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En los límites de bloques, la mineralización está afectada por varios episodios de fracturación y brechificación durante los cuales precipitaron y/o se movilizaron diversas generaciones de calcita, barita, cuarzo y galena. El Chichón was built on folded Cretaceous to Miocene sedimentary rocks, established ~150 km north of the position of a Miocene arc that existed in the southernmost Maya block. He moved again to Italy in 1962 where he started a collaboration with the children's comic book magazine Il Corriere dei Piccoli, for which he adapted several classics of adventure literature, including Treasure Island and Kidnapped by Robert Louis Stevenson. It juxtaposes western oceanic terranes (Arquia and Quebradagrande Complexes of Colombia, Alao, Guamote, Pallatanga, Macuchi, Piñon, El Oro and Raspas Complexes of Ecuador) to eastern .
Above data support such a tectonic model, that is, during the Early Cretaceous (from ~135 Ma or even earlier), a typical trench–arc–basin system developed in the Caribbean region as a result of southwest-directed subduction of the Proto-Caribbean plate beneath the Caribbean plate; after that time, uninterrupted Proto-Caribbean plate subduction occurred, generating quasi-continuous arc magmatism from before ~135 to 81 Ma, and gradually consuming the Proto-Caribbean Ocean. Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content? In general, two principal structural levels can be distinguished in the geological structure of Cuba. Oligocene and younger sections are dominated by clastic sedimentary rocks which fill deep basins north and south of the present Cordillera Central. A relatively simple method that uses a minimum of specialized equipment, yet allows a large variety of microalgae to be cryopreserved with high viability, can be found on the Cryopreservation of Microalgae page.The Proto-Caribbean basin (related to the Central Atlantic) formed in between the Americas during Jurassic-late Cretaceous time and started westerly-directed subduction below the Pacific (Farallon plate) in the early Cretaceous, forming backarc, forearc and arc settings in the leading edge of the Caribbean plate (Boschman et al.
This latter accretionary event was triggered by an enhanced mid - Atlantic rifting and the inception of the Pacific Superplume event that ultimately gave rise to the Caribbean plate.These intrusive units are interpreted to represent crustal melts which formed during the Triassic- Jurassic break-up of Pangea, reflecting a regional thermal event. It consists of a Jurassic- Cretaceous mainly marine sedimentary sequence now exposed as a thrust and fold belt along the northern edge of the Cuban mainland. Inset box 2: onset of SW-dipping subduction at backthrusts, with HP/LT rocks already in hanging wall. W. Unconformably overlying the metamorphosed Duarte Formation are vitric basalts of the Siete Cabezas Formation, and unconformably overlying the Maimon Formation are pyroxene andesite and tuff of the Peravillo Formation.
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