Granulometrie und Sandkornmorphoskopie alpiner Glazialsedimente


Contact
bdiekmann [ at ] awi-bremerhaven.de

Abstract

Sediments from various subenvironments of alpine valley glaciers can be distinguished by their grain-size distributions. Glacio-aquatic deposits exhibit narrower grain-size spectra and better grain-size sorting than sediments of pure glacial origin. The various types of moraine sediments can be recognized by varying contents of fine-grained matrix (less than 0.063 mm in diameter). Glacially affected quartz grains show conchoidal, step- and block-fracture patterns of varying shapes and sizes, but it is difficult to discern whether these microtextures are of genomorphic or phenomorphic origin. Frequently a single grain exhibits sharply acute as well as notched and rounded edges, reflecting the uneven distribution of forces during subglacial transport. Likewise, feldspar grains show both abraded and rough (shatter-cleaved) surfaces.



Item Type
Article
Authors
Divisions
Programs
Peer revision
Not peer-reviewed
Publication Status
Published
Eprint ID
3676
Cite as
Diekmann, B. (1990): Granulometrie und Sandkornmorphoskopie alpiner Glazialsedimente , Zentralblatt für Geologie und Paläontologie Teil 1, 1989, Heft 9/10, pp. 1407-1421 .


Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item