Kinetically induced compositional zoning in titanite: implications for accessory-phase/melt partitioning of trace elements

Article Abstract:

Sector zoning of titanites is present in a variety of Caledonian granitoids and other rocks indicating a disequilibrium partitioning of the mineral during rock formation. This means that kinetics play an important role in the growth and development of crystals. The crystal habit, as well as the changes occurring throughout the growth period, is responsible for the sector zoning pattern observed. The crystal habit, in turn, is affected by chemical disequilibrium in the granitoid titanites. This disproves the usual assumption that partitioning of trace elements is an equilibrium process.

Environmental aspects, Growth, Crystals, Crystal growth

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Evidence for inherited Sm-Nd isotopes in granitoid zircons

Article Abstract:

A study was conducted to examine evidence describing the preservation of Sm-Nd isotope component. The study sampled zircons from the Strontian granitoid in northwestern Scotland. It is shown that refractory zircons exhibit an influence on the preservation process for both Sm-Nd and U-Pb isotope components. Results also point to the presence of an inherited Sm-Nd isotope as a factor in isotopic disequilibrium. Since zircons exhibit high isotopic ratios, the evolution of Nd isotopes will vary from that of the continental crust.

Isotopes

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U-Pb zircon systematics at Gruinard Bay, northwest Scotland: implications for the early orogenic evolution of the Lewisian complex

Article Abstract:

A study was conducted to investigate orogenic evolution of the mainland Lewisian complex at the Gruindar Bay area in northwest Scotland. The area was characterized by an Achaean gneiss complex influenced by a series of Proterozoic events. Several samples representing the main lithologies at Gruinard Bay were examined. Results indicated the presence of large amounts of xenocrystic zircons and minerals pseudomorphs of pyroxene and high-titanium amphibole established in hornblende-granulate facies.

Scotland, Natural history, Titanium, Granite, Pyroxene, Biotite

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