Detrital Zircon LA-ICP-MS U-Pb Geochronology of Metasedimentary Rocksfrom Li'eryu Petrofabric of South Liaohe Group in Huanghuadian-Suzigou Area, East Liaoning and Its Geological Significance
-
摘要: 辽东黄花甸-苏子沟地区南辽河岩群里尔峪岩组主要为一套原岩以含硼火山-沉积夹陆源碎屑岩的变质岩石组成，岩石类型主要为长英质粒状岩石（浅粒岩-变粒岩组合）。前人长期在该活动带上进行深入的研究，在区域构造、地球化学、同位素年代学研究以及构造演化等方面积累了大量资料，取得了一系列重要进展。但是，有关其里尔峪岩组的变质作用时代、沉积时代、源区特征以及辽河岩群乃至整个胶-辽-吉活动带的大地构造属性和形成的构造演化过程长期以来存在着裂谷开启-闭合模式、弧-陆碰撞模式和陆-陆碰撞模式的争论。笔者旨在辽东黄花甸-苏子沟等地区开展1：5万区域地质调查的基础上，选择黄花甸-苏子沟地区里尔峪岩组的透闪斜长变粒岩、电气黑云二长变粒岩和黑云斜长变粒岩为重点研究对象。通过锆石阴极发光图像特征和锆石U-Pb （LA-ICP-MS，下同）年代学测试，综合限定研究区里尔峪岩组变质沉积岩的物质来源、原岩形成时代及变质变形时代。测试结果显示锆石阴极发光图像具核-边结构，核部具振荡环带，Th/U值较高（Th/U=0.02~2.37），表明部分锆石来源于岩浆，少部分锆石来源于后期的变质变形作用。年代学分析结果表明，这些碎屑锆石U-Pb年龄分别得到~1 900 Ma、~2 182 Ma和~2 511 Ma三个主峰值以及~2 030 Ma、~2 076 Ma、~2 110 Ma、~1 900 Ma、~2 312 Ma、~2 452 Ma、~2 715 Ma、~2 796 Ma、~3 537 Ma等8个次峰值。综合前人研究成果，研究区里尔峪岩组的原岩形成时代应晚于~2 030 Ma，其沉积作用应发生于2 030~1 946 Ma；峰期变质作用年龄为~1 900 Ma，变质变形作用应发生于1 837~1 946 Ma。该区里尔峪岩组碎屑锆石的年龄频谱特征显示，其沉积物主要来源于胶-辽-吉活动带内2 000~2 200 Ma的中酸性岩浆岩、辽吉花岗岩及辽河岩群火山岩，少部分来自北侧龙岗地块的太古宙结晶基底。胶-辽-吉活动带至少还存在一期2 000~2 100 Ma的中酸性岩浆活动。
-
关键词:
- 里尔峪岩组 /
- 碎屑锆石 /
- LA-ICP-MS U-Pb年代学 /
- 地质意义 /
- 辽东黄花甸-苏子沟地区
Abstract: The Li'eryu petrofabric of South Liaohe Group mainly is a set of boron-bearing volcanic-sedimentary metamorphic rocks in Huanghuadian-Suzigou area, East Liaoning. It mainly consists of quartzo-feldspathic rocks (leptite-leptynite unit). After a long-term, depth and extensive geological study in this area, abundant of new data and interpretations of tectonic, geochemisty, isotopic geochronology and tectonic evolution have been obtained. However, their metamorphic time, depositional time, protolith characteristics and tectonic evolution are still controversy. The debates focus on three major tectonic evolution models of Liaohe group and all Jiaodong-Liaoning-Jilin mobile belt in North China Craton, which include continent-arc collision, continent-continent (terranes) collision and rifting models. The Di-Pl leptynite, Tou-Bt two-feldspathic leptynite and Bt-Pl leptynite from Huanghuadian-Suzigou area have been selected as the research objects in this paper, based on the new data about 1:50000 regional geological survey of East Liaoning. The Cathodoluminescence (CL) imaging and LA-ICP-MS U-Pb zircon data are linked to unravel the origin, depositional and metamorphic time of the Li'eryu petrofabric. Zircon grains separated from three samples show core-rim structure. The zircon cores show oscillatory zoning and have high Th/U ratios (Th/U=0. 02~2.37), suggests that some zircons were derived from magma and a small number of zircons from metamorphic deformation in the late stage. The chronological results show that these detrital zircon U-Pb ages respectively have three main peaks at~1 900 Ma,~2 182 Ma and~2 511 Ma, as well as eight secondary peaks at~2 030 Ma,~2 076 Ma,~2 110 Ma,~1 900 Ma,~2 312 Ma,~2 452 Ma,~2 715 Ma,~2 796 Ma and~3 537 Ma. Integrated predecessors' research results, the formation time of original rock from Li'eryu petrofabric should be later than~2 030 Ma; its sedimentation happened at 2 030~1 46Ma; Peak metamorphism age was~1 900Ma and the metamorphic deformation occurred at 1 837~1 946 Ma. The detrital zircon age spectrum characteristics of Li'eryu petrofabric show that the sediments mainly soured from acidic magmatic rocks, Liaoji granite and volcanic rocks of Liaohe group in Jiaodong-Liaoning-Jilin mobile belt with the ages of 2 000~2 200 Ma, and a few of them came from archean crystalline basement of Longgang terrane at its north side. At least, an intermediate-acid magmatic activity with an age of 2 000~2 100 Ma was occurred in the Jiaodong-Liaoning-Jilin mobile belt. -
-
刘福来,刘平华,王舫等.胶-辽-吉古元古代造山/活动带巨量变沉积岩系的研究进展[J].岩石学报,2015,31(10):2816-2846.
LIU Fulai,LIU Pinghua,WANG Fang,et al. Progresses and overviews of voluminous meta-sedimentary series within the Paleoproterozoic Jiao-Liao-Ji orogenic/mobile belt,North China Craton[J]. Acta Petrologica Sinica,2015,31(10):2816-2846.
姜春潮.辽吉东部前寒武纪地质[M].沈阳:辽宁科学技术出版社,1987,10-36.
JIANG Chunchao.Precambrian geology in east part of Liaoning and Jilin provinces[M].Shenyang:Liaoning Science and Technology Press,1987,10-36.
张秋生.辽东半岛早期地壳与矿[M].北京:地质出版社, 1988:57.
ZHANG Qiusheng.Early crust and mineral deposits of Liaodong Peninsula[M].Beijing:Geological Publishing House, 1988:57.
白瑾,戴凤岩.中国早前寒武纪的地壳演化[J].地球学报,1994, (Z2):73-87.
BAI Jin,DAI Fengyan.The early Precambrian crust evolution of China[J].Acta GeoscientiaSinca,1994, (Z2):73-87.
白谨,黄学光,王惠初,等.中国前寒武纪地壳演化(第2版)[M].北京:地质出版社,1996:259.
BAI Jin, HUANG Xueguang,WANG Huichu, et al.The Precambrian crustal evolution of China(2ndEdition)[M].Beijing:Geological Publishing House,1996:259.
李三忠,杨振升.胶辽地块古元古代花岗岩类型及成因[J].西北地质,1997a,43(6):21-27.
LI Sanzhong,YANG Zhensheng. Types and genesis of Palaeo proterozoic granite in the Jiao-Liao massif[J]. Northwest Geology,1997a,43 (6):21-27.
李三忠,杨振升,刘永江,等.胶辽吉地区古元古代早期花岗岩的侵位模式及其与隆滑构造的关系[J].岩石学报, 1997b,13:189-202.
LI Sanzhong, YANG Zhensheng, LIU Yongjiang, et al. Emplacement model of Palaeopro terozoic early-granite in the Jiao-Liao-Ji area and its relation to layered gravitational sliding structure[J].Acta Petrologica Sinica,1997b,13:189-202.
李三忠,刘永江,杨振升.辽吉地区古元古代造山作用的大陆动力学过程及其壳内响应[J].地球物理学报,1998,41(1):142-152.
LI Sanzhong, LIU Yongjiang, YANG Zhensheng. Intracrustral response to continental dynamic processes of the Paleoproterozoic orogeny in Liao-Ji area[J]. Acta Geophysica Sinica,1998,41(1):142-152.
李三忠,韩宗珠,刘永江,等.辽河群区域变质特征及其大陆动力学意义[J].北京:地质论评,2001,47(1):9-18.
LI Sanzhong, HAN Zhongzhu, LIU Yongjiang, et al. Continental dynamics and regional metamorphism of the Liaohe Group[J]. Geological Review,2001, 47(1):9-18.
李三忠,郝德峰,韩宗珠,等.胶辽地块古元古代构造-热演化与深部过程[J].地质学报,2003,77(3):380-404.
LI Sanzhong,HAO Defeng,HAN Zongzhu,et al.Paleo proterozoic deep processes and tecto no-thermal evolution in Jiao-Liao Massif[J].Acta Geologica Sinica,2003,77 (3):380-404.
路孝平,吴福元,林景仟,等.辽东半岛南部早前寒武纪花岗质岩浆作用的年代学格架[J].地质科学,2004,39(1):123-138.
LU Xiaoping,WU Fuyuan,LIN Jingqian,et al. Geochronological successions of the Early Precambrian granitic magmatism in southern Liaodo ng Peninsula and its constraint on tectonic evolution of the North China Craton[J].Chinese Journal of Geology,2004,39(1):123-138.
王博,何艳红,孟祥舒,等.辽宁海城地区老虎沟基性岩墙锆石U-Pb-Hf同位素、地球化学特征及其地质意义[J]. 西北地质,2017,50(2):80-94.
WANG Bo,HE Yanhong,MENG Xiangshu, et al. Petrogenesis and Tectonic Significance of Laohugou Mafic Dykes in Haicheng,Liaoning Province:Evidence from Zircon U-Pb-Hf Isotopes and Whole-rock Geochemistry[J].Northwestern Geology,2017,50(2):80-94.
王舫,刘建辉,刘超辉.辽南三家子地区南辽河群里尔峪组变沉积岩中碎屑锆石U-Pb年代学研究[J].岩石学报,2017,33(9):2785-2791.
WANG Fang,LIU Jianhui, LIU Chaohui. Detrital zircon U-Pb geochronology of metasedimentary rocks from the Li'eryu Formation of the South Liaohe Group in Sanjiazi area,the South Liaoning Province[J]. Acta Petrologica Sinica,2017,33(9):2785-2791.
孟恩,刘福来,刘平华,等.辽东半岛东北部宽甸地区南辽河群沉积时限的确定及其构造意义[J].岩石学报,2013,29(7):2465-2480.
MENG En,LIU Fulai, LIU Pinghua,et al.Depositional ages and tectonic implications for South Liao he Group from Kuan dian area in northeastern Liao dong Peninsula,Northeast China[J].Acta Petrologica Sinica,2013,29(7):2465-2480.
杨崇辉,杜利林,耿元生,等.冀东古元古代基性岩墙群的年龄及地球化学:~2.1Ga伸展及~1.8Ga变质[J].岩石学报,2017,33(9):2827-49.
YANG Chonghui,DU Lilin,GENG Yuansheng,et al.Paleoproterozoic metamafic dyke swarms in the eastern Hebei massif,the eastern North China Craton:~2. 1 Ga extension and~1. 8 Gametamorphism[J]. Acta Petrologica Sinica,2017,33(9):2827-2849.
ZHAIM G and SANTOSH M. The early Precambrian odyssey of the North China Craton:A synoptic verview[J]. Gondwana Research, 2011,20 (1):6-25.
ZHAO G C,CAWOOD P A,LI S Z,et al. Amalgamation of the North China Craton:Key issues and discussion[J]. Precambrian Research, 2012,222-223:55-76.
LIUD Y,NUTMAN A P,COMPSTON W,et al.Remnants of>3 800Ma Crust in the Chinese Part of the Sino-Korean Craton[J].Geology,1992,20(4):339-342.
LUO Y,SUN M,ZHAO G C,et al. LAICP-MS U-Pb zircon ages of the Liaohe Group in the Eastern Block of the North China Craton:Constraints on the evolution of the Jiao-Liao-Ji Belt[J].Precambrian Research,2004,134(3-4):349-371.
LUO Y,SUN M,ZHAO G C,et al. A comparison of U-Pb and Hf isotopic compositions of detrital zircons from the North and South Liaohe groups:Constraints on the evolution of the Jiao-Liao-Ji Belt,North China Craton[J]. Precambrian Research,2008,163(3-4):279-306.
LU X P,WU F Y,GUO J H,et al. Zircon U-Pb geochronological constraints on the Paleoproterozoic crustal evolution of the Eastern Block in the North China Craton[J].Precambrian Research,2006,146(3-4):138-164.
LI S Z and ZHAO G C. SHRIMP U-Pb zircon geochronology of the Liaoji granitoids:Constraints on the evolution of the Paleoproterozoic Jiao-Liao-Ji belt in the Eastern Block of the North China Craton[J].Precambrian Research,2007,158(1-2):1-16.
LIUY S,GAO S,HU Z C,et al. Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb Dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010a,51(1-2):537-571.
LIUY S,HU Z C,ZONG K Q,et al.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J].Chinese Science Bulletin,2010b,55(15):1535-1546.
LUDWIG K R. ISOPLOT 3.00:A Geochronological Toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center Special Publication, 2003.
BELOUSOVA E A,GRIFFIN W L,O'REILLY S Y,et al. Igneous zircon:Trace element composition as an indicator of source rock type[J].Contributions to Mineralogy and Petrology,2002.143 (5):602-622.
HOSKIN P W.Rare earth element chemistry of zircon and its use as a provenance indicator[J].Geology,2001,28(7):627-630.
ZHAO G C and CAWOOD P A.Precambrian geology of China[J].Precambrian Research,2012,222-223:13-54.
DUBI ŃSKAE,BYLINA P,KOZLOWSKI A,et al.U-Pb dating of serpentinization:Hydrothermal zircon from a metasomatic rodingite shell (Sudetic ophiolite,SW Poland)[J].Chemical Geology,2004,203(3-4):83-203.
TOMASCHEK F,KENNEDY A K and VILLA IM.Zircons from Syros,Cyclades,Greece-recrystallization and mobilization of zircon during high-pressure metamorphism[J].Journal of Petrology,2003,44(11):1977-2002.
-
计量
- 文章访问数: 2429
- PDF下载数: 1617
- 施引文献: 0
下载: