冰川冻土 ›› 2021, Vol. 43 ›› Issue (3): 735-746.doi: 10.7522/j.issn.1000-0240.2021.0015
收稿日期:
2021-05-22
修回日期:
2021-06-07
出版日期:
2021-06-30
发布日期:
2021-05-18
通讯作者:
周尚哲,杨太保
E-mail:xiejinming666@163.com;szzhou@scnu.edu.cn;yangtb@lzu.edu.cn
作者简介:
谢金明,博士研究生,主要从事第四纪冰川研究. E-mail: 基金资助:
Jinming XIE1(),Shangzhe ZHOU2(
),Liubing XU2,Taibao YANG1(
)
Received:
2021-05-22
Revised:
2021-06-07
Online:
2021-06-30
Published:
2021-05-18
Contact:
Shangzhe ZHOU,Taibao YANG
E-mail:xiejinming666@163.com;szzhou@scnu.edu.cn;yangtb@lzu.edu.cn
摘要:
西藏东南部的“古乡冰期”和“白玉冰期”是划分中国第四纪冰期的蓝本。其中,白玉冰期即末次冰期,分为早阶段和晚阶段,相对应的冰川沉积广泛分布于本区的波堆藏布谷地。已有的冰川数值年代结果显示,末次冰期晚阶段的冰川作用发生于海洋氧同位素阶段(MIS)2。然而,关于早阶段的冰进记录,目前却未有确切的年代学证据,此次冰川作用究竟发生于MIS 4还是MIS 3,是一个悬而未决的问题。在前人研究及野外地貌调查的基础上,运用光释光测年手段对波堆藏布谷地疑似形成于末次冰期早阶段的冰碛垄进行测年,年代结果介于(56.4±4.2)~(65.9±3.9) ka之间,相当于MIS 4。藏东南地区MIS 4冰期冰川作用年代与青藏高原及其周边山地具有可比性,表明该阶段冰川作用发生的普遍性。通过对比北半球低纬度地区夏季太阳辐射及亚洲季风区古气温与古降水指标记录,认为藏东南地区MIS 4冰期冰川作用可能是对北半球低纬度地区夏季太阳辐射减弱及气温下降的响应,与季风降水无关。
中图分类号:
谢金明,周尚哲,许刘兵,杨太保. 西藏东南部末次冰期早阶段冰川作用及其古气候意义[J]. 冰川冻土, 2021, 43(3): 735-746.
Jinming XIE,Shangzhe ZHOU,Liubing XU,Taibao YANG. Glacial activity during early stage of Last Glaciation in southeastern Tibet and its paleoclimate implication[J]. Journal of Glaciology and Geocryology, 2021, 43(3): 735-746.
表1
光释光测年结果"
样品编号 | 深度/m | U/10-6 | Th/10-6 | K/% | 含水量/%a | 剂量率/(Gy·ka-1) | 测片数b | OD/% | 古剂量/Gy | 年代/ka |
---|---|---|---|---|---|---|---|---|---|---|
YL01 | 6.2 | 3.64±0.40 | 23.4±2.3 | 1.46±0.20 | 10±5(2.3) | 3.77±0.22 | 48(0) | 31±3 | 212.5±9.8 | 56.4±4.2 |
YL02 | 5.0 | 3.32±0.30 | 19.7±2.0 | 1.31±0.10 | 10±5(3.0) | 3.33±0.19 | 48(1) | 11±1 | 200.6±3.2 | 60.3±3.5 |
YL03 | 5.2 | 3.74±0.40 | 20.6±2.1 | 1.73±0.20 | 10±5(2.5) | 3.88±0.22 | 48(1) | 6±1 | 255.5±2.5 | 65.9±3.9 |
YL04 | 5.2 | 3.22±0.30 | 22.4±2.2 | 1.56±0.20 | 10±5(1.9) | 3.72±0.21 | 48(13) | 9±3 | 116.0±3.9 | 31.2±2.1 |
YLT18 | 3.2 | 3.80±0.38 | 25.3±2.5 | 2.70±0.30 | 5±4(2.9) | 5.30±0.30 | 12(0) | 25±5 | 346.0±25.1 | 65.2±6.0 |
图8
青藏高原及其周边山地有测年数据的MIS 4冰川遗迹分布注:1.螺髻山[51],2.白马雪山[52],3.念青唐古拉山东段(本研究),4.喜马拉雅山中段南坡Gorkha地区[23],5.东昆仑东吉康纳湖地区[18],6.巴颜喀拉山[19],7.唐古拉山[20-21],8.念青唐古拉山西段[21],9.申扎杰岗日地区[22],10.纳木那尼峰地区[24],11.加尔瓦西北部地区[25],12.印度西北部喜马拉雅山西北段[26-27,29,41],13.阿里地区查西康[30],14.熊彩岗日地区[32],15.拉达克山脉[33],16.洪扎谷地[34],17.塔什库尔干谷地[35],18.西昆仑[31],19.东帕米尔瓦恰谷地[36],20.帕米尔(塔吉克斯坦)雅什库尔湖地区[37-39],21.喀尔里克山[42],22.博格达峰[40],23.天格尔峰[41],24.木扎尔特河谷[43],25.伊尼尔切克谷地[50],26.特斯基阿莱太山脉[45-46],27.阿拉巴什盆地[47],28.阿莱山脉科克苏谷地[44],29.吉萨尔山脉(塔吉克斯坦)[49]"
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