Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"baddeleyite"”.
-
The discovery of baddeleyite (ZrO2) and chrome spinel in the basal Rooiberg Group of the 2.057 Ga Bushveld Complex, South Africa: Implications for the impact and igneous scenarios for the petrogenesis of the Rooiberg Group.
… South Africa. The discovery of composite zircon-baddeleyite grains and chromite in the Basal Rhyolite demands a reassessment of proposed scenarios for its petrogenesis. These scenarios include: 1) crustal melting caused by, and differentiation of, intrusive ultramafic magmas of the 9 km thick …
-
The geochemistry and geochronology of the barby formation in the sinclair area, Southern Namibia
… microbeam analyses were made on zircon and baddeleyite grains from four samples using cathodoluminescent images. A Barby rhomb porphyry sample gives an U-Pb baddeleyite age of 1217 ±2 Ma and a Barby felsic tuff has an 207Pb/206Pb zircon age of 1214 ±5 Ma. The Spes Bona Syenite which intrudes …
-
U-Pb geochronology of the Duluth Complex and related hypabyssal intrusions: investigating the emplacement history of a large multiphase intrusive complex related to the 1.1 Ga Midcontinent Rift.
… number of dated samples. New high-precision U-Pb baddeleyite and zircon ages from five mafic intrusions related to the Duluth Complex builds on the work of Paces and Miller (1993). Ages from three intrusions that span the entire range of Duluth Complex layered series intrusive activity indicate …
-
The oxygen, carbon & hydrogen isotope geochemistry of the Phalaborwa Complex, South Africa
… range from -112 to -52‰. The δ18O values of baddeleyite (2.99 ± 0.13‰, 1σ, n=2), olivine (6.12 ± 0.08‰, 1σ, n=2), diopside (7.37 ± 0.40‰, 1σ, n=24), magnetite (3.46 ± 0.75‰, 1σ, n=8), apatite (6.40 ± 0.59‰, 1σ, n=13) and aegirine (6.39 ± 0.65‰, 1σ, n=10) are thought to be magmatic, with most …
-
The Sukulu complex, Eastern Uganda and The origin of the African carbonatites
… minerals apatite, magnetite, pyrochlore and baddeleyite. The soil covers the perimeter of the carbonatite and tills the wide valley embayments running into the centre of the complex. The description given constitutes the first detailed discussion of the economic geology of a new type of …
-
The Effect of Zr-Doping and Crystallite Size on the Mechanical Properties of TiO2 Rutile and Anatase
… computations. The stable structure at 0 GPa is baddeleyite for LDA computations and anatase for GGA computations, contradicting experimental results that determine rutile as the most stable phase. Rutile appears to have the highest energy in LDA computations and intermediate energy in GGA …