Vicuña Mackenna Batholith

Vicuña Mackenna Batholith
Stratigraphic range: Early Jurassic-Late Cretaceous ~192–98 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Batholith
Lithology
Primary	Gabbro, granitoids
Location
Coordinates	24°21′57″S 69°02′24″W / 24.36583°S 69.04000°W / -24.36583; -69.04000
Region	Antofagasta Region
Country	Chile
Type section
Named for	Sierra Vicuña Mackenna

The Vicuña Mackenna Batholith (Spanish: Batolito Vicuña Mackenna) is a group of plutons in the Chilean Coast Range of northern Chile. The plutons of the batholith formed (cooled from magma to rock) between the Early Jurassic and the Late Cretaceous (192–98 Ma). The magmas that formed the batholith originated in Earth's mantle and have not suffered any significant crustal contamination. A group of Early Cretaceous plutons were intruded syn-tectonically on the Atacama Fault.^[1]

Subdivision

Geologists Miguel Hervé and Nicolás Marinivic identify six major units. From the oldest to the youngest these are:^[1]

Barazate Unit (192-181 Ma)
Paranal Unit (ca. 170 Ma). This unit has the largest areal extent. It is composed of gabbronorite, gabbro, diorite, monzodiorite, monzogabbro and monzogabbronorite.
Ventarrones Unit (149-138 Ma)
Remiendos Unit (133-128 Ma)
Herradura Unit (108-98 Ma)

^ ^a ^b Hervé, Miguel; Marinovic, Nicolas (1989). "Geocronología y evolución del batolito Vicuña Mackenna, Cordillera de la Costa, sur de Antofagasta (24-25°S)". Revista Geológica de Chile (in Spanish). 16 (1): 31–49. Retrieved 8 August 2016.

Terranes

Sedimentary
formations
and groups

Cretaceous	Baños del Flaco Fm. Cerro Colorado Fm. Chacarilla Fm. Chañarcillo Gp. Coihaique Gp. Divisadero Gp. Dorotea Fm. Hornitos Fm. La Liga Fm. Ñirehuao Fm. Punta del Cobre Fm. Purilactis Gp. Quiriquina Fm. Viñita Fm. Way Gp. Zapata Fm.
Jurassic	Chacarilla Fm. Coihaique Gp. Ibáñez Fm. La Liga Fm. La Negra Fm. Nacientes del Biobío Fm. Nacientes del Teno Fm. Pan de Azúcar Fm. Tobífera Fm.
Triassic	Canto del Agua Fm. Choiyoi Gp. Panguipulli Fm. Santa Juana Fm. Tralcán Fm.