The Jebel Hadid structure (Al Kufrah Basin, SE Libya)—A possible impact structure and potential hydrocarbon trap?

Schmieder, M.; Buchner, E.; Heron, Daniel Paul Le

doi:10.1016/j.marpetgeo.2008.04.003

Cited by 16 publications

(6 citation statements)

References 62 publications

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“…As discussed above, besides impact cratering, there are similar discussions in the literature dealing with the formation mechanism of the enigmatic structures, including the Mousso (Buchner and Schmieder ) and Faya Basin (Schmieder and Buchner , ) structures in Chad, the Jebel Hadid structure in Libya (Schmieder et al. ), or until recently the Uneged Uul structure in Mongolia (Schmieder et al. ).…”

Section: Discussionmentioning

confidence: 85%

Geophysical and magneto‐structural study of the Maâdna structure (Talemzane, Algeria): Insights on its age and origin

Lamali

Rochette

Merabet

et al. 2016

Meteorit & Planetary Scien

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International audienceThe Maâdna structure is located approximately 400 km south of Algiers (33°19' N, 4°19' E) and emplaced in Upper-Cretaceous to Eocene limestones. Although accepted as an impact crater on the basis of alleged observations of shock-diagnostic features such as planar deformation features (PDFs) in quartz grains, previous works were limited and further studies are desirable to ascertain the structure formation process and its age. For this purpose, the crater was investigated using a multidisciplinary approach including field observations, detailed cartography of the different geological and structural units, geophysical surveys, anisotropy of magnetic susceptibility, paleomagnetism, and petrography of the collected samples. We found that the magnetic and gravimetric profiles highlight a succession of positive and negative anomalies, ones that might indicate the occurrence of a causative material which is at least in part identical. Geophysical analysis and modeling suggest the presence of this material within the crater at a depth of about 100 m below the surface. Using soil magnetic susceptibility measurements, the shallowest magnetized zone in the central part of the crater is identified as a recently deposited material. Paleomagnetic and rock magnetic experiments combined with petrographic observations show that detrital hematite is the main magnetic carrier although often associated with magnetite. A primary magnetization is inferred from a stable remanence with both normal and reverse directions, carried by these two minerals. Although this is supposed to be a chemical remagnetization, its normal polarity nature is considered to be a Pliocene component, subsequent to the crater formation. The pole falls onto the Miocene-Pliocene part of the African Apparent Polar Wander Path (APWP). Consequently, we estimate then formation of the Ma^adna crater to have occurred during the time period extending from the Late Miocene to the Early Pliocene. Unfortunately, our field and laboratory investigations do not allow us to confirm an impact origin for the crater as neither shatter cones, nor shocked minerals, were found. A dissolved diapir with inverted relief is suggested as an alternative to the impact hypothesis, which can still be considered as plausible. Only a drilling may provide a definite answer

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Section: Discussionmentioning

confidence: 85%

Geophysical and magneto‐structural study of the Maâdna structure (Talemzane, Algeria): Insights on its age and origin

Lamali

Rochette

Merabet

et al. 2016

Meteorit & Planetary Scien

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“…A 4.7 km wide structure, comprising a series of concentric ring forms ( Fig. 50 ), was detected by Schmieder et al (2009) centered at 20°52′12.43”/22°42′17.73E in the southern Al Kufrah basin of Libya. The structure seemingly occurs entirely in Nubian sandstone and would therefore be of post-Cretaceous age (see also BP and Oasis structures, above).…”

Section: The Impact Record Of Africamentioning

confidence: 99%

“… Schmieder et al (2009) proceeded to discuss alternative modes of origin, besides impact cratering, and concluded that magmatism, diapirism, sand volcanism, karst dissolution, or glacial erosion did not provide adequate options and, consequently, arrived at the conclusion that this structure likely represents a significantly eroded, complex impact structure. They noted a strong similarity on remote sensing imagery between Jebel Hadid and Tin Bider in Algeria.…”

Section: The Impact Record Of Africamentioning

confidence: 99%

Impact structures in Africa: A review

Reimold¹,

Koeberl²

2014

Journal of African Earth Sciences

127

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“…In a recent article, Schmieder et al. (2009) interpreted from remote sensing data the Jebel Hadid structure, in the southern Kufrah Basin, as an eroded complex impact structure, somehow similar to the Tin Bider impact structure (Algeria).…”

Section: Introductionmentioning

confidence: 99%

Endogenous and nonimpact origin of the Arkenu circular structures (al‐Kufrah basin—SE Libya)

Cigolini

Martino

Laiolo

et al. 2012

Meteorit & Planetary Scien

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Abstract-The twin Arkenu circular structures (ACS), located in the al-Kufrah basin in southeastern Libya, were previously considered as double impact craters (the ''Arkenu craters''). The ACS consist of a NE (Arkenu 1) and a SW structure (Arkenu 2), with approximate diameters of about 10 km. They are characterized by two shallow depressions surrounded by concentric circular ridges and silica-impregnated sedimentary dikes cut by local faults. Our field, petrographic, and textural observations exclude that the ACS have an impact origin. In fact, we did not observe any evidence of shock metamorphism, such as planar deformation features in the quartz grains of the collected samples, and the previously reported ''shatter cones'' are wind-erosion features in sandstones (ventifacts). Conversely, the ACS should be regarded as a ''paired'' intrusion of porphyritic stocks of syenitic composition that inject the Nubia Formation and form a rather simple and eroded ring dike complex. Stock emplacement was followed by hydrothermal activity that involved the deposition of massive magnetite-hematite horizons (typical of iron oxide copper-gold deposits). Their origin was nearly coeval with the development of silicified dikes in the surroundings. Plugs of tephritic-phonolitic rocks and lamprophyres (monchiquites) inject the Nubian sandstone along conjugate fracture zones, trending NNW-SSE and NE-SW, that crosscut the structural axis of the basin.

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The Jebel Hadid structure (Al Kufrah Basin, SE Libya)—A possible impact structure and potential hydrocarbon trap?

Cited by 16 publications

References 62 publications

Geophysical and magneto‐structural study of the Maâdna structure (Talemzane, Algeria): Insights on its age and origin

Geophysical and magneto‐structural study of the Maâdna structure (Talemzane, Algeria): Insights on its age and origin

Impact structures in Africa: A review

Endogenous and nonimpact origin of the Arkenu circular structures (al‐Kufrah basin—SE Libya)

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