Identification of the Ore-Forming Anomaly Component by MSVD Combined with PCA from Element Concentrations in Fracture Zones of the Laochang Ore Field,Gejiu,SW China  

作　　者：Jiangnan Zhao Shouyu Chen 

机构地区：[1]School of Earth Resources,China University of Geosciences,Wuhan 430074,China [2]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430078,China

出　　处：《Journal of Earth Science》2021年第2期427-438,共12页地球科学学刊（英文版）

基　　金：jointly supported by the National Key R&D Program of China(Nos.2016YFC0600509,2017YFC0601504)。

摘　　要：Fault and fractures are well-developed in the Gejiu tin-polymetallic district,and they are closely related to the formation and distribution of ores.In this paper,the principal component analysis(PCA)and multifractal singular value decomposition(MSVD)methodologies were applied for identification of the ore-forming anomaly components from element concentrations of fault rocks in the Laochang ore field,Gejiu.The results show that:(1)the wall rocks and fault rocks have anomalous concentrations of ore-forming elements,indicating that these elements are mainly derived from fluid/rock interaction in the fracture zones;(2)PCA based on clr-transformed data was used to recognize significant association anomalies of ore-forming elements,which lay a foundation for further extracting ore-forming anomaly components from the element association anomalies related to Sn-Cu mineralization;(3)MSVD could effectively explore local anomaly features and decompose ore-forming element association anomalies associated with buried mineralization in more detail.The ore-forming element anomaly components can delineate ore-finding Sn-Cu polymetallic deposits more exactly than the ore-forming element association anomalies.

关 键 词：singular value decomposition(SVD) principal component analysis(PCA) ore-forming element anomaly components Sn-Cu polymetallic ore-finding targets Gejiu Sn-Cu ore field SW China 

分 类 号：P632[天文地球—地质矿产勘探]