Global Geology 2011, 14(2) 94-101 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
factor analysis
chert
diagenetic information
southern Tibet
Authors
HE Junguo1
ZHOU Yongzhang1
FU Wei2
LI Hongzhong1
PubMed
Article by HE Junguo1
Article by ZHOU Yongzhang1
Article by FU Wei2
Article by LI Hongzhong1

Multivariant statistical analysis for diagenetic information of chert from southern Tibet��China

HE Junguo1, ZHOU Yongzhang1, FU Wei2, LI Hongzhong1

1�� Department of Earth Sciences /Key Laboratory of Guangdong Geological Processes and Mineral Resources Exploration�� Zhongshan University��Guangzhou 510275��China; 2�� Department of Resources and Environmental Engineering��Guilin University of Technology��Guilin 541000��Guangxi��China

Abstract��

There are large scale chert formations of different ages exposed widely in southern Tibet��along Yarlung-Zangbo suture zone�� The typical chert specimens were sampled from Pengcuolin��Xialu and Zongzhuo profiles�� Multivariate statistical analysis is applied for effectively extracting the geochemical information of the chert��and the raw data are processed by R-factor analysis�� The first��second and third factors representing terrigenous�� authigenic and hydrothermal constituents are extracted from the analysis results�� From Pengcuolin�� Xialu to Zongzhuo chert profiles��the variance ratios of continental and authigenetic factors become higher ( 51. 1%→62. 9%→91. 6%) ��while hydrothermal factor rapidly decrease( 40. 9%→32. 2%→0) �� This tendency also present in the analysis for trace elements��indicating that Pengcuolin chert is hydrothermal origin��The Zongzhuo chert belong to normal sedimentation and the Xialu chert exhibit normal deposition interacted with hydrothermal sedimentation�� The facts provide significant implications for understanding the diagenetic and palaeomineralization information of southern Tibet��

Keywords�� factor analysis   chert   diagenetic information   southern Tibet  
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