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Abstract <p>Economical mineralization of the Bystrinsky Cu–Au–Fe-porphyry–skarn and Shakhtama Mо-рorрhyry deposits is confined to multiphase granitoid plutons of the Middle–Late Jurassic Shakhtama complex. The composition of biotite from magmatic rocks of ore-bearing and barren intrusions has been studied to identify the specifics of Cu–Au porphyry and Mo porphyry mineralization. The magmatic origin of the studied biotite and the absence of secondary processes have been demonstrated. Biotite from ore-bearing intrusions of the Bystrinsky and Shakhtama deposits is characterized by high MgO content (&gt;15 wt %). Low values of IV(F) and IV(F/Cl) calculated from biotites of ore-bearing intrusions indicate enrichment of F and Cl in the fluid phase. It has been determined that the rocks of the ore stocks were formed from oxidized magmas. New data showed that published diagrams for biotite composition are incorrect for separating ore-bearing and barren rocks. Linear discriminant analysis was performed on the obtained biotite compositions of the Bystrinsky and Shakhtama deposits, and new a discriminatory diagram of the author was proposed. Unlike published diagrams, new discriminant diagram allows to be distinguished potentially ore-bearing intrusive complexes (and their type of mineralization) from barren intrusive complexes by biotite composition and can be used with other indicator minerals in the search for porphyry mineralization.</p>

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The Estimation of Prospectivity of Porphyry Cu–Mo–Au Mineralization Based on Biotite Composition (on Example of the Shakhtama Мо-Роrрhуrу and Bystrinsky Сu–Аu–Fе-Porphyry–Skarn Deposits, Eastern Transbaikalia, Russia)

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • V. S. Vesnin,
  • P. A. Nevolko,
  • T. V. Svetlitskaya,
  • M. O. Shapovalova

摘要

Abstract

Economical mineralization of the Bystrinsky Cu–Au–Fe-porphyry–skarn and Shakhtama Mо-рorрhyry deposits is confined to multiphase granitoid plutons of the Middle–Late Jurassic Shakhtama complex. The composition of biotite from magmatic rocks of ore-bearing and barren intrusions has been studied to identify the specifics of Cu–Au porphyry and Mo porphyry mineralization. The magmatic origin of the studied biotite and the absence of secondary processes have been demonstrated. Biotite from ore-bearing intrusions of the Bystrinsky and Shakhtama deposits is characterized by high MgO content (>15 wt %). Low values of IV(F) and IV(F/Cl) calculated from biotites of ore-bearing intrusions indicate enrichment of F and Cl in the fluid phase. It has been determined that the rocks of the ore stocks were formed from oxidized magmas. New data showed that published diagrams for biotite composition are incorrect for separating ore-bearing and barren rocks. Linear discriminant analysis was performed on the obtained biotite compositions of the Bystrinsky and Shakhtama deposits, and new a discriminatory diagram of the author was proposed. Unlike published diagrams, new discriminant diagram allows to be distinguished potentially ore-bearing intrusive complexes (and their type of mineralization) from barren intrusive complexes by biotite composition and can be used with other indicator minerals in the search for porphyry mineralization.