Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico
The lacustrine system developed in the basin of Mexico has been of great interest in studies of various geological and social disciplines. Its sediments preserve the history of the environmental changes that occurred during the late Quaternary. Between 2016 and 2018, a set of lacustrine sediment co...
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Universidad Nacional Autónoma de México
2022-07-01
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| Series: | Revista Mexicana de Ciencias Geológicas |
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| Online Access: | https://rmcg.unam.mx/index.php/rmcg/article/view/1687 |
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| author | Beatriz Ortega-Guerrero Sandra García Guadalupe Cruz Claudio Salinas Margarita Caballero Ismerai Reyes Lizeth Caballero |
| author_facet | Beatriz Ortega-Guerrero Sandra García Guadalupe Cruz Claudio Salinas Margarita Caballero Ismerai Reyes Lizeth Caballero |
| author_sort | Beatriz Ortega-Guerrero |
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The lacustrine system developed in the basin of Mexico has been of great interest in studies of various geological and social disciplines. Its sediments preserve the history of the environmental changes that occurred during the late Quaternary. Between 2016 and 2018, a set of lacustrine sediment cores were collected in the Xochimilco sub-basin, located south of the basin of Mexico. From these sedimentary sequences, a master sequence was constructed that represents the upper 66.5 m of the lacustrine deposits. For the establishment of its stratigraphic column, 15 lithotypes were defined from their sedimentary components in which the clastic components made up of silicates dominate, mostly silt and clay in size. The most abundant biogenic fraction is diatoms that frequently form oozes, and ostracods are a common component in most of the sequence, which locally form hashes. Interbedded with the clastic and biogenic lithotypes are volcaniclastic deposits. Eight lithological units were defined based on their dominant lithotypes. The time scale of the sequence is still uncertain for the oldest sediments; however, it is estimated that it covers the last 300000 to 350000 years. From this temporality, environmental oscillations of millennial scales are inferred. Diatom-rich laminated sediments represent the deepest phases in the lake. The deposits with higher biogenic and authigenic calcareous components indicate the phases of higher ionic concentration during which the lake was shallower. The detailed analysis of the stratigraphy and the description of the sedimentary components in Xochimilco allows to establish an initial interpretation of the variations in the depositional environments, and provides the base from which the detailed studies of paleoclimatic indicators will be supported.
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| format | Article |
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| institution | Kabale University |
| issn | 1026-8774 2007-2902 |
| language | English |
| publishDate | 2022-07-01 |
| publisher | Universidad Nacional Autónoma de México |
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| series | Revista Mexicana de Ciencias Geológicas |
| spelling | doaj-art-d9cd08a63c524cf2ac8219bf852848002025-08-20T03:25:34ZengUniversidad Nacional Autónoma de MéxicoRevista Mexicana de Ciencias Geológicas1026-87742007-29022022-07-0139210.22201/cgeo.20072902e.2022.2.1687Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central MexicoBeatriz Ortega-Guerrero0Sandra García1Guadalupe Cruz2Claudio Salinas3Margarita Caballero4Ismerai Reyes5Lizeth Caballero6Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, Coyoacán, Ciudad de México, C.P. 04510, Mexico.Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México.Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México.Facultad de Ciencias, Universidad Nacional Autónoma de México.Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, Coyoacán, Ciudad de México, C.P. 04510, Mexico.Instituto Tecnológico Superior de Venustiano Carranza, Av. Tecnológico S/N, Col. El Huasteco, Ciudad Lázaro Cárdenas, Venustiano Carranza, Puebla, MexicoFacultad de Ciencias, Universidad Nacional Autónoma de México. The lacustrine system developed in the basin of Mexico has been of great interest in studies of various geological and social disciplines. Its sediments preserve the history of the environmental changes that occurred during the late Quaternary. Between 2016 and 2018, a set of lacustrine sediment cores were collected in the Xochimilco sub-basin, located south of the basin of Mexico. From these sedimentary sequences, a master sequence was constructed that represents the upper 66.5 m of the lacustrine deposits. For the establishment of its stratigraphic column, 15 lithotypes were defined from their sedimentary components in which the clastic components made up of silicates dominate, mostly silt and clay in size. The most abundant biogenic fraction is diatoms that frequently form oozes, and ostracods are a common component in most of the sequence, which locally form hashes. Interbedded with the clastic and biogenic lithotypes are volcaniclastic deposits. Eight lithological units were defined based on their dominant lithotypes. The time scale of the sequence is still uncertain for the oldest sediments; however, it is estimated that it covers the last 300000 to 350000 years. From this temporality, environmental oscillations of millennial scales are inferred. Diatom-rich laminated sediments represent the deepest phases in the lake. The deposits with higher biogenic and authigenic calcareous components indicate the phases of higher ionic concentration during which the lake was shallower. The detailed analysis of the stratigraphy and the description of the sedimentary components in Xochimilco allows to establish an initial interpretation of the variations in the depositional environments, and provides the base from which the detailed studies of paleoclimatic indicators will be supported. https://rmcg.unam.mx/index.php/rmcg/article/view/1687paleoclimatepaleolakesXochimilcolate Quaternarystratigraphy |
| spellingShingle | Beatriz Ortega-Guerrero Sandra García Guadalupe Cruz Claudio Salinas Margarita Caballero Ismerai Reyes Lizeth Caballero Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico Revista Mexicana de Ciencias Geológicas paleoclimate paleolakes Xochimilco late Quaternary stratigraphy |
| title | Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico |
| title_full | Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico |
| title_fullStr | Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico |
| title_full_unstemmed | Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico |
| title_short | Holocene and Upper Pleistocene stratigraphy of Xochimilco lake, central Mexico |
| title_sort | holocene and upper pleistocene stratigraphy of xochimilco lake central mexico |
| topic | paleoclimate paleolakes Xochimilco late Quaternary stratigraphy |
| url | https://rmcg.unam.mx/index.php/rmcg/article/view/1687 |
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