Pulverized limonite ore from a Pleistocene–Quaternary lake deposit and compact limonite ore from the Olistostrome member of the Javorik fl ysch formation, in the Southern Tomašica iron ore deposit, were investigated and compared with different types of siderite and ankerite, limestone and carbonate shale from the same location in order to determine their possible protolith. Two limonite types d...

U-Pb dating of zircon was undertaken with the Beijing SHRIMP II (sensitive high resolution ion microprobe) on anamphibolite facies granodiorite and an almandine-albite granulite from the Santa Maria Chico Granulitic Complex, southern Brazilian Shield. This work was also done to unravel protolith ages which are often hidden in the array of partly reset data. The obtained metamorphic ages of the ...

Cratonic mantle eclogite xenoliths occur with diamond-bearing kimberlite. The modes and mineral compositions of eclogite contain important information on their origin, physical-chemical conditions of formation, and their geophysical properties. We have used the pseudosection option of the program PERPLEX to explore how mineral assemblage, abundance, and composition vary with bulk composition, t...

Application of mineral chemistry in determination protolith and thermobarometry the Sartip Abad metamorphic rocks (Qorveh-Kurdistan Province)

The Open University's repository of research publications and other research outputs Late Cretaceous (81Ma) high-temperature metamorphism in the southeastern Lhasa terrane: implication for the Neo-Tethys ocean ridge subduction. (2013). Late Cretaceous (81Ma) high-temperature metamorphism in the southeastern Lhasa terrane: implication for the Neo-Tethys ocean ridge subduction. Tectonophysics, 60...

CONSTRAINING THE TIMING OF ALTERATION AND CHARACTER OF THE PROTOLITH J.A. Berger, M.E. Schmidt, R. Gellert, J.L. Campbell, N.I. Boyd, B.E. Elliott, M.R. Fisk, P.L. King, D.W. Ming, G.M. Perrett, L.M. Thompson, S.J. VanBommel, A. Yen. Western University, London, ON, CAN, [email protected]; Brock University, St. Catharines, ON, CAN; University of Guelph, Guelph, ON, CAN; University of New Br...

We conducted a modified Bureau Commun Reference (BCR) sequential extraction on a basaltic soil (phono-tephrite) from Mt. Meru in Northern Tanzania in order to determine the relative contribution of water soluble, carbonate and exchangeable, oxide and organic fractions to the bulk composition of the soil. Elemental compositions were determined by ICP-MS and corrected for loss on ignition. Relati...

The age and origin of the quartz-amphibole-pyroxene (qap) gneiss from the island of Akilia, southern West Greenland, have been the subject of intense debate since the light C-isotope composition of graphite inclusions in apatite was interpreted to indicate the presence of Earth's earliest biological activity. Although this claim for biogenic relicts has been vigorously challenged, the possibili...