ISSN:0021-1915    

DOI:10.1080/10256019308046108

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The paper presents a whole-year study (1990) of an unique area in S-E Poland with numerous small rivers and streams carrying clean waters. We report the results of δ18O of waters and δ34S of the sulphates sampled 4 times in 1990 from 20 rivers of the study area. The observations clearly show the impact of biological activity on the oxygen and sulphur isotopic compositions in sulphates. Attempts have been made to interpret the correlation between δ34S and δ18O in sulphates. The highest correlation coefficient has been noticed for samples collected in April, whereas the lowest in August. The conclusion of this study is that the river sulphates are predominantly produced outside the river environment. We have distinguished three major sources of sulphates: (1) ones produced in the aquifer from which waters are discharged, (2) those produced in soils and marshes of forest environment, and (3) ones on anthropogenic origin.

ISSN:0021-1915    

DOI:10.1080/10256019308046109

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

In this paper we consider deep waters from horizons located under the Baltic-Sea bottom. The samples were taken twice from wells bored in Hel peninsula. The δ18O and δD values of these waters show their glacial origin since they have significantly low values (δ18O from −14 to −11 whereas the modern groundwaters in Gdańsk area have −10%0). In contrast to surface waters the sulphates dissolved in these deep waters have rather high and uniform δ18O values which are correlated with δ18O of H2O but not correlated with δ34S. The isotope patterns may be explained assuming that the waters are very old, in which the slow process of oxygen isotope exchange at low temperatures, but extended in time, could enrich the sulphate in heavier oxygen isotopes.

ISSN:0021-1915    

DOI:10.1080/10256019308046110

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Carbon and oxygen isotope compositions have been determined for carbonate minerals from different types of carbonatites (large carbonatite bodies, veins, eruptive breccia), as well as from different temperature classes of carbonatites (according to Samoilov [1]). It could be shown, that only high temperature carbonatites exhibit small variations of δ18O and δ13C falling in the range of “high temperature mantle carbonates”, whereas low temperature calcites and dolomites show wide variations in δ18O. These changes in both isotope and mineral compositions of low temperature carbonatites are interpreted as a result of repeated interaction with fluids. The oxygen isotope ratios in most of the eruptive breccia have been changed by secondary processes. The primary deep-seated isotope record has been preserved only in samples, in which carbonate occurs as fine-grained calcite groundmass.

ISSN:0021-1915    

DOI:10.1080/10256019308046111

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Geochemical and mineralogical investigations of plutonic rocks from the Meiβen massif indicate different magmatic evolution trends of the Freital sequence as well as for the central part of the complex Constant ε-NdT-345values of −1.5 of the Freital sequence and major/trace element data point to a fractional crystallization process. Based on ε-Nd values,147Sm/144Nd ratios as well as on geochemical data affinities to alkali basalts cannot be excluded.

ISSN:0021-1915    

DOI:10.1080/10256019308046112

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

In isotope geochemistry, natural differences in isotope abundance ratios of heavy elements (e.g. Sr, Nd, Pb) allow the use of specific isotopic signatures as tracers for these and genetically related elements. Examples of such applications in the field of anthropogeochemistry will be presented for lead and strontium.

ISSN:0021-1915    

DOI:10.1080/10256019308046113

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

In the course of studies of the layered intrusion Kiwakka about 70 samples of rocks and minerals have been investigated. The oxydation reagent ClF3was used to extract oxygen from the samples. The obtained δ18O-values show a significant differentiation of the intrusion itself in dependence of its petrographic composition. The conclusion can be drawn that the intrusion has formed under conditions of a closed system and that the magmatic fluid does not contain meteoric water, possibly.

ISSN:0021-1915    

DOI:10.1080/10256019308046114

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

He and Ar isotope abundances in alkaline rocks of the Lovozero layered ore-bearing complex are used to discuss the origin of hydrogen-hydrocarbon gases (HHG).

ISSN:0021-1915    

DOI:10.1080/10256019308046115

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The use of gas-geochemical study results for decisions of various problems of mining and geological character was shown by example of the alkaline nepheline syenite massifs in the eastern part of Baltic Shield. Two principal morphologic types of gases (freely evolved and occiuded or microincluded) are known in the considered rocks. The gas composition is: hydrogen-hydrocarbons, mixed with He, N2, sometimes CO, and CO2. Discovering gas zoning, relative time of generation and space distribution regularities of gases concerning ore deposits assume the participation of reduced fluids and postmagmatic processes in the formation of certain ores, the origin of which was considered magmatic. In some cases gas-geochemical peculiarities of rock and minerals can be employed in the capacity of indicators of ore mineralization in search works. However studies of gases (compositions, distribution, release conditions and intensity) have most practical significance for guarantee of ore deposits gas-safe exploitation. It is suggested to use the detected relationships of gas-geochemical, gas-dynamic and tectonophysic parameters for the evaluation of rock stress level and forecasting of mining shocks.

ISSN:0021-1915    

DOI:10.1080/10256019308046116

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The paper deals with the correlation between the Rn-concentration in underground waters and the Ra-concentration in these waters, but also the correlation between Rn-concentration in these waters and Rn-concentrations of gases in rocks around these waters. Essential for the Rn-concentration is the Ra-concentration only in such water which has an extraordinarily high Ra-concentration.

ISSN:0021-1915    

DOI:10.1080/10256019308046117

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor