Age and origin of Muzidian fine-grained monzogranite dyke in Dabie orogenic belt: Zircon U-Pb dating and Hf isotopic constraints
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摘要:
用LA-ICP-MS技术对北大别木子店地区细粒二长花岗岩脉中的锆石进行原位U-Pb年龄和Hf同位素测定，结果表明，该花岗岩形成于128.9±0.7Ma，为早白垩世岩浆活动的产物，在锆石中发现古元古代和新元古代的锆石核；锆石εHf（t）介于-25.1~-19.2之间，平均值为-22.7，二阶段模式年龄TDM2主要介于2115~2505Ma之间，2个继承锆石分析点分别给出了-10.5和6.5的εHf（t）值，对应的二阶段模式年龄TDM2分别为1151Ma和1709Ma。木子店地区细粒二长花岗岩脉的锆石年龄和Hf同位素特征表明，花岗岩为古元古代古老地壳物质部分熔融形成，岩石源区可能有中元古代地幔物质及太古宙古老地壳物质的贡献，形成于大别造山带从挤压向伸展的转换阶段。
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关键词:
- 细粒二长花岗岩 /
- LA-ICP-MS锆石U-Pb测年 /
- Hf同位素 /
- 木子店 /
- 大别山
Abstract:This paper presents LA-ICP-MS zircon U-Pb dating and zircon in-situ Hf isotopic analytical results for the Muzidian fine-grained monzogranite dyke in northern Dabie orogenic belt. The dating results show that the granite was formed at 128.9±0.7Ma in Early Cretaceous. Two Paleoproterozoic and Neoproterozoic inherited zircons were found in the granites. The Hf isotopic analytical results show that the zircons εHf(t) values are from -25.1 to -19.2 with the mean of -22.7, and the two-stage Hf model ages (TDM2) generally range from 2115Ma to 2505Ma. The εHf(t) values of the two inherited zircons are -10.5 and 6.5, with the corresponding TDM2 of 1151Ma and 1709Ma, respectively. The zircon U-Pb dating and in-situ Hf isotopic results indicate that the parental magmas of Muzidian finegrained monzogranite dyke were derived from partial melting of Paleoproterozoic crustal rocks, with some Mesoproterozoic mantle and Archean crustal materials probably making contributions to the source. The Muzidian finegrained monzogranite dyke is considered to have been formed at the time of tectonic transition from compression to extension during Early Cretaceous in the Dabie orogen.
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关于国际地层年表中的侏罗系/白垩系界线年龄，在21世纪80年代初国际地学界分别提出了144Ma和130Ma两种方案。英国剑桥大学Harland等[1]提出了侏系系/白垩系界线年龄为144Ma，是用“年龄平摊法”算出的；法国居里大学Kennedy等[2]根据各国海相地层中海绿石年龄的测定结果提出侏罗系/白垩系界线年龄为130Ma [3](包括世界各国20个实验室、136位专家提供的研究成果)。
对上述2种方案，144Ma(现在国际地层年表修改为145Ma)方案被认为不可取[4]。王思恩等[3]评述中国陆相生物地层的侏罗系/白垩系界线在河北滦平盆地；王思恩等[5]确认130.7Ma为中国陆相地层侏罗系/白垩系的界线年龄。本文依据全国地层委员会组织的滦平盆地中生代地层野外考察时采集的凝灰岩样品，对大北沟组顶部凝灰岩(斑脱岩)锆石实测年龄数据表明：侏罗系/白垩系界线的年龄应在129.9±1.1Ma，该数据与Odin为首的各国专家提出的130Ma方案一致，考虑了法国、英国、前苏联、瑞典、美国的侏罗系/白垩系界线附近地层中多国的海绿石测年数据，建议采用法国侏罗系/白垩系界线为标准[2]。
“国际地层表说明” [6]明确指出，“侏罗系—白垩系界线无疑是所有系(纪)中最成问题的界线之一”。究其原因，无论海相或陆相均未找到沉积连续和化石丰富的界线地层剖面，更未建立层型，使研究者讨论问题缺乏统一的标准。中国陆相侏罗纪—白垩纪地层发育得天独厚，自Grabau于1923年提出“热河生物群”开始，两系界线划分一直存在激烈争论，争论焦点是热河生物群的发展演化和层位归属[7-8]。
1. 地质背景
中国陆相侏罗系—白垩系相当发育，分布广泛。在中国东部地区主要分布于各种断陷盆地和山间小盆地中。中国侏罗纪和白垩纪的陆相地层中赋存丰富的煤、石油、天然气资源；火山岩地层中含有多种金属矿产，因此，对侏罗纪—白垩纪地层的研究有重要的意义。通过建立“陆相层型”工作[9-22]，于冀北滦平盆地火斗山乡张家沟找到了大北沟组-大店子组-西瓜园组沉积连续剖面，该剖面出露完整、化石丰富、无后期构造干扰；该剖面属单一断陷湖盆沉积，以半深湖-深湖相夹扇三角洲相为特征，夹多层火山岩。剖面上发育丰富的多门类化石，富含三尾拟蜉蝣、介形虫、叶肢介、腹足类、双壳类、两栖类龟鳖类、节肢动物虾类、脊椎动物狼鳍鱼、鲟等。特别是张家沟下营榆树下剖面，大北沟组顶部—大店子组底部界线为典型的陆相地层剖面，属单一浅湖相泥岩夹砂岩沉积。经过多学科的综合研究，建立陆相侏罗系—白垩系界线层型，确定界线点位以介形虫Cypridea stenolonga的始现为标志。
目前侏罗系/白垩系界线附近的生物地层学研究，对地层的划分和对比仍存在不同的意见，例如，以冀北—辽西地区为例，侏罗系/白垩系界线划在义县组底，还是划在义县组之中？这是依然需要研究与讨论的问题。
2. 地层序列及采样层位
陆相侏罗系—白垩系界线过渡地层在冀北滦平盆地分别称大北沟组和大店子组，发育于该地区南部，(从东到西)沿西沟—大北沟—大店子—张家沟—兴隆沟—柏砬沟一线呈带状出露(图 1)。大北沟组剖面位于榆树下村的西侧，起点坐标：北纬40o49' 20″、东经117o12'99″；终点坐标：北纬40o 49' 144″、东经117o 12' 50″，总厚226.95m。出露完好且化石丰富。笔者对冀北滦平盆地侏罗系/白垩系界线附近大北沟组顶部的凝灰岩进行了采样(图版Ⅰ)。
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图 1 冀北滦平县榆树下侏罗系与白垩系界线剖面[23]Figure 1. The section of the boundary between Jurassic and Cretaceous in Yushuxia, Luanping County, Hebei Province下白垩统义县阶(下部)大店子组一段(K1d1)黄褐色厚层细砾岩和含砾粗砂岩
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上侏罗统大北沟阶大北沟组三段(J3d3)
27.黄绿色粉砂质泥岩、粉砂岩，夹大量小泥灰岩透镜体。含介形类Eoparacypris surriensis, E.jingshangensis, Torinina obesa, Darwinula leguminella，D.xiayingensis；叶肢介Nestoria pissovi 10.96m
26.灰绿色泥岩、粉砂质泥岩，夹灰色薄层泥灰岩和黑色页岩。由下至上发育4个韵律，每一韵律下部为均一的泥岩，上部夹泥灰岩和黑色页岩。含丰富的介形类Luanpingella postacuta, L. dorsincurva, Torinina obesa, Eoparacypris surriensis, E. jingshangensis, E. aff. macroselina, Pseudoparacypridopsis luanpingensis, P. muntfieldensis, P. dorsalta, Limnocypridea subplana, Rhinocypris dadianziensis, R. subechinata, Djungarica sp. 1, Djungarica sp. 2, Darwinula xiayingensi, D. leguminella, D. dadianziensis等；叶肢介Nestoria pissovi, N. xishunjingensis, N. krasinetzi, Pseudograpta zhangjiagouensis, P.dadianziensis, Nestoria sp., Yanshania xishunjingensis, Y. subovata, N. latiovata, P. huodoushanensis；双壳类Arguniella lingyuanensis, A. yanshanensis 18.27m
25.厚层土黄色钙质泥岩为底，上覆灰绿色钙质粉砂岩和深灰色钙质泥岩，夹灰黑色钙质泥页岩和薄板状粉砂岩、泥灰岩。含丰富的介形类Luanpingella postacuta, L. dorsicurva, Eoparacypris jingshangensis, E. surriensis, Pseudoparacypridopsis luanpingensis, P. muntfieldensis, Rhinocypris dadianzienis, R. subechinata, Darwinula leguminella, D. dadianziensis, D. xiayingensis等；叶肢介Nestoria xishunjingensis, Keratestheria gigantea, K. longipoda, Pseudograpta zhangjiagouensis, P. dabeigouensis 21.23m
24.灰绿色粉砂质泥岩和钙质粉-细砂岩，夹深灰色钙质页岩、硅质泥岩和薄层泥灰岩。向上粉砂岩增多。含丰富的介形类Luanpingella postacuta, L. dorsicurva, Eoparacypris jingshangensis, E. surriensis, Pseudoparacypridopsis luanpingensis, P. muntfieldensis, Rhinocypris dadianzienis, R. subechinata, Darwinula leguminella, D. dadianziensis, D. xiayingensis, Djungarica sp. 2等；叶肢介Nestoria xishunjingensis, Keratestheria gigantea, K. ovata 38.20m
23.灰黄色、灰绿色中-厚层中-粗粒凝灰质砂岩，层理发育欠佳 7.94m
22.灰紫色凝灰角砾岩。角砾粒径小，岩层内分布不均，具有流动构造，横向呈透镜状 1.77m
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上侏罗统大北沟阶大北沟组二段(J3d2)
21.黄褐色中薄层钙质粉砂岩、粉砂质泥岩 5.43m
20.黄褐色泥岩夹薄中层粉砂岩。产昆虫Ephemeropsis trisetailis；叶肢介Nestoria pissovi, N. xishunjingensis，Yanshania xishunjingensis, N. cf. krasinetzi, Pseudograpta cf. dadianziensis 20.18m
19.灰色中-薄层钙质泥岩，夹黑色页岩和灰黄色粉砂岩。含叶肢介Nestoria pissovi, N. xishunjingensis 1.39m
18.黄褐色粉砂岩，夹灰色薄层钙质泥岩。含叶肢介Nestoria pissovi, N. xishunjingensis, N. krasinetzi, N. karaica, N. Rotalaria 11.88m
17.黄褐色粉砂岩，夹灰色薄层泥灰岩 5.28m
16.灰褐色硅质页岩和钙质页岩。含叶肢介Nestoria pissovi, N.karaica, N. xishunjingensis, N. rotalaria, N. mirififormis, N. oblonga，Jibeilimnadia ovata, Yanshania cf. xishunjingensis, Pseudograpta cf. zhangjiagouensis 1.92m
15.黄褐色中-厚层中-粗粒长石石英砂岩、块状粉砂岩 0.96m
14.深灰色钙质泥岩和土黄褐色粉砂岩、粉砂质泥岩，夹褐黑色钙质页岩和硅质页岩。含叶肢介Jibeilimnadia ovata, J. curtiovata, J. latiovata, J. elliptica, Nestoria pissovi，N. karaica, N. krasinetzi，N. xishunjingensis，Yanshania zhangjiagouensis 5.28m
13.灰黄色中-薄层粉砂岩，夹褐黑色钙质页岩和薄层泥灰岩。含叶肢介Nestoria pissovi, Nestoria sp.及大量植物碎片 7.25m
12.褐黑色薄片状硅质泥页岩、褐黄色钙质页岩和灰绿色泥岩，夹粉砂质泥岩，泥灰岩透镜体和薄层凝灰质中粗砂岩。含叶肢介Nestoria xishunjingensis, N. pissovi, N. luanpingensis, N. karaica, N. krasinetzi, Yanshania xishunjingensis, Y. subovata, Y. zhangjiagouensis 7.25m
11.黄褐色薄-中层粗粉砂岩，夹透镜状细砂岩和硅质泥岩 3.02m
10.灰褐色薄-中层硅质泥岩，夹灰绿色薄层粉砂泥岩。含叶肢介N. pissovi, Yanshania xishunjingensis 6.04m
9.浅灰黄色中-薄层状粗粉砂岩和细砂岩。形成下细上粗的5个旋回 4.23m
8.灰褐色薄层状硅质泥岩、硅质页岩，顶部为浅灰色中层凝灰质细砂岩 2.42m
7.灰褐色中-厚层状硅质泥岩和黄绿色粉砂质泥岩互层。含叶肢介Yanshania xishunjingensis, Y. subovata, Nestoria cf. reticulata, N. pissovi, N. xishunjingensis, Jibeilimnadia ovata 4.23m
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上侏罗统大北沟阶大北沟组一段(J3d1)
6.灰绿色中-厚层凝灰质砂岩、含砾砂岩与粉砂岩、泥岩互层 12.90m
5.灰绿色厚层含砾粗砂岩与粗砾岩，砾石分布不均，局部透镜状，岩层横向变化较大 2.20m
4.灰绿色中-厚层凝灰质中细粒砂岩、含砾粗夹凝灰质粉砂岩、泥岩，发育斜层理层 6.20m
3.灰绿色砂屑沉凝灰岩，层理发育 3.50m
2.褐灰色中薄层凝灰质中细粒砂岩、含砾粗夹凝灰质粉砂岩、泥岩互层 8.80m
1.灰绿色、褐灰色中薄层夹厚层凝灰质含砾砂岩、夹薄层沉凝灰岩 1.50m
——————火山喷发不整合——————
下伏地层：上侏罗统待建阶张家口组灰绿色凝灰岩
3. 分析方法和结果
3.1 分析方法
锆石U-Th-Pb同位素测定在北京离子探针中心的SHRIMP-Ⅱ上进行，参照分析流程[24]。原始数据的处理[24-25]和锆石U-Pb谐和图的绘制采用Ludwig博士编写的Squid和Isoplot程序[26]。所扣除普通铅的组成根据Stacey等给出的模式计算得出[27](表 1)，同位素比值和年龄的误差为1σ相对误差，206Pb/238U年龄加权平均值为95%的置信度误差。
表 1 滦平盆地侏罗纪—白垩纪斑脱岩样品(2PDBG-2-1) SHRIMP锆石U-Th-Pb测定结果Table 1. SHRIMP U-Th-Pb results for zircons bentonate(2PDBG-2-1) from the Luanping Basin, Hebei Province测点 206Pbc/% U/10-6 Th/10-6 232Th/
238U206Pb*/10-6 206Pb/238U
年龄/Ma207Pb*/235U 206Pb*/238U 误差相关系数 比值 ±1 比值 ±1σ 2PDBG-2-1-1.1 0.64 825 446 0.56 14.4 129.0±2.2 0.1136 7.6 0.02022 1.7 0.229 2PDBG-2-1-2.1 0.57 435 189 0.45 7.77 131.8±2.4 0.128 8.4 0.02066 1.8 0.215 2PDBG-2-1-3.1 0.21 509 221 0.45 8.93 130.0±2.3 0.1299 7.1 0.02038 1.8 0.248 2PDBG-2-1-4.1 0.00 545 327 0.62 9.49 130.6±2.4 0.151 9.4 0.02047 1.8 0.195 2PDBG-2-1-5.1 1.24 595 366 0.64 10.5 129.6±2.2 0.0967 9.6 0.02031 1.8 0.183 2PDBG-2-1-6.1 0.22 676 395 0.60 12.1 132.6±2.2 0.1311 3.9 0.02079 1.7 0.433 2PDBG-2-1-7.1 3.45 432 184 0.44 7.52 125.0±2.7 0.054 51 0.01958 2.2 0.043 2PDBG-2-1-8.1 0.00 836 556 0.69 14.9 132.4±2.2 0.1407 3.4 0.02075 1.7 0.482 2PDBG-2-1-9.1 0.62 644 337 0.54 11.2 128.3±2.2 0.1128 8.7 0.02010 1.8 0.201 2PDBG-2-1-10.1 9.71 848 696 0.85 16.3 128.8±3.9 0.074 76 0.02019 3.1 0.041 2PDBG-2-1-11.1 0.51 789 540 0.71 13.6 127.0±2.1 0.1195 4.4 0.01990 1.7 0.385 2PDBG-2-1-12.1 0.00 381 192 0.52 6.74 134.9±3.0 0.204 13 0.02115 2.2 0.175 2PDBG-2-1-13.1 0.00 521 286 0.57 9.11 130.8±2.3 0.145 8.3 0.02049 1.8 0.217 2PDBG-2-1-14.1 0.41 611 233 0.39 10.9 132.1±2.4 0.1325 4.3 0.02070 1.8 0.424 2PDBG-2-1-15.1 1.66 744 437 0.61 12.8 126.2±2.2 0.091 15 0.01977 1.8 0.122 2PDBG-2-1-16.1 0.00 745 430 0.60 13.1 131.1±2.2 0.1444 3.4 0.02054 1.7 0.490 2PDBG-2-1-17.1 0.00 443 225 0.53 7.63 128.0±2.2 0.1448 4.7 0.02005 1.8 0.379 2PDBG-2-1-18.1 0.00 940 767 0.84 16.3 129.2±2.1 0.1375 3.2 0.02024 1.6 0.510 3.2 分析结果
样品中的锆石晶体呈无色透明-浅黄色自形，粒度多在150~200μm之间，长宽比为2~3。阴极发光图像(CL)显示，锆石具典型的岩浆生长环带，古锆石属于岩浆结晶的产物(图版Ⅰ-g、h)。根据可见光图像和CL图像选择合适的位置进行测定，即根据可见光图像剔出裂隙发育和含包裹体较多的颗粒，选取无裂缝、无包裹体的区域；同时根据CL图像，避免测定位置跨越不同世代的混合区域。
凝灰岩样品(2PDBG-2-1)共测试18颗锆石；其中U含量为381×10-6~848×10-6；个别可达940×10-6；Th含量为184×10-6~696×10-6；个别可达767×10-6；Th/U值为0.21~3.45，个别可到9.71(表 1)。样品2PDBG-2-1测试了18个数据点，15个数据点位于谐和线上(图 2)，排除受后期普通铅影响的3个数据点(7.1、10.1、15.1)的年龄值。15个数据点的206Pb/238U年龄为129.9±1.1 Ma，MSWD=0.79，该年龄代表了大北沟组顶部凝灰岩的形成时代。
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图 2 侏罗系与白垩系界线(2PDBG-2-1)锆石U-Pb谐和图Figure 2. Zircon U-Pb concordia diagrams of Jurassic and Cretaceous strata4. 结论
(1) 依据生物地层的研究，将中国陆相侏罗系/白垩系界线划在大北沟组与大店子组之间，由此结合前人资料推测，国际海相侏罗系/白垩系界线的年龄应接近130.7Ma。
(2) 参考前人资料土城子组(后城组)下部年龄为142.6 ± 1.9Ma，中部为139.6 ± 1.5Ma，上部为136.4±1.9~137.3±1.1Ma；张家口组底部锆石年龄为133.7±1.1Ma，张家口组顶部锆石年龄为130.8± 0.7Ma；本文获得大北沟组顶部精确锆石年龄129.9±1.1M，建议将大北沟组顶部凝灰岩(斑脱岩)锆石年龄129.9±1.1Ma视为中国陆相侏罗系/白垩系界线年龄。
(3) 冀北滦平盆地侏罗系—白垩系同位素年龄测定表明，侏罗系/白垩系界线年龄值可能接近130Ma，而非145Ma。
致谢: 锆石 Hf 同位素数据处理得到中国地质调查局武汉地质调查中心朱江博士的帮助，南京大学地球科学与工程学院王国光博士提供了部分锆石Hf 同位素原始数据资料，成文后得到中国地质大学（武汉）地球科学学院王连训老师的修改和建议，审稿专家对本文提出了宝贵的修改意见和建议，修改过程中得到中国地质大学（武汉）资源学院张金阳老师的指导和帮助，在此一并致谢。 -
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图 1 北大别木子店地区地质简图及大地构造位置①
1—第四系；2—大别山群；3—斑状二长花岗岩；4—二长花岗岩；5—二长花岗岩脉；6—石英二长岩；7—片麻状石英闪长岩；8—英云闪长质片麻岩；9—断层；10—地质界线；11—研究区大地构造位置；12—采样位置
Figure 1. Geological sketch map of the Muzidian area in North Dabie orogen
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图 2 样品野外（a）及镜下显微照片（正交偏光）（b）
Pl—斜长石；Kf—钾长石；Q—石英；Bi—黑云母
Figure 2. Field characteristics (a) and photomicrographs (b) of the sample
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图 3 木子店地区细粒二长花岗岩中锆石阴极发光图像
（实心圆圈和虚线圆圈分别代表 U-Pb、Lu-Hf 同位素测定位置，数字为 206Pb/238U 年龄（Ma）和εHf(t)值）
Figure 3. Representative CL images of the fine grainedmonzogranite in Muzidian area
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图 4 木子店地区细粒二长花岗岩 LA-ICP-MS 锆石 U-Pb 谐和图（a）和 206Pb/238U 年龄图（b）
Figure 4. Zircon U-Pb concordia diagram (a) and 206Pb/238U age diagram (b)of the fine grained monzogranite in Muzidian area
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图 5 木子店地区细粒二长花岗岩锆石 U-Pb 年龄-Hf 同位素图解
Figure 5. Plots of zircon U-Pb age versus Hf isotope of the fine grained monzogranite in Muzidian area
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表 1 木子店地区细粒二长花岗岩（D012）LA-ICP-MS 锆石 U-Th-Pb 同位素分析结果
Table 1 LA-ICP-MS zircon U-Th-Pb dating results of the fine grained monzogranite (D012) in Muzidian area
点号 含量/10-6 Th/U 同位素比值 年龄/Ma Th U U207Pb/206 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 86.8 276 0.31 0.0628 0.002 1.0146 0.034 0.1164 0.0011 700 70.4 711 16.9 710 6.5 3 229 254 0.90 0.0519 0.0062 0.1396 0.017 0.0202 0.0004 280 252 133 15.4 129 2.2 4 431 426 1.01 0.522 0.0048 0.1397 0.012 0.0198 0.0003 295 211 133 10.9 126 1.7 5 422 456 0.92 0.0479 0.0036 0.1308 0.0098 0.0199 0.0003 95 170 125 8.8 127 1.7 7 63.4 156 0.41 0.0585 0.0099 0.1452 0.023 0.0201 0.0005 550 375 138 20.7 129 3.2 9 968 507 1.91 0.0464 0.0032 0.1333 0.0091 0.021 0.0004 17 159 127 8.2 134 2.3 10 122 634 0.19 0.0515 0.0025 0.1457 0.0072 0.0205 0.0002 261 111 138 6.3 131 1.4 13 124 340 0.37 0.0555 0.0033 0.226 0.016 0.0306 0.001 432 133 207 13.6 195 6.3 16 338 1737 0.19 0.1158 0.0025 4.8528 0.107 0.3036 0.0021 1892 39 1794 18.7 1709 10.3 17 65 244 0.27 0.0554 0.0039 0.2095 0.015 0.0277 0.0004 428 164 193 12.5 176 2.6 19 78 293 0.27 0.0461 0.0046 0.1221 0.012 0.0197 0.0004 400 -172 117 10.8 126 2.5 21 107 156 0.68 0.0494 0.0077 0.1317 0.02 0.0203 0.0004 165 330 126 17.5 129 2.4 
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表 2 木子店地区细粒二长花岗岩 LA-MC-ICP-MS 锆石 Lu-Hf 同位素分析结果
Table 2 LA-MC-ICP-MS zircon Lu-Hf isotopic compositions of thefine grained monzogranite in Muzidian area
点号 176Hf/177Hf 2σ 176Lu/177Hf 2σ 176Yb/177Hf 2σ ε(o) 2σ 锆石年龄/Ma εHf(t) 2σ TDM1/Ma TDM2/Ma fLu/Hf 1 0.282538 0.000012 0.001818 0.000019 0.050251 0.00029 -8.29 0.66 710 6.5 0.7 1033 1151 -0.95 3 0.282014 0.000013 0.000482 0.000007 0.0128 0.0002 -26.82 0.68 129 -24 0.69 1719 2377 -0.99 5 0.282061 0.000015 0.000680 0.000007 0.017733 0.00021 -25.15 0.74 127 -22.4 0.75 1662 2287 -0.98 7 0.282149 0.000014 0.000556 0.000005 0.013359 0.00023 -22.03 0.70 129 -19.3 0.71 1536 2115 -0.98 9 0.281948 0.000014 0.001179 0.000019 0.029982 0.00043 -29.15 0.7 134 -26.3 0.71 1842 2505 -0.96 10 0.282077 0.000014 0.000431 0.000032 0.009498 0.00074 -24.59 0.71 131 -21.8 0.71 1630 2254 -0.99 16 0.281415 0.000014 0.000433 0.000015 0.011213 0.0004 -48.01 0.71 1892 -6.4 0.81 2528 2793 -0.99 19 0.282126 0.000015 0.000405 0.000015 0.008967 0.00043 -22.85 0.74 126 -20.1 0.75 1562 2161 -0.99 21 0.281981 0.000012 0.000281 0.000003 0.007337 0.0001 -27.96 0.66 129 -25.1 0.69 1754 2438 -0.99
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表 3 大别地区中生代花岗岩类同位素年龄及 Hf 同位素数据
Table 3 Isotope ages and Hf isotope data of theMesozoic granitoid rocks in Dabie orogen
岩体 岩性 年龄/Ma 测试对象及方法 εHf(t) TDM2/Ma 资料来源姚冲 姚冲 花岗斑岩 139.8±2.2 LA-ICP-MS 锆石 U-Pb -26.5~-23.6 2252~2414 [31] 姚冲 花岗岩 133.3±1.3 LA-ICP-MS 锆石 U-Pb -26.5~-20.0 2430~2830 [62] 新县 花岗岩 125.5±1.5 LA-ICP-MS 锆石 U-Pb -22.92~-19.4 2390~2610 [58] 商城 斑状黑云母二长花岗岩 137±2 LA-ICP-MS 锆石 U-Pb -30.2~-15.6 2173~3079 [37] 达权店 二长花岗岩 118±1 LA-ICP-MS 锆石 U-Pb -23.2~-16.7 2227~2628 [37] 千鹅冲 二长花岗岩 130±2 SHRIMP 锆石 U-Pb 集中在-24.5~-11.3 之间 1362~2736 [38] 千鹅冲 花岗斑岩 129±2 SHRIMP 锆石 U-Pb -19. 8~-11.2 1895~2385 [38] 石鼓尖 角闪石英二长闪长岩 132.8±4.3 SHRIMP 锆石 U-Pb -30.5~-27.9 2942~3100 [36] 舒潭 斑状二长花岗岩 132.3±1.0 SHRIMP 锆石 U-Pb -26.0~-20.9 2502~2824 [36] 舒潭 钾长花岗岩 127.9±0.8 SHRIMP 锆石 U-Pb -25.2~-15.1 2133~2766 [36] 天堂寨 斑状二长花岗岩 131.7±3.6 LA-ICP-MS 锆石 U-Pb -28.1~-22.5 2604~2885 [36] 沙坪沟 石英二长岩 134±2 LA-ICP-MS 锆石 U-Pb -33.6~-17.0 2556~3292 [63] 沙坪沟 正长花岗岩 132±1 LA-ICP-MS 锆石 U-Pb -28.2~-23.5 2640~2957 [63] 沙坪沟 花岗斑岩 138±8 LA-ICP-MS 锆石 U-Pb -23.7~-16.9 2253~2683 [63] 沙坪沟 石英二长斑岩 135±4 LA-ICP-MS 锆石 U-Pb -32.1~-20.3 2465~3198 [63] 沙坪沟 二长花岗岩 135±1 LA-ICP-MS 锆石 U-Pb -31.1~-24.2 2708~3142 [63] 沙坪沟 黑云母闪长岩 128±2 LA-ICP-MS 锆石 U-Pb -27.9~-22.0 2565~2934 [63] 沙坪沟 黑云母二长岩 129±2 LA-ICP-MS 锆石 U-Pb -26.6~-21.9 2564~2857 [63] 沙坪沟 石英正长岩 116±2 LA-ICP-MS 锆石 U-Pb -17.2~-12.9 1989~2261 [63] 沙坪沟 花岗岩斑岩 114±1 LA-ICP-MS 锆石 U-Pb -23.4~-10.4 1826~2642 [63] 木子店 细粒二长花岗岩 128.9±0.7 LA-ICP-MS 锆石 U-Pb -25.1~-19.2 2115~2505 本文
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