NDLI: Lithologie des cailloux de la baie de Montmagny, côte sud du Saint-Laurent, Québec

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Lithologie des cailloux de la baie de Montmagny, côte sud du Saint-Laurent, Québec

Content Provider	Semantic Scholar
Author	Dionne, J.
Copyright Year	2007
Abstract	A Montmagny, sur la rive sud de l'estuaire du Saint-Laurent, a environ 75 km en aval de Quebec, d'abondants cailloux de lithologies variees parsement la zone intertidale, malgre l'absence de depots grossiers en bordure du rivage actuel. Les cailloux reposent directement sur un substrat compose de sable fin, limon, vase et argile marine. Ce milieu, domine par la sedimentation fine, se revele donc assez original puisqu'il implique des agents de transport et de mise en place fort differents: d'un cote, vagues, courants et marees, de l'autre, les glaces flottantes. L'abondance des cailloux a permis de faire de nombreux comptages et de calculer les pourcentages de chacune des lithologies representees. Les 42 105 cailloux comptes comprennent 19,9% d'elements precambriens (gneiss, granite, anorthosite, etc.), 59,5 % de gres, 13,6 % des schistes. 6 % de calcaires et 1 % de conglomerats. Les cailloux proviennent de trois grandes unites geologiques: le Bouclier laurentidien (Precambrien) au nord, les formations cotieres appalachiennes (Cambro-Ordovicien) au sud et les formations sedimentaires des basses terres du Saint-Laurent (Ordovicien) au sud-ouest. Bien qu'une forte proportion des cailloux soit d'origine locale, une partie a subi des deplacements de l'ordre de 100 a 200 km. Les glaces flottantes constituent le principal agent de transport et de mise en place.
Starting Page	161
Ending Page	169
Page Count	9
File Format	PDF HTM / HTML
DOI	10.7202/032673ar
Volume Number	41
Alternate Webpage(s)	https://www.erudit.org/fr/revues/gpq/1987-v41-n1-gpq1925/032673ar.pdf
Alternate Webpage(s)	https://doi.org/10.7202/032673ar
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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