Laser-ablation Lu-Hf dating reveals Laurentian garnet in subducted rocks from southern Australia

Nd–Hf–Sr–Pb isotopes and trace element geochemistry of Proterozoic lamproites from southern India: Subducted komatiite in the source

The probable sources of some of the famous Indian diamonds are the 1.2 Ga old Krishna lamproites of Southern India, a rare Proterozoic occurrence of lamproites which are usually Cretaceous or younger in age. In this study we report Nd, Sr, Pb and Hf isotopes and multiple trace element concentrations of the Krishna lamproites. The goals are to evaluate mantle-processes and the petrogenesis of th...

Ablation Studies of Enamel Tissue using Pulsed HF Laser

We describe studies of the interaction of ≅400ns duration, multiline (2.6-3) μm HF laser with enamel tissue. The etch rate experiment showed an ablation threshold fluence of 47 Jcm but using the dispersion theory for optical coefficients of n and k for enamel at dominant laser lines, this value reduced to ≅25 Jcm making it more comparable with other investigations. The main mechanism of enamel ...

Deep subduction of the Seve Nappe Complex in the Scandinavian Caledonides

Klonowska, I. 2017. Deep subduction of the Seve Nappe Complex in the Scandinavian Caledonides. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1595. 63 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0139-6. This thesis seeks to improve our understanding of the processes involved in continental collision zones, with a particular f...

Dating species divergences using rocks and clocks.

Study of laser ablation using nano-second laser pulses

 In this paper, the laser ablation process based on the irradiation of nanosecond pulsed lasers on a copper target surface in the presence of Helium gas is studied. The dynamical behaviors of the generated plasma in the helium gas and evaporated copper at the atmospheric pressure are examined using a laser pulse, laser wavelength of and intensity of 7×1010W/cm2. A one-dimensional thermal model ...