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Mejillones Peninsula ( es, península de Mejillones) protrudes from the coast of northern Chile north of Antofagasta and south of the port of
Mejillones Peninsula ( es, península de Mejillones) protrudes from the coast of northern Chile north of Antofagasta and south of the port of Mejillones
Mejillones is a Chilean port city and commune in Antofagasta Province in the Antofagasta Region. Its name is the plural form of the Spanish meaning "mussel", referring to a particularly abundant species and preferred staple food of its indigeno ...
.
The basement
A basement or cellar is one or more floors of a building that are completely or partly below the ground floor. It generally is used as a utility space for a building, where such items as the furnace, water heater, breaker panel or fuse box, ...
rocks of the peninsula are made of metamorphic and igneous rock
Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main The three types of rocks, rock types, the others being Sedimentary rock, sedimentary and metamorphic rock, metamorphic. Igneous rock ...
s that formed in the Late Triassic
The Late Triassic is the third and final epoch (geology), epoch of the Triassic geologic time scale, Period in the geologic time scale, spanning the time between annum, Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch ...
plus pluton
In geology, an igneous intrusion (or intrusive body or simply intrusion) is a body of intrusive igneous rock that forms by crystallization of magma slowly cooling below the surface of the Earth. Intrusions have a wide variety of forms and com ...
s formed in the Early Jurassic. The eastern part of the peninsula hosts various normal fault
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...
s. Extensional tectonics
Extensional tectonics is concerned with the structures formed by, and the tectonic processes associated with, the stretching of a planetary body's crust or lithosphere.
Deformation styles
The types of structure and the geometries formed depend on ...
in the peninsula begun no later than in the Early Miocene and has resulted in the formation of two half graben basins
Basin may refer to:
Geography and geology
* Depression (geology)
** Back-arc basin, a submarine feature associated with island arcs and subduction zones
** Debris basin, designed to prevent damage from debris flow
** Drainage basin (hydrology), a ...
. The uplift that the peninsula had in the Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58Pleistocene
The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...
has been attributed to subcrustal accretion in the subduction system.
See also
* Arauco Peninsula * Atacama Fault * Coastal Cliff of northern Chile *Guano
Guano (Spanish from qu, wanu) is the accumulated excrement of seabirds or bats. As a manure, guano is a highly effective fertilizer due to the high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth. G ...
References
Peninsulas of Chile Landforms of Antofagasta Region Coasts of Antofagasta Region {{Antofagasta-geo-stub