青海循化盆地晚更新世沉积序列与古气候

韩芳; 张克信; 韦一; 季军良; 徐亚东; 陈奋宁; 寇晓虎

doi:10.3799/dqkx.2010.098

青海循化盆地晚更新世沉积序列与古气候

doi: 10.3799/dqkx.2010.098

韩芳^{1, 2,},
张克信^{1, 2, 3, ,},
韦一²,
季军良^{1, 2},
徐亚东^{1, 2},
陈奋宁⁴,
寇晓虎^{1, 3}

1.
中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国地质大学地质调查研究院, 湖北武汉 430074
4.
西安地质矿产研究所, 陕西西安 710054

基金项目:

中国地质调查局项目 1212010610103

国家自然科学基金项目 40921062

国家自然科学基金项目 40830212

国家地质学理科基地人才培养基金 J0830520

详细信息

作者简介:
韩芳(1987-), 女, 硕士研究生, 主要从事微体古生物学及生态学研究.E-mail: smilehf912@163.com

通讯作者:
张克信, E-mail: kx_zhang@cug.edu.cn

中图分类号: Q913
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- 文章访问数: 3230
- HTML全文浏览量: 64
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- 被引次数: 0
出版历程
- 收稿日期: 2010-05-31
- 刊出日期: 2010-09-01

Sedimentary Sequences and Paleoclimate of Late Pleistocene in Xunhua Basin, Qinghai Province

HAN Fang^{1, 2
,},
ZHANG Ke-xin^{1, 2, 3
, ,},
WEI Yi²,
JI Jun-liang^{1, 2},
Xu Ya-dong^{1, 2},
CHEN Fen-ning⁴,
KOU Xiao-hu^{1, 3}

1.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faulty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Geological Survey of China University of Geosciences, Wuhan 430074, China
4.
Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, China

摘要

摘要: 河流阶地作为河谷中常见地貌, 其堆积物特征对气候变化过程研究具有重要的意义.通过对循化黄河Ⅲ级阶地剖面沉积特征、粒度、磁化率、孢粉以及光释光测年的研究, 初步厘定循化黄河Ⅲ级阶地形成时代为75 ka.循化盆地晚更新世气候演化可以大致划分为6个阶段: 120~114 ka, 气候暖湿; 114~105 ka, 气候较为干冷; 105~98 ka, 气候较暖湿; 98~85 ka, 气候转为温凉; 85~75 ka, 气候暖湿; 75~63 ka, 气候干冷.这6个阶段分别与MIS5e-4段相对应.
- 河流阶地 /
- 粒度 /
- 磁化率 /
- 环境演变 /
- 循化盆地
Abstract: Sedimentological analyses of the third terrace along the banks of the Yellow River in Xunhua basin have yielded results that have more than regional significance. They are concerned with the reaction of rivers to climatic changes in the Pleistocene. Based on the field investigations, granularity, magnetic susceptibility, palynological records and optically stimulated luminescence (OSL) dating, the age of the third terrace was revealed. It shows that the Yellow River incised during the transition from interglacial to glacial. Evidences show that the paleoclimate and environment in Xunhua basin during the Late Pleistocene can be roughly divided into six stages: (1) 120—114 ka, the climate was warm and moist; (2) 114—105 ka, the climate turned cool and dry; (3) 105—98 ka, the climate was relatively warm and humid; (4) 98-85 ka, the climate turned cool and temperature; (5) 85—75 ka, the climate was warm and humid; (6) 75—63 ka, the climate was cold and dry, which can be compared with high-resolution ice core and marine oxygen isotope climate series.
- river terrace /
- granularity /
- magnetic susceptibility /
- environment evolution /
- Xunhua basin

HTML全文

图 1 研究区交通位置及地质简图(据中国地质大学地质调查研究院(2006) 修改^①)

1.全新统；2.上更新统；3.中更新统；4.上新统积石组；5.中上新统临夏组；6.渐-中新统咸水河组；7.渐-中新统他拉组；8.下白垩统河口群一组；9.下白垩统河口群二组；10.下三叠统江里沟组；11.上寒武系六道沟组；12.元古界化隆岩群；13.早奥陶世灰绿色中粒石英闪长岩；14.奥陶纪灰绿色石英闪长岩；15.三级阶地；16.逆断层；17.正断层；18.实测地质界线；19.实测角度不整合界限；20.侵入界限；21.剖面位置

Fig. 1. The traffic location and geological map of the study area

下载: 全尺寸图片幻灯片

图 2 青海循化盆地Ⅲ级阶地剖面综合柱状图

岩性岩相柱中：1.泥，2.粉砂，3.细砂，4.中砂，5.粗砂，6.细砾，7.巨砾；典型露头照片：1.Ⅲ级阶地⑦层河床滞留沉积，砾石具叠瓦状构造；2.Ⅲ级阶地⑥层曲流沙坝沉积，发育波状交错层理；3.Ⅲ级阶地⑤层天然堤沉积，砂泥互层，发育水平层理；4.Ⅲ级阶地④层曲流沙坝沉积，多个正粒序旋回组成，发育平行层理、泥裂；5.Ⅲ级阶地③层天然堤沉积，砂泥互层；6.Ⅲ级阶地②层曲流沙坝沉积，正粒序旋回组成，砾石含量较多，砾石具叠瓦状构造，发育水平层理；7.Ⅲ级阶地①层次生黄土沉积，块状；图例：1.砾岩，2.粗砂岩，3.细砂岩，4.粉砂岩，5.泥岩，6.黄土，7.叠瓦状构造，8.平行层理，9.爬升层理，10.正粒序层理，11.泥裂，12.水平层理，13.楔状交错层理，14.板状交错层理，15.含砾砂岩，16.泥质粉砂

Fig. 2. Stratigraphic profile of the third terrace in Xuhua basin, Qinghai Province

下载: 全尺寸图片幻灯片

图 3 研究区沉积剖面晚更新世沉积模式示意

Fig. 3. Depositional model for sedimentary section of Late Pleistocene in the study area

下载: 全尺寸图片幻灯片

图 4 循化盆地黄河Ⅲ级阶地沉积物磁化率与粒度组分对比(图例同图 2)

Fig. 4. Comparison diagram of magnetic susceptibility and granularity for the third terrace of the Yellow River in Xunhua basin

下载: 全尺寸图片幻灯片

表 1 循化黄河Ⅲ级阶地光释光测年结果和参数

Table 1. Analytical results of OSL and their parameters of sediments from the third terrace of the Yellow River in Xunhua basin

样品编号	野外编号	U (‰)	Th (‰)	K (%)	等效剂量 E.D (Gy)	年剂量Dy (Gy/Ka)	年龄 (Ka)
08G-350	S21-2-1	2.71	13.60	1.40	393.73±24.63	3.48	113.6±8.4
08G-351	S21-30-3	1.88	8.09	1.59	317.81±19.86	3.04	104.4±7.7
08G-352	S21-57-1	3.12	10.20	1.94	250.75±10.42	3.99	62.8±3.6

下载: 导出CSV

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