Like most other minerals, titanite rarely if ever forms perfect crystals. In addition to the point defects that might affect lattice diffusion, there may be extended lineor planar defects along which fast diffusion could occur. During the course of an experimental study of oxygen lattice diffusion in titanite, we found that almost all of the O uptake profiles produced in natural titanite crysta...

Introduction: Numerous studies over the past decade have demonstrated that microbial life rapidly colonizes terrestrial subaqueous volcanic glass [1-5]. Evidence for microbial alteration of terrestrial subaqueous volcanic rocks has been reported from modern ocean crust, ophiolites, and Archean greenstone belts [1-5]. Microbial alteration structures with characteristic granular and tubular morph...

Titanite is an important mineral in petrochronology studies. Understanding chemical signatures of titanite from different environments can provide significant data unraveling the complex histories recorded their textures and compositions. Using a database over 8500 analyses both literature (3829) our own (4900), we found that ratio Fe/Al useful for separating igneous (Fe/Al typically close to 1...

Quantifying the timing and conditions of ductile deformation is essential for quantitative models lithospheric deformation. Yet, directly constraining these variables documenting how they change during a single event remain difficult. We present titanite microstructural, zoning, trace-element, U-Pb data from <m-scale mylonitic shear zones in Eastern Transverse Ranges, CA (Joshua Tree National P...

New empirical calibrations for the fractionation of oxygen isotopes among zircon, almandine-rich garnet, titanite, and quartz are combined with experimental values for quartz-grossular. The resulting A-coefficients (‰K) are: for the relation 1000 ln Y-X AY-X (10 /T). The fractionation of oxygen isotopes between zircon and coexisting minerals can provide otherwise unavailable evidence of magmati...

The crystal structure of durangite, ideally NaAl(AsO(4))F (chemical name sodium aluminium arsenate fluoride), has been determined previously [Kokkoros (1938). Z. Kristallogr.99, 38-49] using Weissenberg film data without reporting displacement parameters of atoms or a reliability factor. This study reports the redetermination of the structure of durangite using single-crystal X-ray diffraction ...

A detailed petrographic and mineralogical investigation of olivine-phlogopite micro-ijolite xenoliths from Oldoinyo Lengai, Tanzania indicates a complex evolutional history. These consist diverse textural subdomains characterized by minerals ranging early-formed olivine, through diopside-hosted perovskite phlogopite, to evolved aegirine-augite titanite. Thermometry mineral compositions in the s...

As a result of isotope-geochemical study, the age data (U-Pb method, ID-TIMS) titanite from first phase granites Belokurikhinsky granite massif, Gorny Altai, were obtained for time. The concordant value 255 ± 2 Ma coincides within margin error with previously published results dating micas second and third phases Belokurikha massif by Ar-Ar method (250 3 Ma). At same time, differ significantly ...

There has been controversy over the number and timing of orogenies in the Precambrian Moine block in the Scottish Caledonides since the earliest radiometric dating in the 1960s. This work challenges a recent hypothesis, that this sector of the Laurentian margin was subjected to continuous crustal extension between .900 and 470 Ma. U–Pb dating (thermal ionization mass spectrometry) of titanite f...