| Autor: |
A. Huidobro-González, O. Delgado-Rodríguez, J. Lermo-Samaniego, J. O. Campos-Enríquez, Huizar-Alvarez, R. |
| Jazyk: |
English<br />Spanish; Castilian |
| Rok vydání: |
1997 |
| Předmět: |
|
| Zdroj: |
Geofísica Internacional, Vol 36, Iss 4, Pp 217-233 (1997) |
| Druh dokumentu: |
article |
| ISSN: |
0016-7169 |
| Popis: |
The main features of the hydrogeologic system in the Apan and Tochac sub-basins of the basin of Mexico are described from gravity, magnetic, resistivity, hydrogeological, and geochemical data. Both sub-basins have about 600 m of vol¬cano-sedimentary infill, and are separated by the NE-SW trending Apan range. Gravity and magnetic data indicate that the Apan range is emplaced along a major NE-SW trending fault along the extension of a regional lineament joining the Tlaloc and Telapon volcanoes. The Apan sub-basin has low-level seismic activity. A correlation with borehole data confirms a model of the hydrogeologic system which includes intergranular, mixed and fissured aquifers with transmissivities between 5.7 x 10-3 m2/sec and 1.1 x 10-1 m2/sec, and permeability around 4.0 x 10-4. The fissured aquifer is the recharge area, while the other two aquifers constitute a semi-confined aquifer whose only discharge comes from well pumping. The unsaturated zone is 60 m thick and the potentiometric surface fluctuates 0.30 m yearly. However, in places no fluctuations were ob¬served. The thickest portion of the aquifer, as delimited by vertical electric soundings and boreholes, is in the southern por¬tion of the Tochac sub-basin. Resistivity values and hydrogeochemical studies indicate the presence at depth of good qual¬ity, slightly mineralized water. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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