夏日哈木矿区早泥盆世镁铁质岩墙群的年代学特征及地质意义
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摘要
为厘定夏日哈木矿区幔源岩浆活动的时限和成岩构造环境,对该矿区镁铁质岩墙群开展岩相学和锆石U-Pb年代学研究。结果表明,该套镁铁质岩墙群以细粒辉长岩为主,结晶侵位年龄为415. 7±1. 6 Ma,平均标准权重偏差为0. 16,属早泥盆世,形成于造山后伸展的构造环境,其形成可能与碰撞拼贴后俯冲板片的断离作用有关。晚志留世—早泥盆世时期,东昆仑地区发生了强烈的幔源岩浆活动,为岩浆铜镍硫化物矿床的形成提供了优越的成矿地质条件。
This paper introduces a new petrographical and zircon U-Pb chronologic study on the mafic dyke swarms in Xiarihamu ore district in an attempt to constrain the formation time of mantle derived magma and the tectonic setting for the mafic dyke swarms. The research concludes that mafic dyke swarms consisting dominantly of fine-grained gabbros,with the crystallization and emplacement age of415. 7 + 1. 6 Ma( MSWD 0. 16) are classified as Early Devonian,indicating that the swarms were formed in post-orogenic extensional tectonic environment——the formation possibly associated with the break-off of the subduction slab following collision and collage; and the occurrence of strong mantle-derived magmatism in the eastern Kunlun area during the Late Silurian-Early Devonian has provided favorable metallogenic geological conditions for the formation of magmatic copper-nickel sulfide deposits.
This paper introduces a new petrographical and zircon U-Pb chronologic study on the mafic dyke swarms in Xiarihamu ore district in an attempt to constrain the formation time of mantle derived magma and the tectonic setting for the mafic dyke swarms. The research concludes that mafic dyke swarms consisting dominantly of fine-grained gabbros,with the crystallization and emplacement age of415. 7 + 1. 6 Ma( MSWD 0. 16) are classified as Early Devonian,indicating that the swarms were formed in post-orogenic extensional tectonic environment——the formation possibly associated with the break-off of the subduction slab following collision and collage; and the occurrence of strong mantle-derived magmatism in the eastern Kunlun area during the Late Silurian-Early Devonian has provided favorable metallogenic geological conditions for the formation of magmatic copper-nickel sulfide deposits.
引文
[1]罗照华,魏阳,辛后田,等.造山后脉岩组合的岩石成因———对岩石圈拆沉作用的约束[J].岩石学报,2006,22(6):1672-1684.
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[10]姜常义,凌锦兰,周伟,等.东昆仑夏日哈木镁铁质-超镁铁质岩体岩石成因与拉张型岛弧背景[J].岩石学报,2015,31(4):1117-1136.
[11]王冠,孙丰月,李碧乐,等.东昆仑夏日哈木铜镍矿镁铁质-超镁铁质岩体岩相学、锆石U-Pb年代学、地球化学及其构造意义[J].地学前缘,2014,21(6):381-401.
[12]侯可军,李延河,田有荣. LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,2009,28(4):481-492.
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[14] Ludwig K R. User’s manual for isoplot 3. 00:a geochronologicaltoolkit for Microsoft Excel[M]. Berkeley:Geochronology Cen-ter,2003:1-70.
[15] Belousova E A,Griffin W L,O’Reilly S Y,et al. Igneous zir-con:trace element composition as an indicator of source rock type[J]. Contributions to Mineralogy and Petrology,2002,143(5):602-622.
[16] Hoskin P W O,Schaltegger U. The composition of zircon and ig-neous and metamorphic petrogenesis[J]. Reviews in Mineralogyand Geochemistry,2003,53(1):27-62.
[17]孙丰月,陈国华,迟效国,等.新疆—青海东昆仑成矿带成矿规律和找矿方向综合研究报告[R].长春:吉林大学地质调查研究院,2003.
[18]曹世泰,刘晓康,马永胜,等.祁漫塔格地区早志留世侵入岩的发现及其地质意义[J].青海科技,2011(5):26-30.
[19]陈能松,何蕾,孙敏,等.东昆仑造山带早古生代变质峰期和逆冲构造变形年代的精确限定[J].科学通报,2002,47(8):628-631.
[20] Meng F C,Zhang J X,Cui M H. Discovery of Early Paleozoic eclo-gite from the East Kunlun,Western China and its tectonic signifi-cance[J]. Gondwana Research,2013,23(2):825-836.
[21] Song X Y,Yi J N,Chen L M,et al. The giant Xiarihamu Ni-Cosulfide deposit in the East Kunlun Orogenic Belt,Northern TibetPlateau,China[J]. Economic Geology,2016,111:29-55.
[22] Li L,Sun F Y,Li B L,et al. Geochronology,geochemistry andSr-Nd-Pb-Hf isotopes of No. l complex from the Shitoukengde Ni-Cu sulfide deposit in the Eastern Kunlun Orogen,western China:implications for the magmatic source,geodynamic setting andgenesis[J]. Acta Geologica Sinica(English Edition),2018,92(1):106-126.
[23]王冠.东昆仑造山带镍矿成矿作用研究[D].长春:吉林大学,2014.
[24]刘彬,马昌前,张金阳,等.东昆仑造山带东段早泥盆世侵入岩的成因及其对早古生代造山作用的指示[J].岩石学报,2012,28(6):1785-1807.
[25] Xin W,Sun F Y,Li L,et al. The Wulonggou metaluminous A2-type granites in the Eastern Kunlun Orogenic Belt,NW China:re-juvenation of subduction-related felsic crust and implications forpost-collision extension[J]. Lithos,2018,312/313:108-127.
[26]王冠,孙丰月,李碧乐,等.东昆仑夏日哈木矿区早泥盆世正长花岗岩锆石U-Pb年代学、地球化学及其动力学意义[J].大地构造与成矿学,2013,34(4):685-697.
[2] French J E,Heaman L M. Precise U-Pb dating of Paleoproterozoicmafic dyke swarms of the Dharwar Craton,India:Implications forthe existence of the Neoarchean Supercraton Sclavia[J]. Precam-brian Research,2010,183(3):416-441.
[3] Khan T,Murata M,Karim T,et al. A Cretaceous dike swarmprovides evidence of a spreading axis in the back-arc basin of theKohistan paleo-island arc,northwestern Himalaya,Pakistan[J].Journal of Asian Earth Sciences,2007,29(2/3):350-360.
[4] Mir A R,Alvi S H,Balaram V. Geochemistry of mafic dikes inthe Singhbhum Orissa craton:implications for subduction-relatedmetasomatism of the mantle beneath the eastern Indian craton[J].International Geology Review,2010,52(1):79-94.
[5]罗照华,柯珊,曹永清,等.东昆仑印支晚期幔源岩浆活动[J].地质通报,2002,21(6):292-297.
[6]莫宣学,罗照华,邓晋福,等.东昆仑造山带花岗岩及地壳生长[J].高校地质学报,2007,13(3):403-414.
[7]熊富浩,马昌前,张金阳,等.东昆仑造山带早中生代镁铁质岩墙群LA-ICP-MS锆石U-Pb定年、元素和Sr-Nd-Hf同位素地球化学[J].岩石学报,2011,27(11):3350-3364.
[8]菅坤坤,魏燕霞,施彬,等.东昆仑造山带中灶火地区早中生代镁铁质岩墙群的成因及地质意义[J].中国地质,2015,42(5):1457-1470.
[9]李世金,孙丰月,高永旺,等.小岩体成大矿理论指导与实践———青海东昆仑夏日哈木铜镍矿找矿突破的启示及意义[J].西北地质,2012,45(4):185-191.
[10]姜常义,凌锦兰,周伟,等.东昆仑夏日哈木镁铁质-超镁铁质岩体岩石成因与拉张型岛弧背景[J].岩石学报,2015,31(4):1117-1136.
[11]王冠,孙丰月,李碧乐,等.东昆仑夏日哈木铜镍矿镁铁质-超镁铁质岩体岩相学、锆石U-Pb年代学、地球化学及其构造意义[J].地学前缘,2014,21(6):381-401.
[12]侯可军,李延河,田有荣. LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,2009,28(4):481-492.
[13] Andersen T. Correction of common lead in U-Pb analyses that do notreport 204Pb[J]. Chemical Geology,2002,192(1/2):59-79.
[14] Ludwig K R. User’s manual for isoplot 3. 00:a geochronologicaltoolkit for Microsoft Excel[M]. Berkeley:Geochronology Cen-ter,2003:1-70.
[15] Belousova E A,Griffin W L,O’Reilly S Y,et al. Igneous zir-con:trace element composition as an indicator of source rock type[J]. Contributions to Mineralogy and Petrology,2002,143(5):602-622.
[16] Hoskin P W O,Schaltegger U. The composition of zircon and ig-neous and metamorphic petrogenesis[J]. Reviews in Mineralogyand Geochemistry,2003,53(1):27-62.
[17]孙丰月,陈国华,迟效国,等.新疆—青海东昆仑成矿带成矿规律和找矿方向综合研究报告[R].长春:吉林大学地质调查研究院,2003.
[18]曹世泰,刘晓康,马永胜,等.祁漫塔格地区早志留世侵入岩的发现及其地质意义[J].青海科技,2011(5):26-30.
[19]陈能松,何蕾,孙敏,等.东昆仑造山带早古生代变质峰期和逆冲构造变形年代的精确限定[J].科学通报,2002,47(8):628-631.
[20] Meng F C,Zhang J X,Cui M H. Discovery of Early Paleozoic eclo-gite from the East Kunlun,Western China and its tectonic signifi-cance[J]. Gondwana Research,2013,23(2):825-836.
[21] Song X Y,Yi J N,Chen L M,et al. The giant Xiarihamu Ni-Cosulfide deposit in the East Kunlun Orogenic Belt,Northern TibetPlateau,China[J]. Economic Geology,2016,111:29-55.
[22] Li L,Sun F Y,Li B L,et al. Geochronology,geochemistry andSr-Nd-Pb-Hf isotopes of No. l complex from the Shitoukengde Ni-Cu sulfide deposit in the Eastern Kunlun Orogen,western China:implications for the magmatic source,geodynamic setting andgenesis[J]. Acta Geologica Sinica(English Edition),2018,92(1):106-126.
[23]王冠.东昆仑造山带镍矿成矿作用研究[D].长春:吉林大学,2014.
[24]刘彬,马昌前,张金阳,等.东昆仑造山带东段早泥盆世侵入岩的成因及其对早古生代造山作用的指示[J].岩石学报,2012,28(6):1785-1807.
[25] Xin W,Sun F Y,Li L,et al. The Wulonggou metaluminous A2-type granites in the Eastern Kunlun Orogenic Belt,NW China:re-juvenation of subduction-related felsic crust and implications forpost-collision extension[J]. Lithos,2018,312/313:108-127.
[26]王冠,孙丰月,李碧乐,等.东昆仑夏日哈木矿区早泥盆世正长花岗岩锆石U-Pb年代学、地球化学及其动力学意义[J].大地构造与成矿学,2013,34(4):685-697.
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