We explore Fe/Mn and Nb/Ta ratios of basalts as potential tracers for differentiating melts of recycled mafic crustal lithologies from peridotitic melts. Trace elements and Fe/Mn ratios of the Mesozoic and Cenozoic basalts from East China were analyzed by ICP-MS. Low Nb/Ta ratios (15.4 ± 0.3 (2r, n = 45)), high Nb and Ta contents (60.1 and 4.01 ppm) and high Fe/ Mn ratios (64.7 ± 1.5 (2r, n = 4...

Oceanic basalts, such as mid-ocean ridge basalts (MORB) and ocean island basalts (OIB), are characterized by large isotopic and trace element variability that is hard to reconcile with partial melting of a peridotitic mantle alone. Their variability has been attributed to the presence of heterogeneities within the mantle, such as recycled crust, metasomatized material or outer core contribution...

Textural, major element and trace element data for xeno-liths from Salt Lake Crater, Hawaii indicate that typical four phase lherzolite inclusions (olivine, orthopyroxene, chrome diopside and spinel) found worldwide in basalts are not samples of primitive upper mantle. Rather, lherzolite may be the recrystallized residue left after a basaltic melt extracts the easily fused components from pre-e...

Scandium is important in modern technology and regarded as a strategic metal many countries. It highly dispersed Earth’s crust rarely forms independent minerals. Clinopyroxene the most Sc-bearing mineral some world-class deposits hosted mafic–ultramafic intrusions, which are also major source of laterite-hosted Sc deposits. However, factors controlling distribution minerals have been little exp...

kuh-e-siah is located in the north of gavkhuni lagoon and east of the varzaneh (se of isfahan) and is a part of urumieh-dokhtar magmatic arc (udma). the volcanic rocks of this area are vesicular basalt and basaltic andesite with late miocene age. the most common textures of these rocks are porphyry, microlitic porphyritic, hyaloporphyric and vesicular. plagioclase, olivine and clinopyroxene are...

Abstract The origin and evolution of subcontinental lithospheric mantle (SCLM) are important issues Earth’s chemical physical evolution. Here, we report detailed textural analyses on a xenolith suite from Befang (Oku Volcanic Group, Cameroon Line), which represents major tectono-magmatic structure the African plate. samples sourced spinel-facies dominated by lherzolites. Their texture is catacl...