干旱区生态环境知识资源中心(Arid): 西藏洞错全新世早中期盐湖沉积的古气候记录

Arid

	西藏洞错全新世早中期盐湖沉积的古气候记录
其他题名	Early-middle holocene palaeoclimate record from saline lake sediments in Tontso, Tibet
	魏乐军 1; 郑绵平 1; 蔡克勤 2; 葛文胜 2
来源期刊	地学前缘
ISSN	1005-2321
出版年	2002
卷号	9 期号:1 页码:129-135
中文摘要	通过调查藏北高原腹地盐湖洞错的I阶地湖相化学沉积，发现硼砂及赋存5层纯芒硝的完整沉积剖面。依据DZ01剖面的磁化率特征，结合韵律层的沉积学、盐类矿物学和~(14)C年代学，盐湖沉积物磁化率等恢复重建盐湖环境的替代性指标。指出洞错在全新世早、中期经历了潮湿温暖期（8 470 aBP，可能至10 500 aBP）寒冷干旱期（8 470～8 170 aBP）潮湿温暖期（8 170～7 590 aBP）气候频繁波动期（7 590～7 400 aBP，寒冷大背景下三干三湿的气候演替）寒冷干旱期（7 400～6 940 aBP）潮湿温和期（6 940～6 620 aBP）寒冷干旱期（6 620～6 410 aBP）湿暖湿润时期（6 410 aBP以后，可能至3 300 aBP）的演变过程。
英文摘要	A saline lake-Tontso located in the center of Northern Tibetan Plateau was chosen as our study object. There is a very harsh nature environment in Tontso and is no human pollution there. Modern chemical sediments is depositing on the upper-bottom at present. During fieldwork, borax in mirabilite beds from Tontso first stage section was discovered for the first time, and sedimentary sections with whole five pure layers of mirabilite were also found. The discoveries are of important significance for appraisement of resources and ore-finding research in Tontso area, as well as for palaeoclimate and palaeo-environment study. Based on the characteristics of magnetic susceptibility of the Tontso section DZ01, combined with the study on sedimentology, saline mineralogy and ~(14)C chronology, applied to comparative salinology of saline sedimentary environment, it is confirmed that mirabilite-as a kind of cold saline mineral-is a delicate and effective indicator; and that the saline sedimentary magnetic susceptibility is a reliable substitute for reconstruction of the palaeoclimate and palaeoenvironment. High discriminable analysis and study that based on the credible age scale sensitively rebuilt the Tontso’s palaeoclimate and palaeoenvironment according to saline chemical sediments. It is pointed out that Tontso frequently underwent a series of dry/wet and cold/warm climate changes during early-middle Holocene (>8 470～6 410 aBP) as follows: before 8 470 aBP, probable to 10 500 aBP: the stage of generally warm & wet; during 8 470～8 170 aBP: the stage of frigid & arid (lasting 300a); during 8 170～7 590 aBP: the stage of warm & wet (lasting 580a); during 7 590～7 400 aBP: the stage of frequently fluctuating (lasting 190a), under frigid background, it went through a climate fluctuating of three arid and three wet alternation; during 7 400～6 940 aBP: the stage of frigid & arid (lasting 460a); during 6 940～6 620 aBP: the stage of warm & slightly wet (lasting 320a); during 6 620～6 410 aBP: the stage of frigid & arid (lasting 210a); after 6 410 aBP: the stage of generally warm & wet (There is an interval on the top of sections from then on. The duration of the stage cannot be inferred).
中文关键词	西藏洞错 ; 磁化率 ; 全新世 ; 古气候 ; 盐湖
英文关键词	Tibetan Tontso magnetic susceptibility Holocene palaeoclimate saline lake
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:972706
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203108
作者单位	1.中国地质科学院, 盐湖资源与环境开放研究实验室, 北京 100037, 中国; 2.中国地质大学(北京), 北京 100083, 中国
推荐引用方式 GB/T 7714	魏乐军,郑绵平,蔡克勤,等. 西藏洞错全新世早中期盐湖沉积的古气候记录[J],2002,9(1):129-135.
APA	魏乐军,郑绵平,蔡克勤,&葛文胜.(2002).西藏洞错全新世早中期盐湖沉积的古气候记录.地学前缘,9(1),129-135.
MLA	魏乐军,et al."西藏洞错全新世早中期盐湖沉积的古气候记录".地学前缘 9.1(2002):129-135.