黑龙江省海音山林场二长花岗岩的年代学特征及地质意义
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摘要
为探究黑龙江省东部海音山林场地区二长花岗岩的形成时代和地质意义,对细粒二长花岗岩开展锆石阴极发光图像和U-Pb年代学研究。结果表明,锆石形态以自形、半自形为主,主要呈粒状和柱状,韵律环带结构明显。锆石具有较高含量的U(299×10~(-6)～813×10~(-6))和Th(56×10~(-6)～351×10~(-6))值,Th/U值为0. 06～0. 55,均值为0. 35。加权平均年龄为120±1 Ma,属于早白垩世。海音山林场地区二长花岗岩形成于活动大陆边缘环境。该结果为海音山林场地区内岩浆岩的锆石年代学研究提供了参考。
This paper describes a new research into cathodoluminescence images of zircons and zircon U-Pb dating of the fine-grained monzonitic granites occurring in Haiyinshan Forest Farm,in Heilongjiang Province,with the aim of constraining its formation age and geodynamic significance. The results show that zircon exhibits euhedral-subhedral morphology,mainly in the granular and columnar form,and an obvious oscillatory-zoning characteristics; the zircon has a higher content of U( 299 × 10~(-6)-813 × 10~(-6)) value,Th( 56 × 10~(-6)-351 × 10~(-6)) value,and Th/U value of 0. 06-0. 55,with average value of 0. 35,and the weighted average age of 120 ± 1 Ma,suggesting that the monzogranite was formed in the Early Cretaceous. The study concludes that the monzo granite present in Haiyinshan Forest Farm was formed in the active continental marginal environment. The results could serve as a reference for investigating zircon geochronology of magmatic rocks in Haiyinshan Forest Farm area.
This paper describes a new research into cathodoluminescence images of zircons and zircon U-Pb dating of the fine-grained monzonitic granites occurring in Haiyinshan Forest Farm,in Heilongjiang Province,with the aim of constraining its formation age and geodynamic significance. The results show that zircon exhibits euhedral-subhedral morphology,mainly in the granular and columnar form,and an obvious oscillatory-zoning characteristics; the zircon has a higher content of U( 299 × 10~(-6)-813 × 10~(-6)) value,Th( 56 × 10~(-6)-351 × 10~(-6)) value,and Th/U value of 0. 06-0. 55,with average value of 0. 35,and the weighted average age of 120 ± 1 Ma,suggesting that the monzogranite was formed in the Early Cretaceous. The study concludes that the monzo granite present in Haiyinshan Forest Farm was formed in the active continental marginal environment. The results could serve as a reference for investigating zircon geochronology of magmatic rocks in Haiyinshan Forest Farm area.
引文
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[19]许文良,葛文春,裴福萍,等.东北地区中生代火山作用的年代学格架及其构造意义[J].矿物岩石地球化学通报,2008,27(S):286-287.
[20]裴福萍,许文良,杨德彬,等.华北克拉通东北缘岩石圈深部物质组成的不均一性:来自吉林南部中生代火山岩元素及Sr-Nd同位素地球化学的证据[J].岩石学报,2009,25(8):1962-1974.
[21] Maruyama S. Pacific-type orogeny revisited:miyashiro-type oroge-ny proposed[J]. The Island Arc,1997,6(1):91-120.
[2]李锦轶,莫申国,和政军,等.大兴安岭北段地壳左行走滑运动的时代及其中国东北及邻区中生代以来地壳构造演化重建的制约[J].地学前缘,2004,11(3):157-168.
[3] Wu F Y,Lin J Q,Wilde S A,et al. Nature and significance ofthe Early Cretaceous giant igneous event in Eastern China[J].Earth and Planetary Science Letters,2005,233:103-119.
[4] Wu F Y,Walker R J,Yang Y H,et al. The chemical-temporal evo-lution of lithospheric mantle underlying the North China Craton[J].Geochimica et Cosmochimica Acta,2006,70(19):5013-5034.
[5]殷长建,彭玉鲸,靳克.中国东北东部中生代火山活动与泛太平洋板块[J].中国区域地质,2000,19(3):303-311.
[6] Wu F Y,Sun D Y,Ge W C,et al. Geochronology of the Phanero-zoic granitoids in northeastern China[J]. Journal of Asian EarthSciences,2011,41(1):1-30.
[7]胥嘉,邢德和,杨浩,等.黑龙江虎林岩体的锆石U-Pb年龄及地质意义[J].世界地质,2012:31(4):631-637.
[8] Wu F Y,Yang J H,Lo C H,et al. The Heilongjiang Group:aJurassic accretionary complex in the Jiamusi Massif at the westernPacific margin of northeastern China[J]. Island Arc,2007,16(1):156-172.
[9]黑龙江省地质矿产局.黑龙江省区域地质志[M].北京:地质出版社,1993:1-734.
[10]袁洪林,吴福元,高山,等.东北地区新生代侵入体的锆石激光探针U-Pb与稀土元素成分分析[J].科学通报,2003,48(14):1511-1520.
[11] Yuan H L,Gao S,Liu X,et al. Accurate U-Pb age and trace el-ement determinations of ziron by laer ablation-inductively coupledplasma-mass spectrometry[J]. Geostandards and GeoanalyticalResearch,2004,28(3):353-370.
[12] Liu Y S,Gao S,Hu Z C,et al. Continental and oceanic crustrecycling-induced melt-peridotite interactions in the Trans-NorthChina Orogen:U-Pb dating,Hf isotopes and trace elements inzircons from mantle xenoliths[J]. Journal of Petrology,2010,51(1/2):537-571.
[13] Liu Y S,Hu Z C,Gao S,et al. In situ analysis of major andtrace elements anhydrous minerals by LA-ICP-MS without apply-ing an internal standard[J]. Chemical Geology,2008,257(1/2):34-43.
[14] Ludwig K R. User’s manual for Isoplot 3. 00:a geochronologicaltoolkit for Microsoft Excel[M]. Berkeley:Berkeley Geochronol-ogy Center Special Publication,2003:70.
[15]程瑞玉,吴福元,葛文春,等.黑龙江省东部饶河杂岩的就位时代与东北东部中生代构造演化[J].岩石学报,2006,22:353-376.
[16]商宇航,王键,李红光,等.黑龙江东部海音山花岗闪长岩年龄、岩石成因及构造背景[J].世界地质,2017,36(4):1053-1064.
[17]阎国瀚,牟保磊,许保良,等.燕辽—阴山三叠纪碱性侵入岩年代学和Sr,Nd,Pb同位素特征及意义[J].中国科学(D辑),2000,30(4):383-387.
[18]赵越,徐刚,张栓宏,等.燕山运动与东亚构造体质的转变[J].地学前缘,2004,11(3):319-329.
[19]许文良,葛文春,裴福萍,等.东北地区中生代火山作用的年代学格架及其构造意义[J].矿物岩石地球化学通报,2008,27(S):286-287.
[20]裴福萍,许文良,杨德彬,等.华北克拉通东北缘岩石圈深部物质组成的不均一性:来自吉林南部中生代火山岩元素及Sr-Nd同位素地球化学的证据[J].岩石学报,2009,25(8):1962-1974.
[21] Maruyama S. Pacific-type orogeny revisited:miyashiro-type oroge-ny proposed[J]. The Island Arc,1997,6(1):91-120.
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