The monogenetic Bayuda Volcanic Field, Sudan – New insights into geology and volcanic morphology

Lenhardt, Nils; Borah, Suranjana Bhaswati; Lenhardt, Sukanya Z.; Bumby, Adam John; Ibinoof, Montasir A.; Salih, Salih A.

doi:10.1016/j.jvolgeores.2018.03.010

Cited by 10 publications

(9 citation statements)

References 67 publications

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“…The largest maar (800 m in diameter and 386 m deep) in the area is the Hosh Ea Dalam (32°35′38,32″E, 18°24′29,07″N). None of the 15 maars has a permanent lake, and are only shallow "salt pans" (Almond et al, 1969;Lenhardt et al, 2018).…”

Section: Sudanmentioning

confidence: 99%

Volcanic Lakes in Africa: The VOLADA_Africa 2.0 Database, and Implications for Volcanic Hazard

et al. 2021

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Volcanic lakes pose specific hazards inherent to the presence of water: phreatic and phreatomagmatic eruptions, lahars, limnic gas bursts and dispersion of brines in the hydrological network. Here we introduce the updated, interactive and open-access database for African volcanic lakes, country by country. The previous database VOLADA (VOlcanic LAke DAta Base, Rouwet et al., Journal of Volcanology and Geothermal Research, 2014, 272, 78–97) reported 96 volcanic lakes for Africa. This number is now revised and established at 220, converting VOLADA_Africa 2.0 in the most comprehensive resource for African volcanic lakes: 81 in Uganda, 37 in Kenya, 33 in Cameroon, 28 in Madagascar, 19 in Ethiopia, 6 in Tanzania, 2 in Rwanda, 2 in Sudan, 2 in D.R. Congo, 1 in Libya, and 9 on the minor islands around Africa. We present the current state-of-the-art of arguably all the African volcanic lakes that the global experts and regional research teams are aware of, and provide hints for future research directions, with a special focus on the volcanic hazard assessment. All lakes in the updated database are classified for their genetic origin and their physical and chemical characteristics, and level of study. The predominant rift-related volcanism in Africa favors basaltic eruptive products, leading to volcanoes with highly permeable edifices, and hence less-developed hydrothermal systems. Basal aquifers accumulate under large volcanoes and in rift depressions providing a potential scenario for phreatomagmatic volcanism. This hypothesis, based on a morphometric analysis and volcanological research from literature, conveys the predominance of maar lakes in large monogenetic fields in Africa (e.g. Uganda, Cameroon, Ethiopia), and the absence of peak-activity crater lakes, generally found at polygenetic arc-volcanoes. Considering the large number of maar lakes in Africa (172), within similar geotectonic settings and meteoric conditions as in Cameroon, it is somewhat surprising that “only” from Lake Monoun and Lake Nyos fatal CO2 bursts have been recorded. Explaining why other maars did not experience limnic gas bursts is a question that can only be answered by enhancing insights into physical limnology and fluid geochemistry of the so far poorly studied lakes. From a hazard perspective, there is an urgent need to tackle this task as a community.

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Section: Sudanmentioning

confidence: 99%

Volcanic Lakes in Africa: The VOLADA_Africa 2.0 Database, and Implications for Volcanic Hazard

et al. 2021

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“…The Bayuda Desert is located in and around the Great Bend of the Nile in the Sudan. Its basement is made up of three terranes: The Bayuda terrane forms the largest section of the desert and is separated by the Atmur-Delgo suture from the Gabgaba terrane in the east and by the Keraf suture from the Halfa terrane in the north (Abdelsalam et al, 2003;Lenhardt et al, 2018) (Fig. 1B).…”

Section: Geological Settingmentioning

confidence: 99%

“…Based on the observations of Lenhardt et al (2018), the majority of the ca. 70 monogenetic volcanoes within the BMVF are cinder cones, except for 15 maar volcanoes and tuff rings that are concentrated in the south and the north of the field (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…Lucassen et al (2008) were the first to present Nd-, Sr-and Pb-isotope data for several Cretaceous to Quaternary volcanic fields in Sudan and southern Egypt to derive a conceptual model for the evolution of the lithospheric mantle beneath NE Africa. Lenhardt et al (2018) described the volcanology of maar deposits and scoria cones in the BMVF in detail. This contribution sets out to derive a petrogenetic model and to constrain the evolution of the magmas based on petrography and geochemical (major, trace elements as well as Nd-, Sr-, Pb-and Hf-isotopes) analyses of unweathered lava and tephra samples of the BMVF.…”

Section: Introductionmentioning

confidence: 99%

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The Quaternary monogenetic Bayuda Volcanic Field, Sudan – Insights into mantle and crustal processes during magma petrogenesis

Lötter

Lenhardt

Viereck

et al. 2022

Lithos

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“…Over the last decade, Digital Elevation Models (DEM) from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Shuttle Radar Topography Mission (STRM) have been extensively used in volcano geomorphology (Inbar et al, 2011, Grosse et al, 2012, Gong et al, 2016Camiz et al, 2017); as they can provide important geomorphological parameters such as shape, slope, gradients, altitudes and relief (Kervyn et al, 2008). Several previous works have highlighted the importance and the full potential offered by DEMs in many aspects of volcanological studies (Fornaciai et al, 2012;Kervyn et al, 2012; Gong et al, 2016; Favalli and Fornaciai, 2017; Lenhardt et al, 2018) including the study of genesis and evolution of volcanic edifices (Wood, 1980a,b;Thouret, 1999, Prima andYoshida, 2010), and the relationship between topography and hazards related to volcanic landforms (e.g. Hickson et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Geomorphological Classification of Volcanic Cones in the Itasy Volcanic Field, Central Madagascar

Raharimahefa¹,

Rasoazanamparany²

2018

International Journal of Geology and Earth Sciences

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The Itasy Volcanic Field (IVF) is a monogenetic volcanic field located in the central highlands of Madagascar and is characterized by numerous volcanic cones displaying various geomorphological landforms. The IVF was a result of Pliocene to Quaternary volcanic eruptions and mainly composed of basaltic volcanic cones and trachyte domes. This paper aims to describe and to establish a geomorphological classification of basaltic volcanic cones within the IVF, based on their morphometric characteristics such as shape and diameter of the cone base; slope of the flanks of the edifice, and height of the crater relative to the cone base. Digital Elevation Model (DEM) data from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Shuttle Radar Topography Mission (STRM) were used, coupled with remote sensing data from Google Earth Pro and field investigation. DEM and imagery analyses and processing were performed using ArcGIS and Global Mapper. Five types of major basaltic volcanic landforms were identified within the IVF: semi-circular cones (e.g. Kasigie cone), representing 8.39% of the identified cones; symmetric and asymmetric horseshoes-shaped edifices (e.g. Mananasy and Fasia cones), which are the most dominant 74.8% of the cones; fissure cones (e.g. Mandetika cone) forming 5.34% of the cones; multiple clustered -shaped breached cones forming 6.1% of the volcanic cones (e.g. Ambohitritainerina cone) and single cone with multiple craters (e.g. Ambohitromby cone), which represent 6.1% of the cone. This contribution enables the characterization of morphological types of the volcanic cones within the IVF.

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The monogenetic Bayuda Volcanic Field, Sudan – New insights into geology and volcanic morphology

Cited by 10 publications

References 67 publications

Volcanic Lakes in Africa: The VOLADA_Africa 2.0 Database, and Implications for Volcanic Hazard

Volcanic Lakes in Africa: The VOLADA_Africa 2.0 Database, and Implications for Volcanic Hazard

The Quaternary monogenetic Bayuda Volcanic Field, Sudan – Insights into mantle and crustal processes during magma petrogenesis

Geomorphological Classification of Volcanic Cones in the Itasy Volcanic Field, Central Madagascar

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