Lithological and alteration mapping using Landsat 8 and ASTER satellite data in the Reguibat Shield (West African Craton), North of Mauritania: implications for uranium exploration

2021 ◽  
Vol 14 (23) ◽  
Author(s):  
Mariem Mohameden Ishagh ◽  
Amin Beiranvand Pour ◽  
Hanafi Benali ◽  
Abdallahi Mohamedou Idriss ◽  
Sid’Ahmed Sidi Reyoug ◽  
...  
Keyword(s):  
Satellite Data ◽  
West African ◽  
Landsat 8 ◽  
West African Craton ◽  
Uranium Exploration

Worldview-2 and Landsat 8 Satellite Data for Seaweed Mapping along Karachi Coast

2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Muhammad Danish Siddiqui ◽  
Arjumand Z Zaidi
Keyword(s):  
Satellite Data ◽  
Spatial Scales ◽  
Economic Value ◽  
Vegetation Indices ◽  
Cost Effective ◽  
Geographical Information ◽  
Landsat 8 ◽  
Coverage Area ◽  
Breeding Sites ◽  
Marine Plant

<span>Seaweed is a marine plant or algae which has economic value in many parts of the world. The purpose of <span>this study is to evaluate different satellite sensors such as high-resolution WorldView-2 (WV2) satellite <span>data and Landsat 8 30-meter resolution satellite data for mapping seaweed resources along the coastal<br /><span>waters of Karachi. The continuous monitoring and mapping of this precious marine plant and their <span>breeding sites may not be very efficient and cost effective using traditional survey techniques. Remote <span>Sensing (RS) and Geographical Information System (GIS) can provide economical and more efficient <span>solutions for mapping and monitoring coastal resources quantitatively as well as qualitatively at both <span>temporal and spatial scales. Normalized Difference Vegetation Indices (NDVI) along with the image <span>enhancement techniques were used to delineate seaweed patches in the study area. The coverage area of <span>seaweed estimated with WV-2 and Landsat 8 are presented as GIS maps. A more precise area estimation <span>wasachieved with WV-2 data that shows 15.5Ha (0.155 Km<span>2<span>)of seaweed cover along Karachi coast that is <span>more representative of the field observed data. A much larger area wasestimated with Landsat 8 image <span>(71.28Ha or 0.7128 Km<span>2<span>) that was mainly due to the mixing of seaweed pixels with water pixels. The <span>WV-2 data, due to its better spatial resolution than Landsat 8, have proven to be more useful than Landsat<br /><span>8 in mapping seaweed patches</span></span></span></span></span></span></span></span></span></span></span></span></span></span><br /><br class="Apple-interchange-newline" /></span></span></span></span></span>

Retrieval of suspended sediment concentration of the Chilika Lake, India using Landsat-8 OLI satellite data

2021 ◽  
Vol 80 (8) ◽  
Author(s):  
Sujit Kumar Jally ◽  
Akhila Kumar Mishra ◽  
Sachikanta Balabantaray
Keyword(s):  
Suspended Sediment ◽  
Satellite Data ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration ◽  
Landsat 8 ◽  
Landsat 8 Oli ◽  
Chilika Lake

Structure, evolution and palaeogeography of the West African craton and bordering belts during the Neoproterozoic

1994 ◽  
Vol 69 (1-4) ◽  
pp. 307-326 ◽  
Author(s):  
M. Villeneuve ◽  
J.J. Cornée
Keyword(s):  
West African ◽  
Structure Evolution ◽  
The West ◽  
West African Craton

The magmatic evolution at the Moroccan outboard of the West African craton between the Late Neoproterozoic and the Early Palaeozoic

2008 ◽  
Vol 297 (1) ◽  
pp. 329-343 ◽  
Author(s):  
H. Ezzouhairi ◽  
M. L. Ribeiro ◽  
N. Ait Ayad ◽  
M. E. Moreira ◽  
A. Charif ◽  
...  
Keyword(s):  
West African ◽  
Magmatic Evolution ◽  
The West ◽  
West African Craton ◽  
Late Neoproterozoic ◽  
Early Palaeozoic

Paleomagnetism of the ~860 Ma Manso dyke swarm, West Africa: implications for the assembly of Rodinia

2021 ◽  
Author(s):  
Paul Yves Jean Antonio ◽  
Lenka Baratoux ◽  
Ricardo Ivan Ferreira Trindade ◽  
Sonia Rousse ◽  
Anani Ayite ◽  
...  
Keyword(s):  
West Africa ◽  
West African ◽  
Dyke Swarm ◽  
Jigsaw Puzzle ◽  
The West ◽  
West African Craton ◽  
Contact Test ◽  
Fine Grained ◽  
Paleomagnetic Pole ◽  
Coarse To Fine

&lt;p&gt;The West African Craton (WAC) is one of the major cratons in the Rodinia jigsaw puzzle (~1000&amp;#8211;750 Ma). In the Rodinian models, the position of West Africa is mainly constrained by the assumption that it had been a partner of Amazonia since the Paleoproterozoic. Unfortunately, no paleomagnetic data are available for these cratons when the Rodina supercontinent is considered tectonically stable (~1000-750 Ma). Thus, every new reliable paleomagnetic pole for the West African Craton during the Neoproterozoic times is of paramount importance to constrain its position and testing the Rodinia models. In this study we present a combined paleomagnetic and geochronological investigation for the Manso dyke swarm in the Leo-Man Shield, southern West Africa (Ghana). The ~860 Ma emplacement age for the NNW-trending Manso dykes is thus well-constrained by two new U-Pb apatite ages of 857.2 &amp;#177; 8.5 Ma and 855 &amp;#177; 16 Ma, in agreement with baddeleyite data. Remanence of these coarse-to-fine grained dolerite dykes is carried by stable single to pseudo-single domain (SD-PSD) magnetite. A positive baked-contact test, associated to a positive reversal test (Class-C), support the primary remanence obtained for these dykes (13 sites). Moreover, our new paleomagnetic dataset satisfy all the seven R-criteria (R=7). The ~860 Ma Manso pole can thus be considered as the first key Tonian paleomagnetic pole for West Africa. We propose that the West Africa-Baltica-Amazonia-Congo-S&amp;#227;o Francisco were associated in a long-lived WABAMGO juxtaposition (~1100&amp;#8211;800 Ma).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Keywords:&lt;/strong&gt; West Africa, Neoproterozoic, Tonian, Rodinia, paleomagnetism.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

Preserved ancient oceanic lithosphere within the Buem structural unit at the eastern margin of the west African craton

Lithos ◽  
2022 ◽  
pp. 106585
Author(s):  
Daniel Kwayisi ◽  
Marlina Elburg ◽  
Jeremie Lehmann
Keyword(s):  
Structural Unit ◽  
Oceanic Lithosphere ◽  
West African ◽  
The West ◽  
West African Craton ◽  
Eastern Margin

Neoproterozoic granitoids associated with the Bou-Azzer ophiolitic melange (Anti-Atlas, Morocco): evidence of adakitic magmatism in an arc segment at the NW edge of the West-African craton

2004 ◽  
Vol 39 (3-5) ◽  
pp. 285-293 ◽  
Author(s):  
E.H. Beraaouz ◽  
M. Ikenne ◽  
A. Mortaji ◽  
A. Madi ◽  
M. Lahmam ◽  
...  
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
Ophiolitic Mélange

Early Neoproterozoic rift-related magmatism in the Anti-Atlas margin of the West African craton, Morocco

2014 ◽  
Vol 255 ◽  
pp. 433-442 ◽  
Author(s):  
J. Javier Álvaro ◽  
André Pouclet ◽  
Hassan Ezzouhairi ◽  
Abderrahmane Soulaimani ◽  
El Hafid Bouougri ◽  
...  
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
Early Neoproterozoic
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