Geochemical Characteristics of the Nigerian anorogenic province

Batchelor, Richard A.

doi:10.1002/gj.3350220625

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…suite IlIa of Kampunzu and Mohr, this volume). olivine tholeiites, transitional magmas), though common (Bowden and Kinnaird 1984 b;Batchelor 1987), are not particularly significant for authors. olivine tholeiites, transitional magmas), though common (Bowden and Kinnaird 1984 b;Batchelor 1987), are not particularly significant for authors.…”

Section: Western Africamentioning

confidence: 98%

Magmatism in Extensional Structural Settings

Kampunzu¹,

Lubala²

1991

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Section: Western Africamentioning

confidence: 98%

Magmatism in Extensional Structural Settings

Kampunzu¹,

Lubala²

1991

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Petrogenesis of the peralkaline Dutsen Wai and Ropp complexes in the Nigerian younger granites: implications for crucial metal enrichments

Amuda

Yang

Deng

et al. 2020

International Geology Review

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Supplementary document for the paper: Petrogenesis of the peralkaline Dutsen Wai and Ropp complexes in the Nigerian Younger Granites: Implications for crucial metal enrichments. Amuda et al., 2020. Local geology and sampling Dutsen Wai plutonsThe complex consists of alkaline epizonal plutons, discordantly intruded into migmatite and granite gneiss basement. It comprises of two main phases; volcanic and plutonic rock units peculiar to the NYG province. Most of the intrusive plutons (over 90%) are made up of biotite granites, granite porphyry and albite riebeckite-arfvedsonite-aegerine granites.Structurally, the entire massifs trend nearly north-south (Supp Figure 1a). Remnants of volcanic breccias that strike almost east-west (050º ESE) border the extreme south of the complex (Supp Figure 1b).The most prominent structure is the series of NW-SE to nearly NS trending joint systems (Fig. 2a).Two peralkaline plutons (about 10 -15% by volume) are poorly exposed and covers an area of approximately 1.9km 2 , flanks the northeast and eastern margin of the main biotite granite (about 75% by volume) of the complex (Fig. 2a). A low-lying sheet like pink coloured medium to coarse-grained granite intrusion ('reddened' granite) straddled between the two peralkaline plutons (Supp Figure 1c). The roof zones of the granite outcrops appear compositionally homogenous. 15 samples (Dt's, DyL and Db's) were collected in a network at about 45 by 45m 2 systematic random grid pattern.

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An introduction to the crystalline basement of Africa

Key

1992

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The crystalline basement of Africa comprises three major suites of rocks: the granite-gneiss-greenstone association of Archaean cratonic nuclei; strongly deformed metamorphic suites in mobile belts, mainly of Proterozoic age; and anorogenic intrusions which include Phanerozoic intrusive magmatic rocks related to rifting. This heterogeneous basement is extensively concealed beneath a variable thickness of diverse, unmetamorphosed sedimentary and extrusive volcanic rocks and weathering products. The Archaean cratons have similar geological histories, which generally culminate with anorogenic potassic granites emplaced at about 2500 Ma. The history of the Kaapval Craton is prematurely curtailed at about 3050 Ma. The Limpopo Mobile Belt is uniquely Archaean: its development is linked to differential movement between the oldest cratonic elements of southern Africa. Elsewhere in Africa, the oldest Archaean record suggests an absence of thick continental crust: early greenstone belts formed above mantle plumes on mobile, thin crust. The development of the Proterozoic mobile belts is related both to collision of older cratons (Wilson cycle orogenesis) and to ensialic disruption of single cratons. Early extensional orogenic phases produced both active (new oceanic crust development) and failed rifts. The earliest Proterozoic mobile belts cut across Archaean cratonic domains and later belts may be superposed. Older fractures are commonly reactivated by new stress systems. Much of the Phanerozoic anorogenic magmatism is related to Mesozoic and Cenozoic continental fragmentation and rifting, possibly associated with hot spots (White & McKenzie 1989). Notwithstanding the relative antiquity of most of the basement, it is the effects of high-level brittle fracturing and weathering which largely control groundwater storage. The fracturing varies in age from Archaean, within the greenstone belts, to Phanerozoic, for faults related to movement of the African Plate, with ongoing Quaternary faulting in the major tensional rifts such as the East African Rift System. The thickest weathering profiles occur above the oldest erosion surfaces; regional thickness variations are controlled by past and present climatic differences.

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Geochemical Characteristics of the Nigerian anorogenic province

Cited by 3 publications

References 20 publications

Magmatism in Extensional Structural Settings

Magmatism in Extensional Structural Settings

Petrogenesis of the peralkaline Dutsen Wai and Ropp complexes in the Nigerian younger granites: implications for crucial metal enrichments

An introduction to the crystalline basement of Africa

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