Highly fractionated granites and related magmatic-hydrothermal ore-forming processes can be traced by elemental ratios such as Nb/Ta, K/Rb, Y/Ho, Sr/Eu, Eu/Eu*, Zr/Hf, Rb/Sr. The lanthanide “tetrad effect” parameter (TE1,3) also a useful geochemical fingerprint of highly granites. This work assesses its application an exploration vector for granite-related mineralization in the Central Iberian ...

New SHRIMP U-Pb zircon ages for the Portalegre and Alcáçovas orthogneisses document a complex pre- Variscan history for the Iberian basement in Portugal. The available geochemical and geochronological data for the Alcáçovas orthogneiss (ca. 540 Ma) tend to favor its involvement in a Cadomian orogenic event. This is consistent with the development of an active continental margin setting at the e...

The identification of geological and industrial types mineral deposits has an important theoretical applied significance for their prospecting, resource evaluation development. This problem transformed into independent branch science. It is shown by the example titanmagnetite-ilmenite type in stratified intrusions, where main useful elements are triad Fe, Ti V. geochemical, mineralogical, miner...

Previous estimates of crustal storage time of magmas at Kilauea Volcano, Hawaii, range from a few years to a few thousand years, leading to considerable uncertainty in the time scales of processes of magmatic storage and differentiation. We present a new approach for determining minimum magma residence times which involves dating phenocrysts in a magma using 226Ra^230Th disequilibria, and apply...

Late Paleozoic–early Mesozoic intrusive rocks are distributed widely along the northern margin of Qaidam Basin in Tibetan Plateau. To constrain tectonic evolution, we carried out petrological, chronological, and geochemical studies Chahannuo gabbros. LA-ICP-MS Zircon U–Pb dating yields an age 255.0 ± 0.9 Ma for gabbros, which confirms existence Indosinian tectono-magmatic activity on Basin. The...

The Dakalasu No.1 pegmatitic rare-element deposit is a representative of Be-Nb-Ta pegmatites in Altai, Xinjiang, China. Beryl the most important beryllium-carrying mineral pegmatite. To constrain concentration mechanism Be, we conducted study textural relationships and chemical compositions (major trace elements) beryl, along with microthermometry Raman spectroscopy on beryl-hosted fluid inclus...

The Ildeus mafic–ultramafic complex represents plutonic roots of a Triassic magmatic arc tectonically emplaced into the thickened uppermost crust beneath Mesozoic Stanovoy collided margin. cumulates host Ni-Co-Cu-Pt-Ag-Au sulfide-native metal-alloy mineralization produced through differentiation subduction-related primary mafic melt. This melt was sourced in metal-rich sub-arc mantle wedge hybr...

Magmatic differentiation produces positive correlations between δ49Ti and SiO2. The equilibrium Ti isotope fractionation factors of Ti-bearing minerals are essential for understanding the mechanisms driving this isotopic fractionation. We present ab initio-derived mean force constants (barium orthotitanate, potassium titanium oxide, fresnoite, diopside, geikielite, karrooite, titanite, pseudobr...

In recent years, considerable progress has been made on the study of Mo isotopes in high-temperature geological processes. However, it is still controversial whether isotope fractionation occurs during magmatic differentiation. Here we reassess effect magma differentiation using published data conjunction with our new analysis well-characterized I-type granitoids and their enclosed mafic enclav...

Late Cretaceous granitoids are developed in the eastern and western districts of Gejiu ore district, but tin deposits mainly occur reasons for difference mineralization between still controversial. Considering main factors controlling granite Sn fertility, whole-rock geochemical characteristics granites on both sides compared. LA-ICP-MS zircon U-Pb analyses yielded two age periods: early phase ...