Abstract
This article discusses in detail chemical composition, molecular structure, microstructure phenomena, estimate of the palaeo-stress, paleo-temperature and the strain rate to deepen the knowledge for the correlation of coal deformation and metamorphism with structural environment in Xinhua Hunan by coal quality analysis, XRD and SEM methods, which provide dependable theoretical foundation for coal resource exploitation and utilization. The results show that 1) d002 value of six coal samples is from 3.36 to 3.39 nm, coal resolved itself into aphanitic graphite with the increase of coal rank during coalification, which is characterized by graphite flakes, and the crystallite size is from 50 nm to 250 nm; A certain degree of 3R-structure content is increases and the crystallite size is extend with the coalification process, but RH-structure content is decreased; 2) the tectonic environment of research area belongs to the ductile-brittle deformation, which was characterized by low temperature, low stress, high strain rate; 3) Tianlongshan magmatic intrusion provided heat source, its side-extrusion made the molecules structure of coal ordering, distance between layers decreased, finally it caused the formation of aphanitic graphite.
Highlights
Coal is a kind of special rock that is sensitive to temperature and pressure, which will inevitably leave various stress marks in the long geological history
The test samples included coal samples and rock samples examined in this study to give further details of the reasons for coal deformation and metamorphism
The morphological characteristics of coal were found to be related to the deformation and metamorphism mechanism of the coal body structure
Summary
Coal is a kind of special rock that is sensitive to temperature and pressure, which will inevitably leave various stress marks in the long geological history. Coalification research achievements in foreland basin and thrust nappe tectonic belt of tectonic activity area, reveals the structure—hot events of coal deformation and metamorphism, process control, significantly in coal composition, texture and structure elements of change and migration and accumulation and dispersion [1] [2] [3] [4] [5]. This article uses the coal quality analysis and the experimental test methods such as XRD, SEM, by micro structure analysis, the stress value calculation and research of temperature and strain rate, to reveal the coal deformation metamorphic characteristics relation with tectonic environment, provide the basis for development and utilization of coal resources
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