No genetic link between the two main types of chromitite, stratiform and podiform chromitites, has ever been discussed. These chromitite have very different geological contexts; one is a member layered intrusions, representing fossil magma chambers, in crust, forms pod-like bodies, conduits, upper mantle. Chromite grains contain peculiar polymineralic inclusions derived from Na-bearing hydrous ...

The detection of mineral deposits and their related geological structures is great importance to the mining industry as (such dykes faults) can affect safety, cost efficiency mining. With goal testing cost-effective seismic methods for exploration mining, active passive experiments were conducted at Maseve platinum mine in Bushveld Complex (South Africa) 2020. involved surface-passive (using 5 ...

We investigated the crystal and structural behavior of several Cr-bearing spinels from the Archean chromitites of Amsaga (Mauritania). The chemical and structural data testified a retrograde metamorphism from amphibolite to greenschist facies, witnessed by relative changes in the amount of all the major oxides (Cr, Al, Mg, Fe2+, Fe3+), the relative proportion of Fe/Fetot as well as the structur...

Layered intrusions represent part of the plumbing systems that deliver vast quantities of magma through the Earth's crust during the formation of large igneous provinces, which disrupt global ecosystems and host most of the Earth's endowment of Pt, Ni and Cr deposits. The Rustenburg Layered Suite of the enormous Bushveld Igneous Complex of South Africa has been presumed to have formed by deposi...

The deepest rocks known from within Earth are fragments of normal mantle ( approximately 400 km) and metamorphosed sediments ( approximately 350 km), both found exhumed in continental collision terranes. Here, we report fragments of a highly reduced deep mantle environment from at least 300 km, perhaps very much more, extracted from chromite of a Tibetan ophiolite. The sample consists, in part,...

Ophiolite magnesite deposits are among the main sources of magnesite, a raw material critical for EU. The present work focuses on occurrences at Kymasi (Evia Island, Greece), in close spatial association with chromitite within same peridotite massif, and relationship between ultramafic rocks late veins. Chromitite lenses hosted dunite, contact partially serpentinized cut by Close to veins, show...

In the Appalachian Mountains of Vermont, USA, variably serpentinized ultramafic rocks mark Ordovician Taconic orogenic suture zone. These provide evidence for several alteration events that occurred during orogenesis. The largest these bodies occurs as a partially meta-dunite located in East Dover, Vermont. Whole-rock X-ray fluorescence spectroscopy and electron microprobe data on samples are i...