黑龙江宝清地区早古生代花岗岩锆石U-Pb年龄及岩石地球化学特征
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摘要
对黑龙江宝清地区七一林场正长花岗岩岩体、干涸沟口二长花岗岩进行了详细的地球化学分析和U-Pb锆石测年,结果表明,正长花岗岩与二长花岗岩的形成年龄分别为523.3±2.4Ma和523.3±2.3Ma,属于早寒武世。地球化学的研究显示,岩石具有准铝质-过铝质钙碱性碱性和高分异I型花岗岩的特点,高硅、高铝、富碱。属于轻稀土元素富集、重稀土元素亏损型;δEu=0.38~1.73,平均值为1.05,根据Eu的正负异常,将宝清地区的花岗岩分为2类,正Eu异常型花岗岩和负Eu异常型花岗岩。富集大离子亲石元素(LILE)Rb、K,亏损高场强元素(HFSE)Nb、Ta、P、Ti。结合区域构造背景与年代学特征,在早古代以前佳木斯-兴凯地块可能属于同一个大陆——冈瓦纳大陆,在泛非运动主峰期之后,由于陆块的碰撞,形成大量的早古生代花岗质岩石。
Detailed geochemical analysis and U-Pb zircon dating were carried out for Qiyilinchang syenogranite and Ganhegoukou monzonitic granite in Baoqing area, Heilongjiang Province. The results show that the ages of the syenogranite and monzonitic granite are 523.3±2.4 Ma and 523.3±2.3 Ma respectively, implying early Cambrian. Petrogeochemical studies show that they have the features of quasi aluminous peraluminous calc alkaline and high differentiation I-type granite with high silicon, high aluminum and rich alkali. They belong to the type of LREE enrichment and HREE depletion. δEu=0.38~1.73,averaging 1.05. According to positive and negative Eu anomalies, the granites in Baoqing area are divided into positive Eu anomaly granite and negative anomaly granite.They are enriched in large ion rock elements(LILE) Rb and K, and depleted in high field strength elements(HFSE) Nb, Ta, P and Ti. Combined with regional tectonic background and chronology, the authors hold that, before early Proterozoic, Jiamusi-Xingkai massif might have belonged to the same continent of Gondwana and then, after the peak period of the Pan African movement, due to the collision of continental blocks, large quantities of Early Paleozoic granitic rocks were formed.
Detailed geochemical analysis and U-Pb zircon dating were carried out for Qiyilinchang syenogranite and Ganhegoukou monzonitic granite in Baoqing area, Heilongjiang Province. The results show that the ages of the syenogranite and monzonitic granite are 523.3±2.4 Ma and 523.3±2.3 Ma respectively, implying early Cambrian. Petrogeochemical studies show that they have the features of quasi aluminous peraluminous calc alkaline and high differentiation I-type granite with high silicon, high aluminum and rich alkali. They belong to the type of LREE enrichment and HREE depletion. δEu=0.38~1.73,averaging 1.05. According to positive and negative Eu anomalies, the granites in Baoqing area are divided into positive Eu anomaly granite and negative anomaly granite.They are enriched in large ion rock elements(LILE) Rb and K, and depleted in high field strength elements(HFSE) Nb, Ta, P and Ti. Combined with regional tectonic background and chronology, the authors hold that, before early Proterozoic, Jiamusi-Xingkai massif might have belonged to the same continent of Gondwana and then, after the peak period of the Pan African movement, due to the collision of continental blocks, large quantities of Early Paleozoic granitic rocks were formed.
引文
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[35]Maniar P D, Piccoli P M. Tectonic discrimination of granitoids[J].Geological Society of American Bulletin, 1989, 101(5):635-643
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[37]Wright J B. A simple alkalinity ratio and its application toquestions of non-orogenic granite genesis[J]. Geological Magazine, 1969, 106(4):370-384.
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[39]Chappell B W, White A J R. Two contrasting granite types:25years later[J].Australian Journal of Earth Sciences, 2001, 48:489-499.
[40]Barbarin B. A review of the relationships between granitoid types,their origins andtheir geodynamic environments[J]. Lithos, 1999,46:605-626.
[41]Zen E. Aluminum enrichment in silicate melts by fractional crystallization:some mineralogic and petrologic constraints[J].Journal of Petrology, 1986, 27(5):1095-1117.
[42]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社, 1992
[43]Wilde S A, Wu F Y, Zhao G C. The Khanka Block, NE China,and its significance for the evolution of the Central Asian Orogenic Belt and continental accertion[J]. Geological Society London,Special Publications, 2010, 338:117-137.
[44]杨浩,张彦龙,陈会军,等.兴凯湖花岗杂岩体的锆石U-Pb年龄及其地质意义[J].世界地质, 2012, 31(4):621-630
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[3]张兴洲.黑龙江岩系-古佳木斯地块加里东缝合带的证据[J].长春地质学院学报, 1992, 22(增刊):94-101.
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[5]吴福元, Wilde S A,孙德有.佳木斯地体片麻状花岗岩的锆石离子探针年龄[J].岩石学报, 2001, 17:443-452.
[6]Li J Y. Permian geodynamic setting of Northeast China and adjacent regions:closure ofthe Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate[J]. Journalof Asian Earth Sciences, 2006, 26:207-224.
[7]蒲建彬.佳木斯地块东缘上三叠统与二叠纪花岗岩角度不整合的构造意义[D].吉林大学硕士学位论文, 2016
[8]王硕.吉黑东部显生宙岩浆演化与成矿作用研究[D].吉林大学博士学位论文.2014
[9]孙明道.中国东北佳木斯地块及邻区晚中生代岩浆作用和构造意义[D].浙江大学博士学位论文, 2013.
[10]许文良,王枫,孟恩,等.黑龙江省东部古生代—早中生代的构造演化:火成岩组合与碎屑锆石U-Pb年代学证据[J].吉林大学学报(地球科学版),2012,(5):1378-1389.
[11]张昱.黑龙江省东部早中生代火成岩构造组合及其大地构造演化[D].中国地质大学(北京)博士学位论文, 2008.
[12]毕君辉,葛文春,张彦龙,等.佳木斯地块东部二叠纪锦山花岗杂岩体的成因及其地质意义[J].地球科学与环境学报, 2014,(4):16-31.
[13]朱俊宾,和政军.内蒙古林西地区上二叠统—中三叠统沉积序列的碎屑锆石记录及对古亚洲洋(东段)闭合时间的制约[J].地质学报, 2017,(1):232-248.
[14]颉颃强,苗来成,陈福坤,等.黑龙江东南部穆棱地区“麻山群”的特征及花岗岩锆石SHRIMP U-Pb定年——对佳木斯地块最南缘地壳演化的制约[J].地质通报,2008,27(12):2127-2137.
[15]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
[16]吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题[J].岩石学报,2007,(6):1217-1238.
[17]Wang Y Q. Pre-Cambrian Stratigraphy of northeastern China[J].Jilin Geology, 1996, 15(3):1-14
[18]毕君辉.佳木斯地块东部早古生代花岗岩的成因及其构造意义[D].吉林大学硕士学位论文,2015.
[19]华永成,赵振荃,熊鹏磊,等.黑龙江宝清地区早二叠世二长花岗岩年代学及地球化学特征[J].现代矿业, 2016, 32(5):136-141.
[20]Wilde S A, Dorsett-Bain H L, Liu J L. The identication of a LatePan-African granulite facies event in northeastern China:SHRIMPU-Pb zircon dating of the Mashan Group at Liu Mao,HeilongjiangProvince, China[C]//Qian X L, You Z D.Precambrian Geology Metamorphic Petrology, Proceedings of the30th International Geological Congress, Beijing, Utrecht,Netherlands:VSP International Science Publishers, 1997, 17:59-74.
[21]黄映聪,张兴洲,张宏宾,等.黑龙江东部马家街群的岩石地球化学特征及其沉积时代[J].地质学报,2009, 83(2):295-303.
[22]Wilde S A, Zhang X Z, Wu F Y. Extension of a newly identified500 Ma metamorphic terrane in North East China:further U-Pb SHRIMP dating of the Mashan Complex,Heilongjiang Province, China[J]. Tectonophysics, 2000, 328:115-130.
[23]Wilde S A, Wu F Y, Zhang X Z.The mashan complex:SHRIMP U-Pb Zircon evidence for a late Pan-African metamorphic event in NE China and its implication for global continental reconstructions[J]. Geochimica, 2001, 30(1):35-50
[24]Wilde S A, Wu F Y, Zhang X Z. Late Pan-African magmatism innortheastern China:SHRIMP U-Pb zircon evidence from granitoids in the Jiamusi Massif[J]. Precambrian Reseach, 2003,122:311-327
[25]宋彪,李锦轶,牛宝贵,等.黑龙江省东部麻山群黑云斜长片麻岩中锆石的年龄及其地质意义[J].地球学报, 1997, 18(3):306-312.
[26]曹熹,党增欣,张兴洲,等.佳木斯复合地体[M].长春:吉林科学技术出版社, 1992.
[27]李锦轶,牛宝贵,宋彪,等.长白山北段地壳的形成与演化[M].北京:地质出版社, 1999:46-69.
[28]吕长禄.黑龙江俯冲增生杂岩的形成及演化[D].中国地质大学(北京)博士学位论文, 2015.
[29]黄映聪,任东辉,张兴洲,等.黑龙江省东部桦南隆起美作花岗岩的锆石U-Pb定年及其地质意义[J].吉林大学学报(地球科学版), 2008,(4):631-638.
[30]张磊,李秋根,史兴俊,等.佳木斯地块中部二叠纪永清花岗闪长岩的锆石U-Pb年龄、地球化学特征及其地质意义[J].岩石矿物学杂志, 2013, 32(6):1022-1036.
[31]于介江,侯雪刚,葛文春,等.佳木斯地块东北缘早二叠世六连岩体的岩浆混合成因:岩相学、年代学和地球化学证据[J].岩石学报, 2013, 29(9):2971-2986.
[32]Yuan H L,Gao S, Liu X M. Accurante U-Pb age and trace element determinations of zircon by laser ablation-inductively coupledplasma mass spectrometry[J]. Geostand. Newsl., 2004, 28:353-370.
[33]Anderson T. Correction of common lead in U-Pb analyses that do not report204Pb[J]. Chem. Geol., 2002, 192:59-79.
[34]Ludwing K R. Isoplot/Ex version 3.00:A geocheronologaical toolkit for Microsoft Excel[J]. Berkeley Geochronology Center.Special Publication, 2001,(4):1-71.
[35]Maniar P D, Piccoli P M. Tectonic discrimination of granitoids[J].Geological Society of American Bulletin, 1989, 101(5):635-643
[36]Chappell B W, White A J R. Two contrasting granite types, Pacific[J].Geology, 1974, 8(2):173-174.
[37]Wright J B. A simple alkalinity ratio and its application toquestions of non-orogenic granite genesis[J]. Geological Magazine, 1969, 106(4):370-384.
[38]Sun S S, Mcdonough W F. Chemical and isotopicsys tematics of oceanic basalts:implications for mantle composition and processes[C]//Aaunders A D, Norry M J. Magmatism in the Ocean Basins Geological Society London,Special Piblication, 1989, 42(1):313-345.
[39]Chappell B W, White A J R. Two contrasting granite types:25years later[J].Australian Journal of Earth Sciences, 2001, 48:489-499.
[40]Barbarin B. A review of the relationships between granitoid types,their origins andtheir geodynamic environments[J]. Lithos, 1999,46:605-626.
[41]Zen E. Aluminum enrichment in silicate melts by fractional crystallization:some mineralogic and petrologic constraints[J].Journal of Petrology, 1986, 27(5):1095-1117.
[42]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社, 1992
[43]Wilde S A, Wu F Y, Zhao G C. The Khanka Block, NE China,and its significance for the evolution of the Central Asian Orogenic Belt and continental accertion[J]. Geological Society London,Special Publications, 2010, 338:117-137.
[44]杨浩,张彦龙,陈会军,等.兴凯湖花岗杂岩体的锆石U-Pb年龄及其地质意义[J].世界地质, 2012, 31(4):621-630
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