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晚泥盆世大陆风化作用增强及其海洋环境效应:来自华南碳酸盐岩锶同位素的制约

邓发亮 刘希军 余红霞 杨锋 袁永海

邓发亮, 刘希军, 余红霞, 杨锋, 袁永海. 晚泥盆世大陆风化作用增强及其海洋环境效应:来自华南碳酸盐岩锶同位素的制约[J]. 地质科技通报, 2022, 41(4): 207-214. doi: 10.19509/j.cnki.dzkq.2021.0071
引用本文: 邓发亮, 刘希军, 余红霞, 杨锋, 袁永海. 晚泥盆世大陆风化作用增强及其海洋环境效应:来自华南碳酸盐岩锶同位素的制约[J]. 地质科技通报, 2022, 41(4): 207-214. doi: 10.19509/j.cnki.dzkq.2021.0071
Deng Faliang, Liu Xijun, Yu Hongxia, Yang Feng, Yuan Yonghai. Enhanced continental weathering and its marine environmental effects in the late Devonian: Constraints from strontium isotopes of carbonate rocks in South China[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 207-214. doi: 10.19509/j.cnki.dzkq.2021.0071
Citation: Deng Faliang, Liu Xijun, Yu Hongxia, Yang Feng, Yuan Yonghai. Enhanced continental weathering and its marine environmental effects in the late Devonian: Constraints from strontium isotopes of carbonate rocks in South China[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 207-214. doi: 10.19509/j.cnki.dzkq.2021.0071

晚泥盆世大陆风化作用增强及其海洋环境效应:来自华南碳酸盐岩锶同位素的制约

doi: 10.19509/j.cnki.dzkq.2021.0071
基金项目: 

广西自然科学基金杰出青年科学基金项目 2018GXNSFFA281009

广西八桂学者项目 2018, 有色金属成矿理论与勘查技术

详细信息
    作者简介:

    邓发亮(1992—), 男, 现正攻读地球化学专业博士学位, 主要从事地球化学研究工作。E-mail: 943687331@qq.com

    通讯作者:

    余红霞(1986—), 女, 实验师,主要从事同位素地球化学研究工作。E-mail: 405244819@qq.com

  • 中图分类号: P597;P534.44

Enhanced continental weathering and its marine environmental effects in the late Devonian: Constraints from strontium isotopes of carbonate rocks in South China

  • 摘要:

    上泥盆统弗拉斯阶和法门阶界线附近发生了大规模的生物灭绝, 其起因被认为是植物登陆导致的陆地化学风化作用加强及其引起的海洋水体缺氧所致, 但其直接证据还比较缺乏。运用广西地区广泛发育的浅海碳酸盐岩中锶元素(Sr)和同位素(87Sr/86Sr)、铀钍比值(U/Th)记录, 探究了从中泥盆统到下石炭统的陆地化学风化速率及海水氧化还原条件的变化。研究结果表明, 在晚泥盆世(法门阶早期)陆地化学风化作用加强, 导致海水中Sr浓度升高, 及更富集重的Sr同位素组分; 低的U/Th比值也显示该时期水体缺氧严重, 海水中U元素被还原到沉积物中, 导致海水中的U浓度降低。陆地表面化学风化的加强对晚泥盆世海洋水体氧化还原条件的波动以及海洋生物的灭绝有重要影响。

     

  • 图 1  研究区域地质图和采样点位置

    Figure 1.  A simplified geological map of the study area and sample locations

    图 2  研究剖面的采样位置和样品岩性描述

    Figure 2.  Sample location and lithological descriptions

    图 3  镜下矿物组成(a.正交镜下)和化石(b.偏光镜下)

    Figure 3.  Micrographs of mineral assemblage (a) and fossils (b)

    图 4  研究剖面的地球化学曲线

    a.w(Sr)变化曲线;b.锶同位素(87Sr/86Sr)变化曲线,Sr同位素高值表示陆源输入量大;c.U/Th值变化曲线,碳酸盐岩U/Th值越高表明水体越氧化

    Figure 4.  Geochemical variation curves of the studied lithological section

    图 5  U/Th和Sr同位素的散点图

    红色的点表示五指山组下部的样品,黑色的点表示东岗岭组、五指山顶部和岩关组的样品

    Figure 5.  Scatter plots of U/Th and Sr isotopes

    表  1  Sr同位素、Sr、Th、U质量分数和U/Th比值

    Table  1.   Sr isotope, Sr, Th and U concentrations, and U/Th ratios

    样品编号 87Sr/86Sr RSD/ 10-6 Sr Th U U/Th
    wB/10-6
    2016YD-001 0.709 713 6.614 6 102 0.31 0.59 1.93
    2016YD-002 0.709 084 11.076 6 33 0.06 0.28 5.07
    2016YD-003 0.710 457 16.466 3 40.7 0.15 0.58 3.96
    2016YD-004 0.708 131 14.563 1 167 0.11 1.04 9.68
    2016YD-005 0.708 145 16.646 6 108 0.13 1.64 12.90
    2016YD-006 0.708 048 11.708 1 295 0.24 1.86 7.72
    2016YD-007 0.708 704 12.870 3 47.7 0.15 0.59 3.91
    2016YD-008 0.708 414 18.139 7 2 037 0.24 1.88 7.91
    2016YD-009 0.708 114 11.554 8 263 0.09 0.52 5.80
    2016YD-010 0.711 489 17.995 7 265 3.48 0.83 0.24
    2016YD-011 0.710 455 16.073 6 614 4.01 0.84 0.21
    2016YD-012 0.710 131 16.522 1 154 1.05 0.70 0.67
    2016YD-013 0.708 340 17.426 4 723 0.07 0.27 3.86
    2016YD-014 0.707 987 16.349 6 341 0.06 0.35 6.12
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