THE DISTRIBUTION AND PERIOD DIVISION OF HOLOCENE PALAEO CHANNELS OF THE YELLOW RIVER IN HETAO AREA
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摘要:
黄河古河道的分布及其年代学框架的建立对于探讨黄河迁移规律、重建古气候演化历史具有重要意义。通过Landsat8遥感影像解译、1：5万野外地质地貌调查、钻孔资料分析，结合剖面实测基本判定了色尔腾山以南至现代黄河以北河套平原区黄河埋藏古河道的分布，，采用OSL与14C测年较精确地确定了黄河古河道的年代。依据年代学研究结果，将全新世黄河古河道划分为三期：Ⅰ期古河道，分南北两支，南支分布在复兴镇西北部，埋深2~6 m，北支分布于呼勒斯太中南部，埋深8.2~9 m，时代为9.93~7.4 kaB.P.；Ⅱ期古河道，河道主体分布在色尔腾山山前，呈北西-南东向，埋藏于现今乌加河古河道下部4~11m处，南北最宽处约1.5km。塔尔湖区存在同一期的古河道，埋深7~9 m，以东西向展布为主，时代为7.4~4.1 kaB.P.；Ⅲ期古河道，呼勒斯太中部、塔尔湖中南部及复兴南部都曾发育，但河道主体为塔尔湖区的古河道，埋深2~9 m，时代为4.1~1.2 kaB.P.。黄河古河道分布及时代确定有助于更深入地研究黄河在河套段演化历史，为河套地区的水利建设和农业生产提供参考和借鉴。
Abstract:The distribution of palaeo channels of the Yellow River and the establishment of Chronological framework are of great significance to explore the rule of the Yellow River migration and reconstruct the history of palaeoclimate. Based on the Remote Sensing Image solution translation of Landsat 8 and the analysis of 1:50000 field geological and geomorphical survey and the drill data, combined with the measured profile, it is basically determined that there is the distribution of palaeo channels buried under the Modern Yellow River in Hetao Plain from the south of Seertang mountains to the north of modern Yellow River.In the meantime, using OSL and 14C dating, the age of the palaeo channels of the Yellow River are accurately determined.According to the results of chronology research, the palaeo channels of the Yellow River in Holocene are divided into three phases:Phase I, the palaeo channels were formed by north branch which spread in the northwest of Fuxing Town with the burial depth of 2~6 m and south branch which spread in the south central of Hulesitai with the burial depth of 8.2~9 m, and the age is 9.93~7.4 kaB.P; Phase Ⅱ, the principle parts of the palaeo channels mainly spread in front of the Seertang mountains, with the direction of NW-SE, buried at 4~11 m of the bottom of the palaeo channels of the Ugab River with the widest part of 1.5 km in NS direction. There were palaeo channels of the same phase in Taal Lake Areawith the burial depth of 7~9 m and its age is 7.4~4.1 ka B.P; Phase Ⅲ, the palaeo channels in the central Hulesitai, the south central of Taal Lake and the south of Fuxing once all developed, but the main bodies were the palaeo channels in Taal Lake Area, with the burial depth of 2~9 m, and the age is 4.1~1.2 ka B.P. The identification of distribution and ages of the palaeo channels of the Yellow River helps to study the evolution history of the Yellow River in Hetao Area and provides reference for water conservancy construction and agricultural production in Hetao Area.
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Key words:
- Hetao Area /
- palaeo channel of the Yellow River /
- OSL dating /
- 14C dating /
- Holocene (Qh)
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表 1 光释光年龄结果表
Table 1. The age of light release
原始编号 埋藏深度(cm) 含水率(%) U(ppm) Th(ppm) K(%) 剂量率(Gy/ka) 等效剂量(Gy) 年龄(ka) CJZ-HL-4A-12A 480~490 23±5 2.35±0.02 10.36±0.10 1.58±0.04 2.48±0.08 7.34±0.91 2.96±0.38 CJZ-HL-4A 877~900 21±5 1.08±0.01 5.54±0.03 1.56±0.02 1.94±0.07 15.62±1.12 8.05±0.65 CJZ-TEH-2A-9A 435~440 24±5 1.64±0.02 8.09±0.04 1.50±0.01 2.13±0.07 3.65±0.08 1.71±0.07 CJZ-TEH-2A 860~880 19±5 1.13±0.02 5.37±0.03 1.45±0.05 1.88±0.07 4.89±0.14 2.59±0.12 CJZ-FX-5A-12B 400~410 21±5 1.55±0.03 7.85±0.05 1.65±0.01 2.67±0.14 26.38±1.28 9.89±0.70 CJZ-FX-5A 560~568 20±5 1.16±0.01 5.94±0.05 1.54±0.01 2.00±0.08 19.88±1.46 9.93±0.82 
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表 2 14C年龄结果表
Table 2. 14C ages
原始编号 埋藏深度(cm) 年龄(ka) 备注 CJZ-HL-2B-21 770~775 4.260±30 CJZ-HL-2B-25 988~1000 4.640±30
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