摘要:

The structural properties of synthetic silicates, primarily sheet silicates, crystallized within potash-bearing sesquioxide-silica-water systems, were studied by means of X-ray powder diffraction data. The prototype system of penological importance is the one with alumina as sesquioxide component. As regards this system the main attention was directed at the join pyrophyllite-muscovite. The fairly continuous increase of thebdimension with increasing potassium content recorded for phases along this join is indicative of the formation of solid solutions, the scheme of which is tentatively outlined. The polymorphism of muscovite is also touched upon.

ISSN:0016-786X    

DOI:10.1080/11035896609448343

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The compositions of ball clays and of Etruria marls have been determined on different occasions and the changes in chemical and mineralogical constitution have been examined. The effects of such changes on certain physical properties are discussed and it is noted that compositional variation may have less influence on some of these than the physical state of the clay. Other properties, notably the irreversible thermal expansion of the unfired clay, are more closely associated with composition.

ISSN:0016-786X    

DOI:10.1080/11035896609448344

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

For the last 15 years a metal-foil core borer has mostly been used in Sweden to take clay samples for geochronological datings based on varve measurements. The foil core borer seems to be the most suitable instrument in exacting investigations, when the sampling depth is great and the lower varves are silty and unstable.

ISSN:0016-786X    

DOI:10.1080/11035896609448345

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

A new find of mammoth, a molar (M3), was made in the summer of 1965 at Bäck in the Lake Siljan district. A pollen analysis of a small amount of clayey material from the cavity of the anterior part of the root indicates that the tooth was embedded more than 40000 years ago, very likely in early Riss/Würm Interglacial Time.

ISSN:0016-786X    

DOI:10.1080/11035896609448346

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Six Swedish finds of subfossil bison were pollen-analytically dated by Isberg (1949) as originating from pollen zones V–VI according to Jessen's zone system. Recent pollen analyses of fresh samples from the six skulls or horn-cores, besides from a seventh find, have shown that one animal originates from the transition between zones III–IV, 4 from zone IV, one presumably from zone IV or the very beginning of zone V, while one could not be dated.

ISSN:0016-786X    

DOI:10.1080/11035896609448347

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Leptite marker beds in quartz-banded iron ore, Gräsberg Mine, Central Sweden. The Gräsberg Mine is situated in the large Håksberg orefield. Two ore beds are exposed in the mine. They are torn apart by an intense shear-folding, with the ore bodies lying “en echelon”. Due to the occurrence of the two marker beds in the upper ore bed, it has been possible to determine the stratigraphic relations of the ore bodies. The marker beds also show that the ore beds are folded in a syncline with a fold axis dipping 45° to the NNE. This big fold is concealed by smaller, vertical shear-folds.

ISSN:0016-786X    

DOI:10.1080/11035896609448348

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The Orgueil meteorite consists of clay type minerals, carbonates, sulfates, iron oxides, elementary sulfur, and bituminous organic matter. It contains approximately 20 percent water, a part of which has deuterium/hydrogen ratios wholly different from terrestrial waters. The mineral texture of Orgueil resembles a pyroclastic sediment, leached by liquid water, yet the bulk chemical composition of this rock is very similar to the composition of the unfractionated primeval gas cloud. Hydrocarbons, fatty and aromatic acids, amino acids, porphyrins, purine and pyrimidine bases, and optically active lipids have been described from Orgueil as well as partially mineralized microstructures (organized elements). Most of these reports await independent confirmations. The origin of the Orgueil organic matter, the organized elements, and the petrogenesis is not yet known with a sufficient degree of certainty, but it is generally accepted that part of the complex organic matter is indigeneous. It has been suggested (Urey, 1962, 1965) that the Orgueil meteorite might be a lunar rock fragment representing the primeval lunar inorganic matrix which became contaminated with complex terrestrial organic matter during the violent processes that must have accompanied the capture (or escape) of the moon by the earth.

ISSN:0016-786X    

DOI:10.1080/11035896609448349

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Clinoptilolite is found in clays from southern Sweden and laumontite in clays from middle Sweden. The origin of these zeolites is briefly discussed.

ISSN:0016-786X    

DOI:10.1080/11035896609448350

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896609448351

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896609448352

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor