西大别红安岩群含磷岩系的形成时代及物源分析_刘浩.pdf

西大别红安岩群含磷岩系的形成时代及物源分析刘浩1,2，徐扬1,3，张维峰1,3，徐大良1,3，魏运许1,3，邓新1,3，金鑫镖1,3，彭练红1LIU Hao1,2,XU Yang1,3,ZHANG Wei-Feng1,3,XU Da-Liang1,3,WEI Yun-Xu1,3,DENG Xin1,3，JIN Xin-Biao1,3,PENG Lian-Hong11.中国地质调查局武汉地质调查中心（中南地质科技创新中心），湖北 武汉 430205；2.古生物与地质环境演化湖北省重点实验室，湖北 武汉 430205；3.中国地质调查局花岗岩成岩成矿地质研究中心，湖北 武汉 4302051.Wuhan Center,China Geological Survey(Geosciences Innovation Center of Central South China),Wuhan 430205,Hubei,China;2.Hubei Key Laboratory of Paleontology and Geological Environmental Evolution,Wuhan 430205,Hubei,China;3.Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey,Wuhan 430205,Hubei,China摘要：西大别红安岩群含磷岩系赋存有我国最大的磷灰石变质矿床，其时代约束可以为红安岩群层序划分、黄麦岭岩组与扬子陆块陡山沱组对比提供重要依据。通过岩石学及LA-ICP-MS锆石U-Pb同位素测年，在黄麦岭岩组中的浅粒岩和磷矿石中获得640 Ma、730 Ma、760 Ma、810 Ma、2017 Ma五组较集中的碎屑锆石U-Pb年龄和零星的2476 Ma和2700 Ma年龄。碎屑锆石最小年龄61613Ma约束了黄麦岭岩组的最大沉积年龄，表明黄麦岭岩组为红安岩群最晚期沉积，推测黄麦岭岩组沉积时代与陡山沱组相当或晚于后者。样品碎屑锆石磨圆度差，且年龄谱系与西大别地区的岩浆活动一致，推测西大别地区为黄麦岭岩组的物源区。关键词：红安岩群；黄麦岭岩组；变质磷矿；时代及物源；西大别中图分类号：P597；P619.21+3文献标识码：A文章编号：2097-0013（2023）02-0278-14Liu H,Xu Y,Zhang W F,Xu D L,Wei Y X,Deng X,Jin X B and Peng L H.2023.SedimentaryAge and Provenance of Phosphorous-containing Rocks in Hongan Group in the Western Dabie Area.South China Geology,39(2):278-291.Abstract:The phosphorous-containing deposit in the western Dabie area is the largest metamorphic apatitedeposit in China，deposit time of which is the key to reveal the sequence of Hong an Group and the contrastbetween the Huangmailing Formation in Dabie and the Doushantuo Formation in the Yangtze block.Throughpetrology and LA-ICP-MS zircon U-Pb dating，the peak ages of 640 Ma，730 Ma，760 Ma，810 Ma，2017 Ma and sporadic ages of 2476 Ma and 2700 Ma were obtained in the leptites and phosphate ores.The minimum age of clastic zircons is 616 13Ma，which limits the maximum sedimentary age of the Huang-mailing Formation.It is speculated that the Huangmailing Formation is equivalent or later than that of theDoushantuo Formation,and it is the latest deposit in the Hong an Group.The age spectrum of the sample isconsistent with the magma activities in the western Dabie along with the poor round shape of the zircons，which indicates that western Dabie area is the provenance area of these phosphrous rocks.收稿日期：2023-3-15；修回日期：2023-4-17基金项目：古生物与地质环境演化湖北省重点实验室开放研究基金（PEL202113）、中国地质调查局花岗岩成岩成矿地质研究中心开放基金（PM202307）、中国商务部对外援助项目（202128）第一作者：刘浩（1984），男，高级工程师，从事基础地质调查与地层学方向的研究，E-mail：第39卷 第2期2023年6月华 南 地 质South China GeologyVol.39,No.2,278-291Jun.,2023doi:10.3969/j.issn.2097-0013.2023.02.007第39卷 第2期新元古代-早古生代是全球性海相含磷岩系大规模沉积时期，在华南地区主要表现为扬子陆块埃迪卡拉纪-寒武纪的沉积胶磷矿床，以及大别磷灰石型磷矿床。沉积型胶磷矿床赋存的地层主要有埃迪卡拉纪早期的陡山沱组（肖朝益等，2018；ZhangY D et al.，2019）和寒武纪早期的湘西牛蹄塘组和滇东梅树村组（黄燕，2011；徐林刚等，2013），前人对磷矿形成时代、矿床成因、岩相古地理、物源、成矿模式等开展了详细和深入的研究，积累了大量研究成果（密文天，2010；叶杰，2022）。变质磷灰石型磷矿床包括自西大别黄麦岭磷矿经蕲春至安徽宿松、肥东直达苏北海州等的一系列矿床，其形成经历了沉积、变质和改造作用（邓乾忠和王昌平，2006；李双喜等，2022）。因大别地区的地层经过了印支期大陆俯冲-高压/超高压变质-折返的复杂变质变形作用（毛新武等，2016），构造变形强烈、地层经过强烈改造等原因，对大别变质型磷矿的研究相比沉积型胶磷矿显得较为薄弱。西大别红安-大别地区发育一套总体呈北西向展布的、遭受绿帘角闪岩相区域变质的沉积-火山沉积岩系，被命名为红安岩群，其可进一步分为天台山岩组、七角山岩组和黄麦岭岩组（邓乾忠等，2013；牛志军等，2022），三者之间为构造接触。其中黄麦岭岩组因其为我国最大的含磷灰石型变质磷矿床的赋存层位而备受关注。红安群的层序和时代是一个长期存在争议的问题，而黄麦岭含磷岩系的形成时代则是这些争议的焦点。层序上的分歧主要为黄麦岭岩组是红安岩群最早期沉积还是晚期沉积，是位于红安岩群的顶部还是底部的问题（湖北省地质矿产局，1996），而沉积时代的观点有中元古代还是震旦纪之争（汤加富等，2002；李酉兴和张素兴，2006）。长期以来，黄麦岭含磷岩系的沉积时代因缺乏精确的年代地层学研究一直未能精确限定，导致其区域地层对比关系的研究缺乏直接证据。前人根据黄麦岭岩组与陡山沱岩组均含有丰富的磷资源，认为两者可以进行对比（汤加富等，2002），或者就是同物异名（湖北省地质调查院1 25万麻城幅项目组，2001）。也有一些学者认为这种观点虽然有一定的合理性，但是缺乏明确的证据且不严谨，对这种对比关系提出了质疑，认为两者是不同时期不同成因的产物（湖北省地质矿产局，1996；邓乾忠和王昌平，2006；邓乾忠等，2013）。本文对西大别大磊山南、北两翼黄麦岭含磷岩系中的碎屑锆石开展了系统的内部结构、微量元素组成、U-Pb定年分析，以对含磷岩系的时代提供进一步约束，通过碎屑锆石的年龄结构分析，结合大别及扬子的构造岩浆事件，探讨这套含磷岩系的物质来源，并开展与扬子陆块陡山沱组的对比工作。1 区域地质背景大别-苏鲁造山带为印支期华南板块向华北板块碰撞造山形成的造山带。西大别地块位于大别-苏鲁造山带的西缘，西侧以大悟断裂与桐柏地区相邻，东侧以团风-麻城断裂与东大别分隔，北侧和南侧分别以龟山-梅山断裂和襄樊-广济断裂与华北南缘和扬子北缘相分界，形态上呈一个楔形体。Wu Y B and Zheng Y F（2013）将西大别造山带自北向南分为6个岩石构造单元：南缘复理石建造、八里畈混杂岩带、浒湾高压榴辉岩带、新县超高压榴辉岩带、红安高压榴辉岩带和木兰山绿片岩带。西大别出露的地层主要为前寒武纪沉积-火山岩，在印支期从南到北经历了从蓝片岩相、绿片岩相到绿帘角闪岩相的低温高压变质作用，这期高压变质事件的改造对识别红安群变质地层的原始沉积层序造成了巨大困难（刘晓春等，2005）。近期出版的 中国区域地质志湖北志 将红安岩群分为天台山岩组、七角山岩组和黄麦岭岩组。天台山岩组为白云钠长（石英）片岩、钠长浅粒岩、白云钠长（二长）变粒岩、含石榴石白云钠长片麻岩、二云二长片麻岩及石英二云片岩、白云石英片岩，原岩为中酸性火山岩、熔岩、火山碎屑岩夹陆缘碎屑岩。七角山岩组为白云钠长片麻岩、白云钠长变粒岩、钾长浅Key words:Hong an Group;Huangmailing Formation;metamorphic phosphate;sedimentary age and prove-nance;Western Dabie刘浩等：西大别红安岩群含磷岩系的形成时代及物源分析279华 南 地 质2023 年粒岩、白云石英片岩、斜长角闪岩夹白云母（石英）片岩、黑云斜长片岩、含榴钠长角闪岩，原岩为双峰式火山岩及陆缘碎屑岩。黄麦岭岩组主要岩石组合为白云钠长片麻岩、石英片岩、钠长角闪片岩、微斜钠长变粒岩或浅粒岩、含锰大理岩、石墨片岩、石英岩、磷灰岩和锰土矿组合，总体上为正常碳酸盐岩-碎屑岩沉积夹火山岩、火山碎屑岩（湖北省地质调查院，2021）。黄麦岭含磷岩系环绕着大磊山岩体发育，外围为天台山岩组，现今表现为一椭圆形穹窿构造（图1）。穹窿核部为大磊山片麻状花岗岩，片麻理总体向东倾斜，岩石类型包括白云二长片麻岩、二云二长片麻岩、黑云二长片麻岩、白云钾长片麻岩，形成时代为800 Ma（徐扬，2017），另可见一些形成时代为1970 Ma的闪长岩和440 Ma的基性侵入岩（Xu Y et al.，2020；金鑫镖等，2022）。图1 西大别大磊山地区大地构造位置（a）及地质简图（b）Fig.1 Tectonic location of Daleishan area in the western Dabie belt(a)and simplified geological map(b)2 样品采集及岩相学特征样品D19采自大磊山岩体北缘一小型磷矿中，点上GPS坐标为1141154.07E、313029.34N，此处黄麦岭岩组岩性组合为含锰片岩、含磷浅粒岩和大理岩（图2a）。磷矿石已被开采完毕，矿洞也已掩埋。所采的样品为与磷矿层伴生的浅粒岩（图2b）。经薄片鉴定，样品呈鳞片粒状变晶结构，石英含量约为 50%，粒径 0.1 0.5 mm；斜长石含量约为25%，粒径0.3 0.5 mm；白云母含量15%20%，粒径0.5 3.5 mm，还可见赤铁矿、绿帘石、锆石等副矿物（图2c）。样品pm301-8采自湖北省大悟县城以南13 km280第39卷 第2期的黄麦岭磷矿中，位于大磊山岩体南缘（图1），点上GPS坐标为114750.82E、31282.11N。该处黄麦岭岩组的岩性组合为白云钠长变粒岩、浅粒岩、石墨片岩、大理岩和含磷变粒岩（图2d），与下伏的大磊山岩体和上覆的花岗质岩石均为断层接触。所采样品为矿山重点采集的具有明暗相间纹层的磷矿石（图2e）。经镜下鉴定，样品具有鳞片粒状变晶结构，条带状构造，磷灰石含量约35%，粒径0.3 2 mm；斜长石含量约30%，粒径0.5 1.5 mm；石英含量约 20%，粒径 0.5 1.5 mm；白云母含量约15%，粒径0.5 2 mm；另可见少量的方解石、绿帘石、锆石等副矿物（图2f）。图2 黄麦岭岩组岩石样品的野外和镜下照片Fig.2 Representative field and micrograph photos for the samples of Huangmailing FormationQz-石英，Mus-白云母，Ap-磷灰石，Pl-斜长石，Ab-钠长石3 样品分析方法所采样品的锆石分选在河北省廊坊市宇能（宇恒）矿物分选综合实验室完成。在双目镜下，在分选出的锆石中选择晶形完好、透明度较好且未蚀变的的颗粒粘至环氧树脂进行制靶，打磨至锆石中心部位后抛光，随后进行透射光、反射光和阴极发光刘浩等：西大别红安岩群含磷岩系的形成时代及物源分析281华 南 地 质2023 年（CL）照相。CL照相是在发射扫描电镜MIRA3上进行，扫描时间为2 min，电压为7 kV。锆石的制靶和照相工作由武汉上谱分析科技有限责任公司完成。参考锆石的透射光、反射光和阴极发光的图像特征，选择环带结构发育好、裂隙较少的锆石颗粒，进行锆石U-Pb年龄测定。锆石U-Pb年龄分析是在中国地质调查局武汉地质调查中心同位素地球化学研究室的RESOlu-tion LR 193 nm激光剥蚀系统与ICAP-Q电感耦合等离子体质谱仪的联用装置（LA-ICP-MS）上完成。实验中采用常规激光束斑为29 m，剥蚀时间为45 s，激光频率为3 Hz，激光能量为4 J/cm2。测定时采用国际锆石标准91500作为外部标准进行同位素分馏校正，锆石微量元素含量采用NIST610作为外部标准，29Si作为内标进行定量计算。单个数据点误差为 1，锆石 U-Pb 同位素组成原始数据采用ICPMSDataCal软件（Ver.10.9）（Liu Y S et al.，2008）进行处理。锆石年龄计算以及谐和图的绘制均采用ISOPlot软件（Ludwig，2003）完成。4 分析结果样品D19 和 PM301-8 中分选出的锆石为无色至淡黄色，形态上呈次圆状-次棱角状，磨圆度较差，表明锆石未经过长距离的搬运，部分锆石较破碎，少量锆石发育溶蚀边。锆石颗粒之间显示出明显的明暗程度差异，反应它们之间 Th 和U 的含量明显不同（吴元保和郑永飞，2004）。两个样品的锆石总体情况也存在差异，D19样品粒径多在 80120 m 之间，而 pm301-8 样品中锆石粒径稍小，多在50100 m之间（图3）。D19的锆石绝大多数振荡环带发育，pm301-8 大多数锆石振荡环带清晰，少量无环带或发育弱环带，表明锆石来源比较复杂。D19 和 pm301-8 的锆石颗粒的增生边均呈暗色，表明岩石形成后经过了变质作用的改造，但前者增生边宽度多小于 10m，而后者多大于10 m。锆石LA-ICP-MS测年数据见表1。图3 黄麦岭岩组典型锆石阴极发光照片和测点年龄值Fig.3 Cathodoluminescence images from representative zicon grains and ages of measuring points圆圈所示位置为U-Pb年龄测试位置表1 黄麦岭岩组LA-ICP-MS锆石U-Pb测年结果Table 1 LA-ICP-MS zircon U-Pb analysis result of the Huangmailing FormationD19(浅粒岩)1236376.9189.5139.068.9218.4203.4157.079.01.730.930.890.870.06020.06340.06370.06490.00220.00280.00320.00350.85830.91981.05631.13260.03740.03840.05500.06390.10200.10520.11940.12530.00230.00160.00180.002260972273377279.6289.81101.69112.9662966273276920.4420.2927.1830.4262664572776113.419.2410.3012.4399979998测点号Th(10-6)UTh/U同位素比值207Pb/206Pb207Pb/235U206Pb/238U年龄值(Ma)207Pb/206Pb207Pb/235U206Pb/238U谐和度(%)282第39卷 第2期7810111213141516171920212223242526272829303132333435363738394041424344454648495051525354270.1135.0184.4166.5258.5104.1173.2226.3306.2213.6173.1191.581.5140.1253.4161.6131.195.0123.6172.1192.3334.0146.493.4117.5105.6149.3109.2108.2140.962.3368.5102.6214.4173.7204.0124.3187.9140.6107.574.7190.6144.7119.8139.0177.8147.154.983.6117.8116.5163.8183.2133.6119.1162.3114.389.4246.777.552.8154.676.5159.4138.4109.7118.9154.2100.6142.6134.4154.9160.467.7149.8123.4101.5103.8202.4153.295.8157.2132.0145.974.661.9109.1156.3141.490.71.520.923.361.992.190.891.061.242.291.791.071.680.910.573.273.060.851.240.781.241.752.810.950.930.820.790.960.681.600.940.503.630.991.061.132.130.791.420.961.441.211.750.930.851.530.06540.06580.06570.06570.06300.06500.06510.06710.06650.06740.06500.12560.06420.06680.06680.06740.06670.06380.06420.06690.06400.06530.06560.06600.06260.06630.06520.06610.06440.06450.06530.06810.06640.06470.06420.06680.06460.06470.06660.06670.06450.12630.06690.06730.06460.00230.00230.00390.00310.00270.00270.00250.00220.00340.00260.00330.00490.00400.00200.00380.00430.00270.00360.00220.00270.00250.00280.00280.00300.00270.00340.00270.00330.00330.00270.00270.00280.00430.00220.00220.00280.00400.00320.00230.00380.00690.00370.00250.00320.00291.18981.19121.18051.19211.09841.12311.12711.16721.15261.15491.12376.23161.05681.21541.15621.23651.15941.08391.12001.19431.17461.19291.21231.22881.08671.14111.13241.14711.16501.13071.19771.26281.21121.12771.18391.22901.06551.12431.22381.21561.05286.34091.22941.16451.12890.03970.03880.06820.05470.04960.04770.04260.04020.05800.04360.05780.24570.06490.03670.06350.07480.04940.05510.04100.04840.04700.05150.05090.05600.04780.05740.04630.06310.05460.04910.04870.05130.07360.03880.03970.05060.06320.05620.04360.06480.10940.18920.04450.05620.05060.13250.13230.13170.13250.12500.12520.12580.12560.12610.12510.12580.35920.12040.13220.12590.13380.12510.12580.12550.12930.13270.13220.13370.13370.12540.12440.12580.12530.13260.12590.13220.13380.13280.12520.13390.13400.11910.12500.13280.13320.12070.36210.13320.12520.12530.00160.00180.00250.00240.00160.00160.00180.00160.00210.00160.00230.00530.00250.00160.00220.00240.00170.00260.00160.00180.00170.00180.00190.00200.00160.00170.00190.00310.00190.00170.00170.00180.00210.00160.00180.00200.00180.00170.00170.00210.00320.00450.00160.00200.00197877987987987097747898438228527722039748831831850828744746835743783794809694817783809754767783872820765746831761765833828767204783584876367.5976.0891.6698.1492.5988.8878.5469.60101.6981.48105.5568.36133.3264.04117.43126.8583.33118.5174.0785.9687.9688.8890.7496.2994.43108.4985.18110.18107.4095.3690.8985.18135.1870.3672.9987.81125.76104.4772.22118.51223.9052.0172.07100.0095.217967967927977537647667857787807652009732808780817782746763798789797806814747773769776784768800829806767793814737765812808730202481478476718.4117.9731.7725.3524.0222.8020.3218.8327.3520.5427.6634.5232.0516.8429.9133.9823.2626.8619.6622.4021.9623.8423.3525.5123.2527.2522.0529.8325.6023.4222.5223.0433.8118.5218.4723.0731.0526.8619.9329.7154.1326.2120.2826.3724.12802801798802759761764763765760764197873380176580976076476278480380180980976275676476180376480180980476181081072675980480673519928067607619.3110.1214.1513.749.069.2010.069.2912.029.1113.4525.3314.148.8512.6613.439.7414.849.4210.279.9610.3510.7311.449.159.6411.0217.8010.919.679.5510.4711.749.0410.1711.2310.589.749.5212.2218.3121.459.2711.2210.89999999999999999798979998999997999797999898999999989799989799999799999799989999999998999699测点号Th(10-6)UTh/U同位素比值207Pb/206Pb207Pb/235U206Pb/238U年龄值(Ma)207Pb/206Pb207Pb/235U206Pb/238U谐和度(%)续表1刘浩等：西大别红安岩群含磷岩系的形成时代及物源分析283华 南 地 质2023 年55565758606162636465666768697071727374757677787980PM301-8(磷矿石)12345678910111213141516181920405.8218.7176.8109.7362.8150.0114.0105.8195.085.6116.8116.691.674.7292.937.670.7179.3200.6154.173.1168.2103.0130.7131.554.115032322164.820420517612813017958.012914149.295.9146132119225.481.0164.579.2189.8160.7215.582.967.981.9125.1125.441.995.6107.862.385.2223.6187.5160.963.2154.154.4113.2140.667.324317535376.117819025311889.511315116617846.612821818890.81.802.701.081.391.910.930.531.282.871.050.930.932.190.782.720.600.830.801.070.961.161.091.891.150.940.800.621.840.630.851.151.080.691.091.461.590.390.770.791.050.750.670.701.310.06710.07030.06750.06710.06550.06550.06050.06510.06600.06530.06770.06550.06640.06500.06510.06620.06640.06530.06580.06620.06450.06570.06680.06740.06820.12610.06510.06530.18580.06430.06090.06960.06730.06730.06790.06620.12280.06290.06270.12440.06750.06640.06980.06400.00230.00320.00240.00270.00230.00240.00250.00270.00290.00300.00320.00260.00460.00290.00330.00460.00290.00230.00220.00290.00650.00330.00470.00320.00350.00540.00240.00220.00350.00350.00280.00250.00240.00310.00290.00290.00290.00260.00330.00470.00310.00240.00270.00401.24431.28641.25311.23101.14211.21640.84171.20921.23041.22311.17101.21021.20591.18731.11211.12101.21131.13131.21991.22581.09641.13621.22451.22351.24796.12551.13061.202313.31410.88980.85821.29701.25381.23801.26361.21986.51061.08870.90596.09871.24271.23231.29921.15080.04180.05610.04420.04910.04230.04330.03880.05250.05340.05610.05360.04830.08100.05090.05180.07330.04880.03930.04090.05140.10000.05600.08380.05690.06330.24930.04220.04110.25730.04270.03870.04640.04760.05540.05680.05290.16080.04410.04610.22030.05740.04630.05290.06870.13390.13350.13370.13320.12520.13410.10030.13400.13480.13510.12510.13440.13320.13360.12540.12560.13430.12510.13420.13450.12510.12530.13430.13320.13330.35450.12560.13380.51650.10330.10210.13470.13390.13410.13400.13430.38130.12530.10490.35600.13310.13360.13470.13230.00140.00210.00150.00210.00160.00160.00220.00220.00200.00200.00150.00190.00270.00180.00230.00280.00190.00150.00150.00170.00310.00180.00280.00200.00190.00610.00150.00160.00430.00150.00140.00170.00170.00170.00200.00190.00390.00180.00190.00490.00170.00150.00240.0026843939854843791791620789809783857791818772776813820783798813759798831852876204477678327057526359178488568658131998706698202085481892073971.1492.5973.3085.1870.2171.2987.8088.8887.9696.7593.5283.33150.9294.4373.15145.2192.5972.2275.0092.59217.57106.32147.0698.14106.3375.3178.8572.2231.48112.9565.7374.0874.0796.2987.5092.5942.2887.03108.3266.6695.2177.0079.63133.32821840825815774808620805815811787805803795759763806768810812752771812811822199476880227026466298448258188308102047748655199082081584577818.9124.9319.9422.3720.0419.8521.3824.1324.3225.6425.0822.2037.3023.6324.9135.0822.4018.7118.7323.4448.4426.6038.2526.0028.6035.5620.1318.9518.3422.9321.1420.5421.4325.1525.4924.1921.7821.4424.5731.5425.9721.0823.3532.4281080880980676181161681181581776081380680876176381276081281476076181280680719567638092684634626814810811811812208276164319638058088158018.1112.228.6711.939.399.3113.1812.2811.5611.508.4710.6315.1310.5213.0516.2910.898.498.729.6318.0210.3815.9211.3711.0129.008.528.9618.548.968.059.469.479.8511.2911.0218.2510.1211.3323.299.928.6813.4014.599896989898999999999996999998999999989999989899999899999999989996989997999898989898999697测点号Th(10-6)UTh/U同位素比值207Pb/206Pb207Pb/235U206Pb/238U年龄值(Ma)207Pb/206Pb207Pb/235U206Pb/238U谐和度(%)续表1284第39卷 第2期21222425262728293032333435363739404142434445474849505152535456575859606162646566676869707158.011012725280.370.322222712286.453.732.825954.633814212163.622116620318354165.612416683.480.428819610968.056.686.614388.812022015126774.914825840916256.865.810630510867.931117418610210626.622654.130983.315258.423790.015614328469.620024874.873.327522084.295.682.080.522612886.620111311171.81582091992281.021.671.200.830.741.030.711.310.650.850.511.231.151.011.091.700.791.090.941.841.301.281.900.940.620.671.111.101.050.891.290.710.691.080.630.701.391.101.342.411.040.941.242.050.710.06830.06840.06620.06490.06670.06210.06490.06740.06570.06720.06680.07200.06420.12320.06600.06580.12380.06490.06860.06250.06630.06530.06670.06600.06790.06730.0650