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</html>";s:4:"text";s:10944:"Vibrational (Infrared and Raman) Spectra of Minerals and Related Compounds Nikita V. Chukanov 2019-11-28 The book presents new data Introduction: The Morokweng impact crater situated in the North West Province of South Africa was formed ~1452 Ma ago, i.e. If our ass essment is correct, Morokweng represents the third largest known terrestrial impact structure. Andreoli et al. Here we present new PGE analyses from the Morokweng impact melt sheet. Shock deformation features mark the extent of a large central uplift with a diameter of ~ 80 km, and a crater final rim of ~19010 km. Full article available in PDF version. Key words: Morokweng, Crater, Bouguer, Magnetics, Morphometry. The Morokweng impact structure in northwest South Africa (Fig. Here we present new results of a detailed petrographic and chemical investigation of impact melt rock and country rock samples. Besides, the literature published on it overwhelmingly calls it an "impact structure". close to the Jurassic-Cretaceous (J-K) boundary, by an impact of LL-6. I, outer limit of suevite, melt breccia; II, outer limit of brecciated and faulted basement Map provided by the Morokweng Consortium, 3. Introduction: The Morokweng impact crater (cen-tered 26o20/S, 23o32/E) in the North West Province of South Africa was formed at 1452 Ma ago by an im-pact of a LL-6 chondrite [1]. The target rocks of this impact crater mostly include Archaean granitoids, mafic gneisses, greenstones, mafic to acid lavas, and The Morokweng impact structure is centered at 2332' E and 2620' S, close to the border with Botswana in the Northwest Province of South Africa. A recent study, led by Gavin Kenny of the Swedish Museum of Natural History, reported the age of the Morokweng impact structure in South Africa. Geochimica et Cosmochimica Acta 65, 299-309. Estimates for the diameter of the Morokweng impact structure have varied sig-nicantly. The crater, formed by an asteroid 5-10 km (3-6 miles) in diameter, is at least about 160 km (100 miles)in diameter and the age is . The Morokweng crater (or Morokweng impact structure) is an impact crater buried beneath the Kalahari Desert near the town of Morokweng in the Northwest Province of South Africa, close to the border with Botswana. matrix) in the Chesapeake Bay impact structure; and the method of impact stratigraphy applied to aging of the K-T boundary associated with mass extinction. The size of Morokweng, for which diameters ranging from 70 to 165 kilometers have been quoted before, and which has important implications regarding its relation to the J-K boundary, remains an open question. 1a) is almost entirely covered by Cenozoic Kalahari Group sediments. This anomaly forms a central 30-km-diameter near- Morokweng impact structure, South Africa: Evidence for the impact of a large ordinary chondrite projectile at the Jurassic-Cretaceous boundary. Results of surface geological studies support earlier suggestions that this feature could represent an impact structure. Morokweng crater (Morokweng Impact Structure), Vryburg, Naledi Local Municipality, Dr Ruth Segomotsi Mompati District Municipality, North West, South Africa : Meteorite impact crater, situated north-west of Vryburg. Our data reveal high PGE concentrations and high degree of PGE correlation through the melt sheet. Finally, the eccentric position of the well-studied Morokweng impact melt sheet [1, 2, 3. The Morokweng impact crater stands out in all available geophysical and geological datasets of South Africa as a remarkable set of concentric rings with diameters ranging from ~30 km to ~260 km. Full PDF Package Download Full PDF Package. As such, most impact-related evidence comes from drill holes which have penetrated the structure (Fig. Shaded DEM of Morokweng crater showing present topographic elevation of the structure. This impact structure is approximately 80 kilometers in diameter and contains impact melt rocks that formed and cooled immediately after the impact. [I] have since reported the presence of charnockitic rocks from a drillcore into the so-called 'Morokweng intrusion'. The central aeromagnetic anomaly of this structure is caused by a 30-km-wide melt body. Interpreted geology of the Morokweng impact structure, with location of selected boreholes. The Morokweng impact crater in South Africa (close to the border with Botswana; Fig. The well-illustrated volume is not indexed. Susan J Webb. A large impact structure has been identified around Morokweng in the Northwest Province of South Africa. Conclusions: the Morokweng impact stands out as a set of concentric rings and arches in the Bouguer gravity and magnetic images (Figures 2, 3). The crater, discovered in 1994, is buried beneath the Kalahari Desert and is at least about 70 km in diameter. For example, on discovery of the structure, Corner et al. As such, most impact-related evidence comes from drill holes which have penetrated the structure (Fig.1b), with size con-straints largely based on regional geophysical data. Fig. Late Jurassic age for the Morokweng impact structure, southern Africa. According to Stettler [4], the central Morokweng structure could be a low-density, plug-like body, such as a magnetic syenite or granite. Regression analysis was. This Paper. sediments. A short summary of this paper. The crater is said to have been formed by a 3km (1.8mi) diameter asteroid, and caused a crater at least 70km (43.8mi) in diameter. Samples from an autochthonous . Previous size estimates for the Morokweng impact structure ranged between 70 and 340 km, and those workers favoring a very large size speculated on the role that the Morokweng impact might . Geophysical, petrographical, and geochemical data indicate the presence of a large impact structure in the area around Morokweng, Northwest Province, South Africa, possibly up to 340 km in diameter. Large meteorite impacts and planetary evolution; II This struc- ture is also easily recognizable on satellite imagery [11], including GoogleEarth. The age is estimated to be . The Popigai crater (or astrobleme) in Siberia, Russia, is tied with the Manicouagan Crater as the fourth largest verified impact crater on Earth. The Morokweng crater (or Morokweng impact structure) is an impact crater buried beneath the Kalahari Desert near the town of Morokweng in the Northwest Province of South Africa, close to the border with Botswana. When Bechuanaland came under British control in 1886, Morokweng was designated a Native Reserve, with an area that by the late 1950s was estimated to be 160,000 morgen in extent. Simplified stratigraphy of boreholes drilled in the melt sheet. Impact craters in the Solar System: Top-left: 500-kilometre-wide (310 mi) crater Engelier on Saturn's moon Iapetus; Top-right: Recently formed (between July 2010 and May 2012) impact crater on Mars showing a pristine ray system of ejecta Bottom-left: 50,000-year-old Meteor Crater east of Flagstaff, Arizona, U.S. on Earth; Bottom-right: The prominent crater Tycho in the southern highlands of . INTRODUCTION The ~144 Ma. 1) is a complex, multi-ring structure buried below Cenozoic Kalahari sediments and Quaternary sand. Although the structure is poorly defined and appears to have been eroded by 1-1.5 km prior to depo- No other large-scale impact structure has yet revealed such a big piece of intact meteorite. 2. This fact was conclusively proven when, in 2006, a 25cm piece of the original meteorite was found at a depth of 770m. Morokweng Crater Size and Impact 4. Lewis Ashwal. The existence of a large, near-circular, structure centred on the area around Morokweng (23"32'E/26"31'S) in the Northwest Province of South Africa, and possibly extending into southern Botswana, is inferred from aeromagnetic and gravity data. [2] In 1994, a large impact structure, the Morokweng impact structure, was discovered in the ground near the village. Morokweng was clearly an impact structure. Download Download PDF. RE~SUMI~ - Une grande structure d'impact profond~ment ~rod~e, nomm~e structure d'impact de Morokweng est centr6e sur le DSme de Ganyesa ~ environ 80 km au nord-ouest de Vryburg, a ~t~ identifi~e r~cemment de fa~on d~finitive dans la Province du Nord-Ouest d'Afrique du Sud. MODIS, 2. terrestrial impact structures, possibly of early Proterozoic age. Marian Tredoux. 2628S 2332E Morokweng crater, or Morkweng impact structure, is a large meteor impact crater found buried beneath the Kalahari Desert, near the town of Morokweng in South Africa. [2] References [ edit] search Solid debris from outer space that hits planetary surface.mw parser output .hatnote font style italic .mw parser output div.hatnote padding left 1.6em margin bottom 0.5em .mw parser output .hatnote font style normal .mw parser output. Morokweng, Sorted by : Morokweng, 1. 7, 8, 9, 13] relative to the Landsat rings may be the result of a post-impact structural rebound [13]. Marco Andreoli. Earth and Planetary Science Letters, 1997. Morokweng impact structure (MIS) is largely buried be-neath up to 150 m of Cenozoic Kalahari Group sedi-ments and is, thus, mainly constrained from regional ge-ophysical surveys and samples recovered from borehole cores [3]. [1] Contents, 1 Description, 2 References, 3 Further reading, 4 External links, Description [ edit] At Morokweng, they are found east of the S-N-trending magnetic structure and include (1) a central, strongly variable anomaly pattern with small, scattered positive anomalies that occupy a roughly circular area of 25-35 km diameter, an estimated remanence with declination 20, and an inclination of 40 and (2) a 15-to 20-km-wide annular zone a. Rodger Hart. Fig. Abstract, The existence of a large, near-circular, structure centred on the area around Morokweng (2332E/2631S) in the Northwest Province of South Africa, and possibly extending into southern Botswana, is inferred from aeromagnetic and gravity data. The Morokweng impact structure in South Africa was formed 145 Ma ago, at the time of the minor mass extinction that marks the Jurassic-Cretaceous boundary. 1b), with size constraints largely based on regional geophysical data. The Morokweng impact structure is an impact structure buried beneath the Kalahari Desert near the town of Morokweng in South Africa 's North West province, close to the border with Botswana. The structure was recognized as a circular positive magnetic anomaly of up to 350 nT above regional background. In case of the Morokweng impact structure, the original topographic expression of the impact, its crater, has been long since been destroyed by erosion leaving only the deformed bedrock , which is the impact structure, behind. A large bolide impact created the 100-kilometre (62 mi) diameter crater approximately 35 million years ago during the late Eocene epoch (Priabonian stage). It might be linked to the Eocene-Oligocene extinction event. ";s:7:"keyword";s:26:"morokweng impact structure";s:5:"links";s:984:"<a href="https://api.o91.coding.al/pxzjxi/best-colleges-for-political-science-in-california">Best Colleges For Political Science In California</a>,
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