The Rogart and Strontian high Ba–Sr plutons (Northern Highlands, Scotland) comprise a range of lithologies from felsic to ultramafic rocks. latter are mantle-derived their differentiation produce the components is result fractional crystallization variable assimilation surrounding Moine metasediments. New results presented here demonstrate that accessory mineral chemistry can provide further insight into petrogenesis highlight petrological potential apatite titanite. main minerals titanite,...

Apatite is an excellent tracer of petrogenetic processes as it can incorporate a large range elements that are sensitive to melt evolution (LREE-MREE, Sr, Pb, Mn, halogens, Nd isotopes). Recent advances in the understanding trace element concentrations and isotope ratios apatite provide novel tool investigate magmatic petrogenesis sediment provenance. experimental work has better characterized partition coefficients for apatite, which changes magma composition (e.g., SiO2 aluminum saturation...

Archean rocks of the tonalite-trondhjemite-granodiorite (TTG) suite are dominant constituents Earth’s earliest preserved silicic crust, while conversely rare in Phanerozoic continental crust. Their formation represents first critical step towards construction and preservation continents. Formation most TTG magmas involved partial melting hydrous, probably silicified, mafic at various depths (20–50 km, possibly up to 100 km). Many possible tectonic scenarios fit petrological geochemical...

Apatite has recently gained considerable attention as a mineral with many uses within the Earth and planetary sciences. chemistry given new insight into wide range of geological processes tools, for example, magmatism, metasomatism, geochemistry, geochronology. We expand utility apatite here by presenting novel way to fingerprint magma petrogenesis using inclusions robust titanite zircon. present trace element data from shielded magmatic zircon titanite. Importantly, inclusion host...

Underexplored accessory minerals such as titanite and apatite have the potential to give insights into nature petrogenesis of their host rock.Their trace element REE-rich compositions carry a record crystallisation history chemical characteristics source.Moreover, and, certain extent, are resistant erosion during sedimentary cycles which makes them ideal reconstruct long-eroded continental landmasses.Here we report new data on from granitoids different Archean cratons comparative...

Monazite is a common accessory mineral in various metamorphic and magmatic rocks, widely used for U-Pb geochronology. However, linking monazite ages with the PT evolution of rock not always straightforward. We investigated behaviour metasedimentary sequence ranging from greenschist facies phyllites into upper amphibolites anatectic gneisses, which exposed Eocene Chugach Metamorphic Complex southern Alaska. textures, chemical compositions dates grains samples differing bulk composition grade,...

Oxygen isotope analysis of zircon, often combined with geochronology and Hf analysis, has been pivotal in understanding the evolution continental crust. In this contribution, we expand use underexplored accessory phases (titanite apatite) by demonstrating that their oxygen systems can be robust, developing geochemical indicators involving O isotopes trace element concentrations to better constrain magma petrogenesis. These minerals have advantage over zircon being present less evolved magmas...

Secular trends in plutonic whole-rock geochemistry pose critical, although non-unique, constraints to early Earth tectonics. Here, we present a large geochemical (879 collated samples) dataset for granitoids from the Pilbara Craton, Western Australia, applying it test link between secular and proposed tectonic mechanisms. We show that spatio-temporal distribution of granitoid trace element is constrained within discrete lithotectonic blocks supporting reconstruction its tectonomagmatic...

This study documents the structural and metamorphic evolution of middle to lower crust along an oblique convergent curved continental margin during a time span ∼60 Myr. Our importance variable obliquity convergence which led development overprinting fabrics distinct exhumation histories strike margin. We present analyses, 40 Ar/ 39 Ar, Rb/Sr, zircon fission track ages from exposed southern Alaskan in Chugach Metamorphic Complex. Together with history additional geochronology literature we...

We present sensitive high-resolution ion microprobe (SHRIMP) U-Pb geochronology and trace-element chemistry of zircons from the Chugach metamorphic complex, southern Alaska, which allow us to precisely constrain age duration peak metamorphism. Zircons separated migmatitic metasedimentary gneisses show thin (5–30 μm) overgrowths with compositions indicating growth at or close peak. Five ages such two magmatic plutons intruding metasediments western central parts complex range between 54.0 ±...

The ability to accurately constrain the secular record of high- and ultra-high pressure metamorphism on Earth is potentially hampered as these rocks are metastable prone retrogression, particularly during exhumation. Rutile among most widespread best preserved minerals in a hitherto untested approach use mineral inclusions within rutile such conditions. In this study, rutiles from three different ultrahigh-pressure massifs have been investigated for inclusions. shown contain high-pressure...

Abstract A novel way to investigate the petrogenesis of ancient polymetamorphosed terranes is study zircon‐hosted mineral inclusions, which are sensitive melt evolution such as apatite. Recent contributions on inclusions in unmetamorphosed granitoids can provide valuable petrogenetic information and, turn, represent a circumvent effects metamorphism. Yet impact metamorphism apatite inclusion has never been studied detail. To address issue chemical and isotopic preservation primary signals...

Abstract Rutile, titanite, and ilmenite are the most common Ti-bearing minerals in metamorphic rocks. Experimental constraints have shown that titanite is stable at low-grade conditions, rutile high pressure (HP), temperature, low (HT-LP) conditions. Yet, petrological evidence suggests can also be HP (LT-HP). This implies both used to develop proxies track metamorphism, which interesting applications. In this study, we investigated natural occurrence chemistry of gabbroic rocks basalts...

The ancient cores of modern continents, cratons, are the oldest blocks "stable" lithosphere on Earth. Their long-term survival relies resistance their underlying thick, strong, and buoyant mantle keels to subsequent recycling. However, effect substantial geographical variations in keel thickness post-assembly behaviour mass movement within these continental remains unknown. Here, we demonstrate that spatial distribution fluid-reset in-situ Rb-Sr ages for Paleo-Mesoarchean (3.6–2.8 billion...

A 600 km long metabasite belt is exposed at the southern border of Chugach terrane in Alaska, south Eocene Metamorphic Complex (CMC). In this contribution, we present petrologic and geochemical results for parts belt. The metabasites studied are amphibolite grade their PT conditions evaluated with hornblende–plagioclase thermometry average method. From west to east peak metamorphic calculated are: about 730–793 °C pressures between 5 15 kbar westernmost part, 740–760 middle locality 640–675...

Abstract The chemical exchange between the atmosphere, crust and mantle depends on sediment recycling via subduction. However, it remains unclear how atmospherically modified may affect oxygen fugacity through time. Great Oxidation Event, among most important atmospheric changes Earth, offers an opportunity to investigate in magmatism related surface–mantle interactions. Here we use sulfur K-edge micro X-ray absorption near-edge structure spectroscopy measure relative abundances of S 6+ , 4+...

Recent advancements in situ analytical techniques have generated new interest measuring strontium (Sr) isotopes rock-forming apatite and inclusions zircon, because they can bring insights into the primary signatures of magmatic sources. This paper introduces a novel approach based on laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS), which allows to achieve higher precision analysis Sr small volumes samples. The use 1013 Ω current amplifiers for...

Meta-igneous lithologies of the Cullivoe inlier in NE Yell, Shetland, have tonalite–trondhjemite–granodiorite (TTG) chemistry and yield U–Pb zircon crystallization ages c. 2856 – 2699 Ma. Formation was coeval with protoliths Lewisian Gneiss Complex time major Neoarchaean crustal growth North Atlantic Craton. The adjacent metasedimentary Yell Sound Group accumulated between 1019 941 were metamorphosed at 944 931 Ma, former preserving granulite-facies mineral assemblages inferred to be this...