Island dating sites near Saltillo Mexico
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The observed anomalies contain the effects of both shallow and deep bodies, reflected in the gravity response as the sum of short and long wavelengths. We performed the separation of regional and residual components of the Bouguer anomaly and magnetic anomaly, to conduct a qualitative analysis, and selected two profiles were selected for 2.
The models presented here were developed based on the total magnetic anomaly, Bouguer anomaly and residual Bouguer anomaly, and were supported by the work of Aranda et al. To highlight local anomalies, the regional component of the gravity or magnetic anomaly field is commonly subtracted from the data, generating a residual map. The definition of regional vs.
Regional-local separation can be achieved by band pass wavelength filtering, but as previously mentioned, this procedure requires assuming the cut-off wavelengths, which can smear the separation due to non-vertical filter roll-off, and can contaminate the data by Gibbs ringing. It is more intuitive to compute from the gridded data the best-fit smooth surface, of an optimal low order, and then remove that smooth surface as the regional component.
Good results in northern Mexico, including La Popa Basin, are obtained by subtracting from the data a third-order best-fit surface.
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Gravity data benefited from this procedure the most, whereas no significant improvement was obtained for the magnetic data. The procedure and technology of data interpretation was generally described in publications of one of the co-authors Yutsis et al. In this case the data were extracted from the complete Bouguer anomaly chart and magnetic anomaly map. The profiles were located across and along the structural elements of the La Popa Basin. The resulting models obtained are shown in Figs. The gravity line demonstrates a significant elevation of anomaly from mGal in the SW up to mGal in the NE part of the profile.
It is possible to recognize a zone of relatively high gravity gradient in the south part of the model. This zone is also characterized by topographic low. Magnetic anomaly showing amplitudes between and nT. The central part of the model corresponding to the central part of the Basin area is characterized by relatively high intensive anomalies. The highest magnetic anomaly is located in the NE part of the basin.
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Two high-gradient zones are located in the same areas as topography and gravity irregularities. Integrated geological-geophysical interpretation was based on gravity and magnetic models constructed using Geosoft and WingLink software.
The methodology to select two modeled profiles consisted on the selection of representative structures of the area of study and to that they could also verify if the structural sections compiled by Aranda et al. Later, they were located on the MDE and gravity and magnetic maps that represent the effect of the structures that cross the profiles; with this it was possible to select the maps that isolate the effect of deep structures by gravity and to see the effect of Mesozoic sedimentary block and the magnetic response of the crystalline basement.
The profile A - A ' Fig. Anticline Los Muertos corresponds to a fold-off of Jurassic evaporites, the anticline Venado of the Parras Basin suggests a hybrid fold, where you firstly had a fold-off, and then its northern flank elevation is modified by salt developing a drape fold. The Delgado syncline developed by evacuation of evaporites, the anticlines El Lobo and El Gordo are a fold hybrid, where structure possibly was formed by a wall halo-kinetic salt and subsequently amended during contraction to a fold of two detached diapirs, one on each side of it El Gordo y El Papalote.
The halo-kinetic structure La Soldadura Giles and Lawton, has been considered as a wall of salt La Popa Fold , and finally the model proposes a basement inversion which should help the La Soldadura development Aranda et al. The model shows that the Mesozoic sedimentary sequence lies on the salt.
This sequence is altered by the plastic properties of salt and its incompressibility prompting the inversion of densities in the area causing this migration to the periphery of the La Popa Basin,. The profile B - B ' Fig. Similar structures have been reported in the Sabinas Basin by Peterson-Rodriguez et al. The Bouguer anomaly map was used for this model, because the anticlines of interest correspond to high frequency negative anomalies related to shallow bodies, specifically the accumulation of evaporites in the cores of the structures.
The total magnetic anomaly reduced to pole for the crystalline basement mapping was used. This information was supported by structural sections constructed by Aranda et al.
The cores of anticlines covered by this profile are eroded, so we combined information of the evaporite outcrops, data of the well Minas Viejas 1, which drilled a section of evaporites of 4. Finally, we obtained the thickness of evaporite at the core of the anticlines more than 4 km Potrero Chico, Potrero Garcia anticlines.
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The anticline Minas Viejas also shows in its core a thickness of more than 5 km and a length of 1 km. The morphology of the basement in the model corresponds to a graben-like depression, being composed of schist and granite Fig. Gravity data in the northeast Mexico basins are sensitive to local vertical offsets across high-angle faults, where rocks with different densities are juxtaposed. Yet, high densities in some Mesozoic sedimentary rocks just above the basement may smear out the subtle gravity traces of basement faults.
Full view. Linta River Delta and Dunes Published October 12, An astronaut shot this photograph of a complex shoreline environment in southern Madagascar. Oregon Museum of Science and Industry. Science 58— Get our newsletter! Excellent location. Perhaps we might've had better success had we reached Cuidad Del Carmen but the feeling of being the only tourists in the area was surprisingly not the greatest feeling.
Notably, in the Coahuila block in northwestern part of the area, where vertical basement-fault offsets reach tens and hundreds of meters, the associated gravity anomalies are not strong. The total-field magnetic data were used, with the International Geomagnetic Reference Field removed. The sedimentary cover in northeast Mexico is generally considered to be almost non-magnetic, and the anomalies are sourced overwhelmingly in the crystalline basement. Geological-geophysical model 2.
Steep, straight faults are commonly expressed as subtle potential-field lineaments, which can be gradient zones, alignments of separate local anomalies of various types and shapes, aligned breaks or discontinuities in the anomaly pattern, and so on. Many large magnetic and gravity anomalies represent the ductile, ancient, healed basement structures, obscuring the desirable subtle features. Subtlety of the desirable lineaments need detailed data processing, using a wide range of anomaly-enhancement techniques and display parameters.
So data processing includes Fourier transformation, wave-length filters, upward and down ward continuation, vertical and horizontal derivates, analytic signal analysis, etc. Geological-geophysical 2. It is well known that the nucleus of anticlines here are characterized by accumulation of evaporates, so we propose that the observed gravity minima correspond to the most important accumulations of salt in the area. This phenomenon is shown in model B - B '. Then more recent Mesozoic sedimentary rocks were deposited on the salt basement and caused a significant lithostatic pressure.
His area of study is crucial to conservation, as plants are the biological foundation of all terrestrial ecosystems, he said. Today, fewer than remain. The last Montezuma cypress forest in the Rio Grande Valley sits in the heart of Brownsville and recently was declared a city park; the remaining trees are spread out along the banks of the river and near some resacas. McDonald and his colleague, Dr. It has never been developed.
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We need more data and plant collection along the border. HolmesSaltillo wrote a review Jan Saltillo, Mexico 57 contributions 23 helpful votes. Not worth the time. Went there to watch dolphins on January, there were more boats searching and following than dolphins, we only saw 3, and no closer than 40 feet.
Then you go to a small island that you can walk around in less than 30 minutes and back. Maybe on other dates there are more dolphins, if you're not sure you can skip this. Date of experience: January Stefani S wrote a review Nov Unless you want desolate.. Although the drive was scenic along the coast, the scenery was somewhat depressing, as there was abandoned cabanas and buildings along the beaches throughout the drive. Let me say that I am not opposed to 'quiet', but there were literally no other people on any of the beaches, which weren't even that nice, with lots garbage littered about and strong smells of sewage and rotting garbage.
Once we actually reached the Isla, there didn't seem to be much of anything for the public. We did come in 'off' season November 16 , but even restaurants complete with signage seemed complete deserted or even abandoned. We made it about 15 kms from Cuidad Del Carmen before we gave up and turned around. We read that one would have to pay a local fisherman or seek a boat to tour for dolphin sightings, but quoted just under pesos just didn't seem worth the trouble, although I would consider seeing dolphins in the wild a once in a lifetime opportunity.
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We decided we would be better off to do an actual dolphin tour in Cancun than go any further on this 'Island'. The positives of the day trip was a scenic drive along the water. Perhaps we might've had better success had we reached Cuidad Del Carmen but the feeling of being the only tourists in the area was surprisingly not the greatest feeling. We were also warned by a Campeche local that crime is high in the area, as it is an area known for oil patches and a lot of workers have been apparently out of jobs.
If you want to feel like you are the only person on an abandoned not-so-island, then look no further.