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espanolEn el sector SW del Macizo de Santander (concretamente en el area de los municipios Mogotes y San Joaquin) afloran rocas Paleozoicas (con y sin metamorfismo), las cuales han sido agrupadas y cartografiadas como parte de la Formacion Floresta (de edad Devonico). Estudios realizados en el marco del presente trabajo, muestran que esta formacion puede ser dividida en al menos tres miembros: (a) un miembro basal con foliacion metamorfica (compuesto principalmente de rocas de aspecto filitico de grano fino a ligeramente conglomeraticas, de composiciones cuarzosas-peliticas) con edades U-Pb en zircones detriticos de 410 Ma (Devonico Temprano); (b) un miembro medio sin evidencias de metamorfismo (compuesto mayoritariamente de areniscas y lodolitas) con edades U-Pb en zircones detriticos en torno a 372 Ma (limite Devonico Medio-Tardio) y; (c) un miembro superior (predominantemente lodolitico), el cual no pudo ser datado por dificultados para encontrar y concentrar sus zircones detriticos (probablemente de edad Devonico Tardio?). Con base en las maximas edades estratigraficas obtenidas (derivadas de las edades U-Pb en zircones detriticos ya mencionadas), se propone correlacionar temporalmente el miembro basal con la Formacion Tibet y el miembro medio con la Formacion Floresta. Aunque el miembro superior no ha podido ser datado, se infiere que este podria correlacionarse temporalmente con la Formacion Cuche (unidades descritas en el Macizo de Floresta). Estratigraficamente por encima de las rocas Devonicas antes referidas, se observan capas relativamente restringidas de areniscas calcareas y abundantes calizas, margas y lodolitas. Con base en estudios paleontologicos previos y edades U-Pb en zircones detriticos aqui obtenidas (en rocas lodoliticas de la parte superior de este registro sedimentario; pico de edades en torno a 288 Ma), es posible sugerir que estas rocas se correlacionan con la unidad denominada ‘Paleozoico del Rio Nevado’ (consideradas de edad Carbonifero-Permico). EnglishIn the southwestern of the Santander Massif (specifically in the area of Mogotes and San Joaquin towns) outcrop Paleozoic rocks (with and without metamorphism), which have been grouped and mapped as part of the Floresta Formation (Devonian in age). Studies carried out in the framework of this work show that this formation can be divided at least into three members: (a) a basal member with metamorphic foliation (composed mainly of fine-grained and slightly conglomeratic phyllite-like rocks, quart-pelitic in composition) with detrital zircon U-Pb ages of 410 Ma (Early Devonian); (b) a middle member with no evidence of metamorphism (composed mostly of sandstone and mudstone) with detrital zircon U-Pb ages around 372 Ma (Late-Middle Devonian boundary) and; (c) an upper member (predominantly mudstone), which could not be dated by difficulties to find and concentrate their detrital zircons (probably late Devonian in age?). Based on the maximum stratigraphic ages here obtained (derived from the detrital zircon U-Pb ages already mentioned), it is proposed to correlate (in time) the basal member with the Tibet Formation and the middle member with the Floresta Formation. Although the upper member could not be dated, it is inferred that this could be temporarily correlated with the Cuche Formation (units described for the Floresta Massif). Stratigraphically above the Devonian rocks (previously referred), layers of calcareous sandstones (relatively restricted), abundant limestones, calcareous mudstones and mudstones are observed. Based on previous paleontological studies and detrital zircon U-Pb ages here reported (in mudstones of the upper part of this sedimentary record, with a peak age around 288 Ma), it is possible to suggest that these rocks correlate with the unit called ‘Paleozoic of the Nevado River’ (considered Carboniferous-Permian in age).

Geología y geocronología de las litologías aflorantes en el tramo Mogotes-San Joaquín (sector SW del Macizo de Santander)