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Stratigraphic framework of the geometry of the basal decollement of the Appalachian-Ouachita fold-thrust belt (1988)

Thomas, William A.

Springer

International journal of earth sciences 77 (1988), S. 183-190

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ISSN: 1437-3262

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Description / Table of Contents: Abstract The geometry of the basal decollement of the Appalachian-Ouachita fold-thrust belt is related to lateral and vertical variations in stratigraphic facies. Successive lithotectonic units reflecting evolution of the tectonic framework include pre-Appalachian crystalline basement, rift-fill sedimentary and volcanic rocks, passive-margin shelf and off-shelf facies, and synorogenic clastic wedges. Five distinct configurations of the basal decollement are systematically distributed with respect to pre-thrust tectonic elements and sedimentary facies. The relationship between sedimentary facies distribution and decollement geometry is useful in describing and predicting along-strike and across-strike variations in decollement level. The geometry of the basal decollement reflects the shapes of promontories and embayments along the rifted continental margin.

Abstract: Résumé Le décollement qui se trouve à la base de la ceinture plissée et charriée Appalachian-Ouachita présente une géométrie en relation avec les variations verticales et latérales du faciés stratigraphique. L'évolution du cadre tectonique se reflète dans des unités lithotectoniques successives telles que: le socle cristallin pré-appalachien, les sédiments et les volcanites de graben de marge passive déposés sur la plate-forme continentale et au large de celle-ci et les prismes clastiques synorogéniques. On peut distinguer cinq configurations du décollement basal, qui se répartissent en fonction des facies sédimentaires et des structures tectoniques antérieures aux charriages. Les relations entre la distribution des facies sédimentaires et la géométrie du décollement sont d'un grand intérêt dans l'analyse et la prédiction des variations longitudinales et transversales du niveau de décollement. La géométrie du décollement basal traduit la présence de baies et de promontoires de long des marges continentales qui se sont écartées par «rifting».

Notes: Zusammenfassung Die Geometrie der basalen Abscherung im Appalachen-Ouachita Faltungs- und Überschiebungsgürtel ist eng verknüpft mit lateralen und vertikalen Faziesänderungen. Aufeinanderfolgende lithotektonische Einheiten wie das kristalline Basement der Prä-Appalachen, die Grabensedimente und Vulkanite des Riftstadiums, der Schelf und Vorschelf des passiven Randes und die synorogenen klastischen Keile spiegeln die Evolution des tektonischen Gerüstes wider. Es lassen sich fünf unterschiedliche Formen basaler Abscherung in Beziehung zur sedimentären Fazies sowie zu den tektonischen Elementen vor der Überschiebung aufgliedern. Die Relationen zwischen sedimentärer Faziesverteilung und Abscherungsgeometrie sind für die Beschreibung und Vorhersage von parallel zum Streichen und senkrecht dazu verlaufenden Variationen des Abscherungsniveaus nützlich. Die Geometrie der basalen Abscherung reflektiert so ehemalige Vorsprünge und Einbuchtungen des auseinandergedrifteten Kontinentalrandes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01848683

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Two chick embryonic adhesion systems: Molecular vs tissue specificity (1981)

Thomas, William A. ; Edelman, Bruce A. ; Lobel, Susan M. ; [et al.]

New York, NY : Wiley-Blackwell

Journal of Supramolecular Structure and Cellular Biochemistry 16 (1981), S. 15-27

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ISSN: 0275-3723

Keywords: limb bud ; Fab inhibition ; Ca++ dependence ; specificity ; trypsin sensitivity ; immunological analysis ; cell surface antigen ; cerebellum ; chick embryo ; retina ; heart ; Chemistry ; Molecular Cell Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: We have investigated the adhesive properties of cells from several neural and nonneural chick embryonic tissues dissociated using modifications of the standard dissociation procedures employed routinely in this laboratory to obtain retinal cells. Each of these tissues (7-day optic tectum, retina, and heart, and 3.75-day hmb bud) displayed both Ca++-dependent (CD) and Ca++-independent (CI) aggregation, the relative rates of which differed from tissue to tissue In every case, cells prepared so as to display one mode of aggregation or the other cross-adhered readily to cells - regardless of tissue origin - displaying the same mode of aggregation. Cross adhesion was negligible between cells - even from the same tissue - prepared so as to display different modes of aggregation. Anti-retinal Fab molecules which inhibit selectively either the CI or CD aggregation of retina cells strongly inhibited the corresponding aggregation of optic tectum cells, but had no effect upon the aggregation (CI or CD) of heart cells. These results demonstrate the exis-tence in the tissues examined of dual adhesion mechanisms similar in Ca++ dependence and recognition properties to those of the retina, but showing certain immunological distinctions from the latter. The imrmunological relationship among the adhesion mechanisms from the various tissues is under continuing investigation.

Additional Material: 11 Ill.