ISSN:0016-786X    

DOI:10.1080/11035896409455484

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

A relationship is indicated between gradients and ages of Late Quaternary shorelines of the Vättern basin in south central Sweden, based on the presumption that the change of the gradients of raised shorelines caused by unequal land uplift can be expressed by an exponential function of time. The numerical calculations are mainly based on formerly published data which are critically examined. The author finds that the proposed function well fits the gradients of shorelines developed in the period about 8000 B.C. to present time. A detailed summary and figure texts in English are added.

ISSN:0016-786X    

DOI:10.1080/11035896409455485

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Deposits of limestone on the lee-sides of glaciated rocks have earlier been described from Norway and Sweden (Höeg 1929, 1931 a, 1931 b, 1932, 1934, Westergård 1934, Bohlin 1943, and Kers 1961). In 1962 and 1963 similar limestone were observed in the vicinity of Gothenburg, in front of the Austrian glacier Pasterzenkees, and at Nigardsbreen, Norway. The crusts consist of microcrystalline calcite with varying contents of other mineral grains. The limestone is laminated. Plates with a thickness of 1 cm are common but there are also ridges, furrows, and nodules. A prominent lee-side is covered with coarse, dark calcite in semispherical bodies. The contents of calcite range from 30 to 75 percent by weight. The origin is shown to be subglacial. According to the formation through precipitation, there must, at least occasionally, have been some water both beneath the inland ice and the glaciers. The new localities suggest that subglacially formed limestone can be expected where unweathered, glaciated rocks are exposed.

ISSN:0016-786X    

DOI:10.1080/11035896409455486

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

A quartz-granite conglomerate found in the Ammarnäs Complex, Västerbotten, is described. The conglomerate is considered to be intraformational and may represent an original river bed.

ISSN:0016-786X    

DOI:10.1080/11035896409455487

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The tin mineralization at Rondonia, W. Brazil, is characterized by the association cassiterite and topaz. Both minerals occur as replacements in Precambrian to Early Paleozoic granites. The tin mineralization of the Eastern Cordilleras of Bolivia, on the other hand, has cassiterite and tourmaline as characteristic mineral association, and is related to the occurence of large granitic batholiths. The origin of the two tin mineralizations is discussed.

ISSN:0016-786X    

DOI:10.1080/11035896409455488

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The chemical characters of the lava members intermediate between mugearite and trachyte, trachybasalt and trachyte, in the oceanic basalt-trachyte association are reassessed in the light of researches recently reported (Chayes 1963). The several types of assemblages that fall within the limits of minimal frequency are recognized, and two assigned specific rank, the one more sodic— benmorite, the other more potassic —tristanite. Feldspathoidal variants may be associated with these near saturated type assemblages.

ISSN:0016-786X    

DOI:10.1080/11035896409455489

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The large amount of observations made by the geological mapping in the Skellefte district during several decades must be collected in an index-system of exposures in order to make it possibly to deal with the data systematically. The worked up system and its possibilities are described in the present paper.

ISSN:0016-786X    

DOI:10.1080/11035896409455490

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896409455491

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The nomogram described here facilitates an exact representation of rock boundaries in vertical sections based on observations of lateral dips. The nomogram is used in the iron mines of Malmberget. It is printed on transparent material and is obtainable from AB Ingenjörsutensilier, Kuńgsholmsstrand 125, Stockholm K.

ISSN:0016-786X    

DOI:10.1080/11035896409455492

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

During Early Boreal Time, corresponding to Zone V in the Dano-Swedish zonal system, woodland strongly dominated by hazel,Corylus avellana, occupied considerable parts of southern Sweden. The character of this woodland has been repeatedly discussed in North European literature on Quaternary vegetational history. In recent time a coppice-wood of “pure” or strongly dominating hazel occupies considerable surfaces of the central part of the Isle of Öland, and recently comparisons have been made between the Boreal hazel-woods and this type of vegetation, calledhässle. In literature published hitherto, thehässlevegetation has been supposed to be natural. However, even if there are obvious pedological and climatological predispositions for the occurrence of spontaneous hazel-woods on Öland, there exists documentation showing that important parts of the typicalhässlehave been intensively treated by man, even in very recent time, for the purpose of nut harvest.

ISSN:0016-786X    

DOI:10.1080/11035896409455493

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor