摘要:

The sediment distribution in Lake Vättern, which is situated on the southern border of the central Swedish lowlands, is illustrated by a map, in which five main types of sediments are distinguished. Large areas are covered by glaciofluvial sediments with a thin veneer of postglacial silt and sand. Silty mud and gyttja are only found in the deepest parts of the lake, which constitute about 9% of its area. The physical and chemical characteristics of these sediments are discussed on the basis of analyses of six cores from the southern part of the lake. Three of the cores have been palynologically analysed. The dating of one of the cores indicates an average rate of deposition of about 2.5 mm/year for the last 950 years.

ISSN:0016-786X    

DOI:10.1080/11035897209453684

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Authigenic sediments, particularly the oxidized, iron-rich, volcanic sediments from the Pacific Ocean, have interstitial waters with a pH close to 7.4, whereas in less oxidized hemipelagic sediments they show a large scatter in pH. In addition to reactions between silicates and sea water, the pH of interstitial and deep ocean waters is also controlled by the production of ferric hydroxides and the inorganic precipitation of carbonates during deep-sea volcanism.

ISSN:0016-786X    

DOI:10.1080/11035897209453685

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A reconnoitring profile from the ancient lagoon of Barsebäckmossen is described. The ingression of the sea probably occurred in connection with a transgression around the boundary between the Early and Late Atlantic periods. In the profile, a regression and a subsequent transgression are indicated during the earlier part of the Early Sub-Boreal period. In the central part of the ancient lagoon, another transgression during the later part of the Early Sub-Boreal period can be directly observed in the stratigraphy. The transgressions in Barsebäcksmossen agree well with the transgression scheme in Blekinge presented by Berglund (1964, 1971).

ISSN:0016-786X    

DOI:10.1080/11035897209453686

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The destabilization of the annite component in biotite, due to the presence of sulfur, has been studied by means of hydrothermal synthesis experiments in the temperature interval 485–575°C. Equilibrium relations between the composition of co-existing pyrrhotite and biotite in a system also containing magnetite and sanidine as solid phases are demonstrated. The composition of the vapor phase and the enthalpies of various reactions have also been calculated.

ISSN:0016-786X    

DOI:10.1080/11035897209453687

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Loose boulders of Cretaceous flint have been collected in Halland. The authoress has tried to divide the flint nodules into different morphological types. Two nodules have been selected for microfossil investigation.

ISSN:0016-786X    

DOI:10.1080/11035897209453688

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Two flint nodules have been investigated by palynological analysis. Both nodules were found in the province of Halland, south-western Sweden, viz. at Lilla Stensjö and Tönnersa. Terrestrial and marine plant microfossils indicate an upper Cretaceous age. It is suggested that the material from Lilla Stensjö is of Senonian age, whereas the nodule from Tönnersa is of Senonian or Danian age. The results presented are preliminary ones.

ISSN:0016-786X    

DOI:10.1080/11035897209453689

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Magnetite crystals of cubic habit have been found in a brucite—calcite vein from Långban, Sweden. The crystals were probably formed from low-temperature alkaline solutions. The hypothesis that magnetite crystals of cubic habit are dissolution products therefore needs revision.

ISSN:0016-786X    

DOI:10.1080/11035897209453690

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Paleocene bryozoans from drift boulders collected in the vicinity of the town of Ystad, Skåne, Sweden, are described. Two common species are identified, viz.Coscinopleura angusta Berthelsen and Pavobeisselina oblita (Kade).

ISSN:0016-786X    

DOI:10.1080/11035897209453691

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A new locality in the Lower Ordovician limestone sequence is reported from Ljungsbro in the county of Östergötland, southern Sweden. An account of the Quaternary deposits and a brief description of the underlying Lower Ordovician limestone are given. A rich and well-preserved macro- and semi-macrofossil fauna is listed and an exquisite phytoplankton flora has been examined.

ISSN:0016-786X    

DOI:10.1080/11035897209453692

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Till wedges are reported from a gravel pit in southern Sweden. They have previously only been described from North America Till wedges are intrusions into Underlying stratified deposits, formed by cracking and filling (in frozen ground) and squeezing in (in unfrozen ground). Their orientation is an important and reliable indicator of the direction of glacial movement. Till wedges (in Swedishmoränkilar) therefore provide a new tool for the establishment of the directions of ice flows. The till wedges here described indicate that the first Late Weichselian ice flow over southwesternmost Sweden came from the northwest.

ISSN:0016-786X    

DOI:10.1080/11035897209453693

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor