青海格尔木深沟地区基性侵入岩岩石地球化学特征及地质意义
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摘要
青海省格尔木市深沟地区分布少量的基性侵入岩,岩性组合主要为辉长岩,并有少许辉石闪长岩、角闪岩等。基性侵入岩的锆石U-Pb年龄值分别为(205. 7±4. 5)Ma和(209. 1±3. 6) Ma,侵入岩属东昆仑地区印支晚期构造—岩浆活动的产物。主量元素地球化学成分上,基性侵入岩具有低Si、低K和高Fe、高Mg、高Ca的特征;稀土总量高且变化范围大,其"REE=70. 31×10~(-6)#309. 66×10~(-6)(平均193. 33×10~(-6))。绝大多数岩石的负铕异常明显(Eu/Eu*=0. 65#0. 75)。印支晚期基性侵入岩表现出Ba、K、P、Y元素的亏损和Zr、Hf元素的富集,说明岩体物质来源主要与富集型地幔有关。深沟地区基性侵入岩具有较好的形成铜镍硫化物矿床的条件。
There are a few of intrusive rocks distributed in Shengou district of Golmud,Qinghai. The majorlithology is gabbrowitha small amount of pyroxene diorite andamphibolite etc.. The zircon U-Pb ages of the basic intrusive rocks are( 205. 7 ± 4. 5) Ma and( 209.1±3.6) Ma respectively,the intrusive rocks are the product of the late Indosinian tectonic magmatic activities in the East Kunlun. About the major elements' geochemical composition,the basic intrusive rocks is low in Si and K and is high in Fe,Mg and Ca; Thetotal amount of the rare earth( REE) is high and varies in a wide range of 70.31× 10~(-6)～ 309.66 × 10~(-6)( averageis of 193.33 ×10~(-6)).The most majority of rocks hasnegative Eu anomalies( Eu/Eu*= 0.65 ～ 0.75). The basic intrusive rocks inlate Indosinian showthe lossof Ba,K,P and Y and enrichment of Zr and Hf,indicating that the source of rock mass is mainly related to the enriched mantle. Thebasic intrusive rocks in Shengou district have good conditions for the formation of copper-nickel sulfide deposits.
There are a few of intrusive rocks distributed in Shengou district of Golmud,Qinghai. The majorlithology is gabbrowitha small amount of pyroxene diorite andamphibolite etc.. The zircon U-Pb ages of the basic intrusive rocks are( 205. 7 ± 4. 5) Ma and( 209.1±3.6) Ma respectively,the intrusive rocks are the product of the late Indosinian tectonic magmatic activities in the East Kunlun. About the major elements' geochemical composition,the basic intrusive rocks is low in Si and K and is high in Fe,Mg and Ca; Thetotal amount of the rare earth( REE) is high and varies in a wide range of 70.31× 10~(-6)～ 309.66 × 10~(-6)( averageis of 193.33 ×10~(-6)).The most majority of rocks hasnegative Eu anomalies( Eu/Eu*= 0.65 ～ 0.75). The basic intrusive rocks inlate Indosinian showthe lossof Ba,K,P and Y and enrichment of Zr and Hf,indicating that the source of rock mass is mainly related to the enriched mantle. Thebasic intrusive rocks in Shengou district have good conditions for the formation of copper-nickel sulfide deposits.
引文
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王冠,孙丰月,李碧乐,等.2013.东昆仑夏日哈木矿区早泥盆世正长花岗岩锆石U-Pb年代学、地球化学及其动力学意义[J].大地构造与成矿学,37(4):685-697.
邹海洋,戴塔根,胡翔昭.2001.喀拉通克铜镍硫化矿地质特征及找矿预测[J].地质地球化学,29(3):70-75.
Le Bas M J,Le Maitre R W,Streckheisen A,et al.1986.A chemical classification of volcanic rocks based on the total alkali-silica diagram[J].Journal of Petrology,27:745-750.
Le Maitre,R W,Bateman P,Dudek A,et al.1989.A classification of igneous rocks and glossary of terms[M].Blackwell Scientific Publication,Oxford,193.
Rickwood P C.1989.Boubdary lines within petrologyic diagrams which use oxides of major and minor elements[J].Lithos,22:247-263.
Sun S S.and Mc Donough W F.1989.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[C]//A D Saunders and M J Norry.Magmatism in the ocean basins.London,Geological Society Special Publication,345.
丰成友,王松,李国臣,等.2012.青海祁曼塔格中晚三叠世花岗岩:年代学、地球化学及成矿意义[J].岩石学报,28(2):665-678.
黄汲清,任纪舜,姜春发,张之孟,许志琴.1977.中国大地构造基本轮廓[J].地质学报,51(2):117-135.
姜春发,杨经绥,冯秉贵,朱志直,赵民,柴耀楚.1992.昆仑开合构造[M].北京:地质出版社:183-217.
喇品贤,马林,等.2017.青海省格尔木市深沟地区镍矿预查报告[R].青海省地质矿产勘查开发局.
李碧乐,孙丰月,于晓飞,等.2012.东昆中隆起带东段闪长岩U-Pb年代学和岩石地球化学研究[J].岩石学报,28(4):1163-1172.
罗照华,邓晋福,曹永清,郭正府,莫宣学.1999.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,13(1):51-56.
吕林素,毛景文,周振华,等.2012.吉林红旗岭1号和7号岩体中含矿超镁铁质岩的矿物化学特征:对岩浆演化过程以及铜镍硫化物矿床形成机制的约束[J].岩石学报.28(1):319-344.
莫宣学,罗照华,邓晋福,等.2007.东昆仑造山带花岗岩及地壳生长[J].高校地质学报.13(3):403-414.
孙涛,钱壮志,党新生,等.2010.喀拉通克铜镍矿床硫同位素组成特征及其地质意义[J].地球科学与环境学报.32(4):344-349
汤中立,李小虎.2006.两类岩浆的小岩体成大矿[J].矿床地质,25(增刊):35-38.
汤中立.1995.金川铜镍硫化物(含铂)矿床成矿模式及地质对比[M].北京:地质出版社,35-58.
王秉璋.2011.祁漫塔格地质走廊域古生代-中生代火成岩岩石构造组合研究[D].博士论文,1-228.
王冠,孙丰月,李碧乐,等.2013.东昆仑夏日哈木矿区早泥盆世正长花岗岩锆石U-Pb年代学、地球化学及其动力学意义[J].大地构造与成矿学,37(4):685-697.
邹海洋,戴塔根,胡翔昭.2001.喀拉通克铜镍硫化矿地质特征及找矿预测[J].地质地球化学,29(3):70-75.