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NARROW
Format
Article Type
Journal
Publisher
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Southern Africa
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Namibia (1)
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Asia
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Indian Peninsula
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India
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Kerala India (2)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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Sr-87/Sr-86 (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (1)
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rare earths (1)
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geologic age
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Paleozoic
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Cambrian (1)
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lower Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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igneous rocks
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igneous rocks
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plutonic rocks
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granites
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A-type granites (1)
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pegmatite (1)
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metamorphic rocks
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metamorphic rocks
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metasedimentary rocks
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khondalite (1)
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minerals
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oxides
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chrome spinel (1)
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phosphates
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fluorapatite (1)
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Primary terms
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Africa
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Southern Africa
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Namibia (1)
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-
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Asia
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Indian Peninsula
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India
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Kerala India (2)
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faults (1)
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igneous rocks
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plutonic rocks
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granites
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A-type granites (1)
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pegmatite (1)
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inclusions
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fluid inclusions (1)
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intrusions (1)
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isotopes
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stable isotopes
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Sr-87/Sr-86 (1)
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magmas (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (1)
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rare earths (1)
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metamorphic rocks
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metasedimentary rocks
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khondalite (1)
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metamorphism (1)
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orogeny (1)
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paleogeography (1)
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Paleozoic
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Cambrian (1)
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lower Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic
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Ediacaran (1)
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Vendian (1)
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sedimentary rocks
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clastic rocks
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sandstone (1)
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tectonics (1)
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rock formations
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Nama Group (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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sandstone (1)
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GeoRef Categories
Era and Period
Book Series
Date
Availability
Chemical Composition and Tectonic Setting of Chromian Spinels from the Ediacaran–Early Paleozoic Nama Group, Namibia Available to Purchase
Role of Pan-African events in the Circum-East Antarctic Orogen of East Gondwana: a critical overview Available to Purchase
Abstract Recent studies of Pan-African events in East Gondwana are critically reviewed, particularly recent models of amalgamation of East Gondwana during the Pan-African period. It is pointed out that critical data are insufficient to constrain the newly proposed models and so the classical model of the Grenvillian Circum-East Antarctic Orogen cannot yet be replaced. Grenvillian tectonothermal events with a peak between 1.0 and 1.2Ga assembled different crustal blocks of the East Antarctic Shield with different geohistories. Pan-African tectonothermal reworking took place over wide but selected areas of the orogen. Careful geochronological studies, including SHRIMP dating associated with structural and petrological investigations to correlate ages with those events, are shown to be important, since fluid-rich and/or deformational conditions are equally effective as temperature conditions for mineral recrystallization and resetting of isotopic systematics. Pan- African suture zones, one extending from the Mozambique Belt to the Shackleton Range and another connecting the Mozambique Belt to the Zambezi Belt, are equally possible, although the width of the southern Mozambique Ocean is poorly understood. The extent of Pan-African sutures in the Prydz Bay area is enigmatic, although they represent definite orogens. Palaeomagnetic studies may provide critical constraints in evaluating the sutures, provided that the age of magnetization is well established.