A mid-Palaeozoic ocean–continent transition in the Mazongshan subduction–accretion complex, Beishan, NW China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution
Accretionary orogens contain key evidence for the conversion of oceanic to continental crust. The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present...
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| Veröffentlicht in: | Geological magazine 2020-11, Vol.157 (11), p.1877-1897 |
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| creator | Wang, J.-X. Zhang, K.-X. Windley, Brian F. Song, B.-W. Kou, X.-H. Wang, S.-D. Wang, L.-J. |
| description | Accretionary orogens contain key evidence for the conversion of oceanic to continental crust. The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present new data on the structure, petrology, geochemistry and zircon U–Pb isotope ages of the Mazongshan subduction–accretion complex, which is a tectonic mélange with a block-in-matrix structure. The blocks are of serpentinized peridotite, basalt, gabbro, basaltic andesite, chert and seamount sediments within a matrix that is mainly composed of fore-arc-trench turbidites. U–Pb zircon ages of two gabbros are 454.6 ± 2.5 Ma and 434.1 ± 3.6 Ma, an andesite has a U–Pb zircon age of 451.3 ± 3.5 Ma and a tuffaceous slate has the youngest U–Pb zircon age of 353.6 ± 5.1 Ma. These new isotopic ages, combined with published data on ophiolitic mélanges from central Beishan, indicate that the subduction–accretion of Beishan in the southernmost Central Asian Orogenic Belt lasted until Late Ordovician – Early Carboniferous time. Structure and age data demonstrate that the younging direction of accretion was southwards and that the subduction zone dipped continuously to the north. Accordingly, these results record the conversion of oceanic to continental crust in the southern Beishan accretionary collage. |
| doi_str_mv | 10.1017/S0016756820000114 |
| format | Article |
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The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present new data on the structure, petrology, geochemistry and zircon U–Pb isotope ages of the Mazongshan subduction–accretion complex, which is a tectonic mélange with a block-in-matrix structure. The blocks are of serpentinized peridotite, basalt, gabbro, basaltic andesite, chert and seamount sediments within a matrix that is mainly composed of fore-arc-trench turbidites. U–Pb zircon ages of two gabbros are 454.6 ± 2.5 Ma and 434.1 ± 3.6 Ma, an andesite has a U–Pb zircon age of 451.3 ± 3.5 Ma and a tuffaceous slate has the youngest U–Pb zircon age of 353.6 ± 5.1 Ma. These new isotopic ages, combined with published data on ophiolitic mélanges from central Beishan, indicate that the subduction–accretion of Beishan in the southernmost Central Asian Orogenic Belt lasted until Late Ordovician – Early Carboniferous time. Structure and age data demonstrate that the younging direction of accretion was southwards and that the subduction zone dipped continuously to the north. Accordingly, these results record the conversion of oceanic to continental crust in the southern Beishan accretionary collage.</description><identifier>ISSN: 0016-7568</identifier><identifier>EISSN: 1469-5081</identifier><identifier>DOI: 10.1017/S0016756820000114</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>absolute age ; Accretion ; Age ; Age composition ; Andesite ; andesites ; Asia ; Basalt ; basalts ; Beishan Mountains ; Belts ; Carboniferous ; cathodoluminescence ; Central Asian orogenic belt ; chemical composition ; Chert ; China ; Continental crust ; Conversion ; crust ; Data ; Deposition ; Far East ; Gabbro ; Gabbros ; genesis ; Geochemistry ; Geological time ; Geophysics ; igneous and metamorphic rocks ; igneous rocks ; Isotopes ; Lead ; Lower Carboniferous ; Magma ; major elements ; Mazongshan Complex ; melange ; middle Paleozoic ; nesosilicates ; northwestern China ; Oceanic crust ; Oceanic trenches ; Ophiolites ; Ordovician ; Original Article ; Orogeny ; orthosilicates ; Palaeozoic ; Paleo-Asian Ocean ; paleogeography ; Paleozoic ; Peridotite ; Petrogenesis ; petrography ; Petrology ; plate tectonics ; plutonic rocks ; reconstruction ; sampling ; Seamounts ; Sediments ; silicates ; solid Earth (tectonophysics) ; Stratigraphy ; Subduction ; Subduction (geology) ; Subduction zones ; Tectonics ; trace elements ; Turbidites ; U/Pb ; Upper Ordovician ; volcanic rocks ; Zircon ; zircon group</subject><ispartof>Geological magazine, 2020-11, Vol.157 (11), p.1877-1897</ispartof><rights>Cambridge University Press 2020</rights><rights>GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Abstract, Copyright, Cambridge University Press</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a376t-fec6832fbf172e996930e5cc37725631c83be705ffdb3d0da8e22b258502f7cf3</citedby><cites>FETCH-LOGICAL-a376t-fec6832fbf172e996930e5cc37725631c83be705ffdb3d0da8e22b258502f7cf3</cites><orcidid>0000-0002-8097-8396</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0016756820000114/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,780,784,27922,27923,55626</link.rule.ids></links><search><creatorcontrib>Wang, J.-X.</creatorcontrib><creatorcontrib>Zhang, K.-X.</creatorcontrib><creatorcontrib>Windley, Brian F.</creatorcontrib><creatorcontrib>Song, B.-W.</creatorcontrib><creatorcontrib>Kou, X.-H.</creatorcontrib><creatorcontrib>Wang, S.-D.</creatorcontrib><creatorcontrib>Wang, L.-J.</creatorcontrib><title>A mid-Palaeozoic ocean–continent transition in the Mazongshan subduction–accretion complex, Beishan, NW China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution</title><title>Geological magazine</title><addtitle>Geol. Mag</addtitle><description>Accretionary orogens contain key evidence for the conversion of oceanic to continental crust. The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present new data on the structure, petrology, geochemistry and zircon U–Pb isotope ages of the Mazongshan subduction–accretion complex, which is a tectonic mélange with a block-in-matrix structure. The blocks are of serpentinized peridotite, basalt, gabbro, basaltic andesite, chert and seamount sediments within a matrix that is mainly composed of fore-arc-trench turbidites. U–Pb zircon ages of two gabbros are 454.6 ± 2.5 Ma and 434.1 ± 3.6 Ma, an andesite has a U–Pb zircon age of 451.3 ± 3.5 Ma and a tuffaceous slate has the youngest U–Pb zircon age of 353.6 ± 5.1 Ma. These new isotopic ages, combined with published data on ophiolitic mélanges from central Beishan, indicate that the subduction–accretion of Beishan in the southernmost Central Asian Orogenic Belt lasted until Late Ordovician – Early Carboniferous time. Structure and age data demonstrate that the younging direction of accretion was southwards and that the subduction zone dipped continuously to the north. Accordingly, these results record the conversion of oceanic to continental crust in the southern Beishan accretionary collage.</description><subject>absolute age</subject><subject>Accretion</subject><subject>Age</subject><subject>Age composition</subject><subject>Andesite</subject><subject>andesites</subject><subject>Asia</subject><subject>Basalt</subject><subject>basalts</subject><subject>Beishan Mountains</subject><subject>Belts</subject><subject>Carboniferous</subject><subject>cathodoluminescence</subject><subject>Central Asian orogenic belt</subject><subject>chemical composition</subject><subject>Chert</subject><subject>China</subject><subject>Continental crust</subject><subject>Conversion</subject><subject>crust</subject><subject>Data</subject><subject>Deposition</subject><subject>Far East</subject><subject>Gabbro</subject><subject>Gabbros</subject><subject>genesis</subject><subject>Geochemistry</subject><subject>Geological time</subject><subject>Geophysics</subject><subject>igneous and metamorphic rocks</subject><subject>igneous rocks</subject><subject>Isotopes</subject><subject>Lead</subject><subject>Lower Carboniferous</subject><subject>Magma</subject><subject>major elements</subject><subject>Mazongshan Complex</subject><subject>melange</subject><subject>middle Paleozoic</subject><subject>nesosilicates</subject><subject>northwestern China</subject><subject>Oceanic crust</subject><subject>Oceanic trenches</subject><subject>Ophiolites</subject><subject>Ordovician</subject><subject>Original Article</subject><subject>Orogeny</subject><subject>orthosilicates</subject><subject>Palaeozoic</subject><subject>Paleo-Asian Ocean</subject><subject>paleogeography</subject><subject>Paleozoic</subject><subject>Peridotite</subject><subject>Petrogenesis</subject><subject>petrography</subject><subject>Petrology</subject><subject>plate tectonics</subject><subject>plutonic rocks</subject><subject>reconstruction</subject><subject>sampling</subject><subject>Seamounts</subject><subject>Sediments</subject><subject>silicates</subject><subject>solid Earth (tectonophysics)</subject><subject>Stratigraphy</subject><subject>Subduction</subject><subject>Subduction (geology)</subject><subject>Subduction zones</subject><subject>Tectonics</subject><subject>trace elements</subject><subject>Turbidites</subject><subject>U/Pb</subject><subject>Upper Ordovician</subject><subject>volcanic rocks</subject><subject>Zircon</subject><subject>zircon 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China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution</title><author>Wang, J.-X. ; Zhang, K.-X. ; Windley, Brian F. ; Song, B.-W. ; Kou, X.-H. ; Wang, S.-D. ; Wang, L.-J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a376t-fec6832fbf172e996930e5cc37725631c83be705ffdb3d0da8e22b258502f7cf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>absolute age</topic><topic>Accretion</topic><topic>Age</topic><topic>Age composition</topic><topic>Andesite</topic><topic>andesites</topic><topic>Asia</topic><topic>Basalt</topic><topic>basalts</topic><topic>Beishan Mountains</topic><topic>Belts</topic><topic>Carboniferous</topic><topic>cathodoluminescence</topic><topic>Central Asian orogenic belt</topic><topic>chemical composition</topic><topic>Chert</topic><topic>China</topic><topic>Continental crust</topic><topic>Conversion</topic><topic>crust</topic><topic>Data</topic><topic>Deposition</topic><topic>Far East</topic><topic>Gabbro</topic><topic>Gabbros</topic><topic>genesis</topic><topic>Geochemistry</topic><topic>Geological time</topic><topic>Geophysics</topic><topic>igneous and metamorphic rocks</topic><topic>igneous rocks</topic><topic>Isotopes</topic><topic>Lead</topic><topic>Lower Carboniferous</topic><topic>Magma</topic><topic>major elements</topic><topic>Mazongshan Complex</topic><topic>melange</topic><topic>middle Paleozoic</topic><topic>nesosilicates</topic><topic>northwestern China</topic><topic>Oceanic crust</topic><topic>Oceanic trenches</topic><topic>Ophiolites</topic><topic>Ordovician</topic><topic>Original Article</topic><topic>Orogeny</topic><topic>orthosilicates</topic><topic>Palaeozoic</topic><topic>Paleo-Asian Ocean</topic><topic>paleogeography</topic><topic>Paleozoic</topic><topic>Peridotite</topic><topic>Petrogenesis</topic><topic>petrography</topic><topic>Petrology</topic><topic>plate tectonics</topic><topic>plutonic rocks</topic><topic>reconstruction</topic><topic>sampling</topic><topic>Seamounts</topic><topic>Sediments</topic><topic>silicates</topic><topic>solid Earth (tectonophysics)</topic><topic>Stratigraphy</topic><topic>Subduction</topic><topic>Subduction (geology)</topic><topic>Subduction zones</topic><topic>Tectonics</topic><topic>trace elements</topic><topic>Turbidites</topic><topic>U/Pb</topic><topic>Upper Ordovician</topic><topic>volcanic rocks</topic><topic>Zircon</topic><topic>zircon group</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, J.-X.</creatorcontrib><creatorcontrib>Zhang, K.-X.</creatorcontrib><creatorcontrib>Windley, Brian F.</creatorcontrib><creatorcontrib>Song, B.-W.</creatorcontrib><creatorcontrib>Kou, X.-H.</creatorcontrib><creatorcontrib>Wang, S.-D.</creatorcontrib><creatorcontrib>Wang, L.-J.</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Water Resources Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest Natural Science 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evolution</atitle><jtitle>Geological magazine</jtitle><addtitle>Geol. Mag</addtitle><date>2020-11</date><risdate>2020</risdate><volume>157</volume><issue>11</issue><spage>1877</spage><epage>1897</epage><pages>1877-1897</pages><issn>0016-7568</issn><eissn>1469-5081</eissn><abstract>Accretionary orogens contain key evidence for the conversion of oceanic to continental crust. The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present new data on the structure, petrology, geochemistry and zircon U–Pb isotope ages of the Mazongshan subduction–accretion complex, which is a tectonic mélange with a block-in-matrix structure. The blocks are of serpentinized peridotite, basalt, gabbro, basaltic andesite, chert and seamount sediments within a matrix that is mainly composed of fore-arc-trench turbidites. U–Pb zircon ages of two gabbros are 454.6 ± 2.5 Ma and 434.1 ± 3.6 Ma, an andesite has a U–Pb zircon age of 451.3 ± 3.5 Ma and a tuffaceous slate has the youngest U–Pb zircon age of 353.6 ± 5.1 Ma. These new isotopic ages, combined with published data on ophiolitic mélanges from central Beishan, indicate that the subduction–accretion of Beishan in the southernmost Central Asian Orogenic Belt lasted until Late Ordovician – Early Carboniferous time. Structure and age data demonstrate that the younging direction of accretion was southwards and that the subduction zone dipped continuously to the north. Accordingly, these results record the conversion of oceanic to continental crust in the southern Beishan accretionary collage.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/S0016756820000114</doi><tpages>21</tpages><orcidid>https://orcid.org/0000-0002-8097-8396</orcidid></addata></record> |
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| subjects | absolute age Accretion Age Age composition Andesite andesites Asia Basalt basalts Beishan Mountains Belts Carboniferous cathodoluminescence Central Asian orogenic belt chemical composition Chert China Continental crust Conversion crust Data Deposition Far East Gabbro Gabbros genesis Geochemistry Geological time Geophysics igneous and metamorphic rocks igneous rocks Isotopes Lead Lower Carboniferous Magma major elements Mazongshan Complex melange middle Paleozoic nesosilicates northwestern China Oceanic crust Oceanic trenches Ophiolites Ordovician Original Article Orogeny orthosilicates Palaeozoic Paleo-Asian Ocean paleogeography Paleozoic Peridotite Petrogenesis petrography Petrology plate tectonics plutonic rocks reconstruction sampling Seamounts Sediments silicates solid Earth (tectonophysics) Stratigraphy Subduction Subduction (geology) Subduction zones Tectonics trace elements Turbidites U/Pb Upper Ordovician volcanic rocks Zircon zircon group |
| title | A mid-Palaeozoic ocean–continent transition in the Mazongshan subduction–accretion complex, Beishan, NW China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution |
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