The Mesoproterozoic event within the Rehoboth Basement Inlier of Namibia: review and new aspects of stratigraphy, geochemistry, structure and plate tectonic setting

2005 ◽  
Vol 108 (4) ◽  
pp. 465-492 ◽  
Author(s):  
T. Becker
Keyword(s):  
Tectonic Setting ◽  
Plate Tectonic ◽  
Basement Inlier

Mesozoic – early Cenozoic volcanism, plutonism, and mineralization in southern British Columbia: A plate tectonic synthesis

1977 ◽  
Vol 14 (7) ◽  
pp. 1611-1624 ◽  
Author(s):  
John R. Griffiths
Keyword(s):  
British Columbia ◽  
Subduction Zone ◽  
Subduction Zones ◽  
Tectonic Setting ◽  
Spatial Relationship ◽  
Plate Tectonic ◽  
Time Space ◽  
Cenozoic Volcanism ◽  
Volcanic Belts ◽  
Early Cenozoic

Three time–space profiles have been constructed using geologic data from British Columbia between 49° N and 56° N. They illustrate variations across the Cordillera, (1) in the stratigraphic and tectonic setting of volcanism, (2) in the age and modal type of granitoids, and (3) in the distribution and types of copper and lead deposits related to volcanic and plutonic rocks. These profiles provide the basis for a plate tectonic synthesis of the Mesozoic–Cenozoic geology, illustrated by six true-scale cross sections.The preferred model has, in the Triassic, two eastward-dipping subduction zones, giving rise to the copper-rich Karmutsen and Nicola–Takla volcanics respectively. After collision of the two volcanic belts by the Early Jurassic, a single eastward-dipping subduction zone remained active until the Eocene. Magmas produced by partial melting and fractionation of subducted lithosphere occurred across the western 300 km of the Cordillera, leading to thickening of the crust, and eventually to anatectic melting to generate large batholiths now containing pendants of volcanics. Jurassic and later geologic and metallogenic events across the eastern 500 km of the Cordillera are the results of an increased heat flux through inhomogeneous crust of varying thickness, comprised of relict ocean floor, continental margin sediments, older volcanics, and ancient cratonic basement. This results in patterns of metamorphism, volcanism, and plutonism which have no simple spatial relationship to the subduction zone.

scholarly journals A Gondwana pre-break up related magmatism in Bafoussam area, west Cameroon: source characteristics and 40Ar/39Ar geochronology

2019 ◽  
Vol 7 (1) ◽  
pp. 23
Author(s):  
Gus Djibril Kouankap Nono ◽  
Pierre Wotchoko ◽  
Evine Laure Tanko Njiosseu ◽  
Sylvestre Ganno ◽  
Joelle Flore Tene Djoukam ◽  
...  
Keyword(s):  
High Temperature ◽  
Early Stage ◽  
Tectonic Setting ◽  
Central Africa ◽  
High Alumina ◽  
Primitive Mantle ◽  
Plate Tectonic ◽  
Calc Alkaline ◽  
Source Characteristics ◽  
Break Up

The Gondwana pre-break up related formations in Bafoussam area are transitional calc-alkaline doleritic dykes exhibiting high Alumina and low Ti-Mg contents. Their REE compositions are similar to those of E-MORB (Nd/Nb≈1, Zr/Nb≤20). A high partial melting of about 20% of Garnet peridotites source having primitive mantle composition, is inferred to the studied rocks. They are slightly evolved 50<Mg#<54, and its clinopyroxenes are augite of high temperature (600°C-1100°C). The studied dykes were emplaced in a within-plate tectonic setting and yield a 40Ar-39Ar plateau ages of 229±7Ma. These ages are slightly different from those of dolerites from the Oban-Obudu massif (Nigeria), from the basaltic dyke of the Cameroon Volcanic Line and from the Karoo-Ferrar mafic magmatism, all interpreted as magmatism that preceded the break-up of Gondwana. The emplacement age of 229±7Ma of dolerites from Bafoussam area relates them to the very early stage of Gondwana pre-break up magmatism in central Africa.    

Plate‐tectonic setting of the Tasmanian region

1997 ◽  
Vol 44 (5) ◽  
pp. 543-560 ◽  
Author(s):  
J‐Y. Royer ◽  
N. Rollet
Keyword(s):  
Tectonic Setting ◽  
Plate Tectonic

scholarly journals Archaean and early Proterozoic basement provinces in Greenland

1994 ◽  
Vol 160 ◽  
pp. 37-40
Author(s):  
F Kalsbeek
Keyword(s):  
Tectonic Setting ◽  
Precambrian Basement ◽  
Plate Tectonic ◽  
Pb Isotope ◽  
Early Proterozoic ◽  
Isotope Data ◽  
Laboratory Facilities ◽  
Proterozoic Basement ◽  
University Scientists ◽  
Broad Outline

Information about the age and plate-tectonic setting of Precambrian basement terrains is of major importance for the evaluation of their mineral potential. The Geological Survey of Greenland (GGU) has therefore over the last two decades collected and published geochronological information on Greenland basement areas, based on whole rock Rb-Sr, Pb-Pb, Sm-Nd and zircon U-Pb isotope data. These isotope data, together with other geochemical information, also yield important clues for the plate-tectonic setting of the investigated terrains. GGU does not have laboratory facilities for isotope work, and most studies were therefore carried out in cooperation with university scientists from Denmark and abroad. This effort has led to the recognition of a number of distinct Precambrian basement provinces. A broad outline of results is given below.

Carboniferous bimodal volcanic rocks and their plate tectonic setting, Hainan Island

1992 ◽  
Vol 11 (1) ◽  
pp. 70-79 ◽  
Author(s):  
Bangdong Xia ◽  
Jinhai Yu ◽  
Zhong Fang ◽  
Ciyin Wang ◽  
Guangyu Shi
Keyword(s):  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Hainan Island ◽  
Plate Tectonic
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