Dating in sierra leone
The Archaean of Sierra Leone is divisible into two pene-contemporaneous tectonothermal units, the Liberian granite—greenstone terrain, and the Kasila Group Mobile Belt with its associated klippen, the Marampa Group.The granite—greenstone terrain consists of the Sula Group supracrustals, deformed and metamorphosed over an underlying gneissose granite migmatite Basement, yielding ages of about 2700 Ma.Taylor is due to be sentenced on May 30, with prosecutors demanding an 80-year prison term, and defence lawyers arguing he should at least be given a sentence that leaves him some hope for life after release.While the Sierra Leone court is formally based in that country's capital, Taylor's trial is being staged in Leidschendam, a suburb of The Hague, Netherlands, for fear holding it in West Africa could destabilize the region.That gem is second in size only to the Cullinan diamond which was unearthed in South Africa in 1905, at 3,106 carats uncut, according to the Cape Town Diamond Museum.The Cullinan was cut into several gems, including two set into the sceptre and crown of the British Crown Jewels.‘The purposely cruel and savage crimes committed included public executions and amputations of civilians, the display of decapitated heads at checkpoints, the killing and public disembowelment of a civilian whose intestines were then stretched across the road to make a check point, public rapes of women and girls, and people burned alive in their homes,’ wrote prosecutor Brenda Hollis in a pre-hearing brief.
Most velocity-depth values fall outside the expected range for Mesozoic–early Cenozoic ocean floor and stretched continental crust.A pronounced change in Moho depth lies on the line of a long offset fracture zone extending from the African margin, implying underplating was influenced by a pre-existing discontinuity in the lithosphere.Other seismic lines show 7.0–7.2 km s basement above the underplated zone extending into water depths of almost 5 km.This is probably the intrusive foundation of early-formed crust over a mantle hot-spot.It is suggested that the development of the Sierra Leone Rise is distinct from other Atlantic hot-spot features to which it has been linked because of its setting in a region of intense lithospheric shear.A Christian pastor working in a Sierra Leone mine has found a 706-carat diamond, which could be the tenth largest ever found.The precious stone was found by Emmanuel Momoh, who was working in the Kono region, in the east of the country.He said: 'Most recent exceptional diamond discoveries have been made by large commercial miners that mine very large volumes of kimberlite ore and process it with advanced equipment.'Artisanal mining tends to produce smaller, lower quality diamonds because the diamonds suffer breakage and erosion.' Zimnisky said the stone would likely be sold outside Sierra Leone, despite the government's assertion, for better access to buyers.Without a professional assessment of the diamond's potential flaws and colouring it is impossible to value the stone.It will be sold in Sierra Leone in a 'transparent' bidding process to benefit the country, according to a government statement.It read: 'A 706-carat diamond was presented to President Dr Ernest Bai Koroma yesterday evening.'Receiving the diamond President Koroma thanked the chief and his people for not smuggling the diamond out of the country.'Diamond expert Paul Zimnisky said it could be 'between the 10th and 15th largest gem-diamonds ever recovered' and such a find is very rare in a small mine.