Carbonate archives record a brief snapshot of the ambient Earth's surface conditions at their deposition. However, geologically reasonable extraction and interpretation geochemical proxy data from ancient, diagenetically altered rock is fraught with problems. Three issues stand out: dichotomy between petrographic alteration; lack quantitative age constraints for specific diagenetic phases resulting in poorly constrained admixture local, basin-wide over-regional (far-field) features; an often...

Abstract Here, we present in situ U–Pb laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) ages of andradite-grossular garnet from four magmatic-hydrothermal polymetallic skarn prospects the Schwarzenberg District, Erzgebirge (Germany), located internal zone Variscan Orogenic Belt. Within geochronological framework igneous rocks and hydrothermal mineralization Erzgebirge, obtained define three distinct episodes formation: (I) early late-collisional (338–331 Ma) recording...

This study integrates field structural data, petrographic and geochemical (δ18O, δ13C, Δ47, 87Sr/86Sr, elemental composition) analyses U–Pb dating of calcite veins cutting the Bóixols-Sant Corneli anticline (Southern Pyrenees) in order to date investigate spatio-temporal relationships between fluid flow fold evolution. E-W trending grew from Late Cretaceous Paleocene at front Bóixols thrust sheet deforming pre-growth growth sedimentary sequences. reveals late Miocene deformation ages, which...

Abstract U–Pb ages were determined by split-stream LA-SF/MC-ICPMS in garnets from UHT granulite xenoliths (Star mine, South Africa; 124 Ma). They give a considerable age range of 400 million years with well-defined maximas at 3.09, 3.01 and 2.75 Ga. The oldest peak overlaps the changeover tonalites to K-granites 3.14–3.04 Ga zircon mid-crustal granulites Vredefort dome (3.1 Ga) wake 3.2 collision three terrains that compose Witwatersrand block. Subduction (or sagduction) uppermost crust an...

We combine structural analysis of fractures with 22 U–Pb dates measured in fracture-filling carbonate cements from bed-parallel fibrous calcite veins (beef), conjugated and faults within the Vaca Muerta Formation along Andean fold thrust belt Neuquén Basin. The ages constrain accurately relationships between overpressures caused by hydrocarbon generation compression as mechanisms for natural fracturing vein formation. Two generations fibres have been identified beef. first one, consists dark...

Genetic models for granitoid formation in orogenic environments commonly entail varied mantle participation, with differentiation of mafic magmas typifying an end-member model if input dominates over crustal anatexis. By departing from this model, diverse petrogenetic processes and combination thereof could also produce weakly peraluminous compositions such domains, deriving opposite implications evolution (crustal growth vs. reworking). The interpretation may be further complicated terms or...

Abstract. Garnet is commonly used to calculate pressure (P)-temperature (T) histories of metamorphic rocks, as well monitor changes in bulk-rock composition (X) and deformation (d). In situ U-Pb geochronology by laser ablation-inductively coupled mass spectrometry (LA-ICPMS) a rapid relatively high spatial resolution technique, which can be constrain the timing P–T–X–d preserved garnet. However, low U contents (low µg/g ng/g levels) most common garnet crystals presents unique analytical...

Furtschaglschiefer is a thick layer of graphitic schists belonging to the Greiner unit in western Tauern Window. The precise tectonostratigraphic assignment these rocks debated, but they are considered post-Variscan cover Zillertal-Riffl nappe, which was metamorphosed only during Alpine orogeny.These display peculiar structure, where biotite adds garnet form porphyroblasts up 1 cm long, defining marked lineation. texturally well-equilibrated mineral assemblage comprises quartz, plagioclase,...

Mobility of S in subduction zones is complex with far reaching impacts on the formation large hydrothermal ore deposits arc environments, volcanic emissions into atmosphere potentially impacting Earth’s climate, transfer mantle via subducting slab and accompanying potential remodification budget. Sulfur flux sulfides slabs have been extensively investigated, but most studies focus HP metamorphism from zone de mélanges at mantle-crust transition, thus lacking a...

Garnet U-Pb dating by laser ablation – multicollector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) in metamorphic rocks allows constraining the main stages of tectonic thickening during orogenesis. Dates obtained from garnet generally record prograde growth or baric peak, attained stacking. This is great importance because accessory minerals, such as zircon, usually analysed date thermal peaks (or retrograde cooling) rather than metamorphism and commonly constrains...

In situ garnet U-Pb geochronology by laser ablation-inductively coupled mass spectrometry (LA-ICPMS) is a powerful tool for rapid and high-spatial resolution dating of metamorphic pressure-temperature–time histories. However, ultra-low U Pb contents in many garnets pose significant analytical challenge, including the risk contamination inclusions. Here we use split-stream analysis to simultaneously measure U, Th, isotopes trace-element from eclogite-facies metamafic rocks (As...

The specific oceanic crust architecture, magmatism, hydrothermal fluid circulation and lithologies at core complexes (OCCs) imply different S metal (e.g. Cu, Zn, Co, Ni) fluxes relative to well-structured at-fast spreading ridges. Extensive within OCCs often leads seafloor massive sulfide (SMS) deposits formation either hosted in the OCC or crustal hanging wall. source zones are nevertheless poorly constrained. study of distribution ODP Hole 735B deep drill from Atlantis bank allows...

It is well known that the density of metamorphic reactions occurring in subduction zones, due to intense fluid-melt activity, very high. One minerals resulting from all these reactions, present both downgoing slab and serpentinized mantle wedge, magnetite. Its study therefore crucial understanding geodynamic processes, as it gives information about oxidized fluids, temperature, trace elements mobility etc... applicability encompasses not only petrology (sensu lato) but also tectonic...

Saline-alkaline lakes commonly occur in semi-arid tectonically active regions, and their deposition is influenced by tectonic, surface hydrothermal processes, climate. This study explores the effects of climate fluid flow on formation saline-alkaline succession Ibar Basin, southern Serbia, using sedimentological analysis, U-Pb geochronology carbonates (via LA-ICP-MS), geochemistry, inclusion analysis.The basin’s predominantly clastic sedimentation includes alluvial fan, floodplain,...

Garnet has an extensive pressure-temperature (P–T) stability field for a wide variety of rock compositions, and its compositional changes reflect during prograde P–T evolution. The beauty garnet petrochronometry is thus the ability to extract temporal (t) information from single rock-forming mineral with relatively well-known thermodynamic properties.While still in infancy, U–Pb dating by LA–ICPMS evolving petrochronological tool vast potential...

Abstract. Recent developments in analytical capabilities the field of situ laser ablation mass spectrometry (LA-ICPMS) have expanded applications U–Pb geochronometers low-U minerals such as carbonates or garnets. The rapid evolution technique relies on well-characterized matrix-matched reference materials. In this article, we explore suitability using carbonate an “almost-matrix-matched material” for dating sulfates. For purpose, used astrochronologically dated gypsum and anhydrite samples...

Abstract Seafloor massive sulfides form in various marine hydrothermal settings, particularly within volcanic arcs, where magmatic fluids may contribute to the metal budget of system. In this study, we focus on Kolumbo volcano, a submarine edifice central Hellenic Volcanic Arc hosting an active Diffuse sulfate-sulfide chimneys Zn-Pb sulfide mineralization with elevated As, Ag, Au, Hg, Sb, and Tl contents. These elements have similar behavior during degassing are common arc-related systems....

Abstract Efficient transfer of S and chalcophile metals through the Earth’s crust in arc systems is paramount for formation large magmatic-hydrothermal ore deposits. The sulfide-volatile compound drops has been recognized as a potential key mechanism such but their fate during dynamic magmatism remains cryptic. Combining elemental mapping in-situ mineral analyzes we reconstruct evolution active Christiana-Santorini-Kolumbo volcanic field. observed are micrometric sulfide blebs associated...

Abstract Petrographic observations and in situ U–Pb ages of melilitites, foidites, basanites, phonolites, trachytes from the southern part Central European Volcanic Province (CEVP) related plutonic inclusions therein reveal two distinct age groups separated by a gap ~ 20 Myr. A late Cretaceous to early Eocene group (~ 73–47 Ma; Taunus, Lower Main plain, Odenwald Kraichgau area, Bonndorfer Graben Freiburger Bucht Vosges Pfälzerwald) is characterized nephelinites basanites mostly devoid...

Efficient transfer of S and chalcophile metals through the Earth’s crust in arc systems is paramount for formation large magmatic-hydrothermal ore deposits can strongly affect climate. The sulfide-volatile compound drops has been recognized as a potential key mechanism such but their fate during dynamic magmatism remains cryptic. We report evidence preserved active Christiana-Santorini-Kolumbo volcanic field. observed are micrometric sulfide blebs associated with vesicles trapped...