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Domenico Miriello Marco Malagodi Silvestro Antonio Ruffolo Mauro Francesco La Russa Gino Mirocle Crisci Antonino Pezzino Rita Galluccio Donatella Barca Elisa Marasco 《Environmental Earth Sciences》2010,60(4):829-836
The monumental tomb of Jefferson Page, an officer in the American Navy, was built in 1899 and is located in the Non-Catholic
Cemetery of Rome (Italy). This study presents complementary diagnostic studies characterizing the stone of the tomb and the
weathering and decay phenomena it has undergone. The monument is made of a single type of whitish marble, variously veined
and often covered with black patinas. Petrographic, isotopic and LA-ICP-MS analyses attribute the marble to the Carrara district.
SEM/EDS and microbiological analyses indicate that the black patinas are due to cyanobacterial autotrophic and fungin heterotrophic
colonization. Fourier-transform infrared spectroscopy revealed the presence of organic material on some portions of the tomb,
due to undocumented restoration carried out with a mixture of marble powder and a polyester resin. 相似文献
34.
We present the calculation of the probability production of an electron–positron pair in the presence of a strong magnetic field with time-varying strength. The calculation takes into account the presence of a strong, constant and uniform gravitational field in the same direction of the magnetic field. The results show that the presence of the gravitational field in general enhances very much the production of pairs. In particular, high-energy pairs are more likely produced in the presence of the gravitational field than in Minkowski spacetime. 相似文献
35.
Peter Appel Rosolino Cirrincione Patrizia Fiannacca Antonino Pezzino 《International Journal of Earth Sciences》2011,100(1):107-123
In situ monazite microprobe dating has been performed, for the first time, on trondhjemite and amphibolite facies metasediments
from the Peloritani Mountains in order to obtain information about the age of metamorphism and intrusive magmatism within
this still poorly known sector of the Hercynian Belt. All samples show single-stage monazite growth of Hercynian age. One
migmatite and one biotitic paragneiss yielded monazite ages of 311 ± 4 and 298 ± 6 Ma, respectively. These ages fit with previous
age determinations in similar rocks from southern Calabria, indicating a thermal metamorphic peak at about 300 Ma, at the
same time as widespread granitoid magmatism. The older of the two ages might represent a slightly earlier event, possibly
associated with the emplacement of an adjacent trondhjemite pluton, previously dated by SHRIMP at 314 Ma. No evidence for
pre-Hercynian events and only a little indication for some monazite crystallization starting from ca. 360 Ma were obtained
from monazite dating of the metasediments, suggesting either a single-stage metamorphic evolution or a significant resetting
of the monazite isotope system during the main Hercynian event (ca. 300 Ma). Rare monazite from a trondhjemite sample yields
evidence for a late-Hercynian age of about 275 Ma. This age is interpreted as representing a post-magmatic stage of metasomatic
monazite crystallization, which significantly postdates the emplacement of the original magmatic body. 相似文献
36.
G. Strazzulla B. Nisini G. Leto M.E. Palumbo P. Saraceno 《Astrophysics and Space Science》1997,255(1-2):67-68
In this paper we present a comparison of the observed absorption band at about 660 cm-1 (15.1 μm) toward NGC7538 IRS1 attributed
to the bending mode of solid CO2 with laboratory spectra of ion irradiated mixtures.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
37.
Experimental results on the interaction between fast bombarding ions and solid targets simulating satellite surfaces in the Outer Solar System are reviewed. Applications to Jovian, Saturnian, Uranian, Neptunian, and Plutonian systems suggest the important role played by cosmic and magnetospheric ions in eroding material, in redistributing it on the surfaces of some objects, and in producing either thin or thick mantles of dark organics. 相似文献
38.
Patrizia Fiannacca Ian S. Williams Rosolino Cirrincione Antonino Pezzino 《Gondwana Research》2013,23(2):782-796
The medium- to high-grade polymetamorphic basement rocks of the Peloritani Mountains, northern Sicily, include large volumes of augen gneiss of controversial age and origin. By means of a geochemical and SHRIMP zircon study of representative samples, the emplacement age of the original granitoid protoliths of the augen gneisses and the most likely processes and sources involved in that granitoid magmatism have been determined. U–Pb dating of three samples from widely spaced localities in the Peloritani Mountains yielded igneous protolith ages of 565 ± 5, 545 ± 4 and 545 ± 4 Ma, respectively. These late Ediacaran/early Cambrian ages are much older than was previously assumed on geological grounds, and are typical of the peri-Gondwanan terranes involved in the geodynamic evolution of the northern Gondwana margin at the end of the Avalonian–Cadomian orogeny. Major and trace element compositions and Sr–Nd isotopic data, in combination with zircon inheritance age patterns, suggest that the granitoid protoliths of the Sicilian and coeval Calabrian augen gneisses were generated by different degrees of mixing between sediment- and mantle-derived magmas. The magmas forming the ca. 545 Ma inheritance-rich granitoids appear to have had a significant contribution from partial melting of paragneiss that is the dominant rock type in the medium- to high-grade Peloritanian basement. The closeness of the inferred deposition age of the greywacke protoliths of the paragneisses with the intrusion age of the granitoids indicates rapid latest Precambrian crustal recycling involving erosion, burial, metamorphism to partial melting conditions, and extensive granitoid magmatism in less than ca. 10 Ma. 相似文献
39.
Fault‐controlled dolomite bodies as palaeotectonic indicators and geofluid reservoirs: New insights from Gargano Promontory outcrops
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Andrea Rustichelli Alessandro Iannace Emanuele Tondi Claudio Di Celma Antonino Cilona Maurizio Giorgioni Mariano Parente Monica Girundo Chiara Invernizzi 《Sedimentology》2017,64(7):1871-1900
The Upper Jurassic to Lower Cretaceous platform‐slope to basinal carbonate strata cropping out in Gargano Promontory (southern Italy) are partly dolomitized. Fieldwork and laboratory analyses (petrographic, petrophysical and geochemical) allowed the characterization of the dolomite bodies with respect to their distribution within the carbonate succession, their dimensions, geometries, textural variability, chemical stability, age, porosity, genetic mechanisms and relation with tectonics. The dolomite bodies range from metres to kilometres in size, are fault‐related and fracture‐related, and probably formed during the Early Cretaceous at <500 m burial depths and temperatures <50°C. The proposed dolomitization model relies on mobilization of Early Cretaceous seawater that flowed, downward and then upward, along faults and fractures and was modified in its isotopic composition moving through Triassic and Jurassic strata that underlie the studied dolomitized succession. Despite the numerous cases reported in literature, this study demonstrates that hydrothermal and/or high‐temperature fluids are not necessarily required for fault‐controlled dolomitization. Distribution and geometries of dolomite bodies can be used for palaeotectonic reconstructions, as they partly record the characteristics (size, attitude and kinematics) of the palaeo‐faults, even if not preserved, that controlled dolomitization. In Gargano Promontory, dolomites record Early Cretaceous palaeo‐faults from metres to kilometres long, striking north‐west/south‐east to east/west and characterized by normal to strike‐slip kinematics. Dolomitization increases the matrix porosity by up to 7% and, therefore, can improve the geofluid storage capacity of tight, platform‐slope to basinal limestones. The results have a great significance for characterization of geofluid (for example, hydrocarbons) reservoirs hosted in similar dolomitized carbonate successions. Distribution, size and shapes of reservoir rocks (i.e. dolomite bodies) could be broadly predictable if the characteristics of the palaeo‐fault system present at the time of dolomitization are known. 相似文献
40.
Daily minimum and maximum air temperatures recorded in Naples (1872–1982) and in surrounding areas have been analysed in order to set up a statistical model for investigating climatic changes of extreme air temperature. We have analysed on various time-scales the mean values of minimum air temperature lower than the 10th percentile (Tmin10) and the mean values of the maximum air temperature greater than the 90th percentile (Tmax90). The results have shown for the city: (i) a significant secular trend both for yearly Tmin10 and Tmax90, mostly due to the process of urbanization, that is also responsible for (ii) the ascertained change in the character of the annual cycle, (iii) a reasonable ability to forecast winter Tmin10 and summer Tmax90 in statistical terms using a markovian model, and (iv) a significant 11-yr cycle with an amplitude of 0.5 °C directly related to solar activity which has never been succesfully determined before. 相似文献