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

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

邹司雅^1a,,
季军良^{1a, 1b, ,},
徐亚东^1c,
朱宁²

1a.
中国地质大学(武汉)地理与信息工程学院, 武汉 430074
1b.
中国地质大学(武汉)流域关键带演化湖北省重点实验室, 武汉 430074
1c.
中国地质大学(武汉)地球科学学院, 武汉 430074
2.
中国地质调查局自然资源实物地质资料中心, 河北廊坊 065201

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
计量
- 文章访问数: 451
- PDF下载量: 76
- 被引次数: 0
出版历程
- 收稿日期: 2022-06-17
- 录用日期: 2022-07-31
- 修回日期: 2022-07-25

Holocene climate change in the Maoyaba Basin, western Sichuan Plateau

ZOU Siya^{1a
,},
JI Junliang^{1a, 1b
, ,},
XU Yadong^1c,
ZHU Ning²

1a.
School of Geography and Information Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China
1b.
Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences(Wuhan), Wuhan 430074, China
1c.
School of Earth Sciences, China University of Geosciences(Wuhan), Wuhan 430074, China
2.
China Geological Survey Cores and Samples Center of Natural Resources, Langfang Hebei 065201, China

More Information

Author Bio:
ZOU Siya, E-mail: ZouSY@cug.edu.cn

Corresponding author: JI Junliang, E-mail: jijl@cug.edu.cn

摘要

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。
- 青藏高原 /
- 川西高原 /
- 毛垭坝盆地 /
- 全新世 /
- 气候变化
Abstract: Objective
The Holocene climate of the Tibetan Plateau (TP) is mainly controlled by midlatitude westerlies, the East Asian monsoon, and the Indian monsoon. Previous studies have identified different patterns of Holocene climate change in different regions of the TP. Holocene climate reconstructions for the entire TP help us comprehensively understand the internal linkages of different factors influencing the climate change in the TP.
Methods
In this paper, we study the Holocene climate in the eastern TP based on ¹⁴C dating, lithology and various proxies from the glaciolacustrine strata in the Maoyaba Basin in Litang County, western Sichuan Plateau.
Results
The Early-Middle Holocene glaciolacustrine sediments covered the last glacial moraines, and then the alluvial-proluvial fans were common during the Late Holocene in the Maoyaba Basin. The grain size of all samples mainly shows a bimodal size distribution after sieving out >2 mm particles. The content of the grain size below medium silt (< 32 μm) is more than 80%, which may be produced by glacial abrasion. The magnetic susceptibility increases obviously in the paleosol, and the appearance of < 1 μm particle size components may indicate that the strong magnetic minerals were generated by pedogenesis. However, the magnetic susceptibility decreased significantly in the glaciolacustrine sediments, which may be related to the dissolution of magnetic minerals in the reducing environment.
Conclusion
Comprehensive analysis of the sedimentary environment, grain size, magnetic susceptibility, total organic carbon (TOC) and color parameters indicates that the Maoyaba Basin was temperate and dry in the Early Holocene, warm and wet in the Middle Holocene, and temperate and dry in the Late Holocene. This pattern is consistent with the general trend of the Holocene climate in the eastern TP. The paleosol dated to~2 700 cal.yr. B.P. in the Maoyaba Basin indicates a relatively wet period against the background of cooling and a dry climate in the Late Holocene.
- Tibetan Plateau /
- western Sichuan Plateau /
- Maoyaba Basin /
- Holocene /
- climate change
注释:

所有作者声明不存在利益冲突。

HTML全文

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

下载: 全尺寸图片幻灯片

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)

下载: 全尺寸图片幻灯片

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)

下载: 全尺寸图片幻灯片

图 4 毛垭坝盆地PM100和PM101剖面古环境代用指标与气候变化(M_d为中值粒径; χ_lf为低频磁化率; χ_fd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

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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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