San Quintin Volcanic Field

sopka (bez známé erupce za posledních ~12 000 let), Mexico, Eastern Pacific Volcanic Regions

Kde

Mexico, Eastern Pacific Volcanic Regions

Typ (GVP)

Pyroclastic cone(s)

Nadmořská výška

260 m

Poloha

30,467°, -116,012°

San Quintín Volcanic Field on the NW coast of Baja California consists of 11 late-Pleistocene pyroclastic cones and related lava flows. Low lava shields, initially submarine, are capped by scoria cones. San Quintín rocks are similar to intraplate or oceanic island alkalic rocks and differ from other Baja alkalic volcanic suites. It is the only Quaternary volcanic field in Baja California where lower-crustal and upper-mantle xenoliths are found. The field is located at the margins of the Y-shaped San Quintín Bay, and includes a northern and southern group of cones, Monte Mazo (connected to the mainland by a long tombolo), and Isla San Martín (5 km offshore to the west). Lava flows overlie midden deposits thought to be 5-6,000 years old, and Gastil et al. (1975) also considered the southern cones of Picacho Vizcaino and Sudoeste to possibly be less than 3,000 years old. However, Ar-Ar dating (Ortega-Rivera et al., 2004) restricted eruptions to a range of about 180,000 to 20,000 years ago.

Text: Smithsonian Global Volcanism Program.

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