气候变化领域集成服务门户(CCPortal): Spatial Overlay Analysis of Geochemical Singularity Index α-Value of Porphyry Cu Deposit in Gangdese Metallogenic Belt, Tibet, Western China

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DOI	10.3390/app131810123
	Spatial Overlay Analysis of Geochemical Singularity Index α-Value of Porphyry Cu Deposit in Gangdese Metallogenic Belt, Tibet, Western China
	Zheng, Shunli; Jiang, Xiaojia; Gao, Shunbao
发表日期	2023
EISSN	2076-3417
卷号	13 期号:18
英文摘要	The statistical modeling with ILR-RPCA-back CLR has two problems when dealing with the closure effect of geochemical data. Firstly, after performing isometric logratio (ilr) transformation, robust principal component analysis (RPCA) is employed for processing. The double-plot diagram illustrates that the element sequence transformation occurs in the first and second principal components, while the unique principal component remains unattainable. Secondly, by transforming both the score and load into the centered logratio (CLR) space using the U matrix, it is possible to obtain a score result that corresponds to the original order of elements according to the CLR = ILR center dot U formula. However, for obtaining a load result that corresponds to the original order of elements, an alternative formula CLR = UT center dot ILR must be used instead. In order to determine the optimal element assemblage for porphyry copper deposits, this study conducted statistical analysis on mineral assemblages from discovered deposits in the Gangdese metallogenic belt and identified Cu, Mo, Au, Ag, W, and Bi as key elements associated with porphyry copper deposits. Subsequently, by analyzing the singularities of the composite elements, the spatial overlay of the combined element is carried out, and concentration-area (C-A) fractal filtering is applied to identify the anomaly and background areas. To facilitate comparison, we conducted an analysis of various mineral and ore deposit types, revealing the following findings: (1) Combination elements exhibit superior recognition capability than single elements in porphyry copper deposits; (2) Skarn-type copper deposits unrelated to porphyry show a high degree of dissimilarity compared to those related to porphyry; (3) this method offers advantages over the single element method in evaluating porphyry gold deposits by reducing anomaly levels and initial investment during the evaluation stage for porphyry copper anomalies; (4) However, this method has limited ability in distinguishing between porphyry copper and molybdenum deposits.
关键词	geochemical singularity index spatial overlay analysis Gangdese metallogenic belt porphyry Cu deposit
英文关键词	UNDISCOVERED MINERAL-DEPOSITS; ANOMALIES; PROVINCE
WOS研究方向	Chemistry, Multidisciplinary ; Engineering, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS记录号	WOS:001145102700001
来源期刊	APPLIED SCIENCES-BASEL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283516
作者单位	China University of Geosciences - Wuhan; China University of Geosciences - Wuhan; China University of Geosciences - Wuhan
推荐引用方式 GB/T 7714	Zheng, Shunli,Jiang, Xiaojia,Gao, Shunbao. Spatial Overlay Analysis of Geochemical Singularity Index α-Value of Porphyry Cu Deposit in Gangdese Metallogenic Belt, Tibet, Western China[J],2023,13(18).
APA	Zheng, Shunli,Jiang, Xiaojia,&Gao, Shunbao.(2023).Spatial Overlay Analysis of Geochemical Singularity Index α-Value of Porphyry Cu Deposit in Gangdese Metallogenic Belt, Tibet, Western China.APPLIED SCIENCES-BASEL,13(18).
MLA	Zheng, Shunli,et al."Spatial Overlay Analysis of Geochemical Singularity Index α-Value of Porphyry Cu Deposit in Gangdese Metallogenic Belt, Tibet, Western China".APPLIED SCIENCES-BASEL 13.18(2023).