Estratigrafía de la margen occidental de la cuenca San José del Cabo, Baja California Sur

Arreguín-Rodríguez, Gabriela J.; Schwennicke, Tobias

doi:10.18268/bsgm2013v65n3a4

Cited by 10 publications

(13 citation statements)

References 17 publications

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“…The regressive deposits of the overlying Refugio formation (considered as early Pliocene to late Pliocene) are composed of sandstones interbedded with fossiliferous limestones and shales, passing progressively upward (and also laterally) into the continental Los Barriles formation at the top which consists of sandstones and conglomerates containing submetric to metric boulders. In the northern part of the basin, and near the San José del Cabo fault, Arreguín‐Rodríguez and Schwennicke [] describe some evidence of interfingering between the Los Barriles and Trinidad formations that implies their coeval deposition, probably during the Pliocene, which would modify the chronology established by Martínez‐Gutiérrez and Sethi [].…”

Section: Geological Settingmentioning

confidence: 99%

Miocene detachment faulting predating EPR propagation: Southern Baja California

et al. 2016

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At the southern tip of the Baja California peninsula, we characterize the onshore structures and kinematics associated with crustal necking leading up to the Pliocene breakup and early East Pacific Rise seafloor spreading. From a combination of tectonic field investigations, K‐Ar and cosmogenic isotope dating and geomorphology, we propose that the Los Cabos block represents the exhumed footwall of a major detachment fault. This north trending detachment fault is marked by a conspicuous low‐dipping brittle‐ductile shear zone showing a finite displacement with top to the SE ending to the ESE. This major feature is associated with fluid circulations which led to rejuvenation of the deformed Cretaceous magmatic rocks at a maximum of 17.5 Ma. The detachment footwall displays kilometer‐scale corrugations controlling the present‐day drainage pattern. This major detachment is synchronous with the development of the San José del Cabo Basin where syntectonic sedimentation took place from the middle Miocene to probably the early Pliocene. We propose that this seaward dipping detachment fault accommodates the proximal crustal necking of the Baja California passive margin, which predates the onset of formation of the East Pacific Rise spreading axis in the Cabo‐Puerto Vallarta segment. Our data illustrate an apparent anticlockwise rotation of the stretching direction in Baja California Sur from ~17 Ma to the Pliocene.

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Section: Geological Settingmentioning

confidence: 99%

Miocene detachment faulting predating EPR propagation: Southern Baja California

et al. 2016

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“…Calera, composed of fluvial conglomerate and sandstone dating medium to superior Miocene; Fm. Trinidad, composed of laminated and no laminated shale and sandstones dating Late Miocene to late Pliocene [31]; Fm. Refugio, composed of course gran bioclastic sandstone of Pliocene [31]; Fm.…”

Section: Geology and Hydrogeologymentioning

confidence: 99%

“…Trinidad, composed of laminated and no laminated shale and sandstones dating Late Miocene to late Pliocene [31]; Fm. Refugio, composed of course gran bioclastic sandstone of Pliocene [31]; Fm. Barriles, compose by course conglomeratic and sandstone dated Pliocene [31]; and Fm.…”

Section: Geology and Hydrogeologymentioning

confidence: 99%

“…Refugio, composed of course gran bioclastic sandstone of Pliocene [31]; Fm. Barriles, compose by course conglomeratic and sandstone dated Pliocene [31]; and Fm. El Chorro, composed by fluvial coarse sandstone and conglomerated dated late Pleistocene to Holocene.…”

Section: Geology and Hydrogeologymentioning

confidence: 99%

“…For the period 2012 to 2016 the extraction was the same as in 2011 [15]. The hydraulic conductivity of the aquifer was estimated from the literature [7,8,28,[31][32][33][34] and finally obtained due to the calibration process.…”

Section: Model Creationmentioning

confidence: 99%

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Groundwater Flow Model and Statistical Comparisons Used in Sustainability of Aquifers in Arid Regions

2019

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Groundwater provides the most important of the water resources used in the maintenance of communities in arid and semi-arid regions. In these areas, the usage of deep wells with motorized pumps in combination with the lack of effective regulatory policies and high human population growth (increase the water demand) impact the quality of the groundwater. This is especially the case for the San José del Cabo aquifer, in Baja California Sur. In the present study the groundwater flow system is analyzed in order to recognize the impact from variations in groundwater extraction and recharge on the phreatic levels and discharge values. In order to achieve this goal, a groundwater model was generated using the MODFLOW program. Different scenarios of extraction and recharge were calculated, based on different estimations of population growth. All the scenarios result in decreasing groundwater levels. As an important result, a relationship between the phreatic level and the extraction volume was found for the middle zone of the aquifer, where an average annual decrease of 0.5 m was observed from every 5 × 10 6 m 3 additional extraction volume. This zone is up to three times more susceptible to changes in extraction values than the southern zone. As the results show, the San José del Cabo aquifer is in a fragile state where an increment in extraction is not an option without the use of remediation technics or new sources for water supply.Cabo San Lucas cities, and Ciudad del Sol [5,6]. This aquifer is considered over-exploited since 1985, and the water demand has increased since then, associated with a high rate of population increment (actually 3.8%) [5][6][7][8][9][10][11][12][13][14]. In 2018 an annual groundwater deficit of −5.9 × 10 6 m 3 was estimated for the San José del Cabo aquifer [15].The physical characteristics of the SJCB aquifer have been described by many authors, i.e., [16][17][18]. Recently the effect that climate change and anthropogenic pressures over the San José estuary (the southernmost part of the SJCB) has been studied [19]. However, the effect of the increasing population and its consequential demand for additional water resource has not been studied in the whole aquifer. The SJCB aquifer satisfies almost all the water demand that accounts for the San José del Cabo and Los Cabos region, and an increment on the extraction of water is expected in the future. Changes need to be done in the socio-environmental conditions in order to improve the sustainability in the water sector [6]. This includes water consumption, water quality, and aquifer management. The population growth rate is still high and increasing along with the groundwater extraction (although the aquifer is already over-exploited). In this study, the behavior of the water table under different scenarios of water recharge and extraction, associated with the increment of the population in the San José del Cabo region is analyzed. On the other hand, synthesizing the available data in the model will improve the hydrogeological understanding o...

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