The gralic coastal properties of the name of the game. From Cliff Herbeira, within the north province of Corun, in Cabo Ortegal, thru Lalin international locations, there are more than a few metamorphic and magnetic rocks coming from very deep spaces of Earth’s cortex or, even sheaths and really prime pressures and temperatures.
Those rocks point out huge tectonic processes, such because the closure or seams of the sea and convergence between continents. You should go back about 400 million years to needless to say procedure.
Migmatite (metamorphism with partial fusion), from Savinao (Lugo). Victor Barrientes. From the depths of time
In accordance with type type type, continental mass differed in relation to their place all through the historical past of the planet, accumulating in gigantic lots (akin to superconforming pangea) and keeping apart the sea opening between them.
The Wilson cycle is named a protracted procedure that explains how the continent is split into two portions (continental expansion), to shape an ocean that can enlarge and create dorsal, the place the sea cortex bureaucracy. A bit little bit of little, the ones continental mass collided with others and shut the oceans. On this collision, huge mountain vary (orogenic) are born, which will comprise lithological stays of the lacking ocean, rocks known as Ophiolite.
Basement – magnetic and metamorphic rocks, which mainly the sedimentary rocks and Earth Cortex, include the stays of the previous continental collision, which created a big mountain vary of Kododa, Varisco Oroga.
This mountain vary has been advanced at other levels all through decrease Paleozoic, about 550 and about 330 million years in the past, because of the struggle between two huge continental lots: Laurasia in north and Gondana, within the south.
Lithof’s structures intrude within the tectonic plate. Wikimedia Commons., CC of
All the way through the collision, the sea was once closed, however within the procedure, small elementary swimming pools had been created. The stays of those ocean spaces are recently preserved.
At the fringe of this southern mass, land can be land that can due to this fact shape the Iberian massif, which might be the oldest fabrics of the peninsula. Exactly, this is the preferred expenditure of Orogens, despite the fact that Ophioly Variscola too can realize in Cornwall, Bretani or Bohemian Massif.
From the intensity of the earth
Metamorphic rocks – shaped from others ahead of conditioning within the nation – denoting that beginning in prime depths and prime force composed of silicating, akin to pyrococens, amphifoles or halrats.
Egirina, Potiary Circle of relatives. Wikimedia Commons.
In Galicia, they principally seem in 3 huge metamorphic complexes: that with CABO ortegal-world-winter UNESCO-MALPICA-TRUI and instructions.
All constituted rocks had been shaped at a undeniable distance from its present location, which one day was once a part of the sea cortex or sediments on it and that have been metamorphized in a big intensity all through that continental convergence. As well as, there are stays of magnetic rocks of ocean peel, akin to basins, gabros and peridotites, which, with other levels of exchange, grouped as one lithology known as Ophiolytes.
Bassault in form and cast. Wikimedia Commons., CC of
This gigantic surprise led to them to displace a big experience at the current nation. Because of this, it is named Aloctonsos complexes – don’t come from the place they’re.
In those complexes we discover 3 gadgets of various rocks, with opposite stratigraphic temper, or with essentially the most trendy fabrics on the backside. They’re two gadgets of continental affinity separated by way of the sea unit.
There are metamorphin sediments in basal gadgets, with maximum granite magnetic rocks.
In Opholority Devices, we believe magnetic rocks (Gabros and Peridotitas), deficient in silicone, standard of Ocean Cortex, which set the compression mechanisms which are liked by way of the bottom density of this kind of ophtha.
3rd, in higher gadgets, metamorphic rocks (amphibolites, granules) shaped at prime temperatures and prime force are abounded. That is issued by way of the subduction zone, the place the sea cortex sinked underneath continental and finally ends up melting. A few of these rocks constitute the most important issued planets in Cabo Ortegal, akin to eclogiit, standard for the submitual procedure. Most often, they’re thick rocks from the former ones.
Main points of the subduction zone. Wikimedia Commons., CC will be told extra
The geological exemptions of this house is mirrored in a considerable amount of works performed within the house for the reason that Seventies. In Spain, it’s value realizing the paintings of Groups of Jose Ramon Martinez Catalan, on the College of Salamanca, on the College of Madrid, or dozens of theses of Galicia Geology, printed the Kseloki College Institute,
The granite canyon of the EUME river (A Coruna). Victor Barrientes.
In 2023. UNESCO constituted the arena’s cloak ortegal geopark, the place we will to find nearly all rocks cited within the article.
These days you’ll see a an identical geological situation, with the introduction of small oceanic swimming pools, between Jamaica and Puerto Rico, the place the North American Plate and Caribbean crash.
As a result of, even supposing slowly, continents proceed to collide, and the oceans nonetheless shut in this colourful planet known as the Earth.
