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Article: When did plate tectonics begin on the North China Craton? Insights from metamorphism

TitleWhen did plate tectonics begin on the North China Craton? Insights from metamorphism
從變質作用觀看板塊構造何時在華北克拉通開始
Authors
KeywordsArchean
North China Craton
Plate tectonics
Paleoproterozoic
Metamorphism
Issue Date2007
PublisherChina University of Geosciences (Beijing). The Journal's web site is located at http://dxqy.chinajournal.net.cn/
中國地質大學(北京)
Citation
Earth Science Frontiers, 2007, v. 14 n. 1, p. 19-32 How to Cite?
地學前緣, 2007, v. 14 n. 1, p. 19-32 How to Cite?
AbstractUnderstanding when and why plate tectonics began on Earth is one of the most important unresolved problems in earth sciences. As a final result of plate tectonics, continental collisional orogens are formed, and the identification of such orogens is regarded as a milestone in recognizing the operation of plate tectonics in Earth's history. Metamorphism of continental collisional belts is generally characterized by clockwise p-T paths, especially for those involving isothermal decompression following the peak metamorphism. Therefore, clockwise p-T paths involving isothermal decompression are considered one of the important indicators for recognition of plate tectonics, especially in the early history of the earth. As one of the oldest continental blocks in the world, the North China Craton is considered a promising area for applying the large-scale synthesis approach of metamorphic p-T paths in understanding tectonic settings or processes since extensive investigations have been undertaken on the p-T-t evolution of the basement rocks over the craton. Tectonically, the North China Craton is composed of three small continental blocks (Eastern Block, Yinshan Block, and Ordos Block) and three Paleoproterozoic mobile belts (Trans-North China Orogen, Khondalite Belt, and Jiao-Liao-Ji Belt). Metamorphism of late Archean basement rocks in the Eastern and Yinshan Blocks is characterized by anticlockwise p-T paths, mostly involving isobaric cooling, suggesting that the heating source of the metamorphism was related to the underplating or intrusion of large volumes of mantle-derived magmas. Although theoretically such mantle-derived magmas form under continental magmatic arc, mantle plume or continental rift environments, only a mantle plume model can reasonably explain spatial and temporal distribution, lithological association, and structural features of the late Archean basement rocks in the Eastern and Yinshan Blocks. Therefore, mantle plumes may be the major tectonic mechanism that governed the formation and evolution of the late Archean crust in the Eastern and Yinshan Blocks, and plate tectonics may not have operated in the two blocks during late Archean period. Metamorphism of the basement rocks in the Paleoproterozoic Khondalite Belt and the Trans-North China Orogen is both characterized by clockwise p-T paths involving isothermal decompression following peak metamorphism, which suggests that the two orogens underwent initial crustal thickening followed by rapid exhumation/uplift tectonic processes. Such tectonic processes are typical indicators of collisional orogens that accommodate plate tectonics. The Paleoproterozoic Jiao-Liao-Ji Belt can be divided into the southern and northern zones, of which the former is characterized by anticlockwise p-T paths, whereas the latter is characterized by clockwise p-T paths, also indicating a regime of plate tectonics. The time of the initiation of plate tectonics in the North China Craton can be approximated by the age of the earliest juvenile crustal components in the three Paleoproterozoic tectonic belts. So far, the convincing oldest, subduction-related, juvenile crustal component in the North China Craton is the 2.56 Ga Wutai granitoids in the Trans-North China Orogen, which can be used to approximate the timing of the onset of plate tectonics in the North China Craton.
Persistent Identifierhttp://hdl.handle.net/10722/72822
ISSN
2015 SCImago Journal Rankings: 0.408

 

DC FieldValueLanguage
dc.contributor.authorZhao, Gen_HK
dc.date.accessioned2010-09-06T06:45:25Z-
dc.date.available2010-09-06T06:45:25Z-
dc.date.issued2007en_HK
dc.identifier.citationEarth Science Frontiers, 2007, v. 14 n. 1, p. 19-32en_HK
dc.identifier.citation地學前緣, 2007, v. 14 n. 1, p. 19-32zh_HK
dc.identifier.issn1005-2321en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72822-
dc.description.abstractUnderstanding when and why plate tectonics began on Earth is one of the most important unresolved problems in earth sciences. As a final result of plate tectonics, continental collisional orogens are formed, and the identification of such orogens is regarded as a milestone in recognizing the operation of plate tectonics in Earth's history. Metamorphism of continental collisional belts is generally characterized by clockwise p-T paths, especially for those involving isothermal decompression following the peak metamorphism. Therefore, clockwise p-T paths involving isothermal decompression are considered one of the important indicators for recognition of plate tectonics, especially in the early history of the earth. As one of the oldest continental blocks in the world, the North China Craton is considered a promising area for applying the large-scale synthesis approach of metamorphic p-T paths in understanding tectonic settings or processes since extensive investigations have been undertaken on the p-T-t evolution of the basement rocks over the craton. Tectonically, the North China Craton is composed of three small continental blocks (Eastern Block, Yinshan Block, and Ordos Block) and three Paleoproterozoic mobile belts (Trans-North China Orogen, Khondalite Belt, and Jiao-Liao-Ji Belt). Metamorphism of late Archean basement rocks in the Eastern and Yinshan Blocks is characterized by anticlockwise p-T paths, mostly involving isobaric cooling, suggesting that the heating source of the metamorphism was related to the underplating or intrusion of large volumes of mantle-derived magmas. Although theoretically such mantle-derived magmas form under continental magmatic arc, mantle plume or continental rift environments, only a mantle plume model can reasonably explain spatial and temporal distribution, lithological association, and structural features of the late Archean basement rocks in the Eastern and Yinshan Blocks. Therefore, mantle plumes may be the major tectonic mechanism that governed the formation and evolution of the late Archean crust in the Eastern and Yinshan Blocks, and plate tectonics may not have operated in the two blocks during late Archean period. Metamorphism of the basement rocks in the Paleoproterozoic Khondalite Belt and the Trans-North China Orogen is both characterized by clockwise p-T paths involving isothermal decompression following peak metamorphism, which suggests that the two orogens underwent initial crustal thickening followed by rapid exhumation/uplift tectonic processes. Such tectonic processes are typical indicators of collisional orogens that accommodate plate tectonics. The Paleoproterozoic Jiao-Liao-Ji Belt can be divided into the southern and northern zones, of which the former is characterized by anticlockwise p-T paths, whereas the latter is characterized by clockwise p-T paths, also indicating a regime of plate tectonics. The time of the initiation of plate tectonics in the North China Craton can be approximated by the age of the earliest juvenile crustal components in the three Paleoproterozoic tectonic belts. So far, the convincing oldest, subduction-related, juvenile crustal component in the North China Craton is the 2.56 Ga Wutai granitoids in the Trans-North China Orogen, which can be used to approximate the timing of the onset of plate tectonics in the North China Craton.-
dc.languageengen_HK
dc.publisherChina University of Geosciences (Beijing). The Journal's web site is located at http://dxqy.chinajournal.net.cn/en_HK
dc.publisher中國地質大學(北京)zh_HK
dc.relation.ispartofEarth Science Frontiersen_HK
dc.relation.ispartof地學前緣zh_HK
dc.subjectArchean-
dc.subjectNorth China Craton-
dc.subjectPlate tectonics-
dc.subjectPaleoproterozoic-
dc.subjectMetamorphism-
dc.titleWhen did plate tectonics begin on the North China Craton? Insights from metamorphismen_HK
dc.title從變質作用觀看板塊構造何時在華北克拉通開始zh_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1005-2321&volume=14&issue=1&spage=19&epage=32&date=2007&atitle=When+did+plate+tectonics+begin+on+the+North+China+Craton?+Insights+from+metamorphismen_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.doi10.1016/S1872-5791(07)60002-5-
dc.identifier.hkuros127568en_HK
dc.identifier.volume14-
dc.identifier.issue1-
dc.identifier.spage19-
dc.identifier.epage32-

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