内蒙古赤峰市大营子花岗岩体多期次侵入的证据及其地质意义

doi:10.13278/j.cnki.jjuese.201503112

摘要/Abstract

摘要：

大营子岩体位于内蒙古赤峰市西北部,多年来因发现碾子沟钼矿床而广受关注。通过研究发现,大营子花岗岩无论是野外空间产状、岩相特点及含矿性,还是岩石地球化学及同位素年代学特征,内部的黑云母二长花岗岩和边缘的正长花岗岩都存在明显的差异,显示了该岩体实际上是一个多期岩浆侵入的复合岩体。整体上大营子岩体岩石地球化学特征表现为高硅、富铝、富碱、低镁、贫钙的特点,富集大离子亲石元素(LILE)Rb、Th,亏损高场强元素(HFSE)Ti,亏损P元素。稀土元素组成总体含量较高,轻、重稀土分馏明显,Eu负异常显著。其中,边缘相正长花岗岩比中心相黑云母二长花岗岩具有更明显的Eu负异常和较低的微量元素U、Ba和Sr。边缘正长花岗岩锆石U-Pb同位素年龄为(267.6±2.8)Ma, 属于海西-早印支期华北克拉通北缘岩浆作用的产物,形成于造山晚期或后造山伸展作用诱发的下地壳部分熔融,为季家沟钼矿点(床)的赋矿围岩;中心相黑云母二长花岗岩具有(152.4±1.6)Ma的锆石U-Pb年龄,属于燕山期造山后陆内伸展或岩石圈大规模减薄环境岩浆作用的产物,为碾子沟钼矿床的赋矿围岩。

关键词: 大营子花岗岩, 复合侵入体, 锆石U-Pb测年, 地球化学, 内蒙古赤峰市

Abstract:

Dayingzi granite, which located in northwest Chifeng, Inner Monggolia, attracts great attention for its relation with Nianzigou molybdenum deposit in recent years. Our study shows that there are significant differences between the interior biotite monzonitic granite and the marginal orthoclase granite on the field occurrence, lithofacies, ore potentiality, petrological geochemistry and isotope chronology. These indicate that the granite is a composite rockmass with multistage intrusion. The overall geochemical features of Dayingzi granite is characterized by its high silicon,aluminumrich, alkali-rich, low magnesium, calcium-poor characteristics, with the enrichment of large ion lithophile elements (LILE)Rb,Th, while depleted of high field strength elements (HFSE) Ti, and P. The content of rare earth elements is high, obvious fractionation of light away from heavy rare earth with remarkable Eu negative anomaly. Even more remarkable Eu negative anomaly and lower trace elements of U, Ba and Sr are detected in marginal orthoclase granite than biotite granite. As ore-hosting rock of Jijiagou molybdenum deposit, the marginal orthoclase granite is a product of magmatism process in north margin of North China craton during Hercynian-Early Indo-Chinese epoch as indicated by its U-Pb isotopic age of (267.6±2.8); while as ore-hosting rock of Nianzigou molybdenum deposit, the interior biotite adamellite with a U-Pb isotopic age of (152.4±1.6) Ma, is a product of the intra-continental extension in a postorogenic or the large scale lithosphere thinning environment during Indo-Chinese Early Yanshanian.

Key words: Dayingzi granite, composite intrusion, Zircon U-Pb dating, geochemistry, Chifeng City in Inner Mongolia

中图分类号:

P588.1

郗爱华, 马艳军, 葛玉辉, 唐向阳, 刘帅, 徐博文, 刘珏. 内蒙古赤峰市大营子花岗岩体多期次侵入的证据及其地质意义[J]. 吉林大学学报(地球科学版), 2015, 45(3): 791-803.

Xi Aihua, Ma Yanjun, Ge Yuhui, Tang Xiangyang, Liu Shuai, Xu Bowen, Liu Jue. Multi-Stage Intrusive Evidence and Geological Significance of Dayingzi Granite in Chifeng,Eastern Inner Mongolia[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(3): 791-803.

参考文献

[1] 曾庆栋,刘建明,张作伦,等.华北克拉通北缘西拉沐沦钼多金属成矿带钼矿化类型、特征及地球动力学背景[J].岩石学报,2009,25(5):1225-1238. Zeng Qingdong,Liu Jianming,Zhang Zuolun,et al.Mineralizing Types,Geological Characteristics and Geodynamic Background of Molybdenum Deposits in Xilamulun Molybdenum Polymetal Metallogenic Belt on North China Craton[J].Acta Petrologica Sinica,2009,25(5):1225-1238.

[2] 张连昌,吴华英,相鹏,等.中生代复杂构造体系的成矿过程与成矿作用:以华北大陆北缘西拉木伦钼铜多金属成矿带为例[J].岩石学报,2010,26(5):1351-1362. Zhang Lianchang,Wu Huaying,Xiang Peng,et al.Ore Forming Processes and Mineralization of Complex Tectonic System During the Mesozoic:A Case from Xilamulun Cu、Mo Metallogenic Belt[J].Acta Petrologica Sinica,2010,26(5):1351-1362.

[3] 黄凡,陈毓川,王登红,等.中国钼矿主要矿集区及其资源潜力探讨[J].中国地质,2011,38(5):1111-1134. Huang Fan,Chen Yuchuan,Wang Denghong,et al.A Discussion on the Major Molybdenum Ore Concentration Areas in China and Their Resource Potential[J].Geology in China.2011, 38(5):1111-1134.

[4] 曾庆栋,褚少雄,段晓侠,等.兴蒙造山带东段斑岩钼矿床[J].矿物学报,2013(增刊2):76. Zeng Qingdong,Chu Shaoxiong,Duan Xiaoxia,et al.Porphyry Molybdenum Deposit in Eastern Xingpanling-Mongolian Orogenic Belt[J].Acta Mineralogica Sinica,2013(Sup.2):76.

[5] 曾庆栋,刘建明,褚少雄,等.西拉沐伦成矿带中生代花岗岩浆活动与钼成矿作用[J].吉林大学学报:地球科学版,2011,41(6):1705-1714,1725. Zeng Qingdong,Liu Jianming,Chu Shaoxiong,et al.Mesozoic Granitic Magmatism and Molybdenum Ore-Forming Processes in the Xilamulun Metallogenic Belt[J].Journal of Jilin University:Earth Science Edition,2011, 41(6):1705-1714,1725.

[6] 陈志广,张连昌,吴华英,等.内蒙古西拉木伦成矿带碾子沟钼矿区A型花岗岩地球化学和构造背景[J].岩石学报, 2008,24(4):879-889. Chen Zhiguang,Zhang Lianchang,Wu Huaying,et al.Geochemistry Study and Tectonic Background of A Style Host Granite in Nianzigou Molybdenum Deposit in Xilamulin Molybdnum Metallogenic Belt,Inner Mongolia[J].Acta Petrologica Sinica,2008,24(4):879-889.

[7] 张作伦, 刘建明, 曾庆栋.内蒙古碾子沟钼矿床SHRIMP锆石U-Pb年龄、硫同位素组成及其地质意义[J].矿床地质, 2011, 30(6):1122-1128. Zhang Zuolun,Liu Jianming,Zeng Qingdong.SHRIMP Zircon U-Pb Dating and Sulfur Isotope Compositions of Nianzigou[J]. Mineral Deposits, 2011, 30(6):1122-1128.

[8] 李朋武,高锐,管烨,等. 内蒙古中部索伦林西缝合带封闭时代的古地磁分析[J]. 吉林大学学报:地球科学版,2006,36(5):744-758. LI Pengwu,Gao Rui,Guan Ye,et al.Palaeomagnetic Constraints on the Final Closure Time of Solonker-Linxi Suture[J].Journal of Jilin University:Earth Science Edition,2006,36(5):744-758.

[9] 刘伟,杨进辉,李潮峰.内蒙赤峰地区若干主干断裂带的构造热年代学[J]. 岩石学报,2003,19(4):717-728. Liu Wei,Ya Jinhui, Li Chaofeng.Thermochronoology of Three Major Faults in the Chifeng Area,Inner Mongolia of China[J].Acta Petrologica Sinica, 2003, 19(4):717-728.

[10] 李益龙,周汉文,钟增球,等.华北与西伯利亚板块的对接过程:来自西拉木伦缝合带变形花岗岩锆石LA-ICP-MS U-Pb年龄证据[J].地球科学:中国地质大学学报,2009,34(6):931-938. Li Yilong,Zhou Hanwen,Zhong Zengqiu,et al.Collision Processes of North China and Siberian Plates: Evidence from LA-ICP-MS Zircon U-Pb Age on Deformed Granite in Xar Moron Suture Zone[J].Earth Science:Journal of China University of Geosciences, 2009,34(6)931-938.

[11] 李双林, 欧阳自远.兴蒙造山带及邻区的构造格局与构造演化[J].海洋地质与第四纪地质, 1998,18(3):45-54. Li Shuanglin,Ouyang Ziyuan.Tectonic Framework and Evolution of Xing'anling-Mongolian Orogenic Belt(XMOB) and Its Adjacent Region[J].Marine Geology & Quaternary Geology, 1998,18(3):45-54.

[12] 王友,潘志勇,方曙,等.西拉木伦河北岸发现地质资料及其构造意义[J].内蒙古地质, 1999(1):6-28. Wang You,Pan Zhiyong,Fang Shu,et al.The Tectonic Significance of Geological Data Found in North Xilamulun River[J].Geology of Inner Mongolia, 1999(1):6-28.

[13] 丁国瑜.中国岩石圈动力学概论:《中国岩石圈动力学地图集》说明书[M]. 北京:地震出版社, 1991. Ding Guoyu.Overview of Lithospheric Dynamics of China: The Lithosphere Dynamics Atlas of China[M]. Beijing:Seismological Press, 1991.

[14] 柳小明,高山,袁洪林,等. 单颗粒锆石的 20μm 小斑束原位微区 LA-ICP-MS U-Pb 年龄和微量元素的同时测定[J]. 科学通报,2007,52(2):228-235. Liu Xiaoming,Gao Shan,Yuan Honglin,et al.Single Zircon 20 μm Spot Size in Situ Micro-LA-ICP-MS U-Pb Age and Simultaneous Determination of Trace Elements[J]. Chinese Science Bulletin, 2007,52(2):228-235.

[15] 刘英俊, 曹励明. 元素地球化学导论[M]. 北京:地质出版社, 1987. Liu Yingjun,Cao Liming.Introduction to Geochemistry[M].Beijing:Geological Publishing House,1987.

[16] 张作伦,曾庆栋,屈文俊,等. 内蒙碾子沟钼矿床辉钼矿 Re-Os 同位素年龄及其地质意义[J]. 岩石学报,2009,25(1):212-218. Zhang Zuolun,Zeng Qingdong,Qu Wenjun,et al.The Molybdenite Re-Os Dating from the Nianzigou Mo Deposit, Inner Mongolia and Its Geological Significance[J]. Acta Petrologica Sinica,2009,25(1):212-218.

[17] Guilbert J M. Geology, Alteration, Mineralization, and Genesis of the Bajo De La Alumbrera Porphyry Copper-Gold Deposit, Catamarca Province,Argentina[J].Arizona Geological Society Diges, 1995, 20:646-656.

[18] 孙燕,刘建明,曾庆栋.斑岩型铜(钼)矿床和斑岩型钼(铜)矿床的形成机制探讨:流体演化及构造背景的影响[J].地学前缘,2012, 19(6):179-193. Sun Yan,Liu Jianming,Zeng Qingdong.An Approach to the Metallogenic Mechanism of Porphyry Copper (Molybdenum) Deposits and Porphyry Molybdenum (Copper) Deposits:Influence of Evolving Processes of Ore-Forming Fluids and Tectonic Settings[J].Earth Science Frontiers,2012,19(6):179-193.

[19] 孙景贵,张勇,邢树文,等.兴蒙造山带东缘内生钼矿床的成因类型、成矿年代及成矿动力学背景[J].岩石学报,2012,28(4):1317-1332. Sun Jinggui,Zhang Yong,Xing Shuwen,et al.Genetic Types, Ore-Forming Age and Geodynamic Setting of Endogenic Molybdenum Deposits in the Eastern Edge of Xing-Meng Orogenic Belt[J].Acta Petrologica Sinica,2012, 28(4):1317-1332.

[20] Canus F,Silltioer H,Petersen R.Andean Copper Deposits:New Discoveries, Mineralization Style and Metallogen[J]. Society of Economic Geologists,1996, 5:198.

[21] Mitchell A H G.Metallogenic Belts and Angle of Dip of Benioff Zones[J]. Nature, 1973,245:49-52.

[22] Richards J P,Boyce A J,Pringle M S. Geologic Evolution of the Escondida Area,Northern Chile:A Model for Spatial and Temporal Location of Porphyry Cu Mineralization[J]. Economic Geology, 2001,96:271-306.

[23] 芮宗瑶,张洪涛,陈仁义,等. 斑岩铜矿研究中若干问题探讨[J].矿床地质, 2006, 25(4):491-500. Rui Zongyao,Zhang Hongtao,Chen Renyi,et al.An Approach to Some Problems of Porphyry Copper Deposits[J].Mineral Deposits, 2006, 25(4):491-500.

[24] 张连昌,陈志广,吴华英,等.内蒙古西拉木伦铜-钼成矿带花岗岩特征与成矿专属性[J].矿物岩石地球化学通报,2008,27(z1):242-243. Zhang Lianchang,Chen Zhiguang,Wu Huaying,et al.Inner Mongolia Silas Wood Copper-Molybdenum Metallogenic Belt Granite Characteristics and Metallogenic Exclusive[J]. Bulletin of Mineralogy Petrology and Geochemistry,2008,27(z1):242-243.

[25] 柴社立,蔡晶,邹祖荣. 华北地台含钼和含金花岗岩系的地质地球化学及其成矿作用对比研究[J]. 长春地质学院学报,1994,24(3):284-290,302. Chai Sheli,Cai Jing,Zou Zurong.A Comparative Study on Geology and Geochemistry and Minralization of the Mo-Bearing and Au-Bearing Granite on the North China Platform[J].Journal of Chuangchun University of Earth Sciences,1994,24(3):284-290,302.

[26] 芮宗瑶,侯增谦,李光明,等. 俯冲、碰撞、深断裂和埃达克岩与斑岩铜矿[J].地质与勘探, 2006,42(1):1-6. Rui Zongyao,Hou Zengqian,Li Guangming,et al. Subduction, Collision, Deep Fracture, Adakite and Porphyry Copper Deposits[J].Geology and Prospecting, 2006,42(1):1-6.

[27] Sillitoe R H.Characteristics and Controls of the Largest Porphyry Copper-Gold and Epithermal Gold Deposits in the Circum-Pacific Region[J].Australian Journal of Earth Sciences, 1997,44(3):373-388.

[28] 杨志明,侯增谦.初论碰撞造山环境斑岩铜矿成矿模型[J].矿床地质,2009,28(5):515-538. Yang Zhiming,Hou Zengqian.Porphyry Cu Deposits in Collisional Orogen Setting:Apreliminary Genetic Model[J].Mineral Deposits, 2009, 28(5):515-538.

[29] 曲晓明,侯增谦,黄卫.冈底斯斑岩铜矿(化)带:西藏第二条"玉龙"铜矿带?[J].矿床地质, 2001, 20(4):355-366. Qu Xiaoming,Hou Zengqian,Huang Wei.Is Gangdese Porphyry Copper Belt the Second "Yulong" Copper Belt?[J].Mineral Deposits,2001, 20(4):355-366.

[30] Hou Zengqian,Yang Zhiming,Qu Xiaoming,et al.The Miocene Gangdese Porphyry Copper Belt Gene-rated During Post-Collisionalextension in the Tibetan Orogen[J].Ore Geology Reviews,2009,36:25-51.

[31] 毛景文, 张作衡, 于金杰, 等.华北及邻区中生代大规模成矿的地球动力学背景:从金属矿床年龄精测得到的启示[J].中国科学:D辑:地球科学版, 2003, 33(4):289-299. Mao Jingwen,Zhang Zuoheng,Yu Jinjie,et al.The Geodynamic-Background of Mesozoic Large-Scale Mineralization in North China and Adjacent Areas:Revelation from Precise and Accurate Ages of Metal Deposits[J].Science in China:Series D:Earth Sciences, 2003,33(4):289-299.

[32] 代军治, 毛景文, 杨富全,等.华北地台北缘燕辽钼(铜)成矿带矿床地质特征及动力背景[J].岩石学报,2006,24(4):879-889. Dai Junzhi, Mao Jingwen, Yang Fuquan, et al. Geological Characteristics and Geodynamic Background of Molybdenum (Copper) Deposits Along Yanshan-Liaoning Metallogenic Belt on Northern Margin of North China Block[J].Acta Petrologica Sinica,2006,24(4):879-889.

[33] 毛景文,李晓峰,张作衡,等.中国东部中生代浅成热液金矿的类型、特征及其地球动力学背景[J].高校地质学报,2003,9(4):620-637. Mao Jingwen,Li Xiaofeng,Zhang Zuoheng,et al.Geology, Distribution, Types and Tectonic Settings of Mesozoic Epithermal Gold Deposits in East China[J].Geological Journal of China Universities,2003,9(4):620-637.

[34] 陈衍景,张成,李诺,等.中国东北钼矿床地质[J].吉林大学学报:地球科学版,2012,42(5):1223-1268. Chen Yanjing,Zhang Cheng,Li Nuo,et al.Geology of the Mo Deposits in Northeast China[J]. Journal of Jilin University:Earth Science Edition,2012,42(5):1223-1268.

[35] 葛文春, 吴福元, 周长勇, 等.兴蒙造山带东段斑岩型Cu Mo矿床成矿时代及其地球动力学意义[J].科学通报, 2007,52(20):2407-2417. Ge Wenchun, Wu Fuyuan,Zhou Changyong,et al.Geology, Distribution,Types and Tectonic Settings of Mesozoic Epithermal Gold Deposits in East China[J]. Chinese Science Bulletin, 2007,52(20):2407-2417.

[36] 陈伟军,刘建明,刘红涛,等.内蒙古鸡冠山斑岩钼矿床成矿时代和成矿流体研究[J]. 岩石学报,2010,26(5):1423-1436. Chen Weijun,Liu Jianming,Liu Hongtao,et al.Geochronology and Fluid Inclusion Study of the Jiguan-shan Porphyry Mo Deposit,Inner Mongolia[J]. Acta Petrologica Sinica,2010,26(5):1423-1436.

[37] 赵越,杨振宇,马醒华.东亚大地构造发展的重要转折[J].地质科学,1994,29(2):105-119. Zhao Yue,Yang Zhengyu,Ma Xinghua.The Important Turning Point in the Development of East Asian tectonic[J]. Chinese Journal of Geology,1994,29(2):105-119.

[38] 芮宗瑶,张洪涛,李宁,等. 论花岗质岩浆多重侵位及其多重成矿模型[J]. 岩石矿物学杂志,1991,10(2):97-104. Rui Zongyao,Zhang Hongtao,Li Ning,et al.Discuss on Multiple Emplacement and Multiple Metallogenic Model About Granitic Magma[J]. Acta Petrologica et Mineralogica,1991, 10(2):97-104.

[39] 芮宗瑶,张洪涛,王龙生,等.吉林延边地区斑岩型:浅成热液型金铜矿床[J].矿床地质,1995,14(2):99-126. Rui Zhongyao,Zhang Hongtao,Wang Longsheng,et al.Porphyry-Epithermal Gold-Copper Deposit in Jilin Yanbian Area[J].Mineral Deposits,1995, 14(2):99-126.

[40] 杨言辰,韩世炯,孙德有,等.小兴安岭:张广才岭成矿带斑岩型钼矿床岩石地球化学特征及其年代学研究[J]. 岩石学报,2012,28(2):379-390. Yang Yanchen,Han Shijiong,Sun Deyou,et al.Geological and Geochemical Features and Geochronology of Porphyry Molybdenum Deposits in the Lesser Xing'an Range-Zhangguangcai Range Metallogenic Belt[J]. Acta Petrologica Sinica,2012, 28(2):379-390.

[41] 刘宝山,马永强,吕军,等.伊春地区上游新村晚三叠世二长花岗岩体成因及就位机制[J]. 地质与资源,2005, 14(3):170-175,191. Liu Baoshan,Ma Yongqiang,Lü Jun,et al. Genesis and Emplacement Mechanism of the Late Triassic Adamllite Series in Yichun Area,Heil Ongjiang Proovince[J]. Geology and Resources,2005,14(3):170-175,191.

[42] 韩振哲,赵海玲, 李娟娟,等.小兴安岭东南伊春一带早中生代花岗岩与多金属成矿作用[J]. 中国地质,2010,37(1):74-87. Han Zhenzhe,Zhao Hailing,Li Juanjuan,et al.Early Mesozoic Granites and Polymetallic Mineralization in Southeastern Yichun Area,Xiao Hinggan Mountains[J]. Geology in China,2010, 37(1):74-87.

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