Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
THE STRUCTURAL GEOMORPHOLOGY OF THE ISLE OF PORTLAND, SOUTHERN ENGLAND
Autore:
BRUNSDEN D; COOMBE K; GOUDIE AS; PARKER AG;
Indirizzi:
UNIV LONDON KINGS COLL,DEPT GEOG LONDON WC2R 2LS ENGLAND
Titolo Testata:
Proceedings of the Geologists' Association
, volume: 107, anno: 1996,
parte:, 3
pagine: 209 - 230
SICI:
0016-7878(1996)107:<209:TSGOTI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
78
Recensione:
Indirizzi per estratti:
Citazione:
D. Brunsden et al., "THE STRUCTURAL GEOMORPHOLOGY OF THE ISLE OF PORTLAND, SOUTHERN ENGLAND", Proceedings of the Geologists' Association, 107, 1996, pp. 209-230

Abstract

The Isle of Portland, southern England, is composed of gently folded Upper Jurassic Beds ranging from the Kimmeridge Clay through the Portland Group to the Lower Purbeck Group which are gently folded to form part of the northern end of the Shambles Syncline. The essential arrangement of the beds is for hard, jointed well-bedded and permeable Purbeck and Portland limestones to overlie the Kimmeridge Clay members. Thejointing along NW-SE, NE-SW, N-S and E-W master and conjugate sets closely parallels the axis of the syncline and the NNE-SSW fault patternof the Purbeck Anticline and is a major regional landform control at all scales from the occurrence and form of individual rock falls to the shape of the island itself. Portland has a large number of landslips, which have been mapped from colour air photography. Their spatial pattern is spectacularly related to the geological conditions of the island and varies in size and type in a systematic manner as the thickness of clay and the orientation of the dip changes with respect to the coastline orientation. The slips, which occur predominantly in the winter months after heavy rainfall, are of frequent occurrence and pose major hazards to engineering structures. The landslide pattern and the overall morphology of the island is used to suggest a tentative model of landscape evolution which emphasizes the process of lateral spreading, loading, clay extrusion and erosional unloading.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/10/20 alle ore 19:33:10