XRF XRD FT-IR AND SEM ANALYSIS THE BLACKENED TRAVERTINE RESEARCH IN HUANGLONG A WORLD NATURAL HERITAGE SICHUAN CHINA

Collected the world natural heritage Huanglong state-level scenic area has two core areas of black travertine samples, using X-ray fluorescence spectrum (XRF) spectrum, X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT IR), and scanning electron microscope (SEM) for different types of travertine samples is black surface and internal are studied. XRF analyzed the chemical composition content of travertine. Under the condition that the main elements were the same, the contents of trace elements in the surface layer and the interior of travertine were significantly different, and the surface layer of travertine showed a uniform growth trend, indicating that the trace elements migrated to the surface layer after the long-term dehydration and blackening of travertine. XRD scanning of the phase composition of travertine, perennial water loss, and intermittent water loss travertine map are stable baseline, stable peak type, less hybrid peaks, indicating that the phase composition of travertine calcite is a relatively high purity, and the longterm landscape water conservation can not obtain the phase composition of travertine calcite, compared with magnesium calcite, Magnesian) transformation. The chemical bonds and functional groups of travertine were obtained by FT-IR, and different samples showed broad consistency. CO3 2- dominated the main absorption band, and the organic groups were obvious, together with inorganic peaks of silicon, phosphorus, iron, manganese, aluminum, magnesium, and other inorganic salts. Morphology of travertine was characterized by SEM, and it was found that the structural characteristics of long-term dehydration blackened travertine calcite was more obvious.