摘要:

Observations of the bolide connected with the doubtful meteoriteBleckenstadshow that, if a meteorite fell, it could not have happened in Bleckenstad but far to the south. The stone described as a limestone meteorite is hence a pseudometeorite.

ISSN:0016-786X    

DOI:10.1080/11035898209454536

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035898209454537

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A two year study of the metal content of birch leaves shows that most of the major elements increase in content during the growth season, whereas Cu and Ni decrease during its beginning. All trace elements have rather constant contents after the beginning of July. Ground water changes seem to explain the differences in major element contents between samples taken from 1977 and 1978. Physiological and leaf weight changes could explain the major variations during the growth season and the physiologically influenced increases are well eliminated by normalizations. Only the 1977 Mn increase is not eliminated, probably because of unusual ground water content. The best normalizations found are those with respect to Fe + Al + Zn, Ba + Sr and Al + Ti. Irregular variations in metal contents are hardly caused by occasional weather changes; probably they are caused by occasional ground water variations.

ISSN:0016-786X    

DOI:10.1080/11035898209454538

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035898209454539

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A type of crop marks observed in aerial photographs from the coastal plain of southwestern Sweden was discussed in some earlier papers and was found to display relict patterns of ice-wedge polygons. The polygons occur in different levels of the plain which was raised above the sea in Late-glacial time. In order to reach a more exact dating of the frost Assuring process which was the origin of the pattern, it is important to find the lowest situated polygons which are the youngest ones and, accordingly, those faintest developed. As the polygon net has no topographic representation in the surface, and the reproduction of the pattern is depending on both vegetation and meteorologic parameters, the search for low-lying polygon sites had to be extended over some years. The so far lowest found locality (9.04 m a.s.l.) is related to earlier observed low polygon sites and to dated levels of a shoreline diagram. A test pit was made for studying the material and its structural details corresponding to the faint lines. The ice-wedge cast (sand-filling in a clay matrix) that appeared in the section showed indications of erosion during, or after the fossilization. The original polygon surface was obviously influenced by the Postglacial transgression and the pattern is buried by a cover of sand — a fact which explains the very faint reproduction in the present-day ground surface. The morphological evolution of the polygon pattern from the formation in the Younger Dryas period to the erosion and burying during the Post-glacial transgression is outlined, and the possibilities of finding still lower-lying polygon sites are discussed.

ISSN:0016-786X    

DOI:10.1080/11035898209454540

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035898209454541

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This investigation was carried out in the Mörrumsån river valley, province of Blekinge, southeastern Sweden. To establish the boundary between washed and non-washed till ten profiles were selected, five on each side of the boundary between ‘coastal’ gneiss and granitoid rocks in the valley. The results show a difference in altitude of approximately five meters between the levels of the highest shoreline on each bedrock unit. This discrepancy could be explained by neotectonic movements.

ISSN:0016-786X    

DOI:10.1080/11035898209454542

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035898209454543

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The orientations of the apical end of orthoconic nautiloids that occur in abundance on the bedding planes of a sequence of wackestones in the Hemse Beds show two subequal opposing maxima, giving a bipolar orientation pattern. The petrography of the wackestones indicates an early lithification. It is concluded that the rocks represent littoral deposition in a lagoonal environment, and that the nautiloid shell accumulations were caused by stranding in connection with ephemeral incidents. The inferred bathymetry contradicts earlier opinions based exclusively on palaeontological criteria.

ISSN:0016-786X    

DOI:10.1080/11035898209454544

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Heavy metals accumulate in black shales. When the shales are metamorphosed the metals can migrate and form ore mineralisations. In the Soviet Union black shales are studied with the aim better to understand their ore generating possibilities.

ISSN:0016-786X    

DOI:10.1080/11035898209454545

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor