Partial melting of a phlogopite-clinopyroxenite nodule from south-west Uganda: an experimental study bearing on the origin of highly potassic continental rift volcanics

1985 ◽  
Vol 91 (4) ◽  
pp. 321-329 ◽  
Author(s):  
F. E. Lloyd ◽  
M. Arima ◽  
A. D. Edgar
Keyword(s):  
Experimental Study ◽  
Partial Melting ◽  
Continental Rift ◽  
South West

Generation of alkaline magmas in subduction zones by partial melting of mélange diapirs—An experimental study

Geology ◽  
2018 ◽  
Vol 46 (4) ◽  
pp. 343-346 ◽  
Author(s):  
Alicia M. Cruz-Uribe ◽  
Horst R. Marschall ◽  
Glenn A. Gaetani ◽  
Véronique Le Roux
Keyword(s):  
Experimental Study ◽  
Partial Melting ◽  
Subduction Zones ◽  
Alkaline Magmas

An experimental study of the role of shear deformation on partial melting of a synthetic metapelite

2011 ◽  
Vol 503 (1-2) ◽  
pp. 92-99 ◽  
Author(s):  
Elizaveta Tumarkina ◽  
Santanu Misra ◽  
Luigi Burlini ◽  
James A.D. Connolly
Keyword(s):  
Experimental Study ◽  
Partial Melting ◽  
Shear Deformation

Upper-mantle metasomatism beneath a continental rift: clinopyroxenes in alkali mafic lavas and nodules from Sruth West Uganda

1981 ◽  
Vol 44 (335) ◽  
pp. 315-323 ◽  
Author(s):  
F. E. Lloyd
Keyword(s):  
Upper Mantle ◽  
Significant Proportion ◽  
Mantle Metasomatism ◽  
Continental Rift ◽  
Published Data ◽  
East African ◽  
South West ◽  
Mafic Lavas ◽  
Bulk Chemistry

AbstractClinopyroxenes are dominant in highly potassic, silica undersaturated mafic volcanics occurring on the western rim of the uplifted, rifted East African craton. A kimbcrlite style of eruption provides nodules of alkali clinopyroxenite (clinopyroxene + titaniferous phlogopite+titanomagnetite, apatite, sphene, and rare corroded olivine) which have similar bulk chemistry to the feldspathoid-bearing lavas. Many nodules display metasomatic textures supporting a formation from the alteration of pre-existing material; clinopyroxene growth is characterized by complex, non-oscillatory colour zoning. Comparison of natural clinopyroxene chemistry with published data for elinopyroxenes crystallized from synthetic potassium-rich mafic material, suggests that a significant proportion of the nodules crystallized at upper-mantle pressures. Neither garnet- nor orthopyroxene-bearing nodules have ever been recorded from south-west Uganda, suggesting that metasomatism of the local mantle has proceeded far enough to obliterate all recognizable remnants of four-phase lherzolite.

scholarly journals The effect of an educational intervention to improve tuberculosis infection control among nurses in Ibadan, South-West Nigeria: a quasi-experimental study

2019 ◽  
Author(s):  
Patrick Aboh Akande
Keyword(s):  
Experimental Study ◽  
Infection Control ◽  
Educational Intervention ◽  
Comparison Group ◽  
Intervention Group ◽  
Health Facilities ◽  
Post Intervention ◽  
South West ◽  
Quasi Experimental ◽  
Mixed Approach

Abstract Background: Nurses are particularly vulnerable to acquiring TB because they are in the frontline of patient care. There is inadequate implementation of cost-effective TB infection control (TBIC) measures at most health facilities. Training has been shown to be effective in improving the knowledge and work practices of nurses. This study sought to utilize a mixed-approach educational intervention to improve the TBIC-related knowledge and practices of nurses in two secondary health facilities in Ibadan, South-West Nigeria. Methods: This quasi-experimental study involved 200 (100 each in the intervention and comparison groups). Baseline data was collected in May 2014. This was followed by training of the nurses in the intervention group. After 6 months, the second wave of data was collected and the nurses in the comparison group also received the training after this. The final wave of data collection took place 12 months after the commencement of the study. Mean scores of the nurses were determined and comparison made between both groups at different time points using independent t -test. Results: The nurses in both groups were statistically comparable in their socio-demographic characteristics and baseline mean knowledge (68.6% and 67.7%) and practice scores (79.1% and 80.6%) respectively. After the intervention group received the training, there were appreciable improvements in the post-intervention scores of the group at 6 months (knowledge-85.9%; practice-98.5%), which were significantly different from those of the comparison group (knowledge-69.5%, practice-78.8%). A large effect size was demonstrated in the improvement in knowledge score in the intervention group at 6 months compared with the other group (Cohen’s d = 1.7). Similarly, there were improvements in the scores of the nurses in the comparison group at 12 months after the group had also received the training (knowledge-88.2%, practice-93.5%). At this point, the mean scores between both groups were no longer significantly different. Conclusions: The improvement in post-intervention scores implies that the mixed-approach educational intervention adopted in this study was effective in improving TBIC among the nurses. It also underscores the importance of continuous training/retraining of nurses and other healthcare workers in improving and sustaining TBIC at health facilities.

Sulfide partial melting and galena–tetrahedrite intergrowth texture: An experimental study

2020 ◽  
pp. 1-10
Author(s):  
Boddepalli Govindarao ◽  
Kamal Lochan Pruseth ◽  
Biswajit Mishra
Keyword(s):  
Experimental Study ◽  
Partial Melting ◽  
Equilibrium Phase ◽  
Ore Deposits ◽  
Phase Assemblage ◽  
Silica Tube ◽  
Sulfide Ore ◽  
Potential Indicator ◽  
Sulfide Melt ◽  
Melting Experiments

Abstract Galena–tetrahedrite intergrowth textures have been observed in some quenched run products of melting experiments conducted at 500 and 600°C in the systems ZnS–PbS–FeS–Cu2S–Sb2S3 and ZnS–PbS–FeS–Cu2S–Sb2S3–As2S3, using the evacuated silica-tube method. At 600°C the intergrowth formed an interface between sulfide melt and galena, whereas at 500°C it existed as inclusions partially embedded or completely embedded within tetrahedrite. At 600°C tetrahedrite was absent in PbS-bearing experiments, instead galena and melt were a part of the equilibrium phase assemblage. From the disposition of the galena–tetrahedrite intergrowths at 500°C it is evident that droplets of galena–tetrahedrite melt coexisted with tetrahedrite or tetrahedrite + galena and gave rise to these intergrowths upon quenching. The intergrowths coexisting with galena probably represent compositions on the galena-rich liquidus in the galena–tetrahedrite binary and those coexisting with tetrahedrite represent points on the tetrahedrite-rich liquidus. A eutectic at galena:tetrahedrite = ~30:70, very close to 500°C is apparent. It is clearly indicated that galena–tetrahedrite intergrowths can be formed by sulfide partial melting, and could be used as a potential indicator of partial melting in metamorphosed sulfide ore deposits.

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