All Indian citizens holding a valid US B1/B2 visa with minimum 6 months of validity, can avail the E-visa process to obtain a Tourist visa. Please note that the E-visa process is applicable only for the TOURIST visa category.
For further details on the process and to apply for the same, please click on the link below:

PROCEDURE:- https://www.migraciones.gov.ar/ave/pdf/procedimiento_eeuu-20.pdf

Link: http://www.migraciones.gov.ar/ave/index.htm 

For any further queries related to the E-visa process, please email the Immigration Authority of Argentina at:  ave@migraciones.gov.ar as the E-visa process is entirely handled by them, without Consulate's intervention.

Fees: 400 USD