What caused aconcagua to form?

Aconcagua, the highest peak in South America, was formed primarily through tectonic activity associated with the collision of the Nazca and South American tectonic plates. This convergence caused significant uplift and the folding of the Earth's crust, leading to the rise of the Andes mountain range, of which Aconcagua is a part. Additionally, volcanic activity in the region contributed to its geological development, although Aconcagua itself is primarily a non-volcanic peak. Over millions of years, erosion and climatic factors further shaped its current form.