东天山大草滩北镁铁超镁铁岩锆石U-Pb年龄、地球化学特征及其地质意义
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摘要
为探讨新疆北天山古生代大地构造格架及其演化,对吐哈盆地南缘古生代天窗新发现的大草滩北镁铁-超镁铁岩进行了地球化学和U-Pb定年研究。结果表明,该镁铁质-超镁铁质岩石由玄武岩、辉长岩、辉橄岩、辉石岩和蛇纹石化超基性岩组成。其轻稀土富集、重稀土相对亏损,有较弱的同化混染作用,玄武岩具有岛弧火山岩和洋中脊火山岩双重特性,可能与康古尔蛇绿岩一样产于弧后盆地环境的蛇绿岩(SSZ型)。本次研究获得的辉长岩的LA-ICP-MS锆石~(206)Pb/U~(238)年龄为416.5±4 Ma,为晚志留世,说明古亚洲洋初始主碰撞持续到志留纪晚期。
In order to address the Paleozoic tectonic framework and its evolution history of the North Tianshan in Xinjiang,we performed geochemical and U-Pb isotope dating studies of mafic-ultramafic complex in the new discovered of Paleozoic Dacaotan scuttle on the southern margin of the Tuha Basin. The mafic-ultramafic complex consist of basalts,gabbro,augite peridotite,pyroxenite and serpentinized ultramafic rocks. REE patterns of rocks are characterized by the enrichment of LREE and depleted of HREE,indicative of slight assimilation. Basalts have the geochemical compositions similar to the mixture of island arc and mid-ocean ridge magmas,suggesting that the Dacaotanbei mafic-ultramafic complex may have been formed in back-arc basin environment( SSZ),similar to the Kanguer ophiolite. The LA-ICP-MS zircon ~(206) Pb /~(238) U ratios of gabbro yielded a age of 416. 5±4 Ma( n = 24,MSWD = 0. 57). The geochemical feature and zircon U-Pb ages of the complex suggest that the Paleo Asian Ocean initial collision continued into the Late Silurian.
In order to address the Paleozoic tectonic framework and its evolution history of the North Tianshan in Xinjiang,we performed geochemical and U-Pb isotope dating studies of mafic-ultramafic complex in the new discovered of Paleozoic Dacaotan scuttle on the southern margin of the Tuha Basin. The mafic-ultramafic complex consist of basalts,gabbro,augite peridotite,pyroxenite and serpentinized ultramafic rocks. REE patterns of rocks are characterized by the enrichment of LREE and depleted of HREE,indicative of slight assimilation. Basalts have the geochemical compositions similar to the mixture of island arc and mid-ocean ridge magmas,suggesting that the Dacaotanbei mafic-ultramafic complex may have been formed in back-arc basin environment( SSZ),similar to the Kanguer ophiolite. The LA-ICP-MS zircon ~(206) Pb /~(238) U ratios of gabbro yielded a age of 416. 5±4 Ma( n = 24,MSWD = 0. 57). The geochemical feature and zircon U-Pb ages of the complex suggest that the Paleo Asian Ocean initial collision continued into the Late Silurian.
引文
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Elliott T,Plank T,Zindler A,White W,Bourdon B.1997.Elementstransport from slab to volcanic front at the Mariana arc.Journal of Geophysical Research,102(B7):14991-15019
Hall R.2002.Cenozoic geological anf plate tectonic evolution of SE Asia and the SW Pacific:Computer.based reconstructions,model and animations.J.Asian Earth.,20:353-431
Hofmann W.1986.Chemical differentiation of the earth:The relationship between mantle,continental crust,and oceanic crust.Earth and Planetary Science Letters,90(3):297-314
Hoskin P W O,Black L P.2000.Metamorphic zircon formation by solidstate recrystallization of protolith igneous zircon.Journal of Metamorphic Geology,18(4):423-439
Pearce J A.1983.The role of sub-continental lithosphere in magma genesis at destructive plate margins.In:Hawkesworth C J and Norry M J(eds).Continental basalts and mantle xenoliths.Nantwich Shiva:Academic Press,230~24
Sun S S,McD onough W F.1989.Chemical and isotopic systematic of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D,Norry M J,eds.Magmatism in the Ocean Basins.Geological Society,London,Special Publications,42(1):313-345
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Windley BF,Kroner A,Guo J.2002.Neoproterozoic to Paleozoic geology of the Altai orogen,NW China:New zircon age data and tectonic evolution.Journal Geology,110:719-739
曹福根,涂其军,张晓梅.2006.哈尔里克山早古生代岩浆弧的初步确定-来自塔水河一带花岗质岩体SHRMP锆石U-Pb测年的证据.地质通报,25(8):923-927
邓晋福,刘翠,冯艳芳,肖庆辉,狄永军,苏尚国,赵国春,段培新,戴蒙.2015.关于火成岩常用图解的正确使用:讨论与建议.地质论评,61(4):718-732
董连慧,朱志新,屈迅,王克卓,赵同阳.2010.新疆蛇绿岩带的分布、特征及研究新进展.岩石学报,26(10):2894-2904
辜平阳,李永军,张兵.2009.西准达尔布特蛇绿岩中辉长岩LA-ICP-MS锆石U-Pb测年.岩石学报,25(6):1364-1372
郭华春,钟莉,李丽群.2006.哈尔里克口门子地区石英闪长岩SHRMP锆石U-Pb测年及其地质意义.地质通报,25(8):928-931
韩宝福,季建清,宋彪,陈立辉,李宗怀.2004.新疆喀拉通克和黄山东含铜镍矿镁铁-超镁铁杂岩体的SHRIMP锆石U-Pb年龄及其地质意义.科学通报,49(22):2324-2328
赖绍聪,刘池阳.2003.青藏高原安多岛弧型蛇绿岩地球化学及成因.岩石学报,19(4):675-682
李华芹,陈富文,路发远.2004a.东天山东天山三岔口铜矿区岩体SHRMP U-Pb年代学及锶同位素地球化学特征研究.地球学报,25(2):191-195
李文铅,马华东,王冉,王核,夏斌.2008.东天山康古尔塔格蛇绿岩SHRIMP年龄、Nd-Sr同位素特征及构造意义.岩石学报,24(4):773-780
李文铅,王冉,王核,夏斌.2006.“吐哈天窗”卡拉塔格岩体的地球化学和岩石成因.中国地质,33(3):559-565
刘成军,裴先治,李佐臣,李瑞保,裴磊,陈国超,陈有炘,徐通,张永明.2015.天水细尾子沟镁铁-超镁铁质岩锆石LA-ICP-MS、U-Pb年龄、岩石地球化学特征及其构造意义.地质论评,61(3):548-558
马瑞士,舒良树,孙家齐.1997.东天山构造演化与成矿.北京:地质出版社,1-202
毛亚晶,秦克章,唐冬梅,薛胜超,冯宏业,田野.2014.东天山岩浆铜镍硫化物矿床的多期次岩浆侵位与成矿作用---以黄山铜镍矿床为例.岩石学报,30(6):1575-1594
秦克章,方同辉,王书来,王旭东.2001.吐哈盆地南缘古生代“天窗”卡拉塔格铜金矿化区的发现及其成矿潜力.中国地质,28(3):16-23
秦克章,唐冬梅,苏本勋,毛亚晶,薛胜超,田野,孙赫,三金柱,肖庆华,邓刚.2012.北疆二叠纪镁铁-超镁铁岩铜、镍矿床的构造背景、岩体类型、基本特征、相对剥蚀程度、含矿性评价标志及成矿潜力分析.西北地质,45(4):83-116
芮宗瑶,王龙生,王义天.2002.东天山土屋和延东斑岩铜矿床时代讨论.矿床地质,21(1):16-21
唐红峰,苏玉平,刘丛强.2007.新疆北部卡拉麦里斜长花岗岩的锆石U-Pb年龄及其构造意义.大地构造与成矿学,31(1):110-117
唐俊华,顾连兴,郑远川,方同辉.2006.东天山卡拉塔格钠质火山岩岩石学、地球化学成因.岩石学报,22(5):1150-1166
王京彬,徐新.2006.新疆北部后碰撞构造演化与成矿.地质学报,80(1):23-31
吴华,李华芹,陈富文,路发远.2005.东天山哈密地区赤湖钼铜矿区斜长花岗斑岩SHRMP U-Pb年龄.地质通报,25(5):549-552
夏明哲,姜常义,钱壮志,夏昭德,汪帮耀,孙涛.2010.新疆东天山黄山东岩体岩石地球化学特征与岩石成因.岩石学报,26(8):2413-2430
肖文交,韩春明,袁超,陈汉林,孙敏,林寿发,厉子龙,毛启贵,张继恩,孙枢,李继亮.2006.新疆北部石炭纪-二叠纪独特的构造-成矿作用:对古亚洲洋构造域南部大地构造演化的制约.岩石学报,22(5):1062-1076.
新疆地质调查院,2013.新疆维吾尔自治区成矿地质背景研究成果报告
许继峰,于学元,李献华.2000.秦岭勉略带中鞍子山蛇绿岩的地球化学:古洋壳的证据及意义.地质学报,74(1):39-50.
张瑞,孙涛,张江江,姜超,何克,王柱命.2012.新疆二红洼镁铁-超镁铁质杂岩体地球化学特征.西北地质,45(增刊):89-92
张元元,郭召杰.2010.准噶尔北部蛇绿岩形成时限新证据及其东、西准噶尔蛇绿岩的对比研究.岩石学报,26(2):422-430
张志诚,郭召杰,宋彪.2009.阿尔金山北缘蛇绿混杂岩中辉长岩锆石SHRIMP U-Pb定年及其地质意义.岩石学报,25(3):568-576
Campbell I H,Griffiths R W.1993.The evolution of the mantle’s chemical structure.Lithos,30(3-4):389-399
Elliott T,Plank T,Zindler A,White W,Bourdon B.1997.Elementstransport from slab to volcanic front at the Mariana arc.Journal of Geophysical Research,102(B7):14991-15019
Hall R.2002.Cenozoic geological anf plate tectonic evolution of SE Asia and the SW Pacific:Computer.based reconstructions,model and animations.J.Asian Earth.,20:353-431
Hofmann W.1986.Chemical differentiation of the earth:The relationship between mantle,continental crust,and oceanic crust.Earth and Planetary Science Letters,90(3):297-314
Hoskin P W O,Black L P.2000.Metamorphic zircon formation by solidstate recrystallization of protolith igneous zircon.Journal of Metamorphic Geology,18(4):423-439
Pearce J A.1983.The role of sub-continental lithosphere in magma genesis at destructive plate margins.In:Hawkesworth C J and Norry M J(eds).Continental basalts and mantle xenoliths.Nantwich Shiva:Academic Press,230~24
Sun S S,McD onough W F.1989.Chemical and isotopic systematic of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D,Norry M J,eds.Magmatism in the Ocean Basins.Geological Society,London,Special Publications,42(1):313-345
Wilson M.1989.Igneous petrogenesis.London:Unwin Hyman,1-466
Windley BF,Kroner A,Guo J.2002.Neoproterozoic to Paleozoic geology of the Altai orogen,NW China:New zircon age data and tectonic evolution.Journal Geology,110:719-739
曹福根,涂其军,张晓梅.2006.哈尔里克山早古生代岩浆弧的初步确定-来自塔水河一带花岗质岩体SHRMP锆石U-Pb测年的证据.地质通报,25(8):923-927
邓晋福,刘翠,冯艳芳,肖庆辉,狄永军,苏尚国,赵国春,段培新,戴蒙.2015.关于火成岩常用图解的正确使用:讨论与建议.地质论评,61(4):718-732
董连慧,朱志新,屈迅,王克卓,赵同阳.2010.新疆蛇绿岩带的分布、特征及研究新进展.岩石学报,26(10):2894-2904
辜平阳,李永军,张兵.2009.西准达尔布特蛇绿岩中辉长岩LA-ICP-MS锆石U-Pb测年.岩石学报,25(6):1364-1372
郭华春,钟莉,李丽群.2006.哈尔里克口门子地区石英闪长岩SHRMP锆石U-Pb测年及其地质意义.地质通报,25(8):928-931
韩宝福,季建清,宋彪,陈立辉,李宗怀.2004.新疆喀拉通克和黄山东含铜镍矿镁铁-超镁铁杂岩体的SHRIMP锆石U-Pb年龄及其地质意义.科学通报,49(22):2324-2328
赖绍聪,刘池阳.2003.青藏高原安多岛弧型蛇绿岩地球化学及成因.岩石学报,19(4):675-682
李华芹,陈富文,路发远.2004a.东天山东天山三岔口铜矿区岩体SHRMP U-Pb年代学及锶同位素地球化学特征研究.地球学报,25(2):191-195
李文铅,马华东,王冉,王核,夏斌.2008.东天山康古尔塔格蛇绿岩SHRIMP年龄、Nd-Sr同位素特征及构造意义.岩石学报,24(4):773-780
李文铅,王冉,王核,夏斌.2006.“吐哈天窗”卡拉塔格岩体的地球化学和岩石成因.中国地质,33(3):559-565
刘成军,裴先治,李佐臣,李瑞保,裴磊,陈国超,陈有炘,徐通,张永明.2015.天水细尾子沟镁铁-超镁铁质岩锆石LA-ICP-MS、U-Pb年龄、岩石地球化学特征及其构造意义.地质论评,61(3):548-558
马瑞士,舒良树,孙家齐.1997.东天山构造演化与成矿.北京:地质出版社,1-202
毛亚晶,秦克章,唐冬梅,薛胜超,冯宏业,田野.2014.东天山岩浆铜镍硫化物矿床的多期次岩浆侵位与成矿作用---以黄山铜镍矿床为例.岩石学报,30(6):1575-1594
秦克章,方同辉,王书来,王旭东.2001.吐哈盆地南缘古生代“天窗”卡拉塔格铜金矿化区的发现及其成矿潜力.中国地质,28(3):16-23
秦克章,唐冬梅,苏本勋,毛亚晶,薛胜超,田野,孙赫,三金柱,肖庆华,邓刚.2012.北疆二叠纪镁铁-超镁铁岩铜、镍矿床的构造背景、岩体类型、基本特征、相对剥蚀程度、含矿性评价标志及成矿潜力分析.西北地质,45(4):83-116
芮宗瑶,王龙生,王义天.2002.东天山土屋和延东斑岩铜矿床时代讨论.矿床地质,21(1):16-21
唐红峰,苏玉平,刘丛强.2007.新疆北部卡拉麦里斜长花岗岩的锆石U-Pb年龄及其构造意义.大地构造与成矿学,31(1):110-117
唐俊华,顾连兴,郑远川,方同辉.2006.东天山卡拉塔格钠质火山岩岩石学、地球化学成因.岩石学报,22(5):1150-1166
王京彬,徐新.2006.新疆北部后碰撞构造演化与成矿.地质学报,80(1):23-31
吴华,李华芹,陈富文,路发远.2005.东天山哈密地区赤湖钼铜矿区斜长花岗斑岩SHRMP U-Pb年龄.地质通报,25(5):549-552
夏明哲,姜常义,钱壮志,夏昭德,汪帮耀,孙涛.2010.新疆东天山黄山东岩体岩石地球化学特征与岩石成因.岩石学报,26(8):2413-2430
肖文交,韩春明,袁超,陈汉林,孙敏,林寿发,厉子龙,毛启贵,张继恩,孙枢,李继亮.2006.新疆北部石炭纪-二叠纪独特的构造-成矿作用:对古亚洲洋构造域南部大地构造演化的制约.岩石学报,22(5):1062-1076.
新疆地质调查院,2013.新疆维吾尔自治区成矿地质背景研究成果报告
许继峰,于学元,李献华.2000.秦岭勉略带中鞍子山蛇绿岩的地球化学:古洋壳的证据及意义.地质学报,74(1):39-50.
张瑞,孙涛,张江江,姜超,何克,王柱命.2012.新疆二红洼镁铁-超镁铁质杂岩体地球化学特征.西北地质,45(增刊):89-92
张元元,郭召杰.2010.准噶尔北部蛇绿岩形成时限新证据及其东、西准噶尔蛇绿岩的对比研究.岩石学报,26(2):422-430
张志诚,郭召杰,宋彪.2009.阿尔金山北缘蛇绿混杂岩中辉长岩锆石SHRIMP U-Pb定年及其地质意义.岩石学报,25(3):568-576