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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Guiana Shield
Sediment routing systems to the Atlantic rifted margin of the Guiana Shield Open Access
Evaluating the segmented post-rift stratigraphic architecture of the Guyanas continental margin Available to Purchase
Deciphering the Enigmatic Origin of Guyana's Diamonds Available to Purchase
The 1885 M 6.9 Earthquake in the French Guiana–Brazil Border: The Largest Midplate Event in the Nineteenth Century in South America Available to Purchase
Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton Open Access
The Karouni Gold Deposit, Guyana, South America: Part I. Stratigraphic Setting and Structural Controls on Mineralization Available to Purchase
The Karouni Gold Deposit, Guyana, South America: Part II. Hydrothermal Alteration and Mineralization Available to Purchase
Lateral variation of crustal properties from aerogeophysical data in northern Brazil Available to Purchase
West Africa: The World’s Premier Paleoproterozoic Gold Province Available to Purchase
Post-rift subsidence of the French Guiana hyper-oblique margin: from rift-inherited subsidence to Amazon deposition effect Available to Purchase
Abstract The recent surge of exploration activities over distal margins, with the acquisition of more and more high-quality and deep seismic data, has led to enhance concepts of the deformation and subsidence history of passive margins in general and sheared margins in particular. The French Guiana sheared margin is very narrow. The thinning of the upper crust is accommodated by few major faults relayed by well-expressed transfer zones, giving a general oblique trend to the margin. Another possible effect of the shear component during the rifting is the presence in the distal domain of a Moho high. Its exhumation is coeval with the emplacement of a deltaic system coming from the Demerara Plateau, evidencing a probably important early subsidence of the margin. This early subsidence in the late-rifting stage is increased during the early drifting, when the thinned crust reached its isostatic/thermal equilibrium in the Cenomano-Turonian before suffering an important Late Cretaceous sedimentation load. In the Palaeogene, starving of the margin and significant uplifts in the Guiana Craton are observed, possibly resulting from the rise of the Purus Arch (Andes fore-bulge?). Finally, the Amazon deposition by the Late Miocene–Pliocene provoked a large subsidence in the distal domain.