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| Titel |
Initial Report on MexiDrill: The Basin of Mexico Drilling Program |
| VerfasserIn |
Erik Brown, Josef Werne, Margarita Caballero, Enrique Cabral, Peter Fawcett, Socorro Lozano, Eric Morales, Amy Myrbo, Anders Noren, Ryan O'Grady, Beatriz Ortega, Liseth Perez, Doug Schnurrenberger, Antje Schwalb, Victoria Smith, Byron Steinman, Mona Stockhecke, Blas Valero, Sebastian Watt |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130633
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| Publikation (Nr.) |
 EGU/EGU2016-10914.pdf |
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| Zusammenfassung |
| The Basin of Mexico (19°30’N, 99°W, 9600 km2, 2240 m asl) is a hydrologically-closed basin in the TransMexican Volcanic Belt. The emergence of the Chichinautzin volcanic field after ~780 ka is linked to basin closure and initiation of the development of a lake system within the basin. Continued subsidence accommodated accumulation of a long lacustrine sediment sequence. Radiocarbon chronologies indicate sedimentation rates of ~40 cm/kyr since ~40ka; application of this rate to the entire lacustrine sequence suggests a basal age of ~800 ka, consistent with the Chichinautzin volcanic age.
To investigate the environmental history contained in Basin of Mexico sediments, the MexiDrill Program recovered a long lacustrine sedimentary sequence contained in the Lake Chalco basin on the southern outskirts of Mexico City. These sediments have the potential to provide a >500,000 year record of North American climate. Chalco is well suited for reconstruction and investigation of interannual through orbital-scale variations in the North American Monsoon and hydrologic variations of the neotropics. Ongoing work suggests that the system records environmental responses to both Milankovitch- and millennial-scale climate forcing. |
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