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吐哈盆地硫磺山铜多金属矿床表生黄钾铁矾40Ar/39Ar定年及对风化、地貌演化及古气候的启示

杨静 郑德文 陈文 武颖 许英霞 杨莉

杨静, 郑德文, 陈文, 等, 2017. 吐哈盆地硫磺山铜多金属矿床表生黄钾铁矾40Ar/39Ar定年及对风化、地貌演化及古气候的启示. 地质力学学报, 23 (2): 232-242.
引用本文: 杨静, 郑德文, 陈文, 等, 2017. 吐哈盆地硫磺山铜多金属矿床表生黄钾铁矾40Ar/39Ar定年及对风化、地貌演化及古气候的启示. 地质力学学报, 23 (2): 232-242.
YANG Jing, ZHENG De-wen, CHEN Wen, et al., 2017. 40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE JAROSITE FROM LIUHUANGSHAN COPPER POLYMETALLIC DEPOSITS IN Tu-Ha BASIN AND THE ENLIGHMENT TO WEATHERING, LANDSCAPE EVOLUTION AND PALEOCLIMATE. Journal of Geomechanics, 23 (2): 232-242.
Citation: YANG Jing, ZHENG De-wen, CHEN Wen, et al., 2017. 40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE JAROSITE FROM LIUHUANGSHAN COPPER POLYMETALLIC DEPOSITS IN Tu-Ha BASIN AND THE ENLIGHMENT TO WEATHERING, LANDSCAPE EVOLUTION AND PALEOCLIMATE. Journal of Geomechanics, 23 (2): 232-242.

吐哈盆地硫磺山铜多金属矿床表生黄钾铁矾40Ar/39Ar定年及对风化、地貌演化及古气候的启示

基金项目: 

国家自然科学基金项目 41403047

国家自然科学基金项目 41272215

中国地质调查局地质调查项目"特殊地质地貌区填图试点 DD20160060

详细信息
    作者简介:

    杨静(1984-), 女, 助理研究员, 主要从事热年代学研究。Email:yangjing_822822@163.com

  • 中图分类号: P597

40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE JAROSITE FROM LIUHUANGSHAN COPPER POLYMETALLIC DEPOSITS IN Tu-Ha BASIN AND THE ENLIGHMENT TO WEATHERING, LANDSCAPE EVOLUTION AND PALEOCLIMATE

  • 摘要: 黄钾铁矾是干旱—半干旱地区硫化物矿床氧化带中一种常见表生含钾硫酸盐矿物,对其进行40Ar/39Ar年代学研究,不仅可以直接限定硫化物矿床次生富集的时间,还可以为区域地貌形成演化和古气候演变等重大地质事件提供关键的年代学信息。本文对中国新疆吐哈盆地硫磺山铜多金属矿床氧化带中三个表生黄钾铁矾样品进行了40Ar/39Ar定年,第一次获得了始新世的风化矿物的年龄。结合已发表的年龄数据显示:在吐哈盆地,海拔较高的矿床氧化带剖面(如硫磺山矿床)记录了基岩的持续和较完整的区域风化事件,这些老的风化年龄的存在证明了剥蚀并不是均匀的,即其地貌演化遵循的是斜坡后退模型。对于吐哈盆地的古气候,这些表生硫酸盐的年龄表明:始新世以来吐哈盆地曾多次出现过有利于化学风化和硫化物矿床次生富集的干旱—半干旱气候,且主要集中在以下几个时期:27.7~23.3 Ma、16.4~14.7 Ma、11~7.8 Ma,之后气候开始向极端干旱气候转变,4.1~3.3 Ma之后吐哈盆地可能已经流行大规模的极端干旱气候。

     

  • 图  1  硫磺山铜—多金属矿床地质简图[26~27]

    1—第四纪冲积物、洪积物;2—中上奥陶统硫磺山群灰岩、角砾状灰岩和结晶灰岩;3—硫磺山群结晶生物碎屑灰岩和泥质页岩;4—硫磺山群硅质岩夹灰岩透镜体;5—硫磺山群细砂岩夹安山岩和灰岩透镜体;6—碧玉岩;7—安山岩;8—灰白色石英斑岩;9—海西期草绿色石英斑岩;10—云斜煌斑岩;11—矿体;12—断层

    Figure  1.  Geological sketch of Liuhuangshan copper-polymetallic deposit

    图  2  硫磺山多金属矿床氧化带中黄钾铁矾的采集剖面

    Figure  2.  The profile of jarosite sampling of Liuhuangshan copper-polymetallic deposit

    图  3  三个黄钾铁矾样品的扫描电子显微镜的背散射电子图像及其对应的能谱分析

    a、b-黄钾铁矾的六方双锥晶形(LHS-06、LHS-10);c-黄钾铁矾的假立方体晶形 (LHS-09)

    Figure  3.  SEM images (back-scattered electron) and corresponding energy dispersive spectrum analysis of three jarosite samples

    图  4  硫磺山矿床三个黄钾铁矾样品的年龄坪与其对应的反等时线图

    黑色圆圈表示用于计算反等时线年龄的阶段,蓝色的圆圈表示没有用于计算反等时线年龄的阶段

    Figure  4.  Age spectra and comesponding isochrons of three jarosite samples from the Liuhuangshan deposit

    图  5  吐哈盆地表生硫酸盐矿物年龄—高程相关性图解

    Figure  5.  Diagram of age-elevation relevance of supergene sulfate mineral from Tuha Basin

    图  6  差异风化与侵蚀—斜坡后退模型示意图[30]

    Figure  6.  Diagram of differential weathering and erosion-scarp retreat model

    表  1  硫磺山铜多金属矿床氧化带中三个表生黄钾铁矾激光加热40Ar/39Ar同位素分析结果

    Table  1.   40Ar/39Ar laser incremental heating analysis results of the three jarosite samples from the Liuhuangshan deposit

    加热阶段激光功率/%36Ar(a)/计数37Ar(ca)/计数38Ar(cl)/计数39Ar(k)/计数40Ar(r)/计数年龄/Ma误差(1σ)/Ma40Ar(r)/%39Ar(k)/%
    LHS-06 J=0.00220320±0.00000110
    0012.4454038.50.02773.664247.113368103682.38±7.089.062.65
    0023.0233013.20.01335.2101071.35619147208.95±3.617.554.17
    0034.0285811.60.01556.6212203.07286304131.87±1.627.948.75
    0044.5155599.70.0952.1195338.1376471975.20±1.597.578.06
    0055.0152475.70.0600.7146294.8320106585.14±1.496.636.04
    0065.5128673.30.0518.2164419.9303375472.06±0.977.396.78
    0076.0115599.20.0174.2150989.6256353566.41±2.106.986.23
    0087.0*95055.30.074.5141718.1198929355.08±1.056.615.85
    0097.0*96472.00.043.2142632.5199571754.90±1.136.545.88
    0107.5*85700.40.0235.8157629.8222379755.35±0.888.076.50
    0118.0*87532.70.00.0132210.7189461556.21±0.416.825.45
    0128.5*64408.40.00.0109467.6156344156.02±0.857.594.52
    0139.0*74693.90.045.8129864.5184614855.77±0.437.725.36
    0149.5*74136.30.00.0117584.8162355954.19±0.816.904.85
    01510.0*73072.10.00.0119674.2169941255.71±0.727.304.94
    01611.0*62290.30.085.8150716.4212412455.30±0.9410.356.22
    01712.0*81394.00.0244.0187740.6266723755.73±0.929.987.75
    LHS-10 J=0.00210794±0.00000105
    0012.0161095.00.073.113429.82167823529.59±18.154.360.50
    0022.5550143.60.03864.9183920.514972852286.39±2.288.436.89
    0033.0234508.20.0831.2149724.14128850102.17±2.475.625.61
    0043.5256799.30.01682.8275988.8553656274.90±1.356.8010.34
    0054.0*195954.510988.01546.5308577.1392852847.89±0.446.3511.56
    0064.5*225492.90.01415.3318946.4407995448.11±0.365.7711.95
    0075.0*162256.90.0714.9218448.5281532648.47±0.935.558.19
    0085.5*126834.7809.1903.0196424.3253708248.58±0.756.347.36
    0096.0*128162.50.0891.1198922.7267740450.59±1.496.607.46
    0106.5*134377.20.01204.3195851.6249002847.82±0.515.907.34
    0117.0*109442.80.0885.3163467.0211850948.74±0.616.156.13
    0128.0*146880.50.01208.9215033.4272625647.69±0.885.918.06
    0139.0*153847.80.01398.3229536.7296563448.59±1.166.128.60
    LHS-09 J=0.00212410±0.00000106
    0012.4142867.10.00.0201530.6221489541.73±1.004.985.96
    0023.038686.20.00.0196007.1137817926.81±0.5310.765.79
    0034.024548.10.00.0326348.3256830629.98±0.2326.159.65
    0044.522817.10.00.0281584.3267485636.12±0.2328.408.32
    0055.0*20227.40.00.0241377.7256924840.43±0.3130.067.14
    0066.0*21655.90.00.0335786.0355099540.17±0.1935.699.93
    0077.0*27901.90.056.5364837.3390713240.67±0.4032.1510.79
    0088.0*15111.10.00.0227155.5239921840.12±0.2134.956.72
    0099.0*14495.40.00.0206766.8218026740.06±0.3133.736.11
    01010.0*11146.60.00.0203458.7213717839.90±0.2039.356.01
    01111.0*12904.90.00.0196015.9207497140.21±0.4235.245.79
    01212.0*10271.70.00.0175183.3193676541.97±2.3138.955.18
    01313.0*12078.50.00.0185073.3197484040.53±0.2035.625.47
    01415.0*12292.10.00.0241450.1257325840.48±0.1841.467.14
    下载: 导出CSV

    表  2  三个表生黄钾铁矾40Ar/39Ar年龄结果

    Table  2.   Results of 40Ar/39Ar ages of three jarosite samples from Liuhuangshan deposit

    样品样品颗粒坪年龄Age/Ma反等时线年龄/Ma40Ar/36Ar说明
    LHS-06LHS-06-155.6±0.255.0±1.7295.8±0.8微小39Ar反冲, 坪年龄
    LHS-10LHS-10-148.2±0.248.6±4.3295.3±1.8微小39Ar反冲, 坪年龄
    LHS-09LHS-09-140.3±0.140.1±0.6296.5±2.5坪年龄
    下载: 导出CSV
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  • 收稿日期:  2016-11-01
  • 刊出日期:  2017-04-28

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