汉江一级阶地抬升以来北亚热带风尘堆积、发育与东亚季风演变的耦合关系——以郧县段汉江上游谷地为例

doi:10.7522/j.issn.1000-694X.2013.00370

摘要/Abstract

摘要： 风成黄土对东亚冬夏季风优势期转换及起迄时间起到良好指示作用，探究风尘黄土堆积、发育特征与东亚季风演变的耦合关系十分必要。本文通过研究汉江一级阶地上覆黄土-古土壤序列的构型、磁化率、烧失量、粒度、元素组成特征，分析汉江一级阶地抬升以来黄土-古土壤序列的成因及成壤特征，探究东亚冬夏季风的演化序列。结果表明：（1）汉江上游地区黄土-古土壤序列的地层构型为表层土（MS）-近代黄土（L₀）-古土壤（S₀）-过渡层（L_t）-马兰黄土（L₁），磁化率、粒度、烧失量、元素组成等特征指示各地层成壤强度特征为S₀>L₀/L_t>L₁。（2）成壤强度指示18000 a BP以来，东亚冬夏季风演替特征为末次盛冰期冬季风强烈→全新世早期冬季风减弱→全新世中期夏季风主导→全新世晚期夏季风减弱~，冬季风强盛，其演变滞后于低纬太阳辐射变化2000~3000 a。（3）该风尘堆积物理化性质对6000~5000a BP的气候恶化期有所响应。总而言之，汉江上游一级阶地上覆黄土为风尘堆积物，指示18000a BP以来东亚季风的变迁规律及季风异常事件，能够体现北亚热带对全球气候变化及极端事件的响应。

关键词: 北亚热带, 黄土-古土壤, 季风演变, 耦合

Abstract: As the accumulation of dust storm, aeolian loess indicates the conversion of East Asian Summer Monsoon, which is necessary to explore the coupling relationship of the loess accumulation & pathogenesis characteristics and East Asian Monsoon variability. Pedogenic modification characteristics and the structure of soil profiles were observed in the field survey process in the Hanjiang River valley, and magnetic susceptibility,particle-size distribution, mineral assemblage, major elements trace and OSL age were analyzed in laboratory. The research tries to use loess-like as ancient inductor to induct the transformation of East Asian Monsoon. (1)The loess sediments profile structure is MS-L₀-S₀-L_t-L₁-AD in the Hanjiang River valley. The pathogenesis strength's sequence shows S₀>L₀/L_t>L₁, the elements features (Al, Fe, Na, K, Si) are consistent with the Loess Plateau. (2)East Asian Monsoon and solar radiation exists a phase difference of 2000-3000.The East Asian Monsoon succession characteristic in northern subtropics was as following: strong winter wind(Last Glacial Maximum)→weak winter monsoon (early Holocene)→dominant summer monsoon (Mid-Holocene) →weak summer monsoon (the late Holocene) (3)Hanjiang River valley loess recorded cold and dry events happened during 5000-6000 a BP.

Key words: northern subtropics, loess-paleosol, monsoon variability, coupling relationship

中图分类号:

P531

卞鸿雁, 庞奖励, 黄春长, 查小春, 孔伟. 汉江一级阶地抬升以来北亚热带风尘堆积、发育与东亚季风演变的耦合关系——以郧县段汉江上游谷地为例[J]. 中国沙漠, 2014, 34(3): 674-682.

Bian Hongyan, Pang Jiangli, Huang Chunchang, Zha Xiaochun, Kong Wei. The Coupling Relationship of Pathogenesis and East Asian Monsoon Variability since 18000 a BP in the Upper Reaches of Hanjiang River Valley of China[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(3): 674-682.

参考文献

[1] 雷祥义.秦岭黄土-古土壤发育时的植被与环境[J].海洋地质与第四纪地质,2000,20(1):73-79.
[2] 鹿化煜,张红艳,王社江,等.东秦岭南洛河上游黄土地层年代的初步研究及其在旧石器考古中的意义[J].第四纪研究,2007,27(4):559-567.
[3] 沈玉昌.汉水河谷的地貌及其发育历史[J].地理学报,1956,22(4):295-321.
[4] 朱震达.汉江上游丹江口至白河间的河谷地貌[J].地理学报,1955,21(3):259-270.
[5] 庞奖励,黄春长,周亚丽,等.汉江上游谷地全新世风成黄土及其成壤改造特征[J].地理学报,2011,66(11):1562-1573.
[6] 王恒松,黄春长,周亚利,等.关中西部千河流域全新世古洪水事件光释光测年研究[J].中国科学,2012,42(3):390-401.
[7] 张小曳,张光宇,朱光华,等.中国源区粉尘的元素示踪[J].中国科学:D辑,1996,39(5):512-521.
[8] 乔晶,庞奖励,黄春长.汉江上游郧县段全新世古洪水滞流沉积物特征[J].地理科学进展,2011,31(11):1467-1474.
[9] 杨建超,庞奖励,黄春长,等.汉江上游郧县辽瓦店剖面粒度组成特征及其意义[J].中国沙漠,2013,33(3):682-687.
[10] 张虎才,张林源.兰州九州台黄土剖面元素地球化学研究[J].地球化学,1991,(1):79-86.
[11] 王丽娟,庞奖励,黄春长.甜水沟全新世黄土-古土壤序列风化程度及意义[J].地理科学进展,2011,30(3):379-384.
[12] 丁敏,庞奖励,黄春长.关中东部全新世黄土古土壤序列常量元素地球化学特性研究[J].中国沙漠,2011,31(4):862-867.
[13] 刘安娜,渭河流域全新世剖面元素地球化学特征与成壤环境变化研究[D].西安:陕西师范大学,2006.
[14] An Z S,Porter S C,Kutzbach J E,et al.Asynchronous Holocene optimum of the East Asian monsoon[J].Quaternary Science Reviews,2000,19:743-762.
[15] 许晨曦,郝青振,杨石岭,等.黄土高原东南部黄土记录的全新世东亚季风变化[J].地质力学学报,2011,17(2):175-185.
[16] 丁仲礼,刘东生.晚更新世东亚古季风变化动力机制的概念模型[J].科学通报,1998,43(2):122-132.
[17] Herzschuh U.Palaeo-moisture evolution in monsoonal Central Asia during the last 50,000 years[J].Quaternary Science Reviews,2006,25(1/2):163-178.
[18] 孙建中,李虎侯.马兰黄土沉积速率及其地质意义[J].沉积学报,1989,7(1):109-115.
[19] 张肖剑,靳立亚,俞飞.等.基于PMIP2气候模式模拟的中全新世北大西洋涛动[J].海洋学报,2010,32(4):41-51.
[20] 侯光良,方修琦.中国全新世气温变化特征[J].地理科学进展,2010,30(9):1075-1079.
[21] Cui H T,Song C.Quaternary periglacial environment in China[M]//Liu T S.Quaternary Geology and Environment in China.Beijing:Science Press,1991:79-85.
[22] Denton G H,Karlen W.Holocene climatic variations-Their pattern and possible causes[J].Quaternary Research,1973,3(2):155-205.
[23] 庞奖励,黄春长,陈宝群.黄土高原南部全新世土壤微结构形成机理探讨[J].地理研究,2002,21(4):487-494.