoliths appear to be more magnesian ,averaging-12wt.%MgO(versus-7wt.%for area A),and are slightly less fractionated in REE concentrations relative to chondrites(La-Lu=30-8X versus 37-14X for area A),thus perhaps being more mantle-like than area A metabasaltic analogues.The basaltic-komatiitic series east of Bohai Bay probably represents the most ancient crust of that region,being invaded by Archean tonalities,which were subsequently converted to orthogneisses.These observations are compatible with the hypothesis that ,similar to area A metabasaltic rocks now found as amphibolitic inclusions in orthogneisses,are B mafic supracrustals were formed during Early of Middle Archean time ,prior to widespread isofacial amphibolite facies metamorphism(600-700℃,5-7kb,low αH2O).  相似文献   

Book reviews     

El-Sayed  El-Bushra  J. A. Hellen  Hong-key Yoon  A. Wallner  C. A. Halstead  Gisela Prasad  Ernst H. Doerpinghaus/Altea  Ulrik Lohm  Ernst H. Doerpringhaus  Helmut Vidal  John M. Reynolds  Matthias Kuhle 《GeoJournal》1989,18(4):461-466

  相似文献   

Observations on the algal genus Basicladia and the red-bellied turtle,Chrysemys rubriventris     

Carl H. Ernst  James N. Norris 《Estuaries and Coasts》1978,1(1):54-57

  相似文献   

Progressive simple shear deformation on the Laxford Shear Zone,Sutherland     

F. Bryan Davies 《Proceedings of the Geologists' Association. Geologists' Association》1978,89(3):177-196

  相似文献   

A note on the interpretation of acoustic sounder returns     

Bryan R. Kerman 《Boundary-Layer Meteorology》1976,10(3):303-310

A method is outlined for estimating statistical characteristics of turbulence in the atmospheric boundary layer using pairs of observables derived from scattered acoustic energy. The procedure involves determining, from the observable pair, a local stability parameter and deducing from related similarity functions certain turbulence statistics not measured directly. The results are limited to heights small compared to the Ekman-layer depth and to flows which are neither fully developed convectively nor have imbedded gravity waves.  相似文献