PROGRESS IN GEOGRAPHY ›› 2020, Vol. 39 ›› Issue (8): 1319-1332.doi: 10.18306/dlkxjz.2020.08.007
• Articles • Previous Articles Next Articles
RONG Xiaoqing1(), PANG Jiangli1,*(
), HUANG Chunchang1, ZHOU Yali1, WANG Zhaoduo1, ZHANG Yuzhu2, GUO Yongqiang3, ZHAO Hui1, CHUI Yuda1
Received:
2019-06-13
Revised:
2019-09-26
Online:
2020-08-28
Published:
2020-10-28
Contact:
PANG Jiangli
E-mail:xiaoqing_rong816@163.com;jlpang@snnu.edu.cn
Supported by:
RONG Xiaoqing, PANG Jiangli, HUANG Chunchang, ZHOU Yali, WANG Zhaoduo, ZHANG Yuzhu, GUO Yongqiang, ZHAO Hui, CHUI Yuda. Prehistoric catastrophic surface processes and their impacts in the Guanting Basin, Qinghai Province[J].PROGRESS IN GEOGRAPHY, 2020, 39(8): 1319-1332.
Tab.1
Pedo-stratigraphic subdivision and descriptions in the Erfangcun soil profile of the Guanting Basin"
地层 | 深度/cm | 土壤学和沉积学特征描述 |
---|---|---|
现代耕作土壤(MS) | 0~50 | 浊棕色(7.5YR6/3),粉砂质地,团粒构造,疏松多孔,多蚯蚓孔和粪团,多植物根系 |
全新世晚期风成黄土(L0) | 50~100 | 浊橙色(7.5YR6/4),粗粉砂质地,团块构造,疏松多孔,少量蚯蚓孔和粪团,受到一定程度的成壤改造 |
全新世中期黑垆土上段(S0上) | 100~180 | 浊棕色(5YR5/3),粉砂质地,团粒构造,比较疏松,多蚯蚓孔和粪团,结构面有白色可溶盐类粉霜沉淀,为发育成熟度很高的黑垆土 |
灰烬层(ASL) | 180~210 | 棕灰色(5YR6/1),透镜状分布,轻盈细腻,粉砂质地,团块构造,松散易碎,灰烬成分为主,多木炭屑,含有个别破碎陶片,属于辛店文化 |
山洪砂土沉积层(FFD3) | 210~240 | 橙色(2.5YR6/6),细砂质地,断断续续的透镜状层,局部含有细小砾石,向沟坡上方尖灭,追索其物源为盆地北侧第三系红层丘陵沟壑区 |
山洪泥流沉积层(RC) | 240~325 | 上部橙色(2.5YR6/6),中下部亮红棕色(2.5YR5/6),粘土质地,棱块状构造,混杂有砂团和石子,显示出粘稠状态流动的内部构造,随微地形变化而波状起伏,厚度变化在40~200 cm之间,追索其物源为盆地北侧第三系红层丘陵沟壑区 |
山洪砂土层(FFD2) | 325~340 | 橙色(2.5YR6/6),细砂质地,断断续续的透镜状层,向沟坡上方尖灭,追索其物源为盆地北侧第三系红层丘陵沟壑区 |
全新世中期黑垆土下段(S0下) | 340~380 | 灰棕色(5YR6/2),粉砂质地,团粒构造,比较疏松,下部结构面和孔隙皆有白色可溶盐沉淀,为发育成熟度很高的黑垆土,为马家窑文化—齐家文化时期的耕作土壤 |
全新世早期风成黄土过渡层(Lt) | 380~410 | 过渡层(Lt),淡红灰色(2.5YR7/2),粗粉砂质地,块状构造,比较疏松,下部山洪砂土成分增多 |
沟道山洪砂土层(FFD1) | 410~? | 淡红灰色(2.5YR7/2),细砂质地,块状构造,比较疏松,来自于北部晚第三系红层丘陵沟壑区,山洪砂土性质显著,下部未见底 |
Tab.2
Optically-stimulated luminescence (OSL) dating results of the samples from the Erfangcun soil profile of the Guanting Basin[25] "
样品编号 | 深度/cm | U/(10-3 g·kg-1) | Th/(10-3 g·kg-1) | K/(g·kg-1) | 含水量/% | 环境剂量率Dy/(Gy/ka) | 等效剂量De/(Gy) | 年代/a |
---|---|---|---|---|---|---|---|---|
EFC-01 | 45~50 | 2.49±0.10 | 9.54±0.29 | 18.7±0.6 | 20±3 | 2.72±0.09 | 0.51±0.13 | 180±50 |
EFC-02 | 95~100 | 2.28±0.09 | 9.80±0.29 | 18.9±0.6 | 18±3 | 2.74±0.09 | 1.41±0.20 | 500±70 |
EFC-03 | 175~180 | 2.28±0.09 | 9.98±0.30 | 18.2±0.6 | 12±3 | 2.90±0.08 | 9.74±0.85 | 3350±230 |
EFC-04 | 195~200 | 2.17±0.09 | 9.68±0.29 | 20.6±0.6 | 20±3 | 2.86±0.08 | 9.24±0.37 | 3390±160 |
EFC-05 | 210~215 | 1.94±0.08 | 8.64±0.27 | 16.6±0.5 | 12±3 | 2.60±0.07 | 9.82±0.34 | 3780±170 |
EFC-06 | 340~345 | 3.06±0.12 | 9.60±0.29 | 18.9±0.6 | 10±3 | 3.13±0.09 | 12.33±0.52 | 3940±200 |
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