WebBoron isotope ratios (11B/10B) have been measured on 60 tourmaline separates from over 40 massive sulfide deposits and tourmalinites from a variety of geologic and tectonic … WebOct 3, 2024 · Tourmalinites in the Mahuri Khera area of SGMB are exposed in the form of 30–40 cm thick dark grey black bands that can be traced discontinuously for about 1 km along strike present at the contact of schist and marble and also within the marble. The chemical similarity of tourmalinite and schist with high Fe/ Al ratio, higher P

Minerals Free Full-Text The Kilmar Magnesite Deposits: …

WebSep 29, 2024 · Tourmalinites in the Mahuri Khera area of SGMB are exposed in the form of 30–40 cm thick dark grey black bands that can be traced discontinuously for about 1 km … WebStratiform tourmalinites are more widespread than previously recognized in many regional metamorphic terrains. They are especially common in Proterozoic and early Palaeozoic … ezgril

Genesis of tourmalinites from Belgium: petrographical and …

WebTrace element contents of tourmalines from massive sulfide deposits and tourmalinites have been determined in situ by proton microprobe; >390 analyses were acquired from 32 polished thin sections. Concentrations of trace elements in the tourmalines vary widely, from <40 to 3,770 ppm Mn, <4 to 1,800 ppm Ni, <2 to 1,430 ppm Cu, <9 to 4,160 ppm Zn, 3 to … WebA few tourmalinites display striking sedimentary structures such as graded bedding, cross-laminations, slump and flame structures, and rip-up clasts. These and other geologic … WebFORM TOURMALINITES In general, only pyrite and traces of chalcopyrite and scheelite were observed in the tourmalinites, although locally abundant Cu-mineralization is associated with tourmaline-bearing quartz veins. In the latter, chalcopy-rite, chalcosite and secondary Cu minerals can be seen in hand specimen, and whole-rock analyses show con- hidrida logam adalah