Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S)
The orogenic front at 37°S has been mainly formed through at least two contraccional stages, as inferred from the exhumed major angular unconformities at the Late Eocene and the Late Miocene times respectively. A Late Cretaceous event is restricted to the hinterland zones in the Main Cordillera. A s...
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Servicio Nacional de Geología y Minería (SERNAGEOMIN)
2012
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oai:scielo:S0718-710620120002000012012-07-11Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S)Sagripanti,LucíaBottesi,GermánKietzmann,DiegoFolguera,AndrésRamos,Víctor A Central Andes Malargüe fold and thrust belt Foreland basin Synorogenic deposits Argentina The orogenic front at 37°S has been mainly formed through at least two contraccional stages, as inferred from the exhumed major angular unconformities at the Late Eocene and the Late Miocene times respectively. A Late Cretaceous event is restricted to the hinterland zones in the Main Cordillera. A series of syntectonic sedimentary packages, that thin to the east is identified through a detailed description of the cannibalized westernmost Neogene foreland basin associated with the Sierra de Reyes. Their detrital microscopic and macroscopic descriptions reveal that the Neogene basin was fed from the west and particularly from the eastern Sierra de Reyes slope at the time of mountain incision. Detrital composition of the upper section reveals that a metamorphic component is present, implying that a domain further east has been exhumed, and therefore that the westernmost foreland basin has been cannibalized. This also implies that exhumation previous to Miocene times should have been minimum in the area, since the Neogene succession represents a complete unroofing. The structural cross sections show Neogene shortening of about 20%, leaving in comparison Eocene contraction as negligible.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.39 n.2 20122012-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062012000200001en |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Central Andes Malargüe fold and thrust belt Foreland basin Synorogenic deposits Argentina |
| spellingShingle |
Central Andes Malargüe fold and thrust belt Foreland basin Synorogenic deposits Argentina Sagripanti,Lucía Bottesi,Germán Kietzmann,Diego Folguera,Andrés Ramos,Víctor A Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S) |
| description |
The orogenic front at 37°S has been mainly formed through at least two contraccional stages, as inferred from the exhumed major angular unconformities at the Late Eocene and the Late Miocene times respectively. A Late Cretaceous event is restricted to the hinterland zones in the Main Cordillera. A series of syntectonic sedimentary packages, that thin to the east is identified through a detailed description of the cannibalized westernmost Neogene foreland basin associated with the Sierra de Reyes. Their detrital microscopic and macroscopic descriptions reveal that the Neogene basin was fed from the west and particularly from the eastern Sierra de Reyes slope at the time of mountain incision. Detrital composition of the upper section reveals that a metamorphic component is present, implying that a domain further east has been exhumed, and therefore that the westernmost foreland basin has been cannibalized. This also implies that exhumation previous to Miocene times should have been minimum in the area, since the Neogene succession represents a complete unroofing. The structural cross sections show Neogene shortening of about 20%, leaving in comparison Eocene contraction as negligible. |
| author |
Sagripanti,Lucía Bottesi,Germán Kietzmann,Diego Folguera,Andrés Ramos,Víctor A |
| author_facet |
Sagripanti,Lucía Bottesi,Germán Kietzmann,Diego Folguera,Andrés Ramos,Víctor A |
| author_sort |
Sagripanti,Lucía |
| title |
Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S) |
| title_short |
Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S) |
| title_full |
Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S) |
| title_fullStr |
Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S) |
| title_full_unstemmed |
Mountain building processes at the orogenic front: A study of the unroofing in Neogene foreland sequence (37°S) |
| title_sort |
mountain building processes at the orogenic front: a study of the unroofing in neogene foreland sequence (37°s) |
| publisher |
Servicio Nacional de Geología y Minería (SERNAGEOMIN) |
| publishDate |
2012 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062012000200001 |
| work_keys_str_mv |
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