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河北赞皇杂岩官都群碎屑沉积岩锆石SHRIMPU-Pb定年及其地质意义

张帆, 王彦斌, 杨崇辉, 杜利林, 苑鸿庆

张帆, 王彦斌, 杨崇辉, 杜利林, 苑鸿庆. 2019: 河北赞皇杂岩官都群碎屑沉积岩锆石SHRIMPU-Pb定年及其地质意义. 地质通报, 38(8): 1335-1343.
引用本文: 张帆, 王彦斌, 杨崇辉, 杜利林, 苑鸿庆. 2019: 河北赞皇杂岩官都群碎屑沉积岩锆石SHRIMPU-Pb定年及其地质意义. 地质通报, 38(8): 1335-1343.
ZHANG Fan, WANG Yanbin, YANG Chonghui, DU Lilin, YUAN Hongqing. 2019: SHRIMP U-Pb zircon dating of clastic sedimentary rocks of the Guandu Group, Zanhuang Complex, Hebei Province, and its geological significance. Geological Bulletin of China, 38(8): 1335-1343.
Citation: ZHANG Fan, WANG Yanbin, YANG Chonghui, DU Lilin, YUAN Hongqing. 2019: SHRIMP U-Pb zircon dating of clastic sedimentary rocks of the Guandu Group, Zanhuang Complex, Hebei Province, and its geological significance. Geological Bulletin of China, 38(8): 1335-1343.

河北赞皇杂岩官都群碎屑沉积岩锆石SHRIMPU-Pb定年及其地质意义

基金项目: 

国家自然科学基金项目《全球岩浆静寂期(2.4~2.3Ga)的岩浆活动——以华北克拉通为例》 41572175

中国地质调查局项目《华北陆块中部和东部前寒武纪构造带基础地质调查》 DD20190003

《华北克拉通中部新太古代—古元古代构造转折期的岩浆事件——地层格架及赞皇地区1:5万专题填图》 DD20160121

详细信息
    作者简介:

    张帆(1990-), 男, 博士, 从事岩石地球化学和地质年代学研究。E-mail:zhangfan2294@163.com

    通讯作者:

    王彦斌(1966-), 男, 研究员, 从事同位素地质年代学和地球化学研究工作。E-mail:yanbinw@cags.ac.cn

  • 中图分类号: P588.21;P597+.3

SHRIMP U-Pb zircon dating of clastic sedimentary rocks of the Guandu Group, Zanhuang Complex, Hebei Province, and its geological significance

  • 摘要:

    新太古代-古元古代表壳岩系在华北克拉通广泛发育,在赞皇地区也出露有较典型的中低级变质的火山-沉积岩系,即从原赞皇群解体出来的官都群,其形成时代和成因目前仍有争议。官都群的主要岩石组合为变基性火山岩(包括角闪片岩和斜长角闪岩)、大理岩、石英片岩,以及一系列长英质副片麻岩等。对其中的长英质副片麻岩进行碎屑锆石定年研究,并结合前人已报道的碎屑锆石数据可知,碎屑锆石年龄主要峰值约为2.5Ga,部分样品出现2.0~2.2Ga的峰值。变质锆石记录主要有2个范围,分别为2.48Ga左右和1.85~1.9Ga,可能代表了2期不同的构造热事件记录。结合该地区近年来的研究,可以得到如下认识:①样品中存在形态完好的长柱状锆石,表明是近源沉积;②约2.48Ga的变质记录与核部岩浆锆石的年龄(约2.5Ga)非常接近,可能代表了物源区中酸性岩体侵位后遭受的一次构造热事件,而不代表沉积岩形成后遭受变质的记录,即沉积过程晚于2.48Ga;③官都群至少有一部分岩石组合形成于古元古代;④官都群可能是不同时代、不同岩性单元拼贴而成,需要进一步解体。

    Abstract:

    The Neoarchean-Paleoproterozoic supercrustal rocks as well as the Guandu Group from Zanhuang Complex have been widely reported in the whole North China Craton. The formation age and the environment of the Guandu Group are still controversial. Zircon SHRIMP U-Pb data of clastic sedimentary rocks of the Guandu Group, combined with previously available detrital zircon data, reveal that the majority of detrital ages are at~2.5Ga, with 2.0~2.2Ga peak for some samples. At least two metamorphic events were recorded, i.e., ~2.48Ga and 1.85~1.9Ga. Based on data obtained in this study as well as other studies of the Zanhuang Complex in recent years, some conclusions can be drawn as follows:① The well-preserved elongate prismatic morphology of some zircons implies that the source of depositional materials was not far away; ② The~2.48Ga metamorphic record is so close to the crystallization age of inner cores of zircons (~2.5Ga), probably suggests the existence of metamorphism that happened soon after the formation of the igneous rocks before the deposition of Guandu Group rocks, i.e., the deposition happened after~2.48Ga; ③ At least part of the Guandu Group was formed in Paleoproterozoic instead of late Archean; ④ The Guandu Group was probably not a continuous stratigraphic unit, but was composed of lithological units formed in different epochs and environments, and it thus should be disintegrated.

  • 唢呐湖组湖相地层广泛发育于羌塘地块北部、可可西里地块和昆仑地块南部。最初唢呐湖组由西藏区调队建立,创名剖面位于唢呐湖东面,其岩石组合特征为紫红色砾岩、含砾砂岩、砂岩、粉砂岩、泥岩夹多层石膏组合,偶夹少量火山岩及沉凝灰岩。区域上,唢呐湖组角度不整合于侏罗系之上,总厚度约4300m[1]

    由于至今没有获得较确切的古生物化石依据和年龄数据,唢呐湖组的时代归属一直争论较大。前人根据岩石组合特征与地层序列,将唢呐湖组置于康托组之上,时代暂定为中新世—早上新世[2-3]。本次研究表明,这一时代归属偏新。

    最近,笔者在羌塘盆地北部万安湖地区实施石油地质科探井(羌地17井,图 1)钻探过程中,钻探岩心揭示唢呐湖组沉积地层厚466 m,未见顶,整体岩相特征为紫红色-灰绿色湖泊相沉积,区域上可与其他剖面岩相特征对比。岩心上部(0~168m)主要为透明石膏夹青灰色钙质泥岩和紫红色钙质泥岩组合;下部(168~466m)以紫红色泥岩为主,夹青灰色粉砂质泥岩、泥质粉砂岩、粉砂岩、岩屑石英细砂岩和含砾中-粗砂岩。在井深220.8~220.95m处,发现一层由同沉积沉凝灰岩蚀变形成的灰白色斑脱岩夹层,厚15cm(图 2-A)。

    图  1  羌塘盆地羌地17井钻井位置
    Figure  1.  The drilling position of the QD-17 well in the Qiangtang Basin
    图  2  羌塘盆地羌地17井唢呐湖组斑脱岩岩心照片(A)、扫描电镜特征(B、C)及样品锆石U-Pb谐和图(D、E)
    A—唢呐湖组斑脱岩夹层岩心特征,厚约15cm;B—斑脱岩中蒙脱石扫描电镜特征;C—斑脱岩中的斜发沸石;D、E—斑脱岩锆石U-Pb年龄谐和图及加权平均年龄
    Figure  2.  The core photos(A)SEM characteristics(B, C)of the bentonite sample of the Suonahu Formation from the QD-17 well in the Qiangtang Basin and zircon U-Pb concordia diagrams of the bentonite sample(D, E)

    通过X射线衍射和扫描电镜分析,该层斑脱岩主要成分为蒙脱石(图 2-B),见斜发沸石(图 2-C)、方沸石等矿物。笔者对该套斑脱岩开展了锆石U- Pb同位素测年,挑选出晶形完好的岩浆锆石。锆石U、Th和Pb测定在中国科学院地质与地球物理研究所CAMECA IMS-1280二次离子质谱仪(SIMS)上完成。43组数据分析结果表明,唢呐湖组斑脱岩的SIMS锆石206Pb/238U年龄加权平均值为46.57±0.30Ma(图 2-DE),时代为古近纪始新世早期。因此,这套由同沉积沉凝灰岩蚀变而成的斑脱岩,基本代表了古近纪始新世早期唢呐湖组的沉积年龄。

    由此可见,前人将唢呐湖组时代归属于中新世—早上新世[2-3]值得商榷。笔者认为,唢呐湖组的形成时代与康托组相当,两者可能为同期异相沉积地层。通常认为,康托组的时代归属为古近纪始新世早期[2, 4]:一方面,康托组形成于干旱气候环境,而唢呐湖组与康托组一样,同样形成于干旱气候环境;另一方面,从古地理环境分析可以看出,康托组主要发育于古地貌较高的冲洪积环境,为一套冲洪积相紫红色砂砾岩,而唢呐湖组主要沉积于古地貌较低的蒸发湖盆,为湖相蒸发岩膏盐夹紫红色细碎屑岩。因此,两者在不同的古地理单元,构成分布不一致的同期异相沉积地层。

    致谢: 野外工作中得到中国地质科学院地质研究所耿元生研究员、宋会侠助理研究员和李伦同学的帮助,锆石SHRIMP测试工作中得到宋彪研究员的帮助,特表谢意。
  • 图  1   赞皇杂岩区域地质图[3, 5, 7]

    Figure  1.   Geological map of the Zanhuang Complex

    图  2   官都群的东部地质剖面和采样位置

    Figure  2.   Geological section through the east part of the Guandu Group, showing sampling sites

    图  3   官都群碎屑沉积岩样品D0532-1和D0533-9野外(a、b)及镜下照片(c、d)

    Ms—白云母;Pl—斜长石;Mc—微斜长石;Qtz—石英

    Figure  3.   Field photographs(a, b)and photomicrographs(c, d)of sedimentary samples from the Guandu Group

    图  4   官都群沉积岩样品D0532-1(a)和D0533-9(b)锆石阴极发光图像和年龄值

    (比例尺均为50μm,年龄单位为Ma)

    Figure  4.   Cathodoluminescence images and ages of zircon grains of sample D0532-1 (a) and D0533-9 (b) from the Guandu Group

    图  5   官都群沉积岩样品锆石U-Pb谐和图

    Figure  5.   Zircon U-Pb concordia diagrams of two sedimentary samples from the Guandu Group

    图  6   前人已发表的官都群变质沉积岩样品锆石U–Pb谐和图和年龄分布直方图

    (a、b、c、h、i、j数据据参考文献[12];d、k据参考文献[11];e、f、l、m据参考文献[22];g、n据参考文献[14];年龄分布直方图(o)包括本文和上述所有数据)

    Figure  6.   Zircon U-Pb concordia plots and relative probability diagrams of 207Pb/206Pb ages for sedimentary samples of the Guandu Group published by other researchers

    表  1   官都群变质沉积岩样品锆石SHRIMP U-Th-Pb年龄数据

    Table  1   SHRIMP U-Th-Pb ages of zircons from the meta-sedimentary rocks of the Guandu Group

    测点 U/10-6 Th/10-6 Th/U 206Pb* 207Pb*/206Pb* 207Pb*/235U* 206Pb*/238U* 错误校正 206Pb/238U/Ma 207Pb/206Pb年龄/Ma 不谐和度/%
    D0533-9
    D0533-9-1.1 804 20 0.03 264 0.1524 1.79 7.970 3.1 0.3794 2.52 0.82 2074 45 2388 30 13
    D0533-9-2.1 306 20 0.07 126 0.1619 0.46 10.679 0.9 0.4784 0.75 0.85 2520 16 2487 9 -1
    D0533-9-3.1 939 3 0 319 0.1627 0.30 8.796 1.0 0.3921 0.96 0.95 2133 18 2509 6 15
    D0533-9-4.1 865 20 0.02 341 0.1593 0.29 10.012 0.8 0.4558 0.70 0.92 2421 14 2462 6 2
    D0533-9-5.1 1232 14 0.01 458 0.1597 0.30 9.420 0.8 0.4278 0.77 0.93 2296 15 2475 7 7
    D0533-9-6.1 222 13 0.06 86 0.1647 0.71 10.169 1.1 0.4479 0.81 0.75 2386 16 2503 13 5
    D0533-9-7.1 838 17 0.02 231 0.1593 0.33 7.026 0.7 0.3199 0.66 0.89 1789 10 2448 7 27
    D0533-9-8.1 301 16 0.05 126 0.1641 0.46 10.976 1.1 0.4850 1.03 0.91 2549 22 2508 8 -2
    D0533-9-9.2 550 25 0.05 157 0.1477 0.43 6.729 0.8 0.3303 0.67 0.84 1840 11 2332 8 21
    D0533-9-10.1 1273 478 0.39 249 0.1583 0.31 4.993 0.7 0.2287 0.64 0.90 1328 8 2300 10 42
    D0533-9-11.1 246 101 0.42 107 0.1756 0.48 12.210 1.1 0.5042 0.95 0.89 2632 22 2591 11 -2
    D0533-9-12.1 297 17 0.06 123 0.1645 0.46 10.904 0.9 0.4809 0.75 0.85 2531 16 2508 9 -1
    D0533-9-13.1 343 92 0.28 106 0.1587 1.96 7.847 2.2 0.3586 0.98 0.45 1976 30 2408 35 18
    D0533-9-14.1 259 26 0.1 97 0.1597 0.49 9.526 1.0 0.4326 0.90 0.88 2317 18 2458 10 6
    D0533-9-15.1 499 51 0.11 176 0.1475 0.50 8.082 0.9 0.3975 0.69 0.81 2158 14 2483 10 13
    D0533-9-16.1 330 248 0.78 139 0.1627 0.44 11.008 0.9 0.4908 0.74 0.86 2574 17 2488 8 -3
    D0533-9-17.1 763 19 0.03 139 0.1286 6.20 3.741 8.2 0.2109 5.44 0.66 1234 62 2059 111 40
    D0533-9-18.1 747 145 0.2 327 0.1609 0.50 11.177 0.9 0.5040 0.71 0.82 2631 16 2472 11 -6
    D0533-9-19.1 248 164 0.68 104 0.1627 0.50 10.917 0.9 0.4866 0.78 0.84 2556 18 2494 8 -2
    D0533-9-20.1 356 5 0.01 105 0.1562 0.57 7.348 0.9 0.3412 0.76 0.80 1893 13 2429 11 22
    D0533-9-21.1 295 215 0.75 123 0.1605 0.47 10.700 1.3 0.4834 1.17 0.93 2542 27 2472 8 -3
    D0532-1
    D0532-1-1.1 166 134 0.83 67 0.1782 0.58 11.735 1.0 0.4775 0.86 0.83 2517 20 2505 11 0
    D0532-1-2.1 60 33 0.57 27 0.1646 0.96 11.649 1.5 0.5132 1.19 0.78 2670 28 2562 15 -4
    D0532-1-3.1 120 79 0.67 51 0.1668 0.73 11.401 1.2 0.4957 0.95 0.79 2595 23 2493 13 -4
    D0532-1-4.1 407 299 0.76 154 0.1799 0.40 11.139 0.8 0.4492 0.73 0.87 2392 16 2479 9 4
    D0532-1-5.1 170 105 0.64 70 0.1591 0.62 10.453 1.1 0.4766 0.88 0.82 2513 20 2442 11 -3
    D0532-1-6.1 231 202 0.9 88 0.1658 0.49 10.190 1.7 0.4457 1.67 0.96 2376 40 2422 11 2
    D0532-1-7.1 213 207 1.01 68 0.1522 0.62 7.854 1.1 0.3742 0.89 0.82 2049 19 2341 15 12
    D0532-1-8.1 243 343 1.46 74 0.1637 0.57 7.955 1.0 0.3523 0.79 0.81 1946 17 2440 14 20
    D0532-1-9.1 73 66 0.94 31 0.1590 0.93 10.951 1.5 0.4994 1.13 0.77 2611 28 2479 15 -5
    D0532-1-10.1 192 171 0.92 79 0.1648 0.57 10.809 1.2 0.4758 1.08 0.88 2509 26 2515 10 0
    D0532-1-11.1 121 64 0.55 51 0.1645 0.77 11.184 1.2 0.4932 0.93 0.77 2585 21 2515 16 -3
    D0532-1-12.1 158 78 0.51 68 0.1637 0.63 11.324 1.1 0.5018 0.86 0.81 2622 20 2515 10 -4
    D0532-1-13.1 91 82 0.93 38 0.1608 0.86 10.807 1.3 0.4875 1.02 0.77 2560 25 2500 16 -2
    D0532-1-14.1 332 239 0.74 128 0.1655 0.44 10.229 0.9 0.4484 0.77 0.87 2388 17 2515 8 5
    D0532-1-14.2 171 67 0.41 69 0.1584 0.58 10.202 1.0 0.4670 0.84 0.82 2471 18 2473 11 0
    D0532-1-15.1 148 53 0.37 64 0.1695 0.60 11.731 1.1 0.5020 0.88 0.82 2622 20 2553 11 -3
    注:Pb *表示放射性成因铅,不谐和度=1-100 *(206Pb/238U)age/(207Pb/206Pb)age
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-01-09
  • 修回日期:  2019-03-16
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2019-08-14

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