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      Provenance ages of late Paleozoic sandstones (Santa Rosa Formation) from the Maya block, SE Mexico: Implications on the tectonic evolution of western Pangea

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          Abstract

          The Santa Rosa Formation in the State of Chiapas is a sequence of flysch-type sediments of Mississippian to Pennsylvanian age. These sedimentary rocks correlate with the Santa Rosa Group of Guatemala and Belize and crop out along the southern limit of the Maya block north of the Motagua fault, which is currently considered the border between the North American and the Caribbean plates. Ages of individual zircon grains from sandstones of the Upper Santa Rosa Formation in southern Mexico were analyzed by Laser Ablation Multicollector ICPMS and by SHRIMP. The youngest zircon population is of Silurian age (˜420 Ma), but most grains have ages that correspond to the Pan-African-Brasiliano orogenic cycle (500-700 Ma). Other minor populations have ˜820 Ma, Grenville (1.0-1.3 Ga), Mesoproterozoic (1.4-1.6 Ga), Paleoproterozoic (1.8-2.2 Ga), and Archean (2.7-3.1 Ga) ages. Most of the sediments came from either present-day West Africa or NE South America, where both Pan-African-Brasiliano orogens and cratonic landmasses are present. In our model, southwestward progressive collision of Gondwana with Laurentia during the Alleghanian orogeny resulted in erosion and deposition of flysch-type sediments to the west, followed by westward movement of the Maya block and adjacent lithosphere.

          Translated abstract

          La formación Santa Rosa en el estado de Chiapas es una secuencia de sedimentos tipo flysch de edad Misisípica a Pensilvánica. Estas rocas sedimentarias correlacionan con el Grupo Santa Rosa de Guatemala y de Belice y afloran a lo largo del límite sur del bloque Maya al norte de la falla Motagua, la cual se considera actualmente como el límite entre las placas de Norteamérica y del Caribe. Se analizaron edades de zircones individuales de areniscas de la Formación Santa Rosa Superior en el Sur de México por ICPMS multicolector con ablación con láser y con SHRIMP. La población más joven de zircones es de edad silúrica (˜420 Ma), pero la mayoría de los zircones tiene edades que corresponden con el ciclo orogénico Pan-Africano-Brasiliano (500-700 Ma). Otras poblaciones menores tienen edades de ˜820 Ma, del Grenvilleano (1.0-1.3 Ga), del Mesoproterozoico (1.4-1.6 Ga), del Paleoproterozoico (1.8-2.2 Ga) y del Arqueano (2.7-3.1 Ga). La mayoria de los sedimentos proviene del oeste de Africa o del este de Sudamérica, donde se encuentran tanto orógenos con edades del ciclo Pan-Africano-Brasiliano como cratones precámbricos. En nuestro modelo, la colisión progresiva entre Gondwana y Laurentia durante la orogenia Alleghaniana resultó en erosión y deposición de los sedimentos flyschoides hacia el oeste, seguido por un movimiento del bloque Maya y la litosfera adyacente en dirección poniente.

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          Tectono-stratigraphic terranes and mineral resource distributions in Mexico

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                Author and article information

                Journal
                rmcg
                Revista mexicana de ciencias geológicas
                Rev. mex. cienc. geol
                Instituto de Geología, UNAM (México, DF, Mexico )
                1026-8774
                2007-2902
                2006
                : 23
                : 3
                : 262-276
                Affiliations
                [01] Ensenada BC orgnameCentro de Investigación Científica y de Educación Superior de Ensenada orgdiv1División Ciencias de la Tierra Mexico bweber@ 123456cicese.mx
                [04] Querétaro orgnameUniversidad Nacional Autónoma de México orgdiv1Centro de Geociencias Mexico
                [02] México D.F orgnameUniversidad Nacional Autónoma de México orgdiv1Instituto de Geofísica orgdiv2Instituto de Geología Mexico
                [03] Tucson AZ orgnameUniversity of Arizona orgdiv1Department of Geosciences U.S.A
                Article
                S1026-87742006000300002 S1026-8774(06)02300300002
                d3ec830d-9851-47bd-97af-6e89a0dfc039

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 14 March 2006
                : 07 July 2006
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 59, Pages: 15
                Product

                SciELO Mexico

                Categories
                Articles

                Pan-African-Brasiliano,Gondwana,SE Mexico,sediments,zircon,provenance ages,Pan-Africano-Brasiliano,SE México,sedimentos,zircón,edades de proveniencia

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