Magmatogene geology-genetic conceptions of the hydrothermal gold deposits formation: facts and arguments

There is a necessity of replacement of granitogene, basaltogene, metamorphogene, polygene hypotheses of the hydrothermal gold deposits formation founded in the twentieth century by the theory and working up on its base of the mineralization effective prognosis-search criteria complex. The prerequisite for the beginning of this operation is the aggregate of the mutually supplementing established facts revealed mainly in the deposits of the Siberian craton southern fold-mountain framing formed in the age diapason from Late Riphean to Late Paleozoic in crystalline and black-shale substratum. It is advisable to appraise the adequacy of the referred facts with argument systems of every hypothesis and to discuss possibilities to intensify their validity by introducing new data. So far as the latter show the connection of ore formation with magmatism, the evidence of the magmatogene granitogene and basaltogene hypotheses is analysed in the comparative aspect in the first place. The preconditions are given that defined the methodology and methods of the investigations directed at reconstruction of the thermodynamic and physic-chemical regimes of granitoid melts functioning and conditions of its gold-generating capacity realization. The limitations are discussed following from methodology and methods of the scientific research and appearing as a consequence of new data attraction, negatively influencing the trustworthiness of the deductions about granitoid melts ability to generate metalliferous fluids in volumes sufficient for creation of industrial gold deposits. According to an alternative scenario the system of proofs of gold deposits formation at the late basaltoid stage of antidromic fluid-ore-magmatic complexes includes the following facts: 1) the temporal interval of the complexes formation does not exceed 50 million years; 2) all deposit environments have authentic thermodynamic and physic-chemical regimes of ore-mineral complexes formation; 3) instillation of moderate alkaline basaltic melts repeatedly alters with metalliferous fluids; 4) the instillation of metalliferous fluids occur in melts they formed of hot intra-ore dolerite dikes-fluid bearers; it is estimated as one of the indications of the sources unity of moderate alkaline basaltic magma chambers; 5) femic K, P, Ti, Mg, Fe, Ca, Mn specialization of basaltic melts and auric fluids proves a deduction about the unity of their sources; 6) the inheritance by ore beresites and ores of K-S-carbon dioxide into-dike apodolerite metasomatism type and contrasting femic elements anomalies formed in apodolerite metasomatites proves into-dike apodolerite, by-ore metasomatism and ore formation as a consequence of the functioning of the same metalliferous fluids generated in basaltic chambers.

Keywords

Authors

References