Las rocas ultramáficas alcalinas del Jable de Las Salinas, Fuerteventura, Islas Canarias

En este trabajo se aborda el estudio geológico, petrológico y geoquímico de las rocas que forman el núcleo de un complejo ultramáfico-carbonatítico que aflora a lo largo de la costa del Jable de Salinas en el Macizo de Amanay (Fuerteventura, Islas Canarias). Este complejo, de naturaleza subvoIcánica, se emplazó imbricándose con los episodios intrusivos de las mallas filonianas características de los Complejos Basales canarios. Está atravesado por un denso "net- work" de naturaleza feldespática y en determinadas zonas carbonatíticas y rocas ya relacionadas con procesos de fenitización, fundamentalmente flogopitizaciones. Las rocas ultramáficas a cuyo estudio está dedicado este trabajo están compuestas casi exclusivamente por salita, kaersutita y grandes proporciones de apatito y minerales opacos, con total ausencia de olivino, feldespatos y feldespatoides. Geoquímicamente, destacan por su carácter fuertemente subsaturado: porcentajes muy bajos de Si02 y altos contenidos de Fe total, Ti02 y P20S. Sus características texturales, mineralógicas y químicas sugieren que han sido originadas por inmjscibilidad líquida

Intercellular Trafficking of Gold Nanostars in Uveal Melanoma Cells for Plasmonic Photothermal Therapy

Efficient plasmonic photothermal therapies (PPTTs) using non-harmful pulse laser irradiation at the near-infrared (NIR) are a highly sought goal in nanomedicine. These therapies rely on the use of plasmonic nanostructures to kill cancer cells while minimizing the applied laser power density. Cancer cells have an unsettled capacity to uptake, retain, release, and re-uptake gold nanoparticles, thus offering enormous versatility for research. In this work, we have studied such cell capabilities for nanoparticle trafficking and its impact on the effect of photothermal treatments. As our model system, we chose uveal (eye) melanoma cells, since laser-assisted eye surgery is routinely used to treat glaucoma and cataracts, or vision correction in refractive surgery. As nanostructure, we selected gold nanostars (Au NSs) due to their high photothermal efficiency at the near-infrared (NIR) region of the electromagnetic spectrum. We first investigated the photothermal effect on the basis of the dilution of Au NSs induced by cell division. Using this approach, we obtained high PPTT efficiency after several cell division cycles at an initial low Au NS concentration (pM regime). Subsequently, we evaluated the photothermal effect on account of cell division upon mixing Au NS-loaded and non-loaded cells. Upon such mixing, we observed trafficking of Au NSs between loaded and non-loaded cells, thus achieving effective PPTT after several division cycles under low irradiation conditions (below the maximum permissible exposure threshold of skin). Our study reveals the ability of uveal melanoma cells to release and re-uptake Au NSs that maintain their plasmonic photothermal properties throughout several cell division cycles and re-uptake. This approach may be readily extrapolated to real tissue and even to treat in situ the eye tumor itself. We believe that our method can potentially be used as co-therapy to disperse plasmonic gold nanostructures across affected tissues, thus increasing the effectiveness of classic PPTT

CMS physics technical design report : Addendum on high density QCD with heavy ions

Peer reviewe

Mineralogical features oía pyrophanite sóvite from Pta. del Peñón Blanco, Fuerteventura

A carbonite vein composed by caldte and pyrophanite is described. Pyrophanite, a very unusual mineral phase in this kind of rocks is formed at low temperatures. This vein is classified as a late carbonatit

Synchysite in the carbonatites of Pta. del Peñón Blanco, Fuerteventura, Canary Islands

Synchisite, a REE-fluorcarbonate appears in a carbonatitic vein located in Pta del Peñon Blanco, Fuerteventura. This minera/ is interpreted as the result of the action of carbonated water over REE-fluorapatit

Geochemical features of the carbonatites of Pta. del Peñón Blanco, Fuerteventura. Canary Islands

In this paper the main geochemical characteristics of the carbonatites located at Pta. del Peñón Blanco are described. They are calcite carbonatites with typical high concentrations of Sr, Ba and REE Some of them show a small positive Eu anomal

Ductile shear zones in the Fuerteventura Basal Complex

The oldest plutonic rocks of the Basal Complex of the Fuerteventura Island In the area of Amanay are an alkaline ultramafic-carbonatite complex. In certain areas these rocks are affected by two ductile shear systems with respectively general NW-SE and NE-SW orientations. The deformation related to these shear zones originate, in certain instances, a marked mylonitic foliation and the formation of folds that change notabily the structures and textures of the affected rocks. The geometric relation that exist between these structures and the location of the gravimetric and magnetic anomalies of the Island, its oceanic counterpart as well as the morphology of the sedimentary basins located to the N and NW, may point to the existence of Important oceanic fractures in this sector of the North Atlantic

Oxygen isotope thermometry in carbonatites, Fuerteventura, Canary Islands, Spain

Crystallization temperatures of the oceanic carbonatites of Fuerteventura, Canary Islands, have been determined from oxygen isotope fractionations between calcite, silicate minerals (feldspar, pyroxene, biotite, and zircon) and magnetite. The measured fractionations have been interpreted in the light of late stage interactions with meteoric and/or magmatic water. Cathodoluminescence characteristics were investigated for the carbonatite minerals in order to determine the extent of alteration and to select unaltered samples. Oxygen isotope fractionations of minerals of unaltered samples yield crystallization temperatures between 450 and 960degreesC (average 710degreesC). The highest temperature is obtained from pyroxene-calcite pairs. The above range is in agreement with other carbonatite thermometric Studies. This is the first study that provides oxygen isotope data coupled with a CL study on carbonatite-related zircon. The CL pictures revealed that the zircon is broken and altered in the carbonatites and in associated syenites. Regarding geological field evidences of syenite-carbonatite relationship and the close agreement of published zircon U/Pb and whole rock and biotite K/Ar and Ar-Ar age data, the most probable process is early zircon crystallization from the syenite magma and late-stage reworking during magma evolution and carbonatite segregation. The oxygen isotope fractionations between zircon and other carbonatite minerals (calcite and pyroxene) support the assumption that the zircon would correspond to the early crystallization of syenite-carbonatite magmas

Crustal contamination of carbonates indicated by 34S-13C correlations

No abstract available