Comprehensive quantification method of rock biotite formation condition

Abstract

The invention discloses a comprehensive quantification method of rock biotite formation conditions. The comprehensive quantification method comprises the following steps of: S1, collecting samples with different lithology in a rock mass, grinding the samples into polished slices, observing the polished slices by means of a microscope, determining the mineral composition and content of the rock, and preliminarily dividing the variety, geological occurrence and mineralization characteristics of biotite; S2, testing mineral components of the biotite, and calculating a number of cations and related parameters; S3, determining species, properties and forming environment of the biotite, and deducing a mother magma source; S4, and calculating physicochemical conditions of biotite formation, inverting physicochemical conditions (temperature, pressure, depth and oxygen escape degree), geochemical kinetics mechanism and other characteristics of magma in the biotite formation stage, and exploringthe relationship between the physicochemical conditions and diagenetic mineralization. According to the comprehensive quantification method, the physicochemical conditions and diagenetic mineralization properties of biotite formation are simply and rapidly determined, the environment of mother magma, the physiological conditions of magma evolution and the diagenetic mineralization relation of themother magma and the magma evolution can be deduced, and a basis is provided for mineral exploration.

Description

technical field [0001] The invention relates to the technical field of geological engineering, in particular to a comprehensive quantification method for rock biotification formation conditions. Background technique [0002] Magma activity is not only a complex physical and chemical process, but also a complex dynamic process, which requires the introduction of fluid dynamics, heat transfer, chemical kinetic principles and transport theory into the study of magmatic processes. Regarding the estimation of magma crystallization conditions, mineralogists and petrologists have carried out a large number of thermobarometer experience, experimental calibration work and mineral phase balance experiments, which provide a good basis for quantitative estimation of magma crystallization conditions. There are mainly stable isotope geological thermobarometers, which are limited to the functional relationship between the stable isotope fractionation value and temperature between equilibri...

AI Technical Summary

Problems solved by technology

For example, the geothermometer of biotite-garnet has restrictions on paragenetic minerals and mineral components, and has a wide range of applications (575-950°C); orthopyroxene-biotite geothermometer can be applied to amphibolite facies- In the metamorphic rocks of granulite facies, the temperature error is ±50°C, but for the retrograde metamorphic origin of biotite, the recombination of biotite components at low temperature, and the high F content in biotite will cause larger temperature errors; Muscovite-biotite geological thermobarometer, but limited to the composition of mica minerals, the temperature and pressure range of mineral crystallization (450-700℃, 200-960MPa)

[0004] However, the above research has great limitations, and cannot fully reflect the comprehensive physical and chemical conditions and formation environment of biotite formation, which is not conducive to people's understanding of the environment of the parent magma, the physical and chemical conditions of magma evolution, and its rock-forming and mineralization relations.

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