Results 71 to 80 of about 4,827,389 (178)

Experimental evidence for the preservation of U-Pb isotope ratios in mantle-recycled crustal zircon grains

Scientific Reports, 2018
Zircon of crustal origin found in mantle-derived rocks is of great interest because of the information it may provide about crust recycling and mantle dynamics.
Fernando Bea, Pilar Montero, Jose Francisco Molina Palma   +2 more
doaj   +1 more source

Metamorphic or Igneous Zircon? Classification Through Rare Earth Elements, Machine Learning and Logistic Regression

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Zircon is a common, highly refractory accessory mineral found in sedimentary, igneous and metamorphic rocks that forms through various processes (e.g., magmatic, hydrothermal, metamorphic growth and recrystallization). Trace element compositions of detrital zircon have been widely applied to understanding tectonic processes and continental ...
Jarrod M. Burges, Chris Yakymchuk, Michael P. DiMaio, Timothy C. C. Lui, Anirudh Prabhu, Shaunna M. Morrison   +5 more
wiley   +1 more source

Assessment of impact of a control die on marginal fidelity of milled zirconia crown copings for finishing and polishing

Journal of Prosthodontics, EarlyView.
Abstract Purpose This study evaluated and compared the marginal fidelity of milled zirconia copings before and after finishing and polishing with and without a control die. Materials and Methods This prospective multicenter in vitro trial involved two methods regularly used in two clinics for hybrid and full‐digital workflows.
Marwan Al Akkad, John Sorensen, Omar Hamadah, Iva Voborna, Marek Matoušek, Radek Mounajjed   +5 more
wiley   +1 more source

New Techniques Applied to the U-Pb Method at the Centre for Geochronological Research of the University of São Paulo: Chemical Digestions, TIMS Mass Spectrometry and Examples of Integrated Application of SHRIMP [PDF]

Geologia USP. Série Científica, 2008
The present work describes new techniques of U-Pb ID-TIMS developed at the CPGeo-IGc/USP. Techniques of partial and total chemical digestions, U and Pb concentration using anion exchange in a micro column, and the utilization of a 205Pb spike are ...
Cláudia Regina Passarelli, Walter Maurício Sproesser, Oswaldo Siga Júnior, Miguel Angelo Stipp Basei, Kei Sato   +4 more
doaj  

Zircon micro-inclusions as an obstacle for in situ garnet U–Pb geochronology: an example from the As Sifah eclogite locality, Oman [PDF]

Geochronology
Garnet is commonly used to calculate pressure (P)–temperature (T) histories of metamorphic rocks, as well as to monitor changes in bulk-rock composition (X) and deformation (d).
J. B. Walters, J. B. Walters, J. B. Walters, J. M. Garber, A. Beranoaguirre, A. Beranoaguirre, L. J. Millonig, L. J. Millonig, A. Gerdes, A. Gerdes, T. Grützner, T. Grützner, H. R. Marschall, H. R. Marschall   +13 more
doaj   +1 more source

Surface roughness, stainability, and translucency of an additively manufactured interim resin reinforced with a commercially available ceramic composite concentrate after coffee thermal cycling

Journal of Prosthodontics, EarlyView.
Abstract Purpose To compare the surface roughness (Ra), stainability, and translucency of a ceramic composite concentrate‐reinforced interim resin with its corresponding non‐reinforced formulation and with a ceramic‐filled resin indicated for definitive use after coffee thermal cycling.
Mustafa Borga Donmez, Nicolas Michel Rotter, Gabriela Panca Sabatini, Almira Ada Diken Türksayar, Hyung‐In Yoon, Burak Yilmaz   +5 more
wiley   +1 more source

A database of detrital zircon U–Pb geochronology and Hf isotopes from the Songpan–Ganzi and Western Qinling terranes

Geoscience Data Journal
Since the advent of detrital geochronology, significant progress has been made in the study of sedimentary sources. The detrital zircon U–Pb age spectrum, especially when combined with zircon Hf isotopes, provides a powerful tool for determining the ...
Yingdi Pan, Xiumian Hu
doaj   +1 more source

Data on recovery rates and external morphologies of zircon grains from mechanical and electrical pulverization of rock samples

Data in Brief, 2018
In this data article, we provide information on the recovery rate and scanning electron microscope (SEM) images of the external morphology of zircon grains separated from two rock samples (AS3 and TEMORA 2) using both mechanical and electrical ...
Mami Takehara, Kenji Horie, Tomokazu Hokada, Shoichi Kiyokawa   +3 more
doaj   +1 more source

Adjustment of CAD–CAM crowns with and without a 3D‐printed model: Comparative study of marginal fit

Journal of Prosthodontics, EarlyView.
Abstract Purpose This study evaluated and compared the marginal fit of CAD–CAM zirconia crown copings with and without a 3D‐printed control model. Materials and Methods This prospective in vitro trial involved 30 zirconia crown copings made from the same STL file. These were divided into two groups.
Marwan Al Akkad, Bedirhan Savas Yigit, Iva Voborna, Vaclav Prokupek, Oluwafunmibi Fasanya, Thomas Salinas, Radek Mounajjed   +6 more
wiley   +1 more source