Upper Jurassic (Portlandian) sedimentology and palynofacies of Cabo Espichel, Portugal

Boland, David Craig (1986) Upper Jurassic (Portlandian) sedimentology and palynofacies of Cabo Espichel, Portugal. Masters thesis, Memorial University of Newfoundland.

[img] [English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version
Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.

Download (28Mb)
  • [img] [English] PDF - Accepted Version
    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
    (Original Version)

Abstract

Upper Jurassic (Portlandian) strata on the southeastern margin of the Lusitanian Basin at Praia-do Cavalo, near Cabo Espichel, Portugal contain mixed carbonate and clastic sediments. From this section ten facies were identified to produce a model of Upper Jurassic shelf development on a passive Atlantic-type margin. -- The model consists of carbonate shelf and clastic deltaio sediments linked by erosional and non-erosional contacts. The shallow marginal marine carbonate sequence consists of intertidal and low energy and high energy subtidal environments. The clastic sequence consists of interdistributary bay fill, crevasse splay, levee, channel, distributary mouth bar and delta front environments. Non-erosional boundaries occur where levees, crevasse splays and bay fill prograde over shallow subtidal nodular limestones and calcareous shales. Erosional boundaries occur where distributary channels soour through distributary mouth bars and prodelta strata to sharply - rest upon lithified massive subtidal limestones. -- The miospore assemblage consists of 49 terrestrial and 4 marine species in samples dominated by Corollina (Classopollis), Exesipollenites and Spherioollenites. Three palynofacies are identified; the C. simplex palynofacies is associated with siliciclastic lithologies; C. itunensis palynofacies is restricted to the carbonates and; the marine palynomorph facies is characteristic of some carbonates and delta front siliciclastics. -- The C. simplex - sediment association indicates that this pollen was derived from a plant which occupied an inland marsh or levee environment. The C. itunensis - sediment association implies a plant living on or near a marginal marine carbonate coast resembling a “mangrove” or saltmarsh environment.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/895
Item ID: 895
Additional Information: Bibliography: leaves 209-239
Department(s): Science, Faculty of > Earth Sciences
Date: 1986
Date Type: Submission
Geographic Location: Canada--Newfoundland and Labrador; Portugal
Library of Congress Subject Heading: Sediments (Geology)--Portugal; Palynology--Portugal; Geology, Stratigraphic--Jurassic; Geology--Portugal

Actions (login required)

View Item View Item

Downloads

Downloads per month over the past year

View more statistics