| Titre | Graben-fissure systems in Guinevere Planitia and Beta Regio (264°-312°E, 24°-60°N), Venus, and implications for regional stratigraphy and mantle plumes |
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| Auteur | Ernst, R E; Desnoyers, D W; Head, J W; Grosfils, E B |
| Source | Icarus 164, 2, 2003 p. 282-316, https://doi.org/10.1016/s0019-1035(03)00126-x  Accès ouvert |
| Année | 2003 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 2002264 |
| Éditeur | Elsevier BV |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/s0019-1035(03)00126-x |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Région | Venus; Guinevere Planitia; Beta Regio |
| Sujets | caractéristiques structurales; fosses d'effondrement; fissures; filons rocheux; fractures; crevasses; géologie extraterrestre; géologie structurale |
| Illustrations | croquis cartographiques; diagrammes schématiques; images satellitaires; graphiques; tableaux |
| Diffusé | 2003 08 01 |
| Résumé | (disponible en anglais seulement)
Detailed mapping in a 14,000,000 km2 area of northwestern Guinevere Planitia and northern Beta Regio bounded by 264°-312°E, 24°-60°N has revealed thousands of
long extensional lineaments (graben, fissures and related fractures). These can be grouped into radiating, circumferential and linear systems. Thirty four radiating systems have been identified, of which 16 have radii greater than 300 km and eight
have radii greater than 1000 km. Twenty six linear (straight) systems with a length greater than 300 km have been distinguished of which six have a length greater than 1000 km. Linear systems are generally associated with rifts, although some may
represent distal portions of radiating systems. In addition, 19 circumferential systems, some associated with coronae, have been identified. The distribution of each system is compared with the host geology in order to place the graben-fissure
systems in a regional stratigraphic framework. The majority of systems are: (1) younger than tesserae, ridge belts and densely fractured plains, (2) coeval with, and in many cases, define fracture belts, (3) partially flooded by wrinkle-ridged plains
units, and (4) older than smooth and lobate plains units and young rifts. The inventory of radiating graben-fissure systems that we catalogue represents a database of tectono-magmatic centers that complements the centers defined using other criteria,
e.g., large volcanoes, coronae, and shield fields. We have attempted to identify those systems that are underlain by dike swarms in order to evaluate their relationship to mantle plumes. At least 11 of the radiating systems extend well beyond any
central topographic uplift and are therefore interpreted to be underlain by dike swarms. |
| GEOSCAN ID | 214178 |
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