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Precambrian Geology of ChinaGeneral Precambrian Geology in China

Precambrian Geology of China: General Precambrian Geology in China [The Earth has an evolving history ca. 4.6 Ga old. Precambrian continents experienced complex geological evolution since the Early Precambrian onward and carry important records of the secular changes in tectonics and metallogeny, including, at least, three important tectonic events that are Neoarchean enormous crustal growth, tectonic regime inversion from pre-plate tectonics to plate tectonics, and Paleoproterozoic great oxygen event (GOE). Without question, Precambrian geology is a key issue to understand continental geology. Precambrian rocks are extensively distributed in China, not only in cratons, but also in Phanerozoic orogenic belts. The Chinese continent consists of several cratons and surrounding Phanerozoic orogenic belts (folded belts). The main old lands in China include the North China Block (NCB), South China Block (SCB), and Tarim Block (TRB), all of which have individual tectonic evolving histories. The NCB experienced complex geological evolution since the Early Precambrian onward and carries important records from the old continental nuclei, giant crustal growth episode, and cratonization (stabilization), then to the Paleoproterozoic rifting–subduction–accretion–collision with imprints of the GOE, and to the Late Paleoproterozoic–Neoproterozoic multistage rifting representing North China platform tectonic features. The TRB has two-layer basement of the Early Precambrian metamorphic complexes and Neoproterozoic sedimentary sequences. Three till sheets have been reported. The SCB consists of the Yangtze Block (YZB) and Cathaysia Block (CTB) that were cohered in the Neoproterozoic. The YZB recorded tectonic processes of the Early Precambrian crustal growth, 1.0–0.9 and 0.8–0.6 Ga metamorphic–magmatic events, and two Neoproterozoic glaciations. The CTB consists of ca. 1.8, 1.0–0.9 Ga, and ca. 0.8 Ga granitic gneisses and metamorphic rocks, indicating there was a vast Precambrian basement. The Neoproterozoic sedimentary rocks overlie partly on the basement. That the YZB and CTB have a Neoproterozoic uniform cover layer illustrates the SCB should form, at least, during 1.0–0.9 Ga. The Nanhua Rift System developed in the SCB in ca. 0.8–0.7 Ga, which probably represented a global event indicating breakup of the Rodinia Supercontinent. The Central Chinese Orogenic System with high-ultra-high-pressure metamorphic rocks supports a suggestion that the above-mentioned three old lands were collided to assemble a unified Chinese continent during the Pangea orogenic period.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Precambrian Geology of ChinaGeneral Precambrian Geology in China

Part of the Springer Geology Book Series
Editors: Zhai, Mingguo
Zhai, Mingguo; Zhou, Yanyan
Precambrian Geology of China — Aug 12, 2015
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Publisher
Springer Berlin Heidelberg
Copyright
© Springer-Verlag Berlin Heidelberg 2015
ISBN
978-3-662-47884-4
Pages
3 –56
DOI
10.1007/978-3-662-47885-1_1
Publisher site
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Abstract

[The Earth has an evolving history ca. 4.6 Ga old. Precambrian continents experienced complex geological evolution since the Early Precambrian onward and carry important records of the secular changes in tectonics and metallogeny, including, at least, three important tectonic events that are Neoarchean enormous crustal growth, tectonic regime inversion from pre-plate tectonics to plate tectonics, and Paleoproterozoic great oxygen event (GOE). Without question, Precambrian geology is a key issue to understand continental geology. Precambrian rocks are extensively distributed in China, not only in cratons, but also in Phanerozoic orogenic belts. The Chinese continent consists of several cratons and surrounding Phanerozoic orogenic belts (folded belts). The main old lands in China include the North China Block (NCB), South China Block (SCB), and Tarim Block (TRB), all of which have individual tectonic evolving histories. The NCB experienced complex geological evolution since the Early Precambrian onward and carries important records from the old continental nuclei, giant crustal growth episode, and cratonization (stabilization), then to the Paleoproterozoic rifting–subduction–accretion–collision with imprints of the GOE, and to the Late Paleoproterozoic–Neoproterozoic multistage rifting representing North China platform tectonic features. The TRB has two-layer basement of the Early Precambrian metamorphic complexes and Neoproterozoic sedimentary sequences. Three till sheets have been reported. The SCB consists of the Yangtze Block (YZB) and Cathaysia Block (CTB) that were cohered in the Neoproterozoic. The YZB recorded tectonic processes of the Early Precambrian crustal growth, 1.0–0.9 and 0.8–0.6 Ga metamorphic–magmatic events, and two Neoproterozoic glaciations. The CTB consists of ca. 1.8, 1.0–0.9 Ga, and ca. 0.8 Ga granitic gneisses and metamorphic rocks, indicating there was a vast Precambrian basement. The Neoproterozoic sedimentary rocks overlie partly on the basement. That the YZB and CTB have a Neoproterozoic uniform cover layer illustrates the SCB should form, at least, during 1.0–0.9 Ga. The Nanhua Rift System developed in the SCB in ca. 0.8–0.7 Ga, which probably represented a global event indicating breakup of the Rodinia Supercontinent. The Central Chinese Orogenic System with high-ultra-high-pressure metamorphic rocks supports a suggestion that the above-mentioned three old lands were collided to assemble a unified Chinese continent during the Pangea orogenic period.]

Published: Aug 12, 2015

Keywords: Precambian rocks; Main old lands; Geological characteristics; Unified continent; China

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