赞皇杂岩中白虎庄片麻岩成因及时代研究
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摘要
赞皇杂岩中的白虎庄片麻岩位于邢台县西,主要由角山黑云斜长片麻岩及黑云斜长片麻岩组成。岩石具有高硅、高铝、富钠、贫钾及低K2O/Na2O比值的特点,Mg#指数为33.37～45.63。该片麻岩具有中等-强烈程度的稀土元素分异,具有轻微的铕负异常。其富集Rb、Ba等大离子亲石元素,亏损Nb、等高场强元素。属于高铝的TTG,推断其成因与俯冲洋壳熔融有关。LA-ICP-MS锆石U-Pb定年结果表明,白虎庄片麻岩形成于2 545.5±7.9 Ma,属新太古代中晚期产物。
Baihuzhuang gneiss of ZanHuang complex is located in the west of Xingtai county, mainly consists of hornblende black mica plagioclase gneiss and black mica plagioclase gneiss. The gneiss are characterized by high silicon, aluminum and sodium, poor potassium and low ratio of K2O/Na2 O, and the Mg# index was 33.37 to 45.63. It has medium-strong rare earth element differentiation and slight europium negative anomaly. For the gneiss belongs to high aluminum's TTG that enrich lithophile elements Rb and loss high field strength element Nb, Ta, the article speculate it formed by subduction and melting of oceanic crust. LA-ICP-MS zircon U-Pb age data indicate that the rocks formed within the range of 2545.5±7.9 Ma, consequently, their formation age is restricted at middle and late Neoarchean.
Baihuzhuang gneiss of ZanHuang complex is located in the west of Xingtai county, mainly consists of hornblende black mica plagioclase gneiss and black mica plagioclase gneiss. The gneiss are characterized by high silicon, aluminum and sodium, poor potassium and low ratio of K2O/Na2 O, and the Mg# index was 33.37 to 45.63. It has medium-strong rare earth element differentiation and slight europium negative anomaly. For the gneiss belongs to high aluminum's TTG that enrich lithophile elements Rb and loss high field strength element Nb, Ta, the article speculate it formed by subduction and melting of oceanic crust. LA-ICP-MS zircon U-Pb age data indicate that the rocks formed within the range of 2545.5±7.9 Ma, consequently, their formation age is restricted at middle and late Neoarchean.
引文
[1]张瑞英,张成立,孙勇.华北克拉通~2.5Ga地壳再造事件:来自中条山TTG质片麻岩的证据[J].岩石学报,2013,29(7):2265-2280.
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[14]LUDWIG K R.User’s Manual for Isoplot/Ex,Version 3.00:AGeochronological Toolkit for Microsoft Excel[M].Berkeley Geochronology Center:Special Publication,2003:1-70.
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[16]BELOUSOVA E A,RIFFOIN W L,UZANNE Y,et al.Igneous zircon:trace element composition as an indicator of source rock type[J].Contributions to Mineralogy&Petrology,2002,143(5):602-622.
[17]HOSKIN P W O,SCHALTEGGER U.The composition of zircon and igneous and metamorphic petrogenesis[J].Reviews in Mineralogy and Geochemistry,2003,53(1):27-62.
[18]SHAW D M.Development of the early continental crust.Part1.Use of trace element distribution coefficient models for the Proto-Archean crust[J].Canadian Journal of Earth Sciences,1972,9:1,577-1,595.
[19]WRIGHT J B.A simple alkalinity ratio and its application to questions of non-orogenic granite gneiss[J].Geological Magazine,1969,106(4):370-384.
[20]RAPP R P,SHIMIZU N,NORMAN M D,et al.Reaction between slab-derived melts and peridotite in the mantle wedge:experimental constraints at 3.8Gpa[J].Chemical Geology,1999,160(4):335-356.
[21]SMITHIES R H.The Archean tonalite-trondhjemitegranodiorite(TTG)series is not an analogue of Cenozoic adakite[J].Earth&Planetary Science Letters,2000,182(1):115-125.
[2]雷世和,胡胜军.河北阜平、赞皇变质核杂岩构造及成因模式[J].河北地质学院学报,1994,17(1):54-64.
[3]牛树银,陈路,许传诗,等.太行山区地壳演化及成矿规律[M].北京:地震出版社,1994:55-106.
[4]牛树银.太行山阜平、赞皇隆起是中新生代变质核杂岩[J].地质科技情报,1994,13(2):15-16.
[5]牛树银,许传诗,国连杰,等.太行山变质核杂岩的特征及成因探讨[J].河北地质学院学报,1994,17(1):43-53.
[6]杨崇辉,杜利林,任留东,等.赞皇杂岩中太古宙末期菅等钾质花岗岩的成因及动力学背景[J].地学前缘,2011,18(2):62-78.
[7]王岳军,范蔚茗,郭峰,等.赞皇变质穹窿黑云母40Ar/39Ar年代学研究及其对构造热事件的约束[J].岩石学报,2003,19(1):131-140.
[8]耿元生,沈其韩,任留东.华北克拉通晚太古代末-古元古代初的岩浆事件及构造热体制[J].岩石学报,2010,26(7):1945-1966.
[9]MARTIN H.Archean grey gneisses and the genesis of the continental crust[J].Archean Crustal Evolution,1994,11:205-259.
[10]路增龙,宋会侠,杜利林,等.华北克拉通阜平杂岩中~2.7Ga TTG片麻岩的厘定及其地质意义[J].地学前缘,2014,30(10):2872-2884.
[11]BLACK L P,KAMO S L,ALLEN C M,et al.TEMORA 1:a new zircon standard for Phanerozoic U-Pb geochronology[J].Chemical Geology,2003,200(1-2):155-170.
[12]JACKSON S E,PEARSON N J,GRIFFIN W L,et al.The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chemical Geology,2004,211(1-2):47-69.
[13]LIU D Y,WILDE S A,WAN Y S,et al.Combined U-Pb,hafnium and oxygen isotope analysis of zircons from meta-igneous rocks in the Southern North China craton reveal multiple events in the Late Mesoarchean-Early Neoarchean[J].Chemical Geology,2009,261(1-2):140-154.
[14]LUDWIG K R.User’s Manual for Isoplot/Ex,Version 3.00:AGeochronological Toolkit for Microsoft Excel[M].Berkeley Geochronology Center:Special Publication,2003:1-70.
[15]ANDERSEN T.Correction of common lead in U-Pb analyses that do not report 204Pb[J].Chemical Geology,2002,192(1-2):59-79.
[16]BELOUSOVA E A,RIFFOIN W L,UZANNE Y,et al.Igneous zircon:trace element composition as an indicator of source rock type[J].Contributions to Mineralogy&Petrology,2002,143(5):602-622.
[17]HOSKIN P W O,SCHALTEGGER U.The composition of zircon and igneous and metamorphic petrogenesis[J].Reviews in Mineralogy and Geochemistry,2003,53(1):27-62.
[18]SHAW D M.Development of the early continental crust.Part1.Use of trace element distribution coefficient models for the Proto-Archean crust[J].Canadian Journal of Earth Sciences,1972,9:1,577-1,595.
[19]WRIGHT J B.A simple alkalinity ratio and its application to questions of non-orogenic granite gneiss[J].Geological Magazine,1969,106(4):370-384.
[20]RAPP R P,SHIMIZU N,NORMAN M D,et al.Reaction between slab-derived melts and peridotite in the mantle wedge:experimental constraints at 3.8Gpa[J].Chemical Geology,1999,160(4):335-356.
[21]SMITHIES R H.The Archean tonalite-trondhjemitegranodiorite(TTG)series is not an analogue of Cenozoic adakite[J].Earth&Planetary Science Letters,2000,182(1):115-125.