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Geologic mapping, morphometric characterization, and statistical analyses of six venusian shield fields; insights into the processes related to their formation

Cole Nypaver, Nicholas P. Lang and Bradley J. Thomson
Geologic mapping, morphometric characterization, and statistical analyses of six venusian shield fields; insights into the processes related to their formation (in Field volcanology; a tribute to the distinguished career of Don Swanson, Michael P. Poland, Michael O. Garcia, Victor E. Camp and Anita L. Grunder)
Special Paper - Geological Society of America (February 2019) 538: 435-458

Abstract

Small shield volcanoes with basal diameters <20 km represent the most abundant type of volcano on Venus. These shield volcanoes number >>106 in population and often occur in clusters known as shield fields, which have been interpreted to be analogous to basaltic volcanic fields on Earth. Despite previous work on shield fields, questions related to edifice morphology and magma viscosity, timing relations of events across an individual field, volume of erupted material, and the role of tectonic structures are still unresolved. Here, we address those questions through geologic mapping, volumetric calculations, and statistical analysis of possible edifice alignments in six venusian shield fields: Asherat Colles, Chernava Colles, Monoshi Tholus, Nordenflycht Patera, Ran Colles, and Urutonga Colles. Our results indicate that all of these shield fields and their associated deposits are younger than the surrounding units within the mapping areas, and each field displays overlapping temporal relations with local extensional and contractional structures. Each field also displays a lack of a consistent pattern in the temporal distribution of volcanism with regards to edifice type. Analyses of possible edifice alignments suggest edifice trends that are consistent with mapped tectonic structures within all studied fields except Asherat Colles. Comparison of these six venusian fields to terrestrial basaltic volcanic fields shows that venusian fields may be up to two to three orders of magnitude larger in their areal expanse and volume of erupted material. Our results are consistent with previous interpretations of venusian shield fields representing low rates (likely <5X10 (super -4) km (super 3) /yr) of magma supply feeding these magmatic centers and highlight the effects of the resolution limit of the Magellan data set on interpreting fundamental geologic processes on the venusian surface.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 538
Title: Geologic mapping, morphometric characterization, and statistical analyses of six venusian shield fields; insights into the processes related to their formation
Title: Field volcanology; a tribute to the distinguished career of Don Swanson
Author(s): Nypaver, ColeLang, Nicholas P.Thomson, Bradley J.
Author(s): Poland, Michael P.
Author(s): Garcia, Michael O.
Author(s): Camp, Victor E.
Author(s): Grunder, Anita L.
Affiliation: Mercyhurst University, Department of Geology, Erie, PA, United States
Affiliation: U. S. Geological Survey, Cascades Volcano Observatory, Vancouver, WA, United States
Pages: 435-458
Published: 20190207
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 9780813795386
References: 75
Accession Number: 2020-016576
Categories: Extraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
Secondary Affiliation: University of Tennessee, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 2020
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