东昆仑战红山地区花岗斑岩LA-ICP-MS锆石U-Pb测年及岩石地球化学特征

李积清; 张鑫利; 王涛; 李青; 王泰山; 薛万文

doi:10.19751/j.cnki.61-1149/p.2021.01.003

东昆仑战红山地区花岗斑岩LA-ICP-MS锆石U-Pb测年及岩石地球化学特征

青海省地质调查院, 青藏高原北部地质过程与矿产资源重点实验室, 青海西宁 810012

基金项目:

青海省应用基础研究项目“青海省布青山地区金多金属成矿作用及找矿方向研究”（2018-ZJ-733、2018-SF-109），青海省省级财政勘查资金“青海省坑得弄舍-苦海地区金多金属矿成矿规律研究与靶区优选”项目（青国土资[2017]189号）

详细信息

作者简介:
李积清(1985-),男,青海乐都人,高级工程师,从事区域地质调查及矿产勘查工作。E-mail:lijiqing8999@163.com

通讯作者:
张鑫利(1987-),男,宁夏同心人,工程师,从事区域地质调查及矿产勘查工作。E-mail:317558467@qq.com

中图分类号: P595
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出版历程
- 收稿日期: 2020-04-09
- 修回日期: 2020-10-15
- 网络出版日期: 2022-07-28
- 发布日期: 2021-03-04

Zircon U-Pb Dating and Geochemical Characteristics of Granite Porphyry in Zhanhongshan Area, East Kunlun

Qinghai Geological Survey Institute, Key Laboratory of Geological Processes and Mineral Resources in Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China

摘要

摘要: 在野外调查的基础上，对东昆仑战红山地区花岗斑岩通过锆石U-Pb测年和地球化学研究，获得花岗斑岩成岩年龄为（243.4±1.5）Ma（MSWD=0.99），属中三叠世。岩石地球化学特征显示岩石SiO₂为73.82%~75.65%，K₂O/Na₂O=0.61~0.95，相对富钠，贫MnO（0.05%~0.06%）、P₂O₅（0.05%）和TiO₂（0.17%~0.2%），A/CNK值为1~1.09，平均为1.053，Al₂O₃为12.02%~13.12%，里特曼指数δ值为1.61~1.89，TFeO/MgO为2.44~2.54，DI为91.2~92.64，表明其为过铝质、钙碱性岩系列的高分异I型花岗岩。岩石稀土总量较低（ΣREE=134.89×10^-6~165.65×10^-6），LREE/HREE=7.99~8.85，（La/Yb）_N=9.9~11.21，轻重稀土分馏明显，表现出轻稀土富集而重稀土亏损的右倾曲线。δEu为0.58~0.66，岩石具大离子亲石元素Rb、Ba及高场强元素U、Th、Pb相对富集，K、P、Ti相对亏损特征。结合岩石成岩年龄、地球化学特征以及区域构造演化，认为其形成于古特提斯洋向北俯冲的碰撞环境。
- 花岗斑岩 /
- 锆石U-Pb测年 /
- 中三叠世 /
- 东昆仑 /
- 战红山
Abstract: Based on the field investigation of granite porphyry in Zhanhongshan area of East Kunlun, zircon U-Pb dating and geochemical study show that the granite porphyry has a diagenetic age of (243.4 ±1.5) Ma (MSWD=0.99), belonging to the Middle Triassic. The geochemical characteristics of the rocks show that the SiO₂ ranges from 73.82% to 75.65%, K₂O/Na₂O=0.61-0.95, relatively rich in sodium, poor in MnO (0.05%~0.06%), P₂O₅ (0.05%) and TiO₂ (0.17%~0.2%). The A/CNK value is 1~1.09, with an average of 1.053. Al₂O₃ is between 12.02%~13.12%. The values of δ are 1.61~1.89. TFeO/MgO is 2.44~2.54 and DI is 91.2~92.64. All these show that it is a highly fractionated I-type granite of peraluminous and calc-alkaline series. The total REE content of the rocks is low (∑REE=134.89×10^-6~165.65×10^-6), LREE/HREE=7.99~8.85, (La/Yb)_N=9.9~11.21. The fractionation of LREE and HREE is obvious, showing a right dipping curve of LREE enrichment and HREE depletion.δEu is 0.58~0.66. The rocks are characterized by a relative enrichment of large ion lithophiles of Rb, Ba and high field strength elements of U, Th, Pb, whereas a depletion of K, P and Ti. Combined with the diagenetic age, geochemical characteristics and regional tectonic evolution,the authors hold that the rocks formed in the collision environment of the northward subduction of the PaleoTethys ocean.
- granite porphyry /
- zircon U-Pb dating /
- the Middle Triassic /
- East Kunlun /
- Zhanhongshan

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参考文献(45)

殷鸿福,张克信.东昆仑造山带的一些特点[J].地球科学:中国地质大学学报,1997,22(4):339-342.

YIN Hongfu,ZHANG Kexin.Some characteristics of the East Kunlun orogenic belt[J].Earth Science-Journal of China University of Geosciences,1997,22(4):339-342.

莫宣学,潘桂棠.从特提斯到青藏高原形成:构造岩浆事件的约束[J].地学前缘,2006,13(6):43-51.

MO Xuanxue,PAN Guitang.From the Tethys to the formation of the Qinghai-Tibet Plateau:constrained by tectono-magmatic events[J].Earth Science Frontiers,2006,13(6):43-51.

莫宣学,罗照华,邓晋福,等.东昆仑造山带花岗岩及地壳生长[J].高校地质学报,2007,13(3):403-414.

MO Xuanxue,LUO Zhaohua,DENG Jinfu,et al. Granitoids and Crustal Growth in the East-Kunlun Orogenic Belt[J].Geological Journal of China Universities,2007,13(3):403-414.

肖小强,胡俊,管波,等.东昆仑东段金矿带地质特征及找矿潜力分析[J].黄金科学技术,2012,20(3):40-45.

XIAO Xiaoqiang,HU Jun,GUAN Bo,et al. Geological Characteristics and Prospecting Analysis of Gold Ore Belt in East Section of Eastern Kunlun[J].Gold Science and Technololgy,2012,20(3):40-45.

马维明,罗永统,张学德,等.青海沟里地区复合造山过程与金多金属成矿关系[J].现代矿业,2015,11(11):158-160.

MA Weiming,LUO Yongtong,ZHANG Xuede,et al. Relationship between complex orogenic process and gold polymetallic mineralization in Gouli area, Qinghai Province[J].Modern Mining,2015,11(11):158-160.

丰成友,李东生,吴正寿,等.东昆仑祁漫塔格成矿带矿床类型、时空分布及多金属成矿作用[J].西北地质,2010,43(4):10-17.

FENG Chengyou,LI Dongsheng,WU Zhengshou,et al. Major Types, Time-Space Distribution and Metallogeneses of Polymetallic Deposits in the Qimantage Metallogenic Belt, Eastern Kunlun Area[J].Northwestern Geology,2010,43(4):10-17.

蒋光明.青海省玛多县坑得弄舍金-铅-锌多金属矿床成因及成矿规律研究[D].长沙:中南大学,2014.

JIANG Guangming.Genesis and metallogenic regularity of kengdelongshe gold lead zinc polymetallic deposit in Maduo County, Qinghai Province[D].Changsha:Central South University,2014.

边千韬,罗小全,陈海泓,等.阿尼玛卿蛇绿岩带花岗-英云闪长岩锆石U-Pb同位素定年及大地构造意义[J].地质科学,1999,34(4):420-426.

BIAN Qiantao,LUO Xiaoquan,CHEN Haihong,et al. Zircon U-Pb isotopic dating of granodiorite in the Animaqing ophiolite belt and its tectonic significance[J].Chinese Journal of Geology,1999,34(4):420-426.

吴元宝,郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报,2004,49(16):1589-1604.

WU Yuanbao,ZHENG Yongfei.Genetic mineralogy of zircon and its constraints on U-Pb age interpretation[J].Chinese Science Bulletin,2004,49(16):1589-1604.

罗照华,邓晋福,曹永清,等.青海省东昆仑地区晚古生代-早中生代火山活动与区域构造演化[J].现代地质,1999,13(1):51-56.

LUO Zhaohua,DENG Jinfu,CAO Yongqing,et al. Late Paleozoic early Mesozoic volcanic activity and regional tectonic evolution in the East Kunlun area, Qinghai Province[J].Geoscience,1999,13(1):51-56.

莫宣学,罗照华,邓晋福,等.东昆仑造山带花岗岩及地壳生长[J].高校地质学报,2007,13(3):403-414.

MO Xuanxue,LUO Zhaohua,DENG Jinfu.Granitoids and Crustal Growth in the East-Kunlun Orogenic Belt[J].Geological Journal of China Universities,2007,13(3):403-414.

郭正府,邓晋福.青藏东昆仑晚古生代末-中生代中酸性火成岩与陆内造山过程[J].现代地质,1998,12(3):344-352.

GUO Zhengfu,DENG Jinfu.Intermediate acid igneous rocks and intracontinental orogeny in the late Paleozoic to Mesozoic in Eastern Kunlun, Qinghai Tibet[J].Geoscience,1998,12(3):344-352.

刘成东,莫宣学.东昆仑壳-幔岩浆混合作用:来自锆石SHRIMP年代学的证据[J].科学通报,2004,49(6):596-602.

LIU Chengdong,MO Xuanxue.Crust mantle magma mixing in the East Kunlun Mountains:evidence from zircon SHRIMP geochronology[J].Chinese Science Bulletin,2004,49(6):596-602.

陈国超,裴先志,李瑞宝,等.东昆仑东段可日正长花岗岩年龄和岩石成因对东昆仑中三叠世构造演化的制约[J].岩石学报,2018,34(3):567-585.

CHEN Guochao,PEI Xianzhi,LI Ruibao,et al. Age and lithogenesis of Keri syenogranite from eastern part of East Kunlun Orogenic Belt:Constraint on the Middle Triassic tectonic evolution of East Kunlun[J].Acta Petrologica Sinica,2018,34(3):567-585.

胡晨光,裴先治,李瑞保,等.东昆仑东段阿此特地区变基性侵入岩锆石U-Pb年龄及地质意义[J].西北地质,2017,50(1):182-197.

HU Chenguang,PEI Xianzhi,LI Ruibao,et al. Zircon U-Pb Ages and Geological Significance of Metamorphic Basic Intrusive Rocks in the Acite Area of East Kunlun[J].Northwestern Geology,2017,50(1):182-197.

杜玉良,贾群子,韩生福,等.青海东昆仑成矿带中生代构造-岩浆-成矿作用及铜金多金属找矿研究[J].西北地质,2012,45(4):69-75.

DU Yuliang, JIA Qunzi, HAN Shengfu, et al.Mesozoic Tectono-Magmatic-Mineralization and Copper-Gold Polymetallic Ore Prospecting Research in East Kunlun Metallogenic Belt in Qinghai[J].Northwestern Geology,2012,45(4):69-75.

罗照华,柯珊,曹永清,等.东昆仑印支晚期慢源岩浆活动[J].地质通报,2002,21 (6):292-297.

LUO Zhaohua,KE Shan,CAO Yongqing,et al. Late Indosinian slow source magmatism in East Kunlun[J].Geological Bulletin of China,2002,21 (6):292-297.

王兴,裴先治,李瑞保,等. 东昆仑东段下三叠统洪水川组砾岩源区研究:来自砾岩特征及锆石U-Pb年龄的证据[J]. 中国地质, 2019, 46(1):155-177.

WANG Xing,PEI Xianzhi,LI Ruibao,et al. Conglomerate source and source area property of Lower Triassic Hongshuichuan Formation in the East Kunlun Mountains:Evidence from conglomerate characteristics and U-Pb dating[J]. Geology in China, 2019, 46(1):155-177(in Chinese with English abstract).

Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37(3-4):215-224.

Rickwood P C.Boundary lines within petrologic diagrams which use oxides of major and minorelements[J].Lithos,1989,22(4):247-263.

Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle compostion and processes[J].Geological Society London Special Publications,1989,42(1):313-345.

Slama J, Kosler J,Condon D J.Plesovice zircon-A new natural reference material for U-Pb and Hf isotopic microanalysis[J].Chemical Geology,2008,249(1-2):1-35.

Taylor S R and Mclennan SM. The geochemical evolution of the continental crust[J]. Reviews of Geophysics,1995, 33:241-265.

Peccerillo A,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kasamonou area,Northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58(1):63-81.

Whalen J B, Currie K L, Chappell B W. A-type granites:geochemical characteristics, discrimination and petrogenesis[J]. Contributions to Mineralogy and Petrology, 1987,95:407-419

Collins WJ.Beams S D.White A J R.et al. Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy and Petrology,1982,80(2):189-200.

Pearce JA,Harris N B W,Tindle A G.Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic-Rocks[J].Journal of Petrology,1984,25(4):956-983.

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