A History of Tectono-Magmatism along the Parga Chasma Rift System on Venus

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  • Parga Chasma is a discontinuous rift system marking the southern boundary of the BAT region on Venus. Along a 1,500 km section of Parga Chasma, detailed mapping has revealed 5 coronae, 11 local rift segments distinct from a regional extension pattern, and 47 graben-fissure systems. These systems are often centred within coronae or large volcanoes, but many are isolated and indicate cryptic centres. Some of these magmatic centres are further observed as the loci of triple-junction rifting, collectively comprising the 11 local rift segments. Cross-cutting relationships between the corresponding graben-fissures and rift faults reveal synchronous formation, implying a genetic association. Additionally, cross-cutting relationships reveal these local events to postdate the regional extension, further indicating multiple stages of rifting. This provides an explanation for the discontinuous morphology of Parga Chasma, and its result has implications to explain the morphologies of other rift systems, both on Venus and Earth.

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  • Copyright © 2016 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2016


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