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Pervasive autocorrelation of the chemical index of alteration in sedimentary profiles and its palaeoenvironmental implications
Xiao, Shangbin1,2; Liu, Weiguo1; Li, Anchun3; Yang, Shouye4; Lai, Zhongping2
2010-02-01
Source PublicationSEDIMENTOLOGY
Volume57Issue:2Pages:670-676
SubtypeArticle
AbstractThe 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.
KeywordAutocorrelation Chemical Index Of Alteration Palaeoclimate Change Post-sedimentation Sedimentary Profiles
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordCHINESE LOESS ; PALEOCLIMATIC IMPLICATIONS ; GEOCHEMICAL COMPOSITION ; PROVENANCE ; ANTARCTICA ; QUATERNARY ; DIAGENESIS ; CLIMATE ; RECORD ; SEA
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000273669500016
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5963
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Affiliation1.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
Recommended Citation
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.
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