Ergebnisse und Aussichten der Gefügeforschung im pommerschen Diluvium

Richter, Konrad

doi:10.1007/bf01804834

Cited by 17 publications

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“…AIthough Sander's methods were initially used in the study of metamorphic tectonites, their application to the study of sedimentary fabrics was pioneered by Richter (1936), Sander (1 936) and the American sedimentologist and pioneer mathaematical geologist, William Christian Krumbein (1 902-79) (Krumbein, 1939(Krumbein, , 1940. Krumbein also used equal-area polar projections on the grounds that they supplied 'information which cannot be derived directly from the petrofabric diagram' and did much 'to supplement' their usage.…”

Section: W I Qiinrimentioning

confidence: 99%

History of the stereographic projection and its early use in geology

Howarth

1996

Terra Nova

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The origin of the polar and equatorial stereographic projections can be traced back to Hipparchos (d. 125 bc). The equatorial projection became an essential tool in astronomy and from the 2nd to mid‐17th Century it enabled the development of the astrolabe as a navigational tool and later became important in mapmaking. Examples of equatorial stereographic nets by the astronomer al‐Zarquǎlǎ (ad, 10701 and the cartographer Blaeu (1624) are illustrated. By the early 19th Century, mathematics was beginning to be applied outside the fields of astronomy, physics and mechanics. The stereographic net was first applied to mineralogy by Neumann (1823) and its use was subsequently popularized by Federov (1892), inventor of the universal microscope stage, and by the introduction of the Wulff net (1902). It also proved of considerable use in the correct interpretation by W.L. Bragg of Laue X‐ray diffraction patterns of crystals which led to the development of X‐ray crystallography. The Lambert (1772) equal‐area projection, developed for cartographic use and subsequently termed the Schmidt net by Sander in 1925, was essential to the development of petrofabric analysis in the late 1920s. The transition to macroscopic structural analysis, which largely took place over the period 1930–55 is briefly touched upon.

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Section: W I Qiinrimentioning

confidence: 99%

History of the stereographic projection and its early use in geology

Howarth

1996

Terra Nova

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“…Miller 1884; Richter 1936). Despite these differences, however, a relationship between the ice flow directions indicated by striations and those derived from subglacial till clast fabrics is commonly assumed.…”

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Comparative study of striations and basal till clast fabrics, Malpeque—Bedeque region, Prince Edward Island, Canada

Catto

1998

Boreas

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Comparative study of striations and basal till clast fabrics, Malpeque-Bedeque region, Prince Edward Island, Canada NORM R. CATTO BOREAS Catto, N. R. 1998 (December): Comparative study of striations and basal till clast fabrics, Malpeque-Bedeque region, Prince Edward Island, Canada. Boreas, Vol. 27, pp. 259-274. Oslo. ISSN 0300-9483. Coastal erosion has resulted in exposure of a succession of basal till deposits and striation localities along the Malpeque and Bedeque Bays, PEI, Canada, permitting repetitive determinations of clast fabrics and investigation of recently exhumed striations. Striations indicate initial eastward ice flow, followed by a second glacial event with flow towards the south and southwest from the Gulf of St. Lawrence. The degree of local inconsistency and the variations with striation assemblages indicate that the orientations of individual striations cannot be regarded as 'absolute' indicators of ice flow directions. Diamictons identified as basal tills using sedimentological criteria have clast fabrics typical of basal till deposition. Local deviations of fabric trend within individual outcrops are common. A comparative analysis of the data obtained from striation and clast fabric orientations indicates that the ice flow directions independently suggested by each are in general agreement. Differences are present between the orientations of striations and clast fabrics at individual sites.The orientations of the fabrics lie within 20" of the modal striation orientations in only 28'%, of the cases, and the median deviation between the suggested ice flow directions was 29". In 40% of the cases, the azimuth deviation between the two methods exceeded 40", and the maximum deviation recorded was 84". At many sites, the deviations are so severe as to potentially result in the misinterpretation of the modal ice flow direction, based on the use of either striation orientation or clast fabric in isolation. Variations in glacial flow can readily produce striations and clast fabrics which record different phases of glacial activity associated with the same glacial event at an individual site.

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Trümmersedimente, klastische Gesteine

Niggli¹,

Niggli

1952

Gesteine Und Minerallagerstätten

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Ergebnisse und Aussichten der Gefügeforschung im pommerschen Diluvium

Cited by 17 publications

References 2 publications

History of the stereographic projection and its early use in geology

History of the stereographic projection and its early use in geology

Comparative study of striations and basal till clast fabrics, Malpeque—Bedeque region, Prince Edward Island, Canada

Trümmersedimente, klastische Gesteine

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