内蒙朝克山辉长岩中单斜辉石矿物化学特征及地质意义.pdf

引文格式：张永玲，张治国，刘希军，等.内蒙朝克山辉长岩中单斜辉石矿物化学特征及地质意义J.西北地质，2024，57（1）：122138.DOI：10.12401/j.nwg.2023027Citation：ZHANG Yongling，ZHANG Zhiguo，LIU Xijun，et al.Mineralogical Chemistry Characteristics and Geological Sig-nificance of the Clinopyroxene from Chaokeshan Gabbro,Inner MongoliaJ.Northwestern Geology，2024，57（1）：122138.DOI：10.12401/j.nwg.2023027内蒙朝克山辉长岩中单斜辉石矿物化学特征及地质意义张永玲1，张治国1，*，刘希军2,3，田昊2，李得超2，肖让1，肖尧2（1.河西学院土木工程学院，甘肃 张掖734000；2.桂林理工大学，广西隐伏金属矿产勘查重点实验室，广西有色金属隐伏矿床勘查及材料开发协同创新中心，广西 桂林541004；3.中国科学院新疆生态与地理研究所新疆矿产资源研究中心，新疆 乌鲁木齐830011）摘要：内蒙贺根山带广泛发育古生代基性岩浆岩，为探讨其岩浆源区和岩石成因，进一步了解中亚造山带东段古生代构造背景，笔者对朝克山蛇绿岩进行了矿物学研究。矿物电子探针结果显示，辉长岩中单斜辉石均属于透辉石，既有碱性特征，也有拉斑特征，SiO2含量为 50.75%52.99%，具有高的 Al2O3，含量为 2.03%3.77%，相对亏损轻稀土元素(La/Sm)N=0.120.22 和高场强元素（HFSE；Nb、Ta、Zr、Hf、Ti 负异常），富集大离子亲石元素（LILEs），与辉长岩全岩的特征程度相一致，共同指示岩体母岩浆可能为亚碱性的拉斑玄武质岩浆向碱性玄武质岩浆演化的趋势。单斜辉石的平衡温度为 1 0991 242，平衡压力为 1.56.4 kbar，深度为 521 km，显示明显的深源特征。结合前人研究成果，笔者认为朝克山蛇绿岩形成于弧后盆地环境。关键词：朝克山蛇绿岩；单斜辉石；矿物学；弧后盆地中图分类号：P588.14文献标志码：A文章编号：1009-6248（2024）01-0122-17Mineralogical Chemistry Characteristics and Geological Significance of the Clinopyroxenefrom Chaokeshan Gabbro,Inner MongoliaZHANG Yongling1，ZHANG Zhiguo1，*，LIU Xijun2,3，TIAN Hao2，LI Dechao2，XIAO Rang1，XIAO Yao2（1.College of Civil Engineering,Hexi University,Zhangye 734000,Gansu,China；2.Guangxi Key Laboratory of Hidden Metallic Ore DepositsExploration,College of Earth Sciences,Guilin,University of Technology,Guilin 541004,Guangxi,China；3.Xinjiang Research Center forMineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China）Abstract：Paleozoic mafic magmatic rocks are widely developed in Hegenshan belt of Inner Mongolia.In or-收稿日期：2022-06-20；修回日期：2023-11-05；责任编辑：曹佰迪基金项目：国家自然科学基金（92055208），广西自然科学基金杰出青年科学基金（2018GXNSFFA281009），广西八桂学者项目“有色金属成矿理论与勘查技术”（2018），甘肃省高等学校创新基金项目（2021A-118），广西研究生教育创新计划项目（YCBZ2021063）联合资助。作者简介：张永玲（1977），女，硕士，副教授，主要从事水利工程研究。Email：。*通讯作者：张治国（1991)，男，博士，讲师，主要从事蛇绿岩及构造岩浆作用研究。Email：。第 57 卷 第 1 期西 北 地 质Vol.57No.12024 年（总 233 期）NORTHWESTERN GEOLOGY2024（Sum233）der to explore the magmatic source and petrological genesis of these rocks and to further understand the Paleo-zoic tectonic setting of the eastern part of the Central Asian orogenic belt,the Chaokeshan ophiolites are studiedby mineralogy.Mineral electron probe results show that the monocline in gabbro belongs to diopside,which hasboth alkaline and tholeitic characteristic,with SiO2(50.75%to 52.99%)and high Al2O3(2.03%to 3.77%),andare relatively enriched large ion lithophile elements,but depleted in light rare earth elements (La/Sm)N=0.120.22)and in high field strength elements(e.g.Nb,Ta,Zr,Hf,Ti),consistent with the characteristics of thewhole gabbro rock,indicating that the parent magma of the pluton may be subalkaline tholeitic magma to alka-line basalt magma evolution trend.The temperature and pressure of clinopyroxene are 1 0991 242,1.56.4 kbar and 521 km respectively,suggesting obvious deep-derived characteristics.Combined with theprevious research results,its suggest that the Chaokeshan ophiolites was likely produced in the back-arc tecton-ic setting.Keywords：Chaokeshan ophiolites；clinopyroxene；mineralogy；backarc basin蛇绿岩通常被认为是构造侵位于大陆边缘造山带或陆缘的非原地的上地幔和已消失的古大洋地壳的岩石碎片，它是研究人员研究古洋盆和造山带构造演化、恢复和重建区域地质演化过程的最佳样品（Pearce et al.，1984；臧遇时等，2013；杨剑洲等，2019；Liu et al.，2020，2021）。中 亚 造 山 带（Central AsianOrogenic Belt）是古亚洲洋经历早新元古代的裂解、古生代的俯冲增生拼贴以及晚古生代碰撞闭合造山而 形 成 的 世 界 最 大 的 增 生 型 造 山 带 之 一（图 1a）（Windley et al.，2007；Xiao et al.，2009；张治国等，2019；Zhang et al.，2021；张向飞等，2023）。中亚造山带东段内蒙古造山带内部发育多条不连续的 NENEE 110E华北板块翁牛特西拉木伦河林西交其尔-锡林浩特带苏尼左旗苏尼右旗索伦-林西带 温都尔庙-西拉木伦带 贺根山朝克山锡林浩特西乌珠木沁东乌珠木沁温都尔庙200 km0N华北克拉通塔里木克拉通东欧克拉通西伯利亚克拉通中亚造山带b内蒙ba中生界及第四系上二叠统石炭系下二叠统泥盆系寒武系志留系变质杂岩蛇绿岩古生代花岗岩断裂带研究区二连浩特二连浩特-贺根山带图1中亚造山带主要构造单元构造图（a）及研究区大地构造位置示意图（b）（据王树庆等，2008）Fig.1(a)Tectonic map of the main tectonic units of the Central Asian Orogenic Belt and(b)Geological map showing the tectonic units of study area第 1 期张永玲等：内蒙朝克山辉长岩中单斜辉石矿物化学特征及地质意义123 向蛇绿岩带、从北向南依次为二连浩特贺根山蛇绿岩带、交其尔锡林浩特蛇绿岩带、索伦林西蛇绿岩带和温都尔庙蛇绿岩带（图 1b）（张旗等，2001；Miao et al.，2008；党智财等，2022）。最北部的二连浩特贺根山蛇绿岩带普遍被认为是华北板块和西伯利亚板块最后碰撞的缝合线向东延伸的部分（Miaoet al.，2008；黄波等，2016），但该蛇绿岩带形成环境争议较大，主要观点有洋中脊成因（包志伟等，1994；Nozaka et al.，2002）和俯冲带成因（洋内弧后盆地和岛弧边缘盆地）（Li，2006；Miao et al.，2008；王成等，2018）。前人亦对贺根山蛇绿岩带的镁铁质岩的岩体野外地质特征、岩石学及岩石地球化学特征开展了大量研究（Miao et al.，2008；Jian et al.，2012；Wang etal.，2020；黄波等，2021），但对镁铁质岩石的矿物学工作还鲜有涉及。单斜辉石是超镁铁质镁铁质岩体中较为常见的造岩矿物，其化学成分记录了岩浆成因、岩浆物理化学条件以及岩浆形成的构造环境等多方面的重要信息（Nisbet et al.，1977；邱家骧，1987；白志民，2000；鄢全树等，2007；闫纪元等，2014），因而单斜辉石是研究超镁铁质镁铁质岩体成因的重要物质？笔者对内蒙地区朝克山蛇绿岩中辉长岩中单斜辉石开展了系统的矿物学和矿物地球化学研究，旨在揭示该辉长岩的单斜辉石矿物化学特征，约束其岩浆性质、演化过程及其物理化学条件，探讨其岩石所属系列和成因特征，为朝克山蛇绿岩的成因提供约束。1地质背景和样品来源朝克山蛇绿岩地处中亚造山带东段的内蒙大兴安岭造山带，属于二连浩特贺根山蛇绿岩带的一部分（图 1b）。朝克山蛇绿岩带出露面积约为 100 km2，以构造混杂状产出为主，岩石层序不完整，主要由蛇纹石化的超镁铁质岩、火成堆晶结构的块状辉长岩、辉绿岩墙及深海沉积物等组成。围岩主要为晚侏罗世早白垩世的基性和酸性火山岩、二叠纪白垩纪基性和中酸性侵入体（黄波等，2021）。蛇绿岩单元由蛇纹石化方辉橄榄岩、二辉橄榄岩、层状和块状辉长岩、辉绿岩、辉绿岩墙（脉）、斜长花岗岩、基性熔岩和硅质岩组成（图 2、图 3a、图 3b）。变质沉积岩玄武岩辉长岩超基性岩采样点新生代沉积物N02 kmCKS-08-06CKS-08-01CKS-08-02CKS-08-04图2朝克山地区地质简图（据王树庆等，2008）Fig.2Geological sketch of the Chaokeshan region 文中辉长岩样品采集于朝克山西南及北部。辉长岩呈辉长结构，交代假象结构，块状构造。主要造岩矿物为辉石、斜长石、角闪石、黑云母、磁铁矿、钛铁矿和磷灰石等，蚀变矿物为绢云母、绿帘石、绿泥石（Chl）等组成（图 3c图 3f）。辉石呈自形、柱状，无色，辉石解理，主要为单斜辉石中的普通辉石，解理弯曲变形，主要粒径为 0.52 mm，含量约为 30%。斜长石呈半自形、柱状，强烈的蚀变为高岭石、方柱石等矿物的集合体，轻微的蚀变为绢云母化、绿帘石化，与辉石呈辉长结构、嵌晶含长结构，主要粒径为0.2124西北地质NORTHWESTERN GEOLOGY2024 年2 mm，部分粒径为 25 mm，含量约为 55%。角闪石呈自形，柱状，浅绿-褐色，闪石解理，部分在辉石边部呈反应边，粒径为 0.22 mm，部分粒径为 25 mm，含量约为 12%。黑云母呈他形、片状，强烈的绿泥石化，保留其特征残留，粒径为 0.20.5 mm，含量约为2%。副矿物主要为磁铁矿、钛铁矿，磷灰石等，粒径为 0.11 mm。在电子背散射图像中，单斜辉石颗粒具有无环带的特征（图 3g图 3h）。2分析方法矿物主量元素分析、原位微量元素分析，以及全岩样品的主量元素分析均在桂林理工大学广西隐伏金属矿产勘查重点实验室完成。2.1电子探针单矿物主量元素分析矿物主量元素分析所用的仪器为：JEOLJXA8230型电子探针（EPMA）。分析前用透反射偏光显微镜（NIKONECLIPSE50iPOL）镜观察电子探针片并标记待分析的矿物颗粒。仪器分析条件为：加速电压为15 kV，束流为 20 nA，束斑直径为 5 m，使用 ZAF 法校正处理。矿物主量元素的详细操作流程以及分析方法参见 Huang 等（2007）。2.2单矿物原位微量元素分析原位微量元素分析所用的的仪器为：ICPMS 为Agilent 7 500 型四级杆质谱仪。进样系统为 GeoLasHD 193 nm ArF 准分子激光剥蚀系统。测试分析方法同单矿物锆石 LAICP MS 锆石 UPb 定年，矿物微量元素的详细操作流程以及分析方法参见 Liu 等（2010）。3地球化学特征 3.1矿物主量元素朝克山辉长岩中单斜辉石电子探针分析结果见表 1。朝克山单斜辉石 SiO2含量为 50.75%52.99%，TiO2含 量 为 0.27%0.86%，FeO*含 量 为 5.08%9.69%，MgO 含 量 为 13.13%15.81%，Mg#值 为 7184（Mg#=molar Mg/Mg+Fe2+100；Mg 和 Fe2+均为原 子 数），Na2O 含 量 为 0.26%0.43%，CaO 含 量 为21.50%24.39%和 Al2O3含 量 为 2.03%3.77%。根据 Morimoto（1988）提出的辉石分类命名方案，朝克山单斜辉石均位于 Q-J 图解（Q=Ca+Mg+Fe2+，J=2Na+）的Ca-Mg-Fe 区域内（图 4a）。它们的 En（100 Mg/Mg+Ca+Fe）、Wo（100 Ca/Mg+Ca+Fe）和 Fs（100 Fe/Mg+Ca+Fe）（各元素均为原子数）值分别为3945、4551 和 816，在 En-Wo-Fs 三元图解中落在透辉石范围内（图 4b）。3.2矿物微量元素朝克山辉长岩中单斜辉石微量结果见表 2。稀土总含量（REE 含量）为 53.5310-694.8310-6，稀土元素球粒陨石标准化 REE 配分模式（图 5a）表现为轻稀土元素亏损（La/SmN=0.120.22），重稀土元素平坦（Gd/YbN=0.831.33），无 明 显 Eu 异 常（Eu/Eu*=EuN/LaN*SmN1/2=0.781.09），表明原始岩浆在演化过程中经历了程度微弱的斜长石分离结晶作用。在原始地幔标准化微量元素蛛网图中（图 5b），所有样品显示大离子亲石元素（LILE）相对富集，高场强元素（HFSE）Nb、Ta、Zr、Hf、Ti 相对亏损，与俯冲带岩浆 CpxCpxdcabghfe0.12 mmPlPlPxPxPxPxChlChlChlChlHblHblHblScpHbl0.12 mm0.12 mm0.12 mm500 m50 mPl.斜长石；Cpx.单斜辉石；Hbl.角闪石；Chl.绿泥石图3朝克山地区辉长岩的野外露头（ab）、显微照片（df）及单斜辉石环带结构背散电子图（gh）Fig.3(ab)Outcrop images,(df)Representative photomicro-graphs and(gh)the backscattered electronicimages of theclinopyroxenes ringband structure of the Chaokeshan gabbro第 1 期张永玲等：内蒙朝克山辉长岩中单斜辉石矿物化学特征及地质意义125 表 1 朝克山辉长岩的单斜辉石的主量元素组成分析结果表（%）Tab.1Major element compositions(%)of clinopyroxene in Chaokeshan gabbro样品CKS-08-01-1CKS-08-01-2CKS-08-01-3CKS-08-01-4CKS-08-01-5CKS-08-01-6CKS-08-01-7CKS-08-01-8CKS-08-01-9CKS-08-01-10SiO252.3552.5752.3452.6552.3452.6252.6151.8652.1652.30TiO20.610.500.690.760.460.620.720.690.610.52Al2O32.622.512.762.642.652.622.612.702.702.90Cr2O30.370.280.380.390.350.350.360.380.380.38FeO*5.926.426.206.155.896.075.956.205.865.73MnO0.190.200.200.160.170.180.170.180.190.15MgO13.6914.1213.7913.6913.6813.8013.9014.0113.8113.98CaO23.9223.5923.8724.0524.2324.0424.1224.0023.9524.03Na2O0.370.360.390.370.310.380.360.400.400.36K2O0.000.000.000.000.010.000.000.000.010.00Toal100.03100.55100.62100.84100.08100.67100.80100.43100.06100.34Si1.9371.9371.9281.9341.9361.9351.9321.9171.9301.927Al0.0630.0630.0720.0660.0640.0650.0680.0830.0700.073Al0.0510.0460.0480.0480.0520.0490.0450.0350.0480.053Ti0.0170.0140.0190.0210.0130.0170.0200.0190.0170.015Cr0.0110.0080.0110.0110.0100.0100.0110.0110.0110.011Fe2+0.1830.1980.1910.1890.1820.1870.1830.1920.1810.176Mn0.0060.0060.0060.0050.0050.0050.0050.0060.0060.005Mg0.7550.7750.7570.7500.7540.7560.7610.7720.7620.768Ca0.9480.9310.9420.9460.9600.9470.9490.9500.9490.949Na0.0260.0260.0280.0260.0220.0270.0250.0290.0290.026Mg#80.4679.6979.8679.8980.5480.2280.6580.1180.7981.32Fs9.7210.3810.1110.029.619.879.6510.029.579.32En40.0240.7240.0639.7839.7740.0240.2140.3440.2640.56Wo50.2648.9049.8350.2150.6250.1250.1349.6450.1650.12样品CKS-08-01-11CKS-08-01-12CKS-08-01-13CKS-08-01-14CKS-08-01-15CKS-08-02-1CKS-08-02-2CKS-08-02-3CKS-08-02-4CKS-08-02-5SiO252.2952.4252.2352.7252.0052.0252.8652.4652.3852.99TiO20.770.780.750.570.510.530.650.670.640.62Al2O32.822.682.672.592.402.682.492.502.642.31Cr2O30.400.380.330.350.410.270.240.230.310.24FeO*5.936.105.705.736.335.986.446.486.045.81MnO0.160.190.190.170.210.210.170.200.180.21MgO13.9513.9813.8513.7814.2513.6314.1214.1314.3014.10CaO24.0323.6124.3924.3823.5523.7323.7423.3123.1424.17Na2O0.370.350.350.290.360.300.340.340.350.33K2O0.000.000.000.000.000.000.010.000.000.00Toal100.71100.48100.46100.58100.0299.35101.05100.3299.97100.79Si1.9231.9301.9261.9391.9291.9371.9371.9361.9351.944Al0.0770.0700.0740.0610.0710.0630.0630.0640.0650.056Toal100.71100.48100.46100.58100.0299.35101.05100.3299.97100.79Si1.9231.9301.9261.9391.9291.9371.9371.9361.9351.944Al0.0770.0700.0740.0610.0710.0630.0630.0640.0650.056126西北地质NORTHWESTERN GEOLOGY2024 年 续表1样品CKS-08-01-11CKS-08-01-12CKS-08-01-13CKS-08-01-14CKS-08-01-15CKS-08-02-1CKS-08-02-2CKS-08-02-3CKS-08-02-4CKS-08-02-5Al0.0450.0470.0420.0510.0330.0550.0450.0450.0500.044Ti0.0210.0210.0210.0160.0140.0150.0180.0190.0180.017Cr0.0120.0110.0100.0100.0120.0080.0070.0070.0090.007Fe2+0.1820.1880.1760.1760.1960.1860.1970.2000.1870.178Mn0.0050.0060.0060.0050.0070.0060.0050.0060.0060.007Mg0.7650.7670.7610.7550.7880.7570.7710.7770.7880.771Ca0.9470.9310.9640.9600.9360.9470.9320.9220.9160.950Na0.0270.0250.0250.0200.0260.0220.0240.0240.0250.024Mg#80.7580.3481.2481.0980.0680.2579.6379.5580.8481.22Fs9.639.969.259.3110.229.8610.3810.539.879.39En40.3940.6740.0539.9341.0440.0440.5840.9441.6740.59Wo49.9849.3750.7050.7648.7450.1049.0448.5448.4650.02样品CKS-08-02-6CKS-08-02-7CKS-08-02-8CKS-08-02-9CKS-08-02-10CKS-08-02-11CKS-08-02-12CKS-08-02-13CKS-08-02-14CKS-08-02-15SiO252.5452.4952.1252.4252.7952.4951.9252.7552.9152.74TiO20.600.540.770.600.560.570.570.510.470.51Al2O32.462.032.492.312.562.682.832.392.542.59Cr2O30.240.280.270.250.420.360.290.280.200.27FeO*5.705.935.806.245.975.885.705.785.875.96MnO0.180.190.190.190.190.170.160.190.190.18MgO14.3014.1014.2614.8313.9914.0613.9013.9113.7513.90CaO23.9923.8423.6022.9123.7623.8523.9823.7423.9324.02Na2O0.300.290.280.310.370.380.310.320.360.35K2O0.010.000.000.010.010.000.010.010.010.00Toal100.3199.6999.78100.07100.61100.4499.6899.86100.24100.52Si1.9361.9481.9311.9361.9401.9331.9271.9501.9501.940Al0.0640.0520.0690.0640.0600.0670.0730.0500.0500.060Al0.0430.0370.0400.0370.0510.0490.0510.0540.0600.053Ti0.0170.0150.0210.0170.0150.0160.0160.0140.0130.014Cr0.0070.0080.0080.0070.0120.0110.0090.0080.0060.008Fe2+0.1760.1840.1800.1930.1840.1810.1770.1790.1810.183Mn0.0050.0060.0060.0060.0060.0050.0050.0060.0060.006Mg0.7860.7800.7870.8160.7670.7720.7690.7670.7550.762Ca0.9470.9480.9370.9060.9350.9410.9530.9400.9450.947Na0.0210.0210.0200.0220.0260.0270.0230.0230.0260.025Mg#81.7380.9281.4180.9080.6880.9981.3081.1180.6880.60Fs9.219.629.4410.069.739.569.319.479.629.70En41.1740.8141.3542.6240.6540.7440.5040.6640.1540.28Wo49.6349.5749.2147.3249.6149.6950.1949.8750.2350.02第 1 期张永玲等：内蒙朝克山辉长岩中单斜辉石矿物化学特征及地质意义127 续表1样品CKS-08-02-16CKS-08-02-17CKS-08-04-1CKS-08-04-2CKS-08-04-3CKS-08-04-4CKS-08-04-5CKS-08-04-6CKS-08-04-7CKS-08-04-8SiO252.3252.5452.9152.7351.9952.0451.6752.2552.0451.57TiO20.580.740.450.430.600.760.590.510.510.56Al2O32.532.822.442.382.742.752.882.402.262.67Cr2O30.210.230.480.420.410.500.450.410.380.50FeO*5.975.885.485.725.335.335.575.175.925.33MnO0.200.200.170.180.160.150.170.150.170.15MgO13.7613.8415.1115.3615.4115.3915.6515.2515.5615.18CaO24.1224.0923.5223.2823.9123.3523.3023.0123.0923.95Na2O0.400.370.380.420.310.320.340.300.350.32K2O0.000.000.000.020.000.020.000.010.000.00Toal100.09100.70100.93100.94100.87100.60100.6199.45100.27100.23Si1.9361.9301.9341.9291.9061.9091.8991.9341.9201.904Al0.0640.0700.0660.0710.0940.0910.1010.0660.0800.096Al0.0460.0520.0390.0320.0240.0280.0240.0390.0180.020Ti0.0160.0200.0120.0120.0170.0210.0160.0140.0140.016Cr0.0060.0070.0140.0120.0120.0140.0130.0120.0110.015Fe2+0.1850.1810.1670.1750.1630.1640.1710.1600.1830.165Mn0.0060.0060.0050.0060.0050.0050.0050.0050.0050.005Mg0.7590.7580.8230.8380.8420.8420.8570.8410.8560.836Ca0.9560.9480.9210.9120.9390.9180.9170.9120.9120.948Na0.0290.0270.0270.0290.0220.0220.0240.0210.0250.023Mg#80.4280.7683.1082.7283.7683.7383.3684.0282.4083.55Fs9.729.578.769.098.408.518.808.369.378.45En39.9540.1743.0743.5243.3243.7744.0643.9743.8742.90Wo50.3350.2648.1747.4048.2947.7247.1447.6746.7748.65样品CKS-08-04-8CKS-08-04-10CKS-08-04-11CKS-08-04-12CKS-08-04-13CKS-08-04-14CKS-08-06-1CKS-08-06-2CKS-08-06-3CKS-08-06-4SiO251.9252.0851.9752.5052.4051.7651.2051.2950.7551.80TiO20.560.380.530.780.520.650.670.680.270.42Al2O32.552.402.972.852.792.642.842.853.223.30Cr2O30.410.380.350.480.430.420.010.010.030.11FeO*5.085.636.125.675.505.599.149.139.697.16MnO0.170.180.200.210.190.150.120.220.290.18MgO15.3615.5215.8114.9915.1415.6613.1413.7413.1314.28CaO23.7123.5222.0023.0423.0722.8621.5321.5221.5322.40Na2O0.330.330.330.350.360.290.390.390.380.31K2O0.000.000.010.010.000.000.000.000.000.01Toal100.10100.41100.28100.88100.39100.0299.0399.8299.2999.97Si1.9151.9181.9111.9201.9241.9101.9301.9191.9151.919Al0.0850.0820.0890.0800.0760.0900.0700.0810.0850.081Al0.0260.0220.0400.0430.0450.0250.0560.0440.0590.063128西北地质NORTHWESTERN GEOLOGY2024 年 续表1样品CKS-08-04-8CKS-08-04-10CKS-08-04-11CKS-08-04-12CKS-08-04-13CKS-08-04-14CKS-08-06-1CKS-08-06-2CKS-08-06-3CKS-08-06-4Ti0.0150.0110.0150.0220.0140.0180.0190.0190.0080.012Cr0.0120.0110.0100.0140.0130.0120.0000.0000.0010.003Fe2+0.1570.1730.1880.1730.1690.1730.2880.2860.3060.222Mn0.0050.0060.0060.0070.0060.0050.0040.0070.0090.006Mg0.8450.8520.8670.8170.8290.8620.7380.7670.7380.789Ca0.9370.9280.8670.9030.9080.9040.8690.8630.8700.889Na0.0240.0230.0230.0250.0250.0210.0280.0280.0280.023Mg#84.3483.0882.1782.5083.0883.3271.9272.8670.7278.06Fs8.098.889.799.158.868.9015.2014.9215.9711.67En43.5843.6145.1143.1643.4944.4638.9440.0438.5741.52Wo48.3447.5145.1047.6847.6546.6445.8645.0545.4646.81样品CKS-08-06-5CKS-08-06-6CKS-08-06-7CKS-08-06-8CKS-08-06-9CKS-08-06-10CKS-08-06-11CKS-08-06-12CKS-08-06-13CKS-08-06-14SiO251.3450.9552.1851.9552.1850.9952.0351.4151.5051.50TiO20.790.540.470.590.490.830.640.860.660.75Al2O33.323.773.092.993.173.582.742.783.363.52Cr2O30.070.090.130.130.220.130.030.020.020.10FeO*7.936.135.695.666.038.458.689.528.147.15MnO0.210.180.160.140.180.200.200.230.210.18MgO13.8414.5014.8214.7915.1113.4513.8413.3214.0214.37CaO21.8622.0522.3822.5522.3221.8821