2012年8月15日 · Podiform chromite deposits are small magmatic chromite bodies formed in the ultramafic section of an ophiolite complex in the oceanic crust. These deposits have been found in midoceanic ridge, off-ridge, and suprasubduction tectonic settings.

2022年7月30日 · The presence of PGM associated with the podiform chromitites in the Jurassic–Cretaceous ophiolite of Sebuku Island (South Kalimantan, Indonesia) is reported for the first time. Two types of chromitite have been recognized; one with high-Cr composition (Cr/(Cr + Al) > 0.7) occurs in the deep mantle, the other, high-Al (Cr/(Cr + Al) < 0.6), is ...

Podiform chromite deposits are an important source for chromite, which is the only ore for chromium, and they are the primary source for both high-chromium, low-aluminum

2021年12月1日 · Podiform chromitites occur as pod-like bodies within mantle harzburgites within ophiolites and generally have dunite envelopes of variable thickness. Early studies suggested that podiform chromitites form via fractional crystallization and mechanical separation within long and narrow magma chambers or within magma conduits ( Dickey, 1975 , Lago ...

Podiform chromitites commonly occur as irregular pod-like bodies, ranging from pea-size nodules to large bodies hundreds of meters in extent, with/without dunitic envelopes hosted by peridotites in mobile Phanerozoic orogenic belts (e.g., the Kempirsai massif in Kazakhstan, the Guleman massif in Turkey, the Zambales massif in Philippines, the ...

2004年8月16日 · Podiform chromitite deposits form as a result of the interaction of fluid-rich, percolating melts with surrounding mantle peridotites. Osmium, Ir, Ru and Cr concentrations decrease systematically from harzburgite to dunite surrounding the deposits. In addition, dunites and chromites have complementary PGE distribution patterns.

1997年4月6日 · A moderately refractory harzburgite, which has chromian spinel with an intermediate Cr # (=Cr/[Cr + All atomic ratio), around 0.5, is the most suitable host for large-scale podiform chromitites.

Location and characteristics of 1,124 individual podiform chromite mineral deposits, with grade and tonnage models for chromium as well as several related elements.

2012年1月1日 · Podiform chromite deposits are an important source for chromite, which is the only ore for chromium, and they are the primary source for both high-chromium, lowluminum ore, used in metallurgical...

1997年1月1日 · Podiform or alpinetype chromitites are almost exclusively set within the mantle section and/or the mantle-crust transition zone of ophiolitic complexes or their dismembered equivalents. They take the shape of pods or sheaths with a dunite envelope (e.g. Thayer 1964), and sometimes cut the structure of the surrounding mantle peridotites (e.g ...