The Los Cabos Block, at the southern end of Baja California, exposes part Late Cretaceous Peninsular Ranges Batholith over 2700 km2. In block, Batholitic Complex is exposed in two massifs, Sierra La Laguna to west and Trinidad east. sierras are separated by ~75 km long, N-S striking, San José del Cabo extensional fault system, homonymous basin. Here, we present field observations, new U–Pb Ar–A...