Please use this identifier to cite or link to this item: http://cicy.repositorioinstitucional.mx/jspui/handle/1003/773
Aeromagnetic anomalies and structural model of the Chicxulub multiring impact crater, Yucatan, Mexico
MARIO REBOLLEDO VIEYRA
JAIME HUMBERTO URRUTIA FUCUGAUCHI
HECTOR LOPEZ LOERA
Acceso Abierto
Atribución-NoComercial-SinDerivadas
AEROMAGNETIC ANOMALY
CHICXULUB CRATER
MAGNETIC SUSCEPTIBILITY
MEXICO
STRUCTURAL MODEL
A structural model of the Chicxulub crater is derived from aeromagnetic anomaly modeling, borehole information and magnetic mineral data. Magnetic susceptibility measurements from borehole cores and samples in the crater show that suevite-like breccias have a variable strong magnetic signature, which is related to basement and melt clasts. The crystalline component estimated from clast analyses in the suevite-like breccias has on average higher magnetic susceptibilities (up to 1200×10-5 SI) than that of impact melt (~500×10-5 SI) and crystalline basement (400×10-5 SI). Reduction to thepole and downward analytical continuations show the discrete composite character of the anomaly, with inverse dipolar anomalies. The second-derivative of magnetic anomaly depicts five concentric rings, with the external ring correlating with the cenote ring and marking the surface expression of crater rim. The analytical signal and the radially averaged spectrum yield an estimate of theaveraged depth to the magnetic sources, ranging from 1000 to 6000 m. There are three major magnetic sources within the Chicxulub crater: 1) the melt unit, 2) the suevite-like breccia, and 3) thecentral uplift. Using all these data, including new 2-D magnetic models, a new structural model is proposed. It reveals a system of regional vertical faults that explain the magnetic signal over thesouthern sector of the crater, whereas a 2.5 km deep central uplift and highly magnetized breccia sequences and melt sheet might be the sources of the main magnetic anomalies.
2010
Artículo
Revista Mexicana De Ciencias Geologicas, 27(1), 185-195, 2010.
Inglés
Rebolledo-Vieyra, M., Urrutia-Fucugauchi, J., & López-Loera, H. (2010). Aeromagnetic anomalies and structural model of the chicxulub multiring impact crater, yucatan, mexico. Revista Mexicana De Ciencias Geologicas, 27(1), 185-195.
BIOLOGÍA Y QUÍMICA
Versión publicada
publishedVersion - Versión publicada
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