Journal ArticleDOI
Thermal evolution of Archean basement rocks from the eastern part of the North China craton and its bearing on tectonic setting
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TLDR
The basement rocks in the eastern zone of the North China craton are composed of pretectonic tonalitic-trondhjemitic-granodioritic gneisses and syntectonic granitoids, with rafts of supracrustal rocks consisting of ultramafic to felsic volcanic and sedimentary rocks, metamorphosed over a range of conditions from greenschist to granulite facies as mentioned in this paper.Abstract:
The basement rocks in the eastern zone of the North China craton are composed predominantly of pretectonic tonalitic-trondhjemitic-granodioritic gneisses and syntectonic granitoids, with rafts of supracrustal rocks consisting of ultramafic to felsic volcanic and sedimentary rocks, metamorphosed over a range of conditions from greenschist to granulite facies. Most mafic granulites, amphibolites, and some pelitic gneisses and schists preserve the prograde, peak, and post-peak textures. The prograde metamorphic stage is indicated by mineral inclusions within minerals of the peak stage, represented by the assemblages of hornblende + plagioclase + quartz ± biotite in mafic granulites, chlorite + actinolite + epidote + plagioclase + quartz in amphibolites, and biotite + plagioclase + quartz in pelitic gneisses. The peak stage is shown by assemblages of orthopyroxene + clinopyroxene + garnet + plagioclase + quartz in the mafic granulites, hornblende + plagioclase + quartz + garnet in garnetiferous amphibolites, ...read more
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Late Archean to Paleoproterozoic evolution of the North China Craton: key issues revisited
TL;DR: In this paper, the authors proposed a model for the evolution of the North China Craton that envisages discrete Eastern and Western Blocks that developed independently during the Archean and collided along the Trans-North China Orogen during a Paleoproterozoic orogenic event.
Journal ArticleDOI
Archean blocks and their boundaries in the North China Craton: lithological, geochemical, structural and P–T path constraints and tectonic evolution
TL;DR: In this paper, a mantle plume model is proposed for the formation and evolution of Late Archean basement rocks in the Eastern and Western Blocks based on a combination of extensive exposure of TTG gneisses, affinities of mafic rocks to continental tholeiitic basalts, presence of voluminous komatiitic rocks, dominant diaprism-related domiform structures, anticlockwise P-T paths, and a short time span from the primary emplacement of the TTG and ultramafic-to-maf
Journal ArticleDOI
Precambrian geology of China
Guochun Zhao,Peter A. Cawood +1 more
TL;DR: In this article, the authors proposed a model for the origin of the 2.55-2.50-Ga metamorphic pulse in the North China Craton (NCC), which is interpreted as a major phase of juvenile crustal growth in the craton.
Journal ArticleDOI
Lithotectonic elements of Precambrian basement in the North China Craton: Review and tectonic implications
Guochun Zhao,Mingguo Zhai +1 more
TL;DR: In this article, the authors show that the 2.6-2.5 Ga basement rocks in the eastern and western parts of the NCC formed under different tectonic settings from those in the central part, consistent with subduction and continent-continent collisional belts.
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Paleoproterozoic tectonic evolution of the North China Craton
Timothy M. Kusky,Jianghai Li +1 more
TL;DR: In this article, the authors synthesize the geology, geochronology, and tectonics of the Neo-archean through Mesoproterozoic evolution of the North China Craton.
References
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TL;DR: Basaltic volcanism'samples' the Earth's mantle to great depths, because solid-state convection transports deep material into the (shallow) melting region as mentioned in this paper.
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Convection Plumes in the Lower Mantle
TL;DR: The concept of crustal plate motion over mantle hotspots has been advanced to explain the origin of the Hawaiian and other island chains and the origin the Walvis, Iceland-Farroe and other aseismic ridges as discussed by the authors.
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Pressure-Temperature-Time Paths of Regional Metamorphism I. Heat Transfer during the Evolution of Regions of Thickened Continental Crust
TL;DR: In this article, the development of regional metamorphism in areas of thickened continental crust is investigated in terms of the major controls on regional-scale thermal regimes, such as the total radiogenic heat supply within the thickened crust, the supply of heat from the mantle, the thermal conductivity of the medium and the length and time scales of erosion of the continental crust.
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Remnants of ≥3800 Ma crust in the Chinese part of the Sino-Korean craton
TL;DR: In this article, the detrital zircons in an Archean metaquartzite are 3550 Ma or older; about one-fourth have ages between 3800 and 3850 Ma.
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The origins of granulites: a metamorphic perspective
TL;DR: A thorough survey of over 90 granulite terranes or occurrences reveals that over 50% of them record P-T conditions outside the 7.5 ± 1 kbar and 800 ± 50 °C average granulites regime preferred by many authors as discussed by the authors.