The Maracaibo block in the northwestern South America is a triangular lithotectonic terrane bounded on its western edge by the Santa Marta-Bucaramanga left-lateral strike-slip fault and the Oca-Ancon right-lateral strike-slip fault on its northern edge. Previous thermochronological studies in the region have shown three discrete exhumation pulses from Paleocene to Miocene that are attributed to various collisional and strike events along the Caribbean margin. However the tectonic origin of the late Neogene deformation that produced the isolated, high topography of the SSM and SP has remained unclear.
By analogy with late paleozoic orogeny in the Venezuelan Andes, Maracaibo Basin is en route to a granitic event. Postulated stages of orogeny in a continental crustal setting are:- 1.
maracaibo como cuenca: Topics by windpimeno.tk
Stresses of plate convergence lead to block uplift and complementary basin subsidence. This about doubles the thickness of K-rich sial. In situ heating of the flysch by radioactive decay provides a thermal gradient of c. After maximum crustal subsidence continued compression results in updoming of crust and overlying flysch. Cannibalism of flysch, cooling and mild subsidence follow; autometamorphism declines.
The unconformity a span of only Ma is of minor import. Resetting of the thermal profile of the depressed crust lags far behind that in the flysch. Parallels to the above in the Maracalbo basin fill are: -thickness approx. Presence of impermeable strata in the Maracaibo Basin suggests that large-scale fluid convection is inhibited; conductive models of heat transfer can be used. Computer modeling suggests that radiogenic heat, augmented by exothermic oxidation of organic matter, and with a normal mantle heat flow will explain the autometamorphism of the flysch.
Alternative orogenic models invoking pull-apart basins do not explain the great thickness of sediments and absence of volcanic activity. Despite the lack of significant land drainage in this semi-dessert environment, terrigenous material, probably wind-born, dominates the sinking particulate matter. Peak lithogenic fluxes appear to be associated with higher frequencies of wind gusts stronger than 5 ms Total mass flux fluctuated from week to week, and between years, averaging gm-2y-1, essentially the same as radiometrically-determined accumulation rates of about 0.
In , the passage of 2 hurricanes induced high winds and flash flooding and the total mass flux offshore remained very high for two weeks following each event. This unusual sedimentation was equivalent to that of a full year without hurricanes and such events may account for some of the laminations found in cores.
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During most of , on the other hand, sedimentation rates were lower than average. Although fluxes of all components tended to be highest during late fall and early winter, biogenic fluxes displayed peaks during all seasons of the year in Cuenca Alfonso. This is in contrast to the strong seasonal alternation between terrigenous sedimentation and diatom blooms observed in Guaymas Basin in the central Gulf.
Furthermore, calcium carbonate dominated over biogenic silica within the marine component. A preliminary study]. To determine the prevalence of Entamoeba histolytica as a producer of diarrhea, a study was conducted in children, less than five years of age, with diarrhea who attended several out patient clinics of the Servicio Aut6nomo Hospital Universitario, Maracaibo , Venezuela. A macroscopic and microscopic examination with physiological saline, lugol and Kinyoun staining were performed to the stool samples obtained. The two children who had E. We suggest that the prevalence of E.
The aim of this study was to determine the association of the GlySer polymorphism of the PGC-1 gene with insulin resistance and type 2 diabetes mellitus in subjects from the city of Maracaibo. The study was performed on 64 no-diabetic subjects 36 without insulin resistance and 28 with insulin resistance and 13 with type 2 diabetes. A clinical and nutritional history was carried out and the evaluation of anthropometric parameters was included. It was found that the allelic frequencies for A and G were 0. The population was found in genetic equilibrium of Hardy Weinberg.
According to the results, the polymorphism GlySer of the PGC-1 gene would be able to contribute to the cardiovascular risk in type 2 diabetics, while in the insulin resistant individuals, this polymorphism was not associated with cardiovascular risk factors. Existe evidencia suficiente para declarar a la tuberculosis como enfermedad ocupacional en diversos profesionales especialmente entre los trabajadores de salud.
The aim of this study was to determine the influence of perception of the environment in physical activity habits of schoolchildren aged years in the province of Cuenca , Spain.
Using a phenomenological perspective drawings were analyzed individual about their environment and places you normally would from a purposive sample of 32 students of 4th and 5th year of primary education. These same students participated in seven focus groups with a script aimed to obtain information on their perception of the environment and its influence on physical activity habits. The students perceived that reside in gated communities or in rural areas facilitates physical activity of schoolchildren, while residing in neighborhoods and cities less accessible, feeling of insecurity traffic, make car journeys, and the sense of not belonging or membership to the neighborhood were perceived by children as barriers to being active.
The perception of the environment influences physical activity habits of schoolchildren in the province of Cuenca. Changes in physical activity patterns of schoolchildren cannot take place without considering the context in which the individual exists, so specific strategies are needed that take into account the urban environment to promote physical activity of schoolchildren.
Published by Elsevier Espana. Late Holocene anthropogenic and climatic influences on the regional vegetation of Mexico's Cuenca Oriental. Scholars continue to debate the relative magnitude of pre- and post-Conquest anthropogenic landscape transformation in many regions of Mesoamerica. These debates have important implications for our understanding of the role of anthropogenic practices in the development, or at times degradation, of regional environments. Paleoecological records that provide long-term perspectives on climate change and human land-use patterns are critical to addressing these uncertainties.
However, many regions of Mexico including the Cuenca Oriental, a semi-arid basin in the rain shadow of the Sierra Madre Oriental, remain poorly studied. We present a new paleoecological record from sediment cores recovered from Lake Aljojuca, located in the southern part of the basin. Stable isotope analyses of authigenic carbonates provide an independent record of past climate, while pollen and microscopic charcoal provide insights into past vegetation and fire history.
The Aljojuca record is one of the only well-dated multi-proxy paleolimnological records from the Cuenca Oriental, and is one of few charcoal studies from highland Mexico.
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Zea mays pollen and increased fire activity at calendar years before present cal yr. BP suggest Formative period human settlement around the lake. Between and cal yr BP, a drying climate combined with human uses of fire likely resulted in increases in the extent of xeric scrub vegetation.
The Aljojuca record also documents important landscape changes during the historic period cal yr. BP-present likely related to the introduction of invasive species and agricultural intensification. The Aljojuca record provides a unique perspective on human-environment relationships and highlights differences between landscape transformations in the pre- and post-Conquest periods. Cultural implications of late Holocene climate change in the Cuenca Oriental, Mexico. There is currently no consensus on the importance of climate change in Mesoamerican prehistory. Some invoke drought as a causal factor in major cultural transitions, including the abandonment of many sites at CE, while others conclude that cultural factors were more important.
This lack of agreement reflects the fact that the history of climate change in many regions of Mesoamerica is poorly understood. We present paleolimnological evidence suggesting that climate change was important in the abandonment of Cantona between CE and CE. At its peak, Cantona was one of the largest cities in pre-Columbian Mesoamerica, with a population of 90, inhabitants. The site is located in the Cuenca Oriental, a semiarid basin east of Mexico City.
We developed a subcentennial reconstruction of regional climate from a nearby maar lake, Aljojuca.
adreserco.tk The modern climatology of the region suggests that sediments record changes in summer monsoonal precipitation. Comparison of this record to Cantona's chronology suggests that both the city's peak population and its abandonment occurred during this arid period. The human response to climate change most likely resulted from the interplay of environmental and political factors. During earlier periods of Cantona's history, increasing aridity and political unrest may have actually increased the city's importance.
However, by CE, this extended arid period, possibly combined with regional political change, contributed to the city's abandonment. Health-related quality of life, obesity, and fitness in schoolchildren: the Cuenca study. The purpose of this study was to analyze the association of weight status and physical fitness with health-related quality of life HRQoL and to examine the independent association of body mass index BMI , cardiorespiratory fitness CRF and musculoskeletal fitness MF with HRQoL in schoolchildren.
The mean in self-perception dimensions was lower in obese girls compared to normal weight or overweight girls. Improving fitness could be a strategy of particular interest for improving the HRQoL of schoolchildren. Random sampling was used. The questionnaire was administered by standardized health workers. Subjects were visited house by house.
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A total of subjects participated, with an average age of The prevalence of knee osteoarthritis was 7. MSK pain prevalence was high. Osteoarthritis and low back pain were the most common diseases. Age, sex, physical activity, repetitive tasks, living in a rural area, and lack of health-care coverage were found to be associated with MSK pain. Lynn; Zimmerman, Susan. The relationship between socioeconomic status and beverage consumption in children: The Cuenca Study.
Some authors have suggested that consumption of caloric beverages is higher in children with a low socioeconomic position because families limit their spending on healthy food in order to save money. Data for parental socioeconomic status were gathered by using self-reported occupation and education questions answered by parents and classified according to the scale proposed by the Spanish Society of Epidemiology. Regarding other beverages categories, middle-status children had higher consumption levels.
In contrast, lower status children drank more fruit juices and skimmed milk. All of these do not show statistically significant differences. In fact, intake for most beverage categories was higher in middle-status children than in both other socioeconomic groups. Future research is needed in order to identify this complex relation between socioeconomic inequality and beverage intake behavior.
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