Analysis of environmental instability using geomorphological indices (case study: alluvial fans Aleh Igneous mass in Qom)

Geomorphological forms each at different stages of the process of environmental change and evolution, stable conditions and instabilities under the influence of external and internal processes. One of these forms is igneous masses, which take on a distinct shape and change due to tectonic movements and fault movements. This change can be shown using geomorphological evidence and indicators. The igneous massif is located beyond the Sanandaj-Sirjan metamorphic belt in the western part of Qom province. By examining different patterns such as drainage patterns, color tone, slope, circular rings, and geomorphological indices, mass growth was revealed in this area. The pattern index completely indicates the instability of this mass. Most of the surfaces of the alley mass slopes are composed of triangular shapes, the formation of which is the result of the performance of active internal processes against external processes. The color tone of this cone is light and indicates that it is active. The circular rings of the mass indicate the expansion of the eastern slopes. The slope of this mass is between 5-10.5 which is justified by tectonic action and all the alluvial fans of the surface morphology are in the form of ducts and small ridges 2 cases of erosion were observed in the southeastern part of the intrusive mass, which is advancing towards the top of the alluvial fan. Captivity and diversion of waterways in the region is another piece of evidence that is influenced by active tectonics. Due to the instability of the slopes and alluvial fans, no human activity (except in special cases) has been formed in the area. In general, the indicators and evidence of instability and active tectonic movements in different parts of the intrusive rock of diorite and the lack of news of the day. Due to the active tectonics and instability of this environment is fully approved.