哀牢山构造带南段马玉花岗闪长岩地球化学特征及其锆石U-Pb年龄
|
摘要
对云南墨江县马玉花岗闪长岩进行了锆石U-Pb年龄和岩石地球化学分析。LA-ICP-MS锆石U-Pb测年显示,马玉花岗闪长岩年龄为263.6±2.4Ma,形成于晚二叠世。岩石地球化学显示,马玉花岗闪长岩SiO_2含量为59.56%～70.50%,全碱(Na_2O+K_2O)含量为5.16%～7.92%,且Na2O>K_2O;岩石富集轻稀土元素,负Eu异常明显(δEu=0.84～1.32),相对富集Sc、Hf,相对贫化Sr、Zr、Th、U。构造环境判别图解显示,马玉花岗闪长岩形成于碰撞期后板内构造环境,说明哀牢山构造带的古特提斯支洋或弧后盆地在晚二叠世(263.6±2.4Ma)已经闭合。
This study presents bulk petrogeochemistry and zircon U-Pb dating results for the Mayu granodiorite in Mojiang,Yunnan. LA-ICP-MS zircon U-Pb dating results show that the Mayu granodiorite was formed in the Late Permian period(263.6 ±2.4 Ma). The Mayu granodiorite is characterized by SiO_2 content of 59.56%～70.50%, alkali(Na_2O+K_2O)5.16%～7.92%, and Na_2O higher than K_2O. It is enriched in LREE and Sc, Hf, and depleted in Sr, Zr, Th, U, with negative Eu anomalies(δEu:0.84～1.32).According to the diagrams, the Mayu granodiorite was formed in a tectonic environment of island arc-continent or continental-arc collision,indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailaoshan tectonic belt may have been closed in the Late Permian(263.6 ± 2.4 Ma).
This study presents bulk petrogeochemistry and zircon U-Pb dating results for the Mayu granodiorite in Mojiang,Yunnan. LA-ICP-MS zircon U-Pb dating results show that the Mayu granodiorite was formed in the Late Permian period(263.6 ±2.4 Ma). The Mayu granodiorite is characterized by SiO_2 content of 59.56%～70.50%, alkali(Na_2O+K_2O)5.16%～7.92%, and Na_2O higher than K_2O. It is enriched in LREE and Sc, Hf, and depleted in Sr, Zr, Th, U, with negative Eu anomalies(δEu:0.84～1.32).According to the diagrams, the Mayu granodiorite was formed in a tectonic environment of island arc-continent or continental-arc collision,indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailaoshan tectonic belt may have been closed in the Late Permian(263.6 ± 2.4 Ma).
引文
[1]钟大赉.滇川西部古特提斯造山带[M].北京:科学出版社,1998:1-231.
[2]方维萱,胡瑞忠,谢桂青,等.云南哀牢山地区构造岩石地层单元及其构造演化[J].大地构造与成矿学,2002,26(1):28-36.
[3]Fan W M,Wang Y J,Zhang F F,et al.Permian arc-back-arc basin development along the Ailaoshan tectonic zone:Ceochemical,isotopic and geochronol evidence from the Mojiang volcanic rocks,Southwest China[J].Lithos,2010,119(3/4):553-568.
[4]云南地矿局.云南省区域地质志[M].北京:地质出版社,1990:400-450.
[5]丛柏林,吴根耀,张旗,等.中国滇西古特提斯构造带岩石大地构造演化[J].中国科学(D辑),1993,23(11):1201-1207.
[6]MetcalfeⅠ.Paleozoic and Mesozoic tectonic evolution and palaeogeography of East Asia crustal fragments:The Korean Peninsula in context[J].Gondwana Research,2006,9(1/2):24-46.
[7]Wang Y J,Zhang A M,Fan W M,et al.Petrogenesis of late Triastonic zone,southwest China,and tectonic implications for the evolution of the eastern Paleotethys geochronological and geochemical constraints[J].Lithos,2010,120(3/4):529-546.
[8]Jian P,Liu D Y,Kroner A Z,et al.Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China(1):Geochemistry of ophiolites,arc/back-arc assemblages and withinplate igneous rocks[J].Lithos,2009,113(3/4):748-766.
[9]刘俊来,唐渊,宋志杰,等.滇西哀牢山构造带:构造与演化[J].吉林大学学报(地球科学报),2011,41(5):1285-1303.
[10]张玉泉,夏斌,梁华英,等.云南大平糜棱岩化碱性花岗岩的锆石特征及其地质意义[J].高校地质学报,2004,10(3):378-384.
[11]李宝龙,季建清,付孝悦,等.滇西点苍山-哀牢山变质岩系锆石SHRIMP定年及其地质意义[J].岩石学报,2008,24(10):207-211.
[12]张旗,潘国强,李承东,等.花岗岩构造环境问题:关于花岗岩研究的思考之三[J].岩石学报,2007,23(11):2683-2698.
[13]吴福元,李献华,郑永飞,等.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,2007,23(2):185-220.
[14]王洪亮,何世平,陈隽璐,等.北秦岭西段胡店片麻状二长花岗岩LA-ICP-MS锆石U-Pb测年及其地质意义[J].中国地质,2007,34(1):17-25.
[15]赵海杰,毛景文,叶会寿,等.陕西黄龙铺地区碱性花岗斑岩及辉绿岩的年代学与地球化学:岩石成因及其构造环境示踪[J].中国地质,2010,37(1):12-27.
[16]费光春,温春齐,王成松,等.西藏墨竹工卡县洞中拉铅锌矿床花岗斑岩锆石SHRIMP U-Pb定年[J].中国地质,2010,37(2):470-476.
[17]邹光富,林仕良,李再会,等.滇西潞西邦木二长花岗岩SHRIMP锆石U-Pb年龄及其构造意义[J].中国地质,2011,38(1):77-85.
[18]董云鹏,朱炳泉,常向阳,等.哀牢山缝合带中两类火山岩地球化学特征及其构造意义[J].地球化学,2000,29(1):6-13.
[19]Jackson S E,Pearson N J,Criffin W L,et al.The application of laser ablation of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chemical Geology,2004,211(1/2):47-69.
[20]Anderson T.Correction of common lead in U-Pb analyses that do not report204Pb[J].Chemical Geology,2002,192(1/2):59-79.
[21]Ludwig K R.Squid 1.02:A user manual[M].Berkeley:Berkeley Geochronological Cener Special publication,2001:1-219.
[22]Li X H,Qi C S,Liu Y,et al.Petrogenesis of the Neoproterozoic bimodal volcanic rocks along the western margin of the Yangtze Block:New constraints from Hf isotopes and Fe/Mn rations[J].Chinese Science Bull,2005,50:2481-2486.
[23]刘颖,刘海臣,李献华.用ICP-MS准确测量岩石样品中的40余种微量元素.地球化学,1996,25(26):552-558.
[24]黎彤,饶紀龙.论化学元素在地壳及其基本构造单元中的丰度[J].地质学报,1965,45(01):82-97.
[25]Batchelor R A,Bowden P.Petrorgenetic interpretation of granitoid rock series using multicationic parameters[J].Chemistry Geology,1985,50:63-81.
[26]Pearce J A,Harris N B L,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25:956-983.
[27]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[28]刘翠,邓晋福,刘俊来,等.哀牢山构造岩浆带晚二叠世-早三叠世火山岩特征及其构造环境[J].岩石学报,2011,27(12):3599-3602.
[29]刘汇川,王岳军,蔡永丰,等.哀牢山构造带新安寨晚二叠世末期过铝质花岗岩锆石U-Pb年代学及Hf同位素组成研究[J].大地构造与成矿学,2013,37(1):87-98.
[30]Jian P,Liu D Y,Kroner A,et al.Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China(Ⅱ):Geochemistry of ophiolites,arc/back-arc assemblages and withinplate igneous rocks and generation of the Emeishan CFB province[J].Lithos,2009,113(3/4):767-784.
[31]Li G Z,Li C S,Ripley M E,et al.Geochronology,petrology and geochemistry of the Nanlinshan and Banpo mafic-ultramafic intrusions:Implications for subduction initiation in the eastern Paleo-Tethys[J].Contributions to Mineralogy and Petrology,2012,164(5):773.
[32]Zi J W,Cawood P A,Fan W M,et al.Generation of Early Indosinian enriched mantle-derived granitoid pluton in the Sanjiang Orogen(SW China)in response to closure of the PaleoTethys[J].Lithos,2012,140(5):166-182.
[2]方维萱,胡瑞忠,谢桂青,等.云南哀牢山地区构造岩石地层单元及其构造演化[J].大地构造与成矿学,2002,26(1):28-36.
[3]Fan W M,Wang Y J,Zhang F F,et al.Permian arc-back-arc basin development along the Ailaoshan tectonic zone:Ceochemical,isotopic and geochronol evidence from the Mojiang volcanic rocks,Southwest China[J].Lithos,2010,119(3/4):553-568.
[4]云南地矿局.云南省区域地质志[M].北京:地质出版社,1990:400-450.
[5]丛柏林,吴根耀,张旗,等.中国滇西古特提斯构造带岩石大地构造演化[J].中国科学(D辑),1993,23(11):1201-1207.
[6]MetcalfeⅠ.Paleozoic and Mesozoic tectonic evolution and palaeogeography of East Asia crustal fragments:The Korean Peninsula in context[J].Gondwana Research,2006,9(1/2):24-46.
[7]Wang Y J,Zhang A M,Fan W M,et al.Petrogenesis of late Triastonic zone,southwest China,and tectonic implications for the evolution of the eastern Paleotethys geochronological and geochemical constraints[J].Lithos,2010,120(3/4):529-546.
[8]Jian P,Liu D Y,Kroner A Z,et al.Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China(1):Geochemistry of ophiolites,arc/back-arc assemblages and withinplate igneous rocks[J].Lithos,2009,113(3/4):748-766.
[9]刘俊来,唐渊,宋志杰,等.滇西哀牢山构造带:构造与演化[J].吉林大学学报(地球科学报),2011,41(5):1285-1303.
[10]张玉泉,夏斌,梁华英,等.云南大平糜棱岩化碱性花岗岩的锆石特征及其地质意义[J].高校地质学报,2004,10(3):378-384.
[11]李宝龙,季建清,付孝悦,等.滇西点苍山-哀牢山变质岩系锆石SHRIMP定年及其地质意义[J].岩石学报,2008,24(10):207-211.
[12]张旗,潘国强,李承东,等.花岗岩构造环境问题:关于花岗岩研究的思考之三[J].岩石学报,2007,23(11):2683-2698.
[13]吴福元,李献华,郑永飞,等.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,2007,23(2):185-220.
[14]王洪亮,何世平,陈隽璐,等.北秦岭西段胡店片麻状二长花岗岩LA-ICP-MS锆石U-Pb测年及其地质意义[J].中国地质,2007,34(1):17-25.
[15]赵海杰,毛景文,叶会寿,等.陕西黄龙铺地区碱性花岗斑岩及辉绿岩的年代学与地球化学:岩石成因及其构造环境示踪[J].中国地质,2010,37(1):12-27.
[16]费光春,温春齐,王成松,等.西藏墨竹工卡县洞中拉铅锌矿床花岗斑岩锆石SHRIMP U-Pb定年[J].中国地质,2010,37(2):470-476.
[17]邹光富,林仕良,李再会,等.滇西潞西邦木二长花岗岩SHRIMP锆石U-Pb年龄及其构造意义[J].中国地质,2011,38(1):77-85.
[18]董云鹏,朱炳泉,常向阳,等.哀牢山缝合带中两类火山岩地球化学特征及其构造意义[J].地球化学,2000,29(1):6-13.
[19]Jackson S E,Pearson N J,Criffin W L,et al.The application of laser ablation of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chemical Geology,2004,211(1/2):47-69.
[20]Anderson T.Correction of common lead in U-Pb analyses that do not report204Pb[J].Chemical Geology,2002,192(1/2):59-79.
[21]Ludwig K R.Squid 1.02:A user manual[M].Berkeley:Berkeley Geochronological Cener Special publication,2001:1-219.
[22]Li X H,Qi C S,Liu Y,et al.Petrogenesis of the Neoproterozoic bimodal volcanic rocks along the western margin of the Yangtze Block:New constraints from Hf isotopes and Fe/Mn rations[J].Chinese Science Bull,2005,50:2481-2486.
[23]刘颖,刘海臣,李献华.用ICP-MS准确测量岩石样品中的40余种微量元素.地球化学,1996,25(26):552-558.
[24]黎彤,饶紀龙.论化学元素在地壳及其基本构造单元中的丰度[J].地质学报,1965,45(01):82-97.
[25]Batchelor R A,Bowden P.Petrorgenetic interpretation of granitoid rock series using multicationic parameters[J].Chemistry Geology,1985,50:63-81.
[26]Pearce J A,Harris N B L,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25:956-983.
[27]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[28]刘翠,邓晋福,刘俊来,等.哀牢山构造岩浆带晚二叠世-早三叠世火山岩特征及其构造环境[J].岩石学报,2011,27(12):3599-3602.
[29]刘汇川,王岳军,蔡永丰,等.哀牢山构造带新安寨晚二叠世末期过铝质花岗岩锆石U-Pb年代学及Hf同位素组成研究[J].大地构造与成矿学,2013,37(1):87-98.
[30]Jian P,Liu D Y,Kroner A,et al.Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China(Ⅱ):Geochemistry of ophiolites,arc/back-arc assemblages and withinplate igneous rocks and generation of the Emeishan CFB province[J].Lithos,2009,113(3/4):767-784.
[31]Li G Z,Li C S,Ripley M E,et al.Geochronology,petrology and geochemistry of the Nanlinshan and Banpo mafic-ultramafic intrusions:Implications for subduction initiation in the eastern Paleo-Tethys[J].Contributions to Mineralogy and Petrology,2012,164(5):773.
[32]Zi J W,Cawood P A,Fan W M,et al.Generation of Early Indosinian enriched mantle-derived granitoid pluton in the Sanjiang Orogen(SW China)in response to closure of the PaleoTethys[J].Lithos,2012,140(5):166-182.