Quantitative model and petrology of acid magmas, genesis of ore-bearing hydrotherms
https://doi.org/10.31242/2618-9712-2020-25-1-1
Abstract
Magma models calculated for the first time show that under the deep conditions the fluid phase is absent in them as a consequence of its dissolution in the melt under high pressure. This points to the absence of fluid torrents in the regions of magma formation. Under these conditions, the content of solid phases in magmas increases sharply, which contradicts the hypothesis concerning magma formation as a result of partial melting and points to its origin as a result of friction and decompression remelt of the rocks of identical composition. These rocks originated from the fractionation of the global magma ocean at the early stage of the Earth’s evolution. Relatively low-temperature magmas at the late stage of lifting were solidified as a result of decompression release of the fluid phase in them. The high pressure of this phase, conserved due to solidification, caused disintegration of the upper parts of magmatic columns and explains the nature of volcanic explosions. With pressure rise, the fluid phase appears at later stages of magma crystallization, when the residual melts accumulate ores and volatile components carrying them. This explains the genesis of ore-bearing hydrotherms.
Supporting agencies: This article was prepared according to the plan of the research and development work of IGABM SB RAS, project No. 0381-2019-0003.
About the Author
V. S. Shkodzinskiy
Diamond and Precious Metal Geology Institute, SB RAS
Russian Federation
Russian Federation
SHKODZINSKIY Vladimir Stepanovich, dr. sci. in geology and mineralogy, leading researcher
677980, Yakutsk, Lenin ave., 39
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Review
For citations:
Shkodzinskiy V.S. Quantitative model and petrology of acid magmas, genesis of ore-bearing hydrotherms. Arctic and Subarctic Natural Resources. 2020;25(1):7-19. (In Russ.) https://doi.org/10.31242/2618-9712-2020-25-1-1
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