英云闪长岩-奥长花岗岩-花岗闪长岩(TTG)岩石构造组合及其亚类划分
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摘要
TTG岩石构造组合(或岩类)表征洋壳俯冲作用。本文提出TTG岩类的4个亚类:(1)镁安山岩系列(MA)低压型TTG亚类,形成于非常年轻和很热的洋壳俯冲,压力≤1 500～1 600 MPa,深度≤50～60km,例如活动洋中脊俯冲的板片窗的边缘;(2)镁安山岩系列(MA)高压型TTG亚类,形成于比较年轻和较热的洋壳俯冲,压力≥1 500～1 600MPa,深度≥50～60km;(3)低镁(或非镁)安山岩系列(LMA)低压型TTG亚类,形成于洋内弧下地壳,压力≤1 500～1 600MPa,深度≤50～60km;(4)低镁(或非镁)安山岩系列(LMA)高压型TTG亚类,形成了大陆边缘弧山根带,压力≥1 500～1 600 MPa,深度≥50～60km。对TTG岩类4个亚类的研究,并结合对无TTG形成的老的冷的俯冲带洋壳和冷的弧地壳以及幔楔有无岩浆产生等方面的研究,可以重建岩浆弧的壳幔结构和热结构,进而可为与洋俯冲有关的成矿作用提供地质背景。
The TTG petrotectonic assemblage (or igneous series) characterizes subduction of oceanic crust.In this paper,we suggest four subtypes of the TTG series:(1)The magnesium andesite (MA) lower pressure subtype is formed at a subduction zone of very young oceanic crust at highest temperature,≤1500-1600 MPa pressure and≤50-60 km depth,for example,at the margins of the slab-window of the active mid-oceanic ridge subduction.(2)The magnesium andesite(MA)higher pressure subtype is formed at a subduction zone of relatively young oceanic crust at high temperature,≥1500-1600 MPa pressure and≥50-60 km depth.(3)The lower(or non)magnesium andesite (LMA) lower pressure subtype is formed at a lower crust of the intra-oceanic island arc at≤1500-1600 MPa pressure and ≤50-60 km depth.And (4) The lower (or non) magnesium andesite (LMA) higher pressure subtype is formed at the mountain root of the continental arc at≥1500-1600 MPa pressure and≥50-60 km depth.Using a combination of the four TTG assemblage subtypes and non-magma generation at the subduction zone of older oceanic crust at low temperature with or without magma generation at the mantle wedge,we may reconstruct the crust-mantle and thermal structures of the magmatic arcs and provide a geologic basis for oceanic subduction related mineralization.
The TTG petrotectonic assemblage (or igneous series) characterizes subduction of oceanic crust.In this paper,we suggest four subtypes of the TTG series:(1)The magnesium andesite (MA) lower pressure subtype is formed at a subduction zone of very young oceanic crust at highest temperature,≤1500-1600 MPa pressure and≤50-60 km depth,for example,at the margins of the slab-window of the active mid-oceanic ridge subduction.(2)The magnesium andesite(MA)higher pressure subtype is formed at a subduction zone of relatively young oceanic crust at high temperature,≥1500-1600 MPa pressure and≥50-60 km depth.(3)The lower(or non)magnesium andesite (LMA) lower pressure subtype is formed at a lower crust of the intra-oceanic island arc at≤1500-1600 MPa pressure and ≤50-60 km depth.And (4) The lower (or non) magnesium andesite (LMA) higher pressure subtype is formed at the mountain root of the continental arc at≥1500-1600 MPa pressure and≥50-60 km depth.Using a combination of the four TTG assemblage subtypes and non-magma generation at the subduction zone of older oceanic crust at low temperature with or without magma generation at the mantle wedge,we may reconstruct the crust-mantle and thermal structures of the magmatic arcs and provide a geologic basis for oceanic subduction related mineralization.
引文
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[24]MARTIN H,SMITHIES B H,RAPP R P,et al.An overview ofadakite tonalite-trondhjemite-granodiorite(TTG)and Sanukitoid:relationships and some implications for crustal evolution[J].Lithos,2005,79:1-24.
[25]张旗,钱青,翟明国,等.Sanukite(赞岐岩)的地球化学特征、成因及其地球动力的意义[J].岩石矿物学杂志,2005,24(2):117-125.
[26]SHIREY S B,HANSON G N.Mantle-derived Archeanmonzodiorites and trachyandesites[J].Nature,1984,310:222-224.
[27]邓晋福,刘翠,冯艳芳,等.高镁安山岩/闪长岩类(HMA)和镁安山岩/闪长岩类(MA):与洋俯冲作用相关的两类典型的火成岩类[J].中国地质,2010,37(4):1112-1118.
[28]MARTIN H.Theadakitic magmas:modern analogues of Archean granitoids[J].Lithos,1999,46:411-429.
[29]WYLLIE P J.Constraints imposed by experimental petrology on possible and impossible magma sources and products[J].Philosophical Transactions of the Royal Society of London.Series A,Mathematical and Physical Sciences,1984,A310:439-456.
[30]邓晋福,冯艳芳,狄永军,等.岩浆弧火成岩构造组合与洋陆转换[J].地质论评,2015,61(3);473-484.
[31]邱家骧.岩浆岩岩石学[M].北京:地质出版社,1985:318-319.
[32]MIDDLEMOST E A K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37:215-224.
[33]PECCERILLO A,TAYLOR S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58:63-81.
[34]RAPP R P,肖龙,ICU N S M.中国东部富钾埃达克岩成因的实验约束[J].岩石学报,2002,18(3):293-302.
[35]WILSON M.Igneous petrogenesis[M].London:Vniwin Hyman,1989:1-466.
[36]KAY R W.Aleutian magnesian andesites:melts from subducted Pacific Ocean crust[J].Journal of Volcanology and Geothermal Research,1978(4):117-132.
[2]PITCHER W S.Granite type and tectonic environment[M]∥HSU K J.Mountain building processes.London:Academic Press,1983:19-40.
[3]BROWN G C.Calc-alkaline intrusive rocks:their diversity,evolution and relation to volcanic arcs[M]∥THORPE R S.Andesites.New York:John Wiley&Sons,1982:437-461.
[4]MANIARD P D,PICCOLI P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101:635-643.
[5]邓晋福,罗照华,苏尚国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004:1-381.
[6]JAHN B M,GLIKSON A Y,PEUCAT J J,et al.REE geochemistry and isotopic data of Archean silicic volcanics and granitoids from the Pilbara Block,Western Australia:implications for the early crustal evolution[J].Geochimica et Cosmochimica Acta,1981,45:1633-1652.
[7]O CONNOR J T.A classification for quartz-rich igneous rocks based on feldspar ratios[J].U.S.Geological Survey Professional Paper,1965,525-B:B79-B84.
[8]LE MAITRE R W.A Classification of igneous rocks and glossary of terms[M].Oxford:Wiley-Blackwell,1989:1-193.
[9]LE MAITRE H W.Igneous rocks:a classification and glossary of terms[M].2nd ed.Cambridge:Cambridge University Press,2002:1-236.
[10]冯艳芳,邓晋福,肖庆辉,等.TTG岩类的识别:讨论与建议[J].高校地质学报,2011,17(3):406-414.
[11]邓晋福,刘翠,冯艳芳,等.关于火成岩常用图解的正确使用:讨论与建议[J].地质论评,2015,61(4):717-734.
[12]BARKER F.Trondhjemites,dacites,and related rocks[M].Amsterdam:Elsevier Scientific Publishing Company,1979.
[13]MOYEN J F,MARTIN H.Forty years of TTG research[J].Lithos,2012,148:312-336.
[14]HELZ R T.Phase relations of basalts in their melting range at PH2O=5Kb,PartⅡ,welt compositions[J].Journal of Petrology,1976,17:139-193.
[15]RAPP R P,WATSON E B,MILLER C F.Partial melting of amphibolite/eclogite and origin of Archean trondhjemites and tonalites[J].Precambrian Research,1991,51:1-25.
[16]JOHANNES W,HOLTZ F.Petrogenesis and experimental petrology of granitic rocks[M].Berlin:Springer,1996:1-335.
[17]DEFANT M J,DRUMMOND M S.Derivation of some modern arc magmas by melting of young subducted lithosphere[J].Nature,1990,347:662-665.
[18]ATHERTON M P,PRTFORD N.Generation of sodiumrich magmas from newly underplated basaltic crust[J].Nature,1993,362:144-146.
[19]PRTFORD N,ATHERTON M P.Na-rich partial melts from newly underplated basalticcrust:The Cordillera Blanca batholith,Peru[J].Journal of Petrology,1996,37(6):1491-1521.
[20]张旗,钱青,王二七,等.燕山中晚期的“中国东部高原”:埃达克岩的启示[J].地质科学,2001,36:248-255.
[21]张旗,王焰,钱青,等.中国东部燕山期埃达克岩的特征及其构造成矿的意义[J].岩石学报,2001,17:236-244.
[22]DRUMMOND M S,DEFAUT M J.A model for trondhjemite-tonalite-dacite genesis and crustal growth via slabmelting:Archean to modern comparisons[J].Journal of Geophysical Research Atmospheres,1990,95(B13):21503-21521.
[23]邓晋福,冯艳芳,狄永军,等.中国侵入岩大地构造[M].北京:地质出版社,2017:1-583.
[24]MARTIN H,SMITHIES B H,RAPP R P,et al.An overview ofadakite tonalite-trondhjemite-granodiorite(TTG)and Sanukitoid:relationships and some implications for crustal evolution[J].Lithos,2005,79:1-24.
[25]张旗,钱青,翟明国,等.Sanukite(赞岐岩)的地球化学特征、成因及其地球动力的意义[J].岩石矿物学杂志,2005,24(2):117-125.
[26]SHIREY S B,HANSON G N.Mantle-derived Archeanmonzodiorites and trachyandesites[J].Nature,1984,310:222-224.
[27]邓晋福,刘翠,冯艳芳,等.高镁安山岩/闪长岩类(HMA)和镁安山岩/闪长岩类(MA):与洋俯冲作用相关的两类典型的火成岩类[J].中国地质,2010,37(4):1112-1118.
[28]MARTIN H.Theadakitic magmas:modern analogues of Archean granitoids[J].Lithos,1999,46:411-429.
[29]WYLLIE P J.Constraints imposed by experimental petrology on possible and impossible magma sources and products[J].Philosophical Transactions of the Royal Society of London.Series A,Mathematical and Physical Sciences,1984,A310:439-456.
[30]邓晋福,冯艳芳,狄永军,等.岩浆弧火成岩构造组合与洋陆转换[J].地质论评,2015,61(3);473-484.
[31]邱家骧.岩浆岩岩石学[M].北京:地质出版社,1985:318-319.
[32]MIDDLEMOST E A K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37:215-224.
[33]PECCERILLO A,TAYLOR S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58:63-81.
[34]RAPP R P,肖龙,ICU N S M.中国东部富钾埃达克岩成因的实验约束[J].岩石学报,2002,18(3):293-302.
[35]WILSON M.Igneous petrogenesis[M].London:Vniwin Hyman,1989:1-466.
[36]KAY R W.Aleutian magnesian andesites:melts from subducted Pacific Ocean crust[J].Journal of Volcanology and Geothermal Research,1978(4):117-132.