甘肃龙首山成矿带青山堡岩体地球化学特征及成因意义
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摘要
青山堡岩体位于阿拉善地块西南缘,龙首山隆起带与走廊过渡带交界处,产有少量淋积型铀矿床及矿化点,为揭示其成因意义,并初步探讨其构造环境,对青山堡岩体进行地球化学研究。所采样品经野外与显微镜下鉴定分别为肉红色中粗粒钾长花岗岩、灰白色中粗粒二长花岗岩、黑云母花岗闪长岩、石英二长岩。通过对样品进行主量元素和微量元素的测试分析发现; SiO_2质量分数变化范围为62. 79%～78. 51%,全碱(K_2O+Na_2O)含量除一个二长花岗岩样品外其他均大于7. 02%,钾长、二长花岗岩和花岗岩闪长岩里特曼指数为1. 01～2. 47,为钙碱性岩列,石英二长岩里特曼指数3. 39～3. 56,为碱性岩性;在AR-SiO_2图解上,大多样品点投影到钙碱性-碱性系列过渡区域;在微量元素组成上,石英二长岩、花岗闪长岩的稀土总量较高,为204. 0×10~(-6)～289. 5×10~(-6),而钾长花岗岩、二长花岗岩的稀土总量仅为41. 8×10~(-6)～85. 5×10~(-6),稀土元素球粒陨石标准曲线均均为右倾。样品微量元素均富集Th、U、Nb、Zr、Hf等大离子亲石元素(LILE)、稀土元素La、Ce、Nd等稀土元素、亏损Ba、Ta、Nb、Ti、P、Y等高场强元素(HFSE),暗示具有岛弧火山岩的特征。应用主、微量元素构造判别图解,并结合前人对该区构造-岩浆演化的研究,青山堡岩体形成于晚奥陶世北祁连洋岛弧与阿拉善地块碰撞,和之后早志留世造山带根部的岩石发生拆沉,引起造山带上不同块体的伸展、滑塌的构造环境。
The Qingshanbao rock mass is located at the southwestern edge of the Alxa Block,at the junction of the Longshoushan uplift zone corridor transition zone,and produces a small amount of uranium deposits and mineralization sites. This is to reveal the significance of the uranium deposit and to explore its tectonic setting,to conduct geochemical studies on Qingshanbao rock mass. The samples were identified by field and microscopy as The red medium coarse-grained long-grained granite,the gray-white medium coarse-grained monzonite granite,the biotite granodiorite,and the quartz monzonite. Through the analysis of the Major elements and trace elements in the sample,it was found that the SiO_2 mass fraction ranged from 62. 79% to 78. 51%,and the total alkali( K_2O + Na_2O)content was more than 7. 02% except for one monzogranite sample. The Rittmann Index,K-feldspar granite and monzogranite granite diorite are 1. 01 ～ 2. 47 for calc-alkaline rocks,quartz monzonite 3. 39 ～ 3. 56 for alkaline lithology; In the AR-SiO_2 diagram,most of the sample points are projected onto the calcium alkaline-alkaline series transition region; In terms of trace element composition,the total rare earth content of quartz monzonite and granodiorite is higher than that of 204. 0 × 10~(-6)～ 289. 5 × 10~(-6),but the total amount of rare earths of K-feldspar granite and monzonite granite is only 41. 8 × 10~(-6)～ 85. 5 × 10~(-6),the standard curve of rare earth element chondrite are all right-dip. The trace elements in the sample are enriched with Th,U,Nb,Zr,Hf and other large ion lithophile elements( LILE) and rare earth elements such as La,Ce,Nd and other rare earth elements( such as La,Ce,Nd and other rare earth elements),lean Ba,Ta,Nb,Ti,P,and Y. The field strength element( HFSE) implies the characteristics of the island arc volcanic rock. Using the discriminant plots of major and trace elements,combined with previous research on tectonic-magmatic evolution of this area,Qingshanbao rock mass in the collision of the Late Ordovician North Qilian island arc with the Alxa block,and later the Silurian orogen Rocks with roots have undergone demolition,causing structural environments in which different blocks on the orogenic belt stretch and slide.
The Qingshanbao rock mass is located at the southwestern edge of the Alxa Block,at the junction of the Longshoushan uplift zone corridor transition zone,and produces a small amount of uranium deposits and mineralization sites. This is to reveal the significance of the uranium deposit and to explore its tectonic setting,to conduct geochemical studies on Qingshanbao rock mass. The samples were identified by field and microscopy as The red medium coarse-grained long-grained granite,the gray-white medium coarse-grained monzonite granite,the biotite granodiorite,and the quartz monzonite. Through the analysis of the Major elements and trace elements in the sample,it was found that the SiO_2 mass fraction ranged from 62. 79% to 78. 51%,and the total alkali( K_2O + Na_2O)content was more than 7. 02% except for one monzogranite sample. The Rittmann Index,K-feldspar granite and monzogranite granite diorite are 1. 01 ～ 2. 47 for calc-alkaline rocks,quartz monzonite 3. 39 ～ 3. 56 for alkaline lithology; In the AR-SiO_2 diagram,most of the sample points are projected onto the calcium alkaline-alkaline series transition region; In terms of trace element composition,the total rare earth content of quartz monzonite and granodiorite is higher than that of 204. 0 × 10~(-6)～ 289. 5 × 10~(-6),but the total amount of rare earths of K-feldspar granite and monzonite granite is only 41. 8 × 10~(-6)～ 85. 5 × 10~(-6),the standard curve of rare earth element chondrite are all right-dip. The trace elements in the sample are enriched with Th,U,Nb,Zr,Hf and other large ion lithophile elements( LILE) and rare earth elements such as La,Ce,Nd and other rare earth elements( such as La,Ce,Nd and other rare earth elements),lean Ba,Ta,Nb,Ti,P,and Y. The field strength element( HFSE) implies the characteristics of the island arc volcanic rock. Using the discriminant plots of major and trace elements,combined with previous research on tectonic-magmatic evolution of this area,Qingshanbao rock mass in the collision of the Late Ordovician North Qilian island arc with the Alxa block,and later the Silurian orogen Rocks with roots have undergone demolition,causing structural environments in which different blocks on the orogenic belt stretch and slide.
引文
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2黄净白,黄世杰.中国铀资源区域成矿特征.铀矿地质,2005;(3):129-138Huang Jingbai,Huang Shijie.Metallogenic characteristics of uranium resources in China.Uranium Geology,2005;(3):129-138
3赵如意,王博,陈敏川,等.甘肃省龙首山芨岭铀矿床成矿热液流体特征研究.地球学报,2018;(3):282-294Zhao Ruyi,Wang Bo,Chen Minchuan,et al.Study on characteristics of ore-forming hydrothermal fluid in Jiling uranium deposit Longshoushan Gansu Province.Acta Geoscientica Sinica,2018;(3):282-294
4张甲民,赵如意,王刚,等.甘肃芨岭似斑状花岗岩地质特征及其地质意义.地质论评,2017;63(增刊1):89-90Zhang Jiamin,Zhao Ruyi,Wang Gang,et al.The geological characteristics and their significances Jiling porphyritic granite in Gansu Province.Geological Review,2017;63(S1):89-90
5赵亚云,张树明,汤琳,等.龙首山中段芨岭花岗岩体Sr-NdPb同位素特征及意义.地球科学,2016;41(6):1016-1030Zhao Yayun,Zhang Shuming,Tang lin,et al.Sr-Nd-Pb isotopic characteristics and its geological significance of the Jiling grantic pluton in middle Longshoushan.Earth Science,2016;41(6):1016-1030
6陈云杰,赵如意,李涛.甘肃省金边寺矿床铀矿化特征及成矿条件分析.甘肃地质,2011;20(3):46-50Chen Yunjie,Zhao Ruyi,Li Tao.The characteristics of uranium mineralization and analysis of the metallogenic conditions of the Jingbianshi in Gansu Province.Gansu Geology,2011;20(3):46-50
7陈云杰,傅成铭,王伟,等.甘肃金边寺铀矿床成因及找矿方向讨论.矿物学报,2013;33(增刊2):747-748Chen Yunjie,Fu Chengming,Wang Wei,et al.Discussion on the genesis and prospecting direction of uranium deposits Jinbiansi Gansu.Acta Mineralogica Sinica,2013;33(S2):747-748
8魏俏巧,郝立波,陆继龙,等.甘肃河西堡花岗岩LA-MC-ICP-MS锆石U-Pb年龄及其地质意义.矿物岩石地球化学通报,2013;32(6):729-735Wei Qiaoqiao,Hao Libo,Lu Jilong,et al.Zircon U-Pb ages of the LA-MC-ICP-MS for Hexibao granites in Gansu Province and its geological significance.Mineral Rock Geochemical Bulletin,2013;32(6):729-735
9方同辉,王崇礼,王荣.河西堡花岗岩体中闪长质包体与岩浆混合作用.地球科学与环境学报,1997;(4):53-61Fang Tonghui,Wang Chongli,Wang Rong.The mixture of dioritic inclusions and magma in the Hexibao granite body.Journal of Geoscience and Environment,1997;(4):53-61
10方同辉.甘肃省河西堡地区花岗岩演化序列研究.西安:西安地质学院,1994Fang Tonghui.Study on the evolutionary sequence of granite in Hexipao area,Gansu Province.Xi’an:Chang’an University,1994
11甘肃省第一区域地质测量队1∶20万区测报告.兰州:甘肃省第一区域地质测量队,1968First District Geological Survey Team of Gansu Province.1∶20 ten thousands regional measurement report.Lanzhou:First District Geological Survey Team of Gansu Province,1968
12 Liu Y,Zong K,Kelemen P B,et al.Geochemistry and magmatic history of eologites and ultramafic rocks from the Chinese continental scientific drill hole:Subduction and ultrahigh-pressure metamorphism of lower crustal cumulates.Chemical Geology,2008;247:133-153
13 Middlemost E.Naming materials in the magma/igneous rocks system.Earth Science Review,1994;37:215-224
14 Peccerillo R,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area Northern Turkey.Contributions to Mineralogica&Petrology,1976;58:63-81
15 Wright J B.A simple alkalinity ratio and its application to question of non-orogenic granite genesis.Geological Magazine,1969;106(4):370-384
16 Maniar P D,Piccoli P M.Tectonic discrimination of granitoids.Geologlcal Society of America Bulletin,1989;101:635-643
17 Chappell B W,White A J R.Two contrasting granite types.Pacific Geology,1974;8:173-174
18 Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.London:Geological Society London,1989;42:313-345
19秦海鹏.北祁连造山带早古生代花岗岩岩石学特征及其与构造演化的关系.北京:中国地质科学院,2012Qing Haipeng.The petrological characteristics of the early paleozoic granites in the Northern Qilian orogenic belt and their relationship with the tectonic evolution.Beijing:Chinese Academy of Geologecal Sciences,2012
20 Champion D C,Chappell B W.Petrogenesis of felsic I-type granites:An example from northern queensland.Earth and Environmental Science Transactions of the Royal Society of Edinburgh,1992;83(1-2):115-126
21 Chappell B W,White A J R.I-and S-type granites in the Lachlan fold belt.Earth and Environmental Science Transactions of the Royal Society of Edinburgh,1992;83(1-2):1-26
22 Chappell B W,White A J R.Two contrasting granite types:25years later.Australian Journal of Earth Sciences,2001;48(4):489-499
23 Eby G N.Chemical subdivision of the A-type granitoids:Petrogenetic and tectonic implications.Geology,1992;20(7):641-644
24 King P L,Chappell B W,Allen C M,et al.Are A-type granites the high-temperature felsic granites?Evidence from fractionated granites of the Wangrah Suite.Australian Journal of Earth Sciences,2001;48(4):501-514
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