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川西高原毛垭坝盆地全新世气候变化

邹司雅 季军良 徐亚东 朱宁

邹司雅, 季军良, 徐亚东, 朱宁. 川西高原毛垭坝盆地全新世气候变化[J]. 地质科技通报, 2024, 43(1): 173-183. doi: 10.19509/j.cnki.dzkq.tb20220278
引用本文: 邹司雅, 季军良, 徐亚东, 朱宁. 川西高原毛垭坝盆地全新世气候变化[J]. 地质科技通报, 2024, 43(1): 173-183. doi: 10.19509/j.cnki.dzkq.tb20220278
ZOU Siya, JI Junliang, XU Yadong, ZHU Ning. Holocene climate change in the Maoyaba Basin, western Sichuan Plateau[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 173-183. doi: 10.19509/j.cnki.dzkq.tb20220278
Citation: ZOU Siya, JI Junliang, XU Yadong, ZHU Ning. Holocene climate change in the Maoyaba Basin, western Sichuan Plateau[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 173-183. doi: 10.19509/j.cnki.dzkq.tb20220278

川西高原毛垭坝盆地全新世气候变化

doi: 10.19509/j.cnki.dzkq.tb20220278
基金项目: 

国家自然科学基金项目 42274105

中国地质调查局项目 DD20190811

中国地质调查局项目 DD20190370

详细信息
    作者简介:

    邹司雅, E-mail: ZouSY@cug.edu.cn

    通讯作者:

    季军良, E-mail: jijl@cug.edu.cn

  • 中图分类号: P532

Holocene climate change in the Maoyaba Basin, western Sichuan Plateau

More Information
  • 摘要:

    在西风带、东亚季风和印度季风的共同影响下,青藏高原不同区域全新世气候变化过程存在显著差异,加强不同区域古气候变化研究对重建青藏高原全新世气候变化过程及理解其变化机制具有重要意义。以青藏高原东部川西高原理塘县毛垭坝盆地全新世地层为研究对象,在14C测年的基础上,通过沉积环境和多个古气候代用指标的分析,重建了全新世气候变化过程。毛垭坝盆地早-中全新世冰水湖沉积物覆盖在末次冰期冰碛物之上,晚全新世为冲洪积物。全新世沉积物在筛除砾石(粒径>2 mm)后的粒度组成以中粉砂以下粒级(粒径 < 32 μm)为主,占比多>80%,是冰川磨蚀作用的产物。磁化率在古土壤层明显增大,结合粒径 < 1 μm粒度组分的出现,可能说明成壤作用生成的强磁性矿物是磁化率值增大的原因。在冰水湖还原环境中磁化率值显著减小,可能与磁性矿物溶解有关。结合总有机碳(TOC)和色度参数的综合分析表明,毛垭坝盆地早全新世气候温干,中全新世暖湿,晚全新世温干,这一变化过程与青藏高原东部全新世气候变化总的趋势相符。在晚全新世气候温干的趋势下,毛垭坝盆地在2 700 a BP古土壤发育,气候温湿。

     

  • 图 1  川西高原毛垭坝盆地地理位置(a)、地貌(b)和地质图(c)

    Figure 1.  Geographic location(a), geomorphology(b) and geological map(c) of the Maoyaba Basin, western Sichuan Plateau

    图 2  剖面PM100和PM101照片与岩性(年龄为14C测年结果)

    Figure 2.  Photos and lithology of the PM100 and PM101 profiles(14C age on the picture)

    图 3  剖面PM100和PM101沉积物粒度的频率曲线(筛除粒径>2 mm颗粒后)

    Figure 3.  Frequency curves of grain size of sediments from the PM100 and PM101 profiles(after sieving out >2 mm particles)

    图 4  毛垭坝盆地PM100和PM101剖面古环境代用指标与气候变化(Md为中值粒径; χlf为低频磁化率; χfd为频率磁化率; TOC为总有机碳; a*为红度; L*为亮度)

    Figure 4.  Paleoenvironmental proxies and climate change of the PM100 and PM101 profiles in the Maoyaba Basin

    图 5  青藏高原东部全新世气候变化与东亚地区的对比

    a.孢粉重建的青藏高原东部古温度[38];b.孢粉重建的青藏高原东南部湿度指数[39];c.青藏高原东部树木孢粉平均Z分数标准化曲线[1];d.董哥洞石笋δ18O[38];绿色阴影为全新世最暖湿期,灰色阴影为毛垭坝盆地2.8 ka古土壤记录的温湿气候,黄色阴影为2.8 ka东亚夏季风减弱事件

    Figure 5.  Comparison of Holocene climate in the eastern Tibetan Plateau and east Asia

    表  1  PM100和PM101剖面14C测年结果

    Table  1.   14C dating results of the PM100 and PM101 profiles

    实验室编号 野外编号 深度/cm AMS14C年龄/a BP 校正后年龄/a BP(2σ)
    Beta-563210 PM101-3 135 9 290±30 10 486±94
    Beta-563211 PM101-4 118 4 980±30 5 697±56
    Beta-563208 PM100-2-1 40 2 540±30 2 716±32
    Beta-563209 PM100-4-1 10 110±0.4 -49±2
    注:测试单位为美国Beta实验室;测试仪器为NEC加速器质谱仪和Thermo同位素比值质谱仪
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  • 收稿日期:  2022-06-17
  • 录用日期:  2022-07-31
  • 修回日期:  2022-07-25

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