Geochemistry,Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane:Implications for Syn-Collapse Magmatism of Orogen
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摘要
Syn-collapse magmatism is a critical issue for evolution of the continental orogen.The Dabie Orogen is a typical orogen which was suffered from a complete collapse.Two kinds of granitoids,namely,the coarse-grained diorite and the fine-grained granite,are recognized at the center of the Luotian extensional dome,providing an opportunity to decipher the syn-collapse magmatism in the Dabie Orogen.The diorites(125±3 Ma)are high K calc-alkaline rocks,with low SiO_2(51.9 wt.%–56.6 wt.%)and high MgO(3.5 wt.%–4.0 wt.%)contents.They are enriched in LREE and LILEs(e.g.,Ba,K,Rb)and depleted in HFSEs(e.g.,Ta,Nb,and Hf)with low ratio of Sr/Y(30.82–46.89).The granites(118±2 Ma)are shoshonite series rocks,with relatively high SiO_2(68.9 wt.%–72.6 wt.%)and low MgO(0.32 wt.%–0.66 wt.%)contents.They are also enriched in LREE and LILEs with weakly negative Eu anomalies(δEu=0.81–0.85),and are depleted in HFSEs with low Sr contents(338 ppm–477 ppm)and Sr/Y ratios(23.80–33.13).Therefore,the two kinds of granitoids have no geochemical characteristics of adakitic rocks,suggesting that they were generated from a normal or thinned crust level.The diorites have quite negative zirconε_(Hf)(t)values(-18.4 to-21.1),suggesting they were from partial melting of the mafic lower continental crust.The granites have relatively higher zirconε_(Hf)(t)values(-14.4 to-18.1).The granites also contains a series of old inherited zircon cores,such as two upper intercept ages of 2 628±41 and 1 840±37 Ma,and a concordant age of 807±9 Ma.All these features suggest that the granites were generated from partial melting of the felsic middle-lower continental crust.Thus,the Huilanshan Early Cretaceous granitoids coupled with the Luotian extensional dome revealed the collapsed process of the Dabie Orogen.
Syn-collapse magmatism is a critical issue for evolution of the continental orogen.The Dabie Orogen is a typical orogen which was suffered from a complete collapse.Two kinds of granitoids,namely,the coarse-grained diorite and the fine-grained granite,are recognized at the center of the Luotian extensional dome,providing an opportunity to decipher the syn-collapse magmatism in the Dabie Orogen.The diorites(125±3 Ma)are high K calc-alkaline rocks,with low SiO_2(51.9 wt.%–56.6 wt.%)and high MgO(3.5 wt.%–4.0 wt.%)contents.They are enriched in LREE and LILEs(e.g.,Ba,K,Rb)and depleted in HFSEs(e.g.,Ta,Nb,and Hf)with low ratio of Sr/Y(30.82–46.89).The granites(118±2 Ma)are shoshonite series rocks,with relatively high SiO_2(68.9 wt.%–72.6 wt.%)and low MgO(0.32 wt.%–0.66 wt.%)contents.They are also enriched in LREE and LILEs with weakly negative Eu anomalies(δEu=0.81–0.85),and are depleted in HFSEs with low Sr contents(338 ppm–477 ppm)and Sr/Y ratios(23.80–33.13).Therefore,the two kinds of granitoids have no geochemical characteristics of adakitic rocks,suggesting that they were generated from a normal or thinned crust level.The diorites have quite negative zirconε_(Hf)(t)values(-18.4 to-21.1),suggesting they were from partial melting of the mafic lower continental crust.The granites have relatively higher zirconε_(Hf)(t)values(-14.4 to-18.1).The granites also contains a series of old inherited zircon cores,such as two upper intercept ages of 2 628±41 and 1 840±37 Ma,and a concordant age of 807±9 Ma.All these features suggest that the granites were generated from partial melting of the felsic middle-lower continental crust.Thus,the Huilanshan Early Cretaceous granitoids coupled with the Luotian extensional dome revealed the collapsed process of the Dabie Orogen.
Syn-collapse magmatism is a critical issue for evolution of the continental orogen.The Dabie Orogen is a typical orogen which was suffered from a complete collapse.Two kinds of granitoids,namely,the coarse-grained diorite and the fine-grained granite,are recognized at the center of the Luotian extensional dome,providing an opportunity to decipher the syn-collapse magmatism in the Dabie Orogen.The diorites(125±3 Ma)are high K calc-alkaline rocks,with low SiO_2(51.9 wt.%–56.6 wt.%)and high MgO(3.5 wt.%–4.0 wt.%)contents.They are enriched in LREE and LILEs(e.g.,Ba,K,Rb)and depleted in HFSEs(e.g.,Ta,Nb,and Hf)with low ratio of Sr/Y(30.82–46.89).The granites(118±2 Ma)are shoshonite series rocks,with relatively high SiO_2(68.9 wt.%–72.6 wt.%)and low MgO(0.32 wt.%–0.66 wt.%)contents.They are also enriched in LREE and LILEs with weakly negative Eu anomalies(δEu=0.81–0.85),and are depleted in HFSEs with low Sr contents(338 ppm–477 ppm)and Sr/Y ratios(23.80–33.13).Therefore,the two kinds of granitoids have no geochemical characteristics of adakitic rocks,suggesting that they were generated from a normal or thinned crust level.The diorites have quite negative zirconε_(Hf)(t)values(-18.4 to-21.1),suggesting they were from partial melting of the mafic lower continental crust.The granites have relatively higher zirconε_(Hf)(t)values(-14.4 to-18.1).The granites also contains a series of old inherited zircon cores,such as two upper intercept ages of 2 628±41 and 1 840±37 Ma,and a concordant age of 807±9 Ma.All these features suggest that the granites were generated from partial melting of the felsic middle-lower continental crust.Thus,the Huilanshan Early Cretaceous granitoids coupled with the Luotian extensional dome revealed the collapsed process of the Dabie Orogen.
引文
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Defant,M.J.,Drummond,M.S.,1990.Derivation of some Modern Arc Magmas by Melting of Young Subducted Lithosphere.Nature,347(6294):662-665.https://doi.org/10.1038/347662a0
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Gao,S.,Luo,T.C.,Zhang,B.R.,et al.,1998.Chemical Composition of the Continental Crust as Revealed by Studies in East China.Geochimica et Cosmochimica Acta,62(11):1959-1975.https://doi.org/10.1016/s0016-7037(98)00121-5
Hacker,B.R.,Ratschbacher,L.,Webb,L.,et al.,1998.U/Pb Zircon Ages Constrain the Architecture of the Ultrahigh-Pressure Qinling-Dabie Orogen,China.Earth and Planetary Science Letters,161(1/2/3/4):215-230.https://doi.org/10.1016/s0012-821x(98)00152-6
Hacker,B.R.,Ratschbacher,L.,Webb,L.,et al.,2000.Exhumation of UltrahighPressure Continental Crust in East Central China:Late Triassic-Early Jurassic Tectonic Unroofing.Journal of Geophysical Research:Solid Earth,105(B6):13339-13364.https://doi.org/10.1029/2000jb900039
He,Y.S.,Li,S.G.,Hoefs,J.,et al.,2011.Post-Collisional Granitoids from the Dabie Orogen:New Evidence for Partial Melting of a Thickened Continental Crust.Geochimica et Cosmochimica Acta,75(13):3815-3838
Hou,Z.H.,2005.Sm-Nd and Zircon SHRIMP U-Pb Dating of Huilanshan Mafic Granulite in the Dabie Mountains and Its Zircon Trace Element Geochemistry.Science in China Series D:Earth Sciences,48(12):2081-2091.https://doi.org/10.1360/03yd0524
Huang,F.,Li,S.G.,Dong,F.,et al.,2007.Recycling of Deeply Subducted Continental Crust in the Dabie Mountains,Central China.Lithos,96(1/2):151-169.https://doi.org/10.1016/j.lithos.2006.09.019
Huang,F.,Li,S.G.,Dong,F.,et al.,2008.High-Mg Adakitic Rocks in the Dabie Orogen,Central China:Implications for Foundering Mechanism of Lower Continental Crust.Chemical Geology,255(1/2):1-13.https://doi.org/10.1016/j.chemgeo.2008.02.014
Jahn,B.M.,Wu,F.Y.,Lo,C.H.,et al.,1999.Crust-Mantle Interaction Induced by Deep Subduction of the Continental Crust:Geochemical and Sr-Nd Isotopic Evidence from Post-Collisional Mafic-Ultramafic Intrusions of the Northern Dabie Complex,Central China.Chemical Geology,157(1/2):119-146.https://doi.org/10.1016/s0009-2541(98)00197-1
Keay,S.,Lister,G.,Buick,I.,2001.The Timing of Partial Melting,Barrovian Metamorphism and Granite Intrusion in the Naxos Metamorphic Core Complex,Cyclades,Aegean Sea,Greece.Tectonophysics,342(3/4):275-312.https://doi.org/10.1016/s0040-1951(01)00168-8
Le Maitre,R.W.,Bateman,P.,Dudek,A.,et al.,1989.A Classification of Igneous Rocks and Glossary of Terms.Blackwell,Oxford
Leech,M.L.,2001.Arrested Orogenic Development:Eclogitization,Delamination,and Tectonic Collapse.Earth and Planetary Science Letters,185(1/2):149-159.https://doi.org/10.1016/s0012-821x(00)00374-5
Lei,H.C.,Xu,H.J.,2018.A Review of Ultrahigh Temperature Metamorphism.Journal of Earth Science,29(5):1167-1180.https://doi.org/10.1007/s12583-018-0846-9
Liu,Y.C.,Li,S.G.,Xu,S.T.,et al.,2005.Geochemistry and Geochronology of Eclogites from the Northern Dabie Mountains,Central China.Journal of Asian Earth Sciences,25(3):431-443.https://doi.org/10.1016/j.jseaes.2004.04.006
Ma,C.Q.,Li,Z.C.,Ehlers,C.,et al.,1998.A Post-Collisional Magmatic Plumbing System:Mesozoic Granitoid Plutons from the Dabieshan High-Pressure and Ultrahigh-Pressure Metamorphic Zone,East-Central China.Lithos,45(1/2/3/4):431-456.https://doi.org/10.1016/s0024-4937(98)00043-7
Ma,C.Q.,Yang,K.G.,Ming,H.L.,et al.,2004.The Timing of Tectonic Transition from Compression to Extension in Dabieshan:Evidence from Mesozoic Granites.Science in China Series D:Earth Sciences,47(5):453-462
Maniar,P.D.,Piccoli,P.M.,1989.Tectonic Discrimination of Granitoids.Geological Society of America Bulletin,101(5):635-643.https://doi.org/10.1130/0016-7606(1989)101<0635:tdog>2.3.co;2
Middlemost,E.A.K.,1994.Naming Materials in the Magma/igneous Rock System.Earth-Science Reviews,37(3/4):215-224.https://doi.org/10.1016/0012-8252(94)90029-9
Okay,A.I.,?eng?r,A.M.C.,Satir,M.,1993.Tectonics of an Ultrahigh-Pressure Metamorphic Terrane:The Dabie Shan/Tongbai Shan Orogen,China.Tectonics,12(6):1320-1334.https://doi.org/10.1029/93tc01544
Qu,W.,Liu,X.C.,Cui,J.J.,et al.,2018.40Ar/39Ar Dating of Muscovite from the Guishan Complex in the Tongbai Orogen,Central China,and Its Geological Implications.Earth Science,43(1):247-258.https://doi.org/10.3799/dqkx.2018.015(in Chinese with English Abstract)
Ratschbacher,L.,Hacker,B.R.,Calvert,A.,et al.,2003.Tectonics of the Qinling(Central China):Tectonostratigraphy,Geochronology,and Deformation History.Tectonophysics,366(1/2):1-53.https://doi.org/10.1016/s0040-1951(03)00053-2
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