Abstract Detrital chromites are commonly reported within Archean metasedimentary rocks, but have thus far garnered little attention for use in provenance studies. Systematic variations of Cr–Fe spinel mineral chemistry with changing tectonic setting resulted the extensive chromite as a petrogenetic indicator, and so detrital represent good candidates to investigate petrogenesis eroded mafic ult...

Abstract Shear zones are of localized high strain accommodating differential motion in the lithosphere and impacting crustal rheology deformational history orogenic belts. Although terrane bounding shear widely studied, intraterrane their tectonic significance, especially association with supercontinent assembly, is a largely unexplored topic. The Ribeira Belt (SE Brazil), Neoproterozoic-Cambri...

The N/NNE-striking Aravalli Delhi Fold Belt (ADFB) and the E-striking Central Indian Tectonic Zone (CITZ) converge at Godhra-Chhota Udepur (GC) sector, west-central India. Analyses of mesoscale deformation structures metamorphic phase equilibria in basement supracrustal rocks are integrated with geochronological-geochemical data (accompanying article) to address dynamics Early Neoproterozoic CI...

The extrusion tectonic model for the southeastern margin of Himalayan orogeny links crustal shear activity along Red River Shear Zone (RRSZ) to opening South China Sea (SCS). Day Nui Con Voi (DNCV) metamorphic massif in northern Vietnam strikes NW-SE, is bounded by RRSZ south and continues strike where it meets SCS. DNCV thus a critical area document thermotectonic history order advance our und...

Dating low-grade metamorphism is challenging since such rocks commonly lack suitable target minerals for acquiring pressure–temperature–time–deformation (P–T–t–d) data. Herein a new geochronological method termed ‘bulk inclusion dating’ applied to chloritoid-bearing schist from the Staufen-Höllengebirge Nappe (SHN, Austroalpine Unit, Eastern Alps, Austria) which Cretaceous imprecisely constrain...

The eastern part of the Adelaide Geosyncline contains well preserved glaciomarine sequences of the Sturtian glaciation (:750–700 Ma) including calcareous or dolomitic siltstone, manganiferous siltstone, dolostone and diamictite units and the associated Braemar ironstone facies. The ironstone facies occurs as matrix to diamictites and as massive to laminated ironstones and comprises abundant Fe ...

The 1.85 Ga paleosol at Flin Flon, Manitoba, Canada, was one of the first paleoweathering profiles taken as evidence for a dramatic rise in the oxygen content of the Paleoproterozoic atmosphere. Diagenesis and greenschist-facies metamorphism have modified the abundances of some major elements (e.g., K and Fe) in the Flin Flon paleosol. Inductively coupled plasma-mass spectrometry (ICP-MS) analy...

Monazites from high-grade metapelitic paragneisses from the southern Eastern Desert of Egypt (Abu Swayel area) were analysed with the electron microprobe mainly in an attempt to broadly constrain the metamorphic ages of the rocks by means of chemical Th(U)-Pb dating. Two samples were investigated, one showed weak signs of a greenschist facies overprint, the other one did not. For each sample, w...

Mounting evidence suggests that partial disequilibrium—meaning disequilibrium for some elements, but not for others—may be a common but rarely detected phenomenon during metamorphic mineral growth, even in ordinary prograde reactions that progress to completion. Detailed examination of compositional variations in garnet crystals over a range of metamorphic grade suggests distinctly different sc...

The Chenaillet ophiolite, South of Montgenèvre (France), represents a preserved portion the alpine ocean. gabbros form lenticular bodies 50 to 200 m thick and few hundreds meters wide. They are intrusive in serpentinites often overlain by pillow-lavas. Plagiogranite/albitite veins rare volumetrically negligible. petrology gabbro s.s. show great details progressive cooling massif, clinopyroxene ...