甘肃龙首山东段小口子镁铁-超镁铁质岩体岩石学、地球化学及年代学研究
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摘要
阿拉善地块南缘龙首山地区以产出新元古代的金川铜镍硫化物矿床而著名,围绕金川矿床外围寻找铜镍矿一直备受关注。小口子镁铁-超镁铁质岩体位于龙首山东段,主要由蛇纹岩、单辉橄榄岩、橄榄辉石岩组成,岩体中局部发现了星点状硫化物,硫化物由黄铁矿、黄铜矿组成,没有发现铜镍矿体,仅有部分磁铁矿化,前人研究认为小口子岩体可能是金川铜镍矿床同期的岩浆事件产物。本次研究通过岩石地球化学研究显示,小口子岩体镁铁比值为5.31~8.74,高于一般赋存铜镍矿岩体的镁铁比值。样品球粒陨石标准化的稀土元素配分曲线为平坦型,稀土元素总量低,暗示岩石具有橄榄石堆晶特征;Sr,Nd同位素研究显示:ε_(Nd)(t)=6.09~7.77,指示岩浆源区为亏损型地幔特征;微量元素比值与同位素模拟计算结果指示母岩浆经历了微弱的中上地壳物质混染。岩体中单颗粒锆石U-Pb年龄为284.4±3.5Ma,结合区域地质对比,小口子镁铁-超镁铁质岩体的形成背景可能与古亚洲洋的闭合或俯冲之后的伸展作用相关。
Longshou mountains at the southern margin of Alxa block are famous for hosting the Neopaleozoic Jinchuan Cu-Ni sulfide deposit,prospecting for Cu-Ni sulfide deposits surrounding the Jinchuan ore deposit has long received much attention.The Xiaokouzi mafic-ultramafic intrusions,located in the eastern segment of Longshou Moutnrain,consist mainly of serpentine rock,augite peridotite,olivine pyroxenite.Star-shaped sulfide can be found locally.Sulfide contains pyrite and chalcopyrite,and no Ni-and Cu mineralization but parital mgnetitization were found in orebodies.The previous study suggests that the Xiaokouzi intrusions were likely the product of the same magma event with the Jinchuan mafic-ultramafic intrusions.The litho-geochemical analysis in this study shows that the intrusions have fairly high MgO/FeOT values with m/f=5.31~8.74,which is higher than that of average Ni-bearing intrusions.The chondrite-normalized REE diagrams and primitive-mantle normalized trace elements diagram of the samples display a flat distribution pattern with low total REEs content,indicating olivine accumulation in the intrusions.Sr and Nd isotopic study yieldsε_(Nd)(t)values of 6.09~7.77,indicating the magma source is characterized by depleted mantle.Trace element ratios and modeling results also suggest that parental magma experienced weak contamination of middle-upper crust.Single zircon U-Pb age of augite peridotite from the intrusions is 284.4±3.5Ma.Compared with regional geology,the Permian igneous rocks may be related to the closure of the Paleo-Asian Ocean,or an extensional regime after subduction.
Longshou mountains at the southern margin of Alxa block are famous for hosting the Neopaleozoic Jinchuan Cu-Ni sulfide deposit,prospecting for Cu-Ni sulfide deposits surrounding the Jinchuan ore deposit has long received much attention.The Xiaokouzi mafic-ultramafic intrusions,located in the eastern segment of Longshou Moutnrain,consist mainly of serpentine rock,augite peridotite,olivine pyroxenite.Star-shaped sulfide can be found locally.Sulfide contains pyrite and chalcopyrite,and no Ni-and Cu mineralization but parital mgnetitization were found in orebodies.The previous study suggests that the Xiaokouzi intrusions were likely the product of the same magma event with the Jinchuan mafic-ultramafic intrusions.The litho-geochemical analysis in this study shows that the intrusions have fairly high MgO/FeOT values with m/f=5.31~8.74,which is higher than that of average Ni-bearing intrusions.The chondrite-normalized REE diagrams and primitive-mantle normalized trace elements diagram of the samples display a flat distribution pattern with low total REEs content,indicating olivine accumulation in the intrusions.Sr and Nd isotopic study yieldsε_(Nd)(t)values of 6.09~7.77,indicating the magma source is characterized by depleted mantle.Trace element ratios and modeling results also suggest that parental magma experienced weak contamination of middle-upper crust.Single zircon U-Pb age of augite peridotite from the intrusions is 284.4±3.5Ma.Compared with regional geology,the Permian igneous rocks may be related to the closure of the Paleo-Asian Ocean,or an extensional regime after subduction.
引文
Deng Jinfu,Feng Yanfang,Di Yongjun,Liu Cui,Xiao Qinghui,Su Shangguo,Zhao Guochun,Meng Fei,Che Rufeng.2016.The intrusive spatial-temporal evolutional framework in the PaleoAsian Tectonic Domain.Geological Review.61(6):1211~1224(in Chinese whit English abstract).
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Geng Yuansheng,Zhou Xiwen.2010.Early Neoproterozoic granite events in Alax area of Inner Mongolia and their geological significance:evidence from geochronology.Acta Petorlogica Et Mineralogica,29(006):779~795(in Chinese whit English abstract).
Jian Ping,Liu Dunyi,Kr9ner A,Windley B F,Shi Yuruo,Zhang Fuqin,Shi Guanghai,Miao Laicheng,Zhang Wei,Zhang Qi,Zhang Liqiao,Ren Jishun.2008.Time scale of an early to midPaleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt,Inner Mongolia of China:implications for continental growth.Lithos,101:233~259.
Jian Ping,Liu Dunyi,Kr9ner A,Windley B F,Shi Yuruo,Zhang Wei,Zhang Fuqin,Miao Laicheng,Zhang Liqiao,Tomurhuu D.2010.Evolution of a Permian intraoceanic arc-trench system in the Solonker suture zone,Central Asian Orogenic Belt,China and Mongolia.Lithos,118:169~190.
Jiao Jiangang,Yan Haiqing,Qian Zhuangzhi,Liu Ruiping,Li Jingjing.2006.Geochemical chracteristics of typical maficultramafic rocks in Longshou Mountains.Mineral Petrol,26:(1)49~56(in Chinese whit English abstract).
Jiao Jiangang,Tang Zhongli,Yan Haiqing,Liu Minwu,Sun Tao,Xu Gang,Duan Jun.2012.Magmatic mass balance and metallogenic process of Jinchuan Cu-Ni sulfide deposit.Mineral Deposits,31(6):1135~1148(in Chinese whit English abstract).
Li Jinyi,Zhang Jin,Yang Tiannan,Li Yaping,Sun Guihua,Zhu Zhixin,Wang Lijia.2009.Crustal tectonic division and evolution of the southern part of the North Asian Orogenic Region and its adjacent areas.Journal of Jilin University(Earth Science Edition),39(4):584~605(in Chinese whit English abstract).
Li Jinyi,Zhang Jin,Qu Junfeng.2012.Amalgamation of North China with Alxa Block in the Late of Early Paleozoic:Evidence from sedmentary sequences in the Niushou Mountain,Ningxia Hui Autonomous Region,NW China.Geological Review,02:208~214(in Chinese whit English abstract).
Li Jinyi,Zhang Jin,Liu Jianfeng,Qu Junfeng,Li Yaping,Sun Guihua,Zhu Zhixin,Feng Qianwen,Wang Lijia,Zhang Xiaowei.2014.Major deformation systems in the mainland of China.Earth Science Frontiers,21(3):226~245(in Chinese whit English abstract).
Li Junjian.2006.Regional Metallogenic System of Alashan Block in Inner Monolia Autonomous Region.A dissertation submitted to China University of Geosciences(Beijing)for Doctor Degree(in Chinese whit English abstract).
Li Pengwu,Gao Rui,Guan Ye,Li Qiusheng.2009.The closure time of the Paleo-Asian Ocean and the Paleo-Tethys Ocean:implication for the tectonic cause of the End-Permian Mass Extinction.Journal of Jilin University(Earth Science Edition),39(3):521~527(in Chinese whit English abstract).
Li Wenyuan,Tang Zhongli,Guo Zhouping,Wang wei.2004.Petrogenetic epoch and geochemical characteristics of maficultramafic rocks on the southern margin of Alxa massif in northern China.Acta Petorlogica Et Mineralogica,23(2):117~126(in Chinese whit English abstract).
Li Xianhua,Su Li,Song Biao,Liu Dunyi.2004.SHRIMP zircon U-Pb age and its geological significance of the Jinchuan ultramafic intrusion.Chinese Science Bulletin,49(4):401~402(in Chinese whitout English abstract).
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Wu Yuanbao,Zheng Yongfei.2004.Genetic mineralogy of zircon and its constraints on the interpretation of U-Pb age.Chinese Science Bulletin,49(16):1589~1604(in Chinese whitout English abstract).
Xiao Wenjiao,Windly B F,Allen M B,Han Chunming.2013.Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage.Gondwana Research,23:1316~1341.
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Zhang Xiaohui,Zhang Hongfu,Tang Yanjie,Wilde S A,Hu Zhaochu.2008.Geochemistry of permian bimodal volcanic rocks from central Inner Mongolia,North China:Implication for tectonic setting and Phanerozoic continental growth in Central Asian Orogenic Belt.Chemical Geology,249:262~281.
Zhang Shuanhong,Zhao Yan,Song Biao,Wu Huaichun.2007.Carboniferous granitic plutons from the northern margin of the North China block:implications for a late Palaeozoic active continental margin.Journal of the Geological Society,164:451~463
Zhang Shuanhong,Zhao Yue,Kr9ner A,Liu Xiaoming,Xie Liewen,Chen Fukun.2009.Early Permian plutons from the northern North China block:constraints on continental arc evolution and convergent margin magmatism related to the Central Asian Orogenic Belt.International Journal of Earth Sciences,98:1441~1467.
Zheng Rongguo,Wu Tairan,Zhang Wen,Xu Cao,Meng Qingpeng,Zhang Zhaoyu.2014.Late Paleozoic subduction system in the northern margin of the Alxa block,Altaids:Geochronological and geochemical evidences from ophiolites.Gondwana Research,25:842~858.
Zheng Rongguo,Wu Tairan,Xiao Wenjiao,Meng Qingpeng,Zhang Wen.2016.Geochronology geochemistry and tectonic implications of the Shuangjizi composite pluton in the northern Beishan.Acta Geologica Sinica,90(11):3153~3172(in Chinese whitout English abstract).
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Huang Jiqing,Jen Chishun,Jiang Chunfa,Chang Chihmeng,Xu Zhiqin.1977.An outline of the tectonic characteristics of China.Acta Geologica Sinica,02:117~135(in Chinese whit English abstract).
Geng Yuansheng,Zhou Xiwen.2010.Early Neoproterozoic granite events in Alax area of Inner Mongolia and their geological significance:evidence from geochronology.Acta Petorlogica Et Mineralogica,29(006):779~795(in Chinese whit English abstract).
Jian Ping,Liu Dunyi,Kr9ner A,Windley B F,Shi Yuruo,Zhang Fuqin,Shi Guanghai,Miao Laicheng,Zhang Wei,Zhang Qi,Zhang Liqiao,Ren Jishun.2008.Time scale of an early to midPaleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt,Inner Mongolia of China:implications for continental growth.Lithos,101:233~259.
Jian Ping,Liu Dunyi,Kr9ner A,Windley B F,Shi Yuruo,Zhang Wei,Zhang Fuqin,Miao Laicheng,Zhang Liqiao,Tomurhuu D.2010.Evolution of a Permian intraoceanic arc-trench system in the Solonker suture zone,Central Asian Orogenic Belt,China and Mongolia.Lithos,118:169~190.
Jiao Jiangang,Yan Haiqing,Qian Zhuangzhi,Liu Ruiping,Li Jingjing.2006.Geochemical chracteristics of typical maficultramafic rocks in Longshou Mountains.Mineral Petrol,26:(1)49~56(in Chinese whit English abstract).
Jiao Jiangang,Tang Zhongli,Yan Haiqing,Liu Minwu,Sun Tao,Xu Gang,Duan Jun.2012.Magmatic mass balance and metallogenic process of Jinchuan Cu-Ni sulfide deposit.Mineral Deposits,31(6):1135~1148(in Chinese whit English abstract).
Li Jinyi,Zhang Jin,Yang Tiannan,Li Yaping,Sun Guihua,Zhu Zhixin,Wang Lijia.2009.Crustal tectonic division and evolution of the southern part of the North Asian Orogenic Region and its adjacent areas.Journal of Jilin University(Earth Science Edition),39(4):584~605(in Chinese whit English abstract).
Li Jinyi,Zhang Jin,Qu Junfeng.2012.Amalgamation of North China with Alxa Block in the Late of Early Paleozoic:Evidence from sedmentary sequences in the Niushou Mountain,Ningxia Hui Autonomous Region,NW China.Geological Review,02:208~214(in Chinese whit English abstract).
Li Jinyi,Zhang Jin,Liu Jianfeng,Qu Junfeng,Li Yaping,Sun Guihua,Zhu Zhixin,Feng Qianwen,Wang Lijia,Zhang Xiaowei.2014.Major deformation systems in the mainland of China.Earth Science Frontiers,21(3):226~245(in Chinese whit English abstract).
Li Junjian.2006.Regional Metallogenic System of Alashan Block in Inner Monolia Autonomous Region.A dissertation submitted to China University of Geosciences(Beijing)for Doctor Degree(in Chinese whit English abstract).
Li Pengwu,Gao Rui,Guan Ye,Li Qiusheng.2009.The closure time of the Paleo-Asian Ocean and the Paleo-Tethys Ocean:implication for the tectonic cause of the End-Permian Mass Extinction.Journal of Jilin University(Earth Science Edition),39(3):521~527(in Chinese whit English abstract).
Li Wenyuan,Tang Zhongli,Guo Zhouping,Wang wei.2004.Petrogenetic epoch and geochemical characteristics of maficultramafic rocks on the southern margin of Alxa massif in northern China.Acta Petorlogica Et Mineralogica,23(2):117~126(in Chinese whit English abstract).
Li Xianhua,Su Li,Song Biao,Liu Dunyi.2004.SHRIMP zircon U-Pb age and its geological significance of the Jinchuan ultramafic intrusion.Chinese Science Bulletin,49(4):401~402(in Chinese whitout English abstract).
McDonough,W W,and Sun,S S,1995.The composition of the Earth.Chemical Geology,120:223~253.
Rudnick R L and Gao S.2003.Composition of the continental crust.In:Rudnick RL(ed.)Treatise on geochemistry,the crust.Elsevier,Amsterdam.3:1~64.
Song Biao,Zhang Yuhai,Wan Yusheng,Jian Ping.2002.Mount making and proeedure of the SHRIMP dating.Geological Review,S1:26~30(in Chinese whit English abstract).
Stanley C R,Russell J K.1989.Petrologic hypothesis testing with Pearce element ratio diagrams:derivation of diagram axes.Contributions to Mineralogy&Petrology,103(1):78~89.
Sun S S and McDonough W F.1989 Chemical and isotopic systematics of oceanic basalts;Implications for mantle composition and processes.Geological Society London:Special Publication,42(1):313~345.
Xiao Xuchang,Tang Yaoqing,Feng Yimin,Zhu Baoqing,Li Jinyi,Zhao Min.1992.Tectonics evolution of northern XinJiang and Its adjacent regions.Beijing:Geological Publishing House.1~169(in Chinese without English abstract).
Wang K and Plant T.2002.A mantle melting profile across the basin andrange,SW USA.Journal of Geophysical Research,107,doi:10.1029/2001JB000209
Wang Tingyin,Zhang Mingjie,Wang Jinrong,Gao Junping.1998.The characteristics and tectonic implications of the thrust belt in Eugerwusu,CHINA.Scientia Geologica Sinica,33(4):385~394(in Chinese whit English abstract).
Wu Yuanbao,Zheng Yongfei.2004.Genetic mineralogy of zircon and its constraints on the interpretation of U-Pb age.Chinese Science Bulletin,49(16):1589~1604(in Chinese whitout English abstract).
Xiao Wenjiao,Windly B F,Allen M B,Han Chunming.2013.Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage.Gondwana Research,23:1316~1341.
Tang Zhongli,Li Wenyuan.1995.Mineralization model and geology of the Jinchuan Ni-Cu sulfide deposit bearing PGE.Beijing:Geological Publishing House.1~209(in Chinese without English abstract).
Ye Ke.2015.Geochemistry of Late Paleozoic Igneous rocks from Yabulaishan area in Alxa and its tectonic implications.Adissertation submitted to China University of Geosciences(Beijing)for Master Degree(in Chinese whit English abstract).
Zhang Xiaohui,Zhang Hongfu,Tang Yanjie,Wilde S A,Hu Zhaochu.2008.Geochemistry of permian bimodal volcanic rocks from central Inner Mongolia,North China:Implication for tectonic setting and Phanerozoic continental growth in Central Asian Orogenic Belt.Chemical Geology,249:262~281.
Zhang Shuanhong,Zhao Yan,Song Biao,Wu Huaichun.2007.Carboniferous granitic plutons from the northern margin of the North China block:implications for a late Palaeozoic active continental margin.Journal of the Geological Society,164:451~463
Zhang Shuanhong,Zhao Yue,Kr9ner A,Liu Xiaoming,Xie Liewen,Chen Fukun.2009.Early Permian plutons from the northern North China block:constraints on continental arc evolution and convergent margin magmatism related to the Central Asian Orogenic Belt.International Journal of Earth Sciences,98:1441~1467.
Zheng Rongguo,Wu Tairan,Zhang Wen,Xu Cao,Meng Qingpeng,Zhang Zhaoyu.2014.Late Paleozoic subduction system in the northern margin of the Alxa block,Altaids:Geochronological and geochemical evidences from ophiolites.Gondwana Research,25:842~858.
Zheng Rongguo,Wu Tairan,Xiao Wenjiao,Meng Qingpeng,Zhang Wen.2016.Geochronology geochemistry and tectonic implications of the Shuangjizi composite pluton in the northern Beishan.Acta Geologica Sinica,90(11):3153~3172(in Chinese whitout English abstract).
Zhou Liangren.1996.The Beidashan rift belt in the Alxa block.Northwestern Geology,4(1):1~11.(in Chinese whitout English abstract).
Zindler A and Hart S R.1986.Chemical geodynamics:Annual Review of Earth&Planetary Sciences.14:493~571.
邓晋福,冯艳芳,狄永军,刘翠,肖庆辉,苏尚国,赵国春,孟斐,车如风.2016.古亚洲构造域侵入岩时-空演化框架.地质论评,61(6):1211~1224.
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