I am the currency of a country that is home to the world's largest salt flat, a wine region famed for Malbec, and a mountain range that includes Aconcagua, the highest peak in both the Western and Southern Hemispheres.

1. I am not pegged to any other currency.
2. My name is derived from a word that means 'weight' or 'value'.
3. Historically, I was linked to a silver standard.
4. My symbol is often confused with the US dollar, but my name is different.