Pacific hurricane season - Wikipedia
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La ciudad transforma a los llegados, pero se enriquece y transforma al mismo tiempo con ellos. Respecto a esto los datos son igualmente concluyentes. Las posibilidades que ofrece la ciudad en ese sentido son siempre infinitamente mayores que las que se dan en el campo.
De manera semejante, el papel de los inmigrantes en el desarrollo de la ciudad ha sido reconocido multitud de veces. Sobre todo de las ciudades norteamericanas en general 32y respecto a algunas en particular, como Nueva York. Es el caso, por ejemplo, de Barcelona. De un total de escritores barceloneses de los siglos XVI al XIX 36los porcentajes de nacidos fuera de Barcelona ha sido los siguientes: Los grupos marginales o vencidos se situaban normalmente en lugares aparte: Como resultado de ello, los miembros de una raza tienden a pensar que son diferentes de otros grupos de personas, y los otros grupos pueden tratarlos como si realmente lo fueran.
En ese sentido puede ser un sentimiento beneficioso. Incluso puede decirse que en nuestro siglo son menores, especialmente en la ciudad industrial, debido al establecimiento del Estado de Bienestar. Aunque, naturalmente, pueden aumentar con el desmantelamiento del mismo, si se produce. En el caso de Barcelona los problemas no son especialmente graves, si comparamos con otras ciudades europeas o americanas.
La importancia creciente del conocimiento en esta sociedad hace que adquiera un papel decisivo la mano de obra calificada. En esencia, hemos de distinguir entre dos tipos de migraciones. En segundo lugar, los inmigrantes de origen extranjero. En el censo de los inscritos en el censo eran En eran ya En la cifra de oficialmente inscritos era de La paradoja es que, por un lado esos trabajadores extranjeros se siguen necesitando: O para prescindir de ellos si resulta necesario.
Que es precisamente lo que ha ocurrido con los inmigrantes: The quartz-feldespatic porphyry unit crops out in the south-central part of the RNSS, forming small hills.
Quartz and K-feldspar crystals are embedded in an aphanitic matrix. Potassium-feldspar orthoclase is commonly broken up and shows sericitic alteration. Many plagioclase crystals are zoned. Biotite grains are euhedral; most of them are fractured, corroded, oxidized and sericitized. There are small amounts of hornblende altered to epidote, chlorite and Fe-oxides.
The granite rich in quartz, aplite and pegmatite dikes unit is the kind of facies typically associated with late crystallization phases in the magma chamber. They are light gray and of fine-grained texture. The aplitic and pegmatites dikes are generally less than 1 m thick, and show no preferred orientation. More common mineralogical association in these dikes is quartz, potassium-feldspar, plagioclase, mica, and accessory tourmaline.
The Miocene volcanic and sedimentary rocks Miocene volcanic and intrusive rocks in the RNSS either unconformably overlie the Cretaceous plutons or intrude in to them. They were mapped as three compositional units: The rhyolite unit includes dikes filling sigmoidal fractures within the granodiorite-monzogranite main pluton, as well as associated domes which are coeval.
The rhyolite dikes occur mostly in the western side of the RNSS, but dikes cut the entire structure from north to south; they also occur in the central-eastern side and cut quartz feldspatic porphyry Figure 2.
The dikes form as discontinuous prominent ridges, rising tens of meters above their surroundings. The sigmoidal fracture pattern that they intrude was developed earlier or during the emplacement of the rhyolitic dikes within the granodiorite-monzogranite. The rhyolite unit also includes domes up to m in diameter.
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Generally they are pink to reddish-gray because of the presence of Fe-oxides. Dispersed across the RNSS, there are outcrops of volcanic and volcaniclastic rocks mapped as the rhyolitic tuff unit. These rocks generally occur as small remnants, filling paleo-valleys between minor ranges composed of granitoid. The largest outcrops are about 3 km2 in the east-central side of the RNSS.
The base of the volcaniclastic sequence is formed by tuffaceous breccias, which include clasts of the volcanic and granitic older units, overlain by a well-stratified volcanic sequence. The petrological characteristics of this unit suggest that it may correlate with the tuff of San Felipe. The basalt unit in the map Figure 2 is restricted, to isolated outcrops scattered along the RNSS; however, the contact with the underlying intrusions is not well exposed.
Analytical results are summarized in Appendix 2and results are summarized in Figure 4 and Table 1. An isotopic age of The age is based on the average of 11 concordant grains. The ages obtained are consistent with field relations, as the granodiorite-monzogranite is intruded by the younger granitic and subvolcanic units.
A rhyolitic feeder dike yielded a crystallization age of Structural observations The Rancho Nuevo granodiorite-monzogranite unit contains sigmoidal fractures hundreds to tens of meters long, where most of the fractures were filled by viscous rhyolite.
These fractures were clearly formed after pluton emplacement. The sigmoidal pattern of fractures and rhyolite dikes is clearly visible on satellite images of high resolution. Figure 6d shows the strike of the complete data set, with a resultant strike. The geometry of the fractures and dikes in the RNSS resembles an en-echelon, dextral-shear indicator, formed in a brittle-ductile environment. Apparently, the continuation of the Rancho Nuevo sigmoidal struture is buried by alluvial deposits south and north of the RNSS Figure 2.
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The granodiorite-monzogranite body does not display a macroscopic foliation or mineral lineation, nor ductile shear zones. Other kinematic indicators are striations in the internal faces of the factures where rhyolite dikes were emplaced. These observations combined with observations of microscopic brittle deformation and plagioclase recrystallization, suggest that deformation occurred at relatively shallow crustal levels.
Anisotropy of magnetic susceptibility Because of the scarcity of kinematic indicators and the homogeneity of the Cretaceous granitoids, we employed anisotropy of magnetic susceptibility AMS as an estimate of strain recorded by intrusive rocks of the RNSS. AMS fabric often parallels the orientation of the strain ellipsoid, but interpretation may not be straightforward. AMS fabrics are represented by an ellipsoid defined by the axis of maximum, intermediate and minimum susceptibility kmax, kint, and kmin.
The intensity of the fabric is evaluated with the percentage of anisotropy Pj parameter Table 2. AMS studies have been applied to the systematic study of plutonic rocks, which generally have relatively simple magnetic mineralogy Borradaile, ; Borradaile and Henry, The interpretation of these data, however, can be difficult because the magnetic susceptibility ellipsoid often reflects the combination of emplacement related strain due to magma flow or interaction with the host rockregional strain during emplacement, as well as solid-state deformation after emplacement.
AMS data were obtained in all 27 drilled sites. The samples were measured prior to beging demagnetized, Magnetic susceptibility for samples of the granodiorite-monzogranite are high, with the mean of the samples ranging between about 5 x and 6 x10 -2 SI units, except for sites 7 and 19 that have significantly lower values between 1 and 9 x The high susceptibility values suggest that the magnetic fabric is dominated by the ferromagnetic mineral phases Ellwood and Wenner, Despite the fact that the granodiorite-monzogranite unit does not display a visible fabric, there is a weak but well-defined magnetic fabric.
Percentage anisotropy is relatively low, with an average value of 1. The shape parameter T varies within the Rancho Nuevo sigmoidal structure.
In the northern and southern sectors of the structure, ellipsoids are dominantly prolate at six sites T ranges between Nonetheless, at rest of the sites T typically has positive values indicating ellipsoids of oblate shape. The orientation of kmax, kint and kmin is displayed in Figure 7.
The orientation of the AMS foliation in the granodiorite-monzogranite unit is generally parallel to the dike orientations, such as in sites 13 through 17 in the NE side of the sigmoid, sites 6 and 11 in the northern side, and sites 21 to 25 in the southern sector of the sigmoid Figure 7. There are, however, significant deviations with foliation planes oblique to the structure, such as sites 20 and 21, as well as 7. Paleomagnetism Samples of the granodiorite-monzogranite collected at Rancho Nuevo generally have moderately strong magnetizations, and relatively straightforward demagnetization behavior.
The NRM is typically the sum of two magnetizations. A low coercivity magnetization is removed with inductions of about 12 mT Figure 8. The directions of the low coercivity component show no prevalent within-site orientation.
A moderate-coercivity mT magnetization is defined by linear trajectories to the origin, and it is considered the characteristic magnetization ChRM. The direction of the ChRM is typically to the SW and moderately steep negative, or antipodal to this direction, but it is to the southwest and shallow at three sites in the north and the west sides of the structure and to the NW SE and moderately steep positive negative at sites 9 and 19 Figure 8Table 3.
A ChRM was identified at 16 sites, but in one of them the statistic is poor. Within-site dispersion of the ChRM is low, with precision parameter generally higher than At eleven sites no stable magnetization was observed.
In some of these sites the NRM is of very low coercivity, and directions within a site have high dispersion; in others demagnetization behavior is erratic. The ChRMin 15 sites are predominantly of reverse polarity, consistent with emplacement during C31r. The mean direction indicates clockwise rotation of It appears, however, unlikely that the RNSS rotated as a rigid body, as sites in the north and west with southwesterly and shallow ChRM indicate a combination of rotation and tilt southwardand two sites 9 and 19 do not record significant rotation.
Discussion To our knowledge, this is the first study where the deformation of intrusive rocks in the extensional province of the gulf is analyzed. The most evident indication of deformation in the RNSS is the presence of a sigmoidal structure, which later on was filled by viscous rhyolite as dikes.
The fractures may be rotated by ductile deformation either during or after formation. As gash fractures develop at different times of ductile shearing they show different amounts of rotation. This deformation coincides with the results of the paleomagnetic study.
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The AMS is a technique that defines the orientation and intensity of the magnetic fabric in the rocks. The AMS in the granodiorita-mozogranite unit of the RNSS shows that considerable changes in the orientation of the magnetic fabric exist in the rock, indicating that they record significant strain.
As mentioned above, not all sites record the same amount of rotation. For instance, sites 5 and 6 in the western side of the structure require a combination of rotation and tilt.
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