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Discrimination geochemical interaction effects on mineralization at the polymetallic Glojeh deposit,NW Iran by interative backward quadratic modeling

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Acta Geochimica 2020年第2期39卷 236-254页

作者： Farshad Darabi-Golestan Ardeshir Hezarkhani Department of Mining and Metallurgical Engineering Amirkabir University of Technology424 Hafez AveTehran 15875-4413Iran

The physico-chemical exchanges between hydrothermal fluids and the host rock are usually controlled by elemental interaction effects.A criterion-based backward elimination approach applies the iterative regression analysis and analysis of variance to investigate the geochemical features of the polymetallic Glojeh(Au-Ag-CuPb-Zn)deposit in NW Iran.A statistical definition of the elemental interaction effects(X(i-j)^2,Xi×Xj)could elucidate the relationship between variables and the performance of a full quadratic polynomial model(QPM).The model optimization procedure was carried out by the removal of insignificant predictors(P value 95%CL)based on R^2(pred.)*** order to straighten the convergent trend with R^2 and R^2(adj.),R^2(pred.)gradually increased from 0%to 77.8%by 15-steps *** miniature-scale geochemical changes indicate double ordinal Au(Ag,Pb)and Au(Ag,Zn)interactions within the vein and host rock,in *** show that the Au(Pb-Zn)commonly presents ordinal effect at the vein and disordinal interaction at the host *** ordinal-disordinal interaction revealed that elements Pb and Zn have similar geochemical features during *** addition,Akima's polynomial contour map confirms the results from Pb-Zn interaction effects by dependency tracing between Au-Pb-Zn at different ***,it is noteworthy that Pb and Zn occur together in the second phase of Pb-Zn-Cu±(Ag±Cd)sulfide mineralization at Glojeh,which implies intergrowth and interaction of Pb-Zn on Au *** and Zn demonstrate relatively high mobility and are generally concentrated in the near surface *** is an immobile element during alteration and high content Hg zone is mainly restricted to narrow stripes above ore vein and veinlets.

关键词： Backward Elimination Quadratic polynomial model miniature-scale changes Ordinal–disordinal interaction effect Akima's polynomial contour map Immobile element

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