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A continental back-arc setting for the Namaqua belt:Evidence from the Kakamas Domain

Geoscience Frontiers 2022年第4期13卷 193-221页

作者： P.H.macey R.J.Thomas A.F.m.Kisters J.F.A.Diener m.angombe S.Doggart C.A.Groenewald C.W.Lambert J.A.miller H.minnaar H.Smith H.F.G.moen E.muvangua A.Nguno G.Shifotoka J.Indongo D.Frei C.Spencer P.le Roux R.A.Armstrong C.Tinguely Council for Geoscience P.O.Box 572BellvilleSouth Africa Department of Geology University of StellenboschSouth Africa Department of Geological Sciences University of Cape TownSouth Africa Geological Survey of Namibia WindhoekNamibia Department of Geology University of Free StateSouth Africa Department of Earth Sciences University of the Western CapeSouth Africa The Institute of Geoscience Research Dept.Applied GeologyCurtin UniversityPerthAustralia Department of Geological Sciences and Geological Engineering Queen’s UniversityKingstonCanada Geochronology and Tracers Facility British Geological SurveyNottingham NG125GGUK RSES Australian NationalUniversityCanberraACTAustralia

A study of the NW Kakamas Domain in South Africa/Namibia provides a new,unified lithostratigraphy and evolutionary history applicable to the whole Namaqua *** mesoproterozoic history ranges from~1350 ma to 960 ma,but isotopic evidence suggests it was built upon pre-existing Paleoproterozoic continental crust that extended west from the Archaean *** eastern Namaqualand,early rift-related magmatism and sedimentation at~1350 ma occurred in a confined ocean *** tectonic reversal and subduction at~1290–1240 ma led to establishment of the Areachap,Konkiep and Kaaien *** the Kakamas Domain,widespread deposition of pelitic sediments occurred at~1220 ma(Narries Group).These contain detrital zircons derived from proximal crust with ages between~2020 ma and 1800 ma(western Palaeoproterozoic domains)and 1350–1240 ma(eastern early Namaqua domains),suggesting pre-sedimentation *** pelites underwent granulite grade metamorphism at~1210 ma(peak conditions:4.5–6 kbar and 770–850°C),associated with voluminous,predominantly S-type granitoid orthogneisses between~1210 ma and 1190 ma(Eendoorn and Ham River Suites)and low-angle ductile(D_(2))deformation which continued until~1110 ma,interspersed with periods of *** enduring P-T regime is inconsistent with the expected crustal over-thickening associated with the generally-accepted collision-accretion Namaqualand ***,we propose the Namaqua Sector is a‘hot orogen’developed in a wide continental back-arc with subduction west of the present-day *** observed high geotherm resulted from thinned back-arc lithosphere accompanied by an influx of mantle-derived *** D_(2)deformation resulted from"bottom-driven"tectonics and viscous drag within the crust by convective flow in the underlying asthenospheric *** extended tectonothermal regime ceased at~1110 ma when SW-directed thrusting stacked the Namaqua Domains into their current positions,constrained in

关键词： Kakamas Namaqua Geodynamics Geochronology Hot orogeny mesoproterozoic

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