Pervasive autocorrelation of the chemical index of alteration in sedimentary profiles and its palaeoenvironmental implications

ISL OpenIR > 青海盐湖研究所知识仓储

	Pervasive autocorrelation of the chemical index of alteration in sedimentary profiles and its palaeoenvironmental implications
	Xiao, Shangbin 1,2; Liu, Weiguo 1; Li, Anchun 3; Yang, Shouye 4; Lai, Zhongping2
	2010-02-01
发表期刊	SEDIMENTOLOGY
卷号	57 期号:2 页码:670-676
关键词	Autocorrelation Chemical Index Of Alteration Palaeoclimate Change Post-sedimentation Sedimentary Profiles
摘要	The chemical index of alteration has been used widely for reconstruction of the palaeoclimate. However, the mechanisms and environmental factors controlling the chemical index of alteration of sediments are not yet fully understood. In this study, autocorrelations of the chemical index of alteration in nine sedimentary profiles, from both the land and the sea, spanning different geological times, are discussed. The sediments of these profiles have different origins (dust, fluvial or ocean sediments) and are from various climate situations and sedimentary environments. Autocorrelations of chemical index of alteration series are ubiquitously evident in all profiles. It is suggested here that autocorrelations may be caused by post-depositional changes such as persistent weathering and diagenesis. As a result, the chemical index of alteration may not reflect climatic conditions during the time of sediment deposition. This study strongly recommends the confirmation of the reliability and veracity of the chemical index of alteration before it is adopted to evaluate the weathering degree of parent rocks and to reconstruct the past climate. Significant autocorrelations in loess profiles were specifically observed, suggesting that the existing understanding of loess deposition in terms of climate conditions requires re-examination, and that previous reconstructions of rapid climate changes (for example, in centennial-millennial scales) should be treated with caution.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5963
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室
作者单位	1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710075, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Tongji Univ, Dept Marine Geol, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Shangbin,Liu, Weiguo,Li, Anchun,et al. Pervasive autocorrelation of the chemical index of alteration in sedimentary profiles and its palaeoenvironmental implications[J]. SEDIMENTOLOGY,2010,57(2):670-676.
APA	Xiao, Shangbin,Liu, Weiguo,Li, Anchun,Yang, Shouye,&Lai, Zhongping.(2010).Pervasive autocorrelation of the chemical index of alteration in sedimentary profiles and its palaeoenvironmental implications.SEDIMENTOLOGY,57(2),670-676.
MLA	Xiao, Shangbin,et al."Pervasive autocorrelation of the chemical index of alteration in sedimentary profiles and its palaeoenvironmental implications".SEDIMENTOLOGY 57.2(2010):670-676.