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期刊名称: Gondwana Research
Volume:20    Issue:1        Page:6-25

The early Precambrian odyssey of the North China Craton: A synoptic overview期刊论文

作者: Zhai Ming-Guo Santosh M

页码: 6-25
被引频次: 834
期刊名称: Gondwana Research
ISSN: 1342-937X
卷期: Volume:20    Issue:1
语言: English
摘要: The crustal growth and stabilization of the North China Craton (NCC) relate to three major geological events in the Precambrian: (1) a major phase of continental growth at ca. 2.7 Ga; (2) the amalgamation of micro-blocks and cratonization at ca. 2.5 Ga; and (3) Paleoproterozoic rifting-subduction-accretion-collision tectonics and subsequent high-grade granulite fades metamorphism-granitoid magmatism during ca. 2.0-1.82. The major period of continental growth during 2.9-2.7 Gain the NCC correlates with the global growth of Earth's crust recognized from other regions. The enormous volume of tonalite-trondhjemite-granodiorite (TTG) rocks and associated komatiite-bearing magmatic suites developed during this period possibly suggest the manifestation of plume tectonics. The cratonization of the NCC at the end of Neoarchean at ca. 2.5 Ga (Archean-Proterozoic boundary) through the amalgamation of micro-blocks was accompanied by granulite facies metamorphism and voluminous intrusion of crustally-derived granitic melts leading to the construction of the basic tectonic framework of the NCC. Several Neoarchean greenstone belts surround the micro-blocks and represent the vestiges of older arc-continent collision. The next major imprint in the NCC is the Paleoproterozoic orogenic events during 2.35 -1.82 Ga which involved rifting followed by subduction accretion -collision processes, followed by plume-triggered extension and rifting, offering important insights into modern-style plate tectonics operating in the Paleoproterozoic. Extreme crustal metamorphism and formation of high pressure (HP) and ultra-high temperature (UHT) orogens during 1950-1820 Ma accompanied the subduction-collision process and the suturing of continental blocks within the Paleoproterozoic supercontinent Columbia. Multiple subduction zones with opposing subduction polarity promoted the rapid assembly of crustal fragments of the NCC and their incorporation into the Columbia supercontinent. The HP and HT-UHT granulites demonstrate two main stages of metamorphism at ca. 1.95-1.89 Ga and at ca. 1.85-1.82 Ga, exhuming the basement rocks from lowermost crust level to the lower-middle crust level. With the emplacement of extensive mafic dyke swarms associated with continental rifting, and the intrusion of anorogenic magmatic suites, the evolution of the NCC into a stable continental platform was finally accomplished. (C) 2011 International Association for Gondwana Research. Published by Elsevier BM. All rights reserved.
相关主题: Geochemistry, Geochronology, North China Craton, Precambrian, Plate tectonics, Crustal growth, METAMORPHIC EVOLUTION, PLATE-TECTONICS, KHONDALITE SERIES, ISOTOPIC CONSTRAINTS, ZIRCON U-PB, ARCHEAN CRUSTAL EVOLUTION, GEOSCIENCES, MULTIDISCIPLINARY, PALEOPROTEROZOIC EVOLUTION, EASTERN HEBEI, GEOLOGICAL SIGNIFICANCE, TECTONIC EVOLUTION, Earth, Metamorphism (Geology), Crust, Subduction zones (Geology), Rocks, Metamorphic, Tectonics (Geology), Greenstone belts,






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