Electron microprobe analyses are presented for phenocrysts and matrix glass in peralkaline, silica-oversaturated trachytes from the Menengai volcano, Kenya Rift Valley. The dominant phenocryst assemblage is alkali feldspar–hedenbergite–fayalite–titanomagnetite–apatite. Aenigmatite, amphibole and quartz occur rarely in more peralkaline rocks. QUILF calculations indicate that the trachytic magmas crystallised at temperatures of 854–870 °C, at relatively low oxidation states (ΔFMQ − 1.6 to − 1.7) and silica activity (aSiO2 (Qtz) of 0.60–0.66). The new analyses are used, along with published data, to outline the distribution of the main phases in the compositional spectrum of peralkaline quartz trachytes and rhyolites. There is uncertainty about the nature, or even existence, of a low-temperature zone in the alkali feldspar primary phase region, the equivalent of the thermal valley in the haplogranite system. Quartz phenocrysts may appear early or late in the crystallisation sequence, even in rocks of similar bulk composition, its appearance perhaps being a function of the F content of the melts. Whereas hedenbergite and fayalite show fairly systematic compositional trends with increasing host rock peralkalinity, amphibole compositions are variable, for reasons not yet understood. Aenigmatite crystallisation is at least partly controlled by oxygen fugacity and silica activity. With rare exceptions, ilmenite and titanomagnetite are incompatible phases but the factors controlling their relative stabilities are not clear. It appears that peralkaline trachyte–rhyolite sequences evolve along many crystallisation paths, the paths perhaps being strongly influenced by pH2O, pF2, melt F/Cl ratios and perhaps total pressure.
Last Updated: 3rd December, 2019 10:22 IST Woods Defeats Spieth To Win Inaugural Hero Shot Event Golf legend Woods defeated fellow American Jordan Spieth to win the inaugural Hero Shot event, an ideal warm-up ahead of the high-profile Hero World Challenge SUBSCRIBE TO US WE RECOMMEND Written By 9 months ago 104-year-old guns down deer on her first day of hunting in Wisconsin COMMENT First Published: 3rd December, 2019 10:22 IST 9 months ago WWE: What happened to ‘New Day’ member Xavier Woods? Where is he now? 9 months ago Internationals all fancy Presidents Cup crack at US captain Woods Golf legend Tiger Woods defeated fellow American Jordan Spieth to win the inaugural Hero Shot event, an ideal warm-up ahead of the high-profile Hero World Challenge. Woods defeated Spieth in the championship round by a score of 1,800-900 on Monday. The 43-year-old defeated a star-studded field featuring Spieth, Bryson DeChambeau, Jon Rahm, Henrik Stenson and Gary Woodland. READ | Vennam Jyothi, Abhishek Verma Win Mixed Pair Gold At Asian Archery ChampionshipThe players took their best shots at a bullseye 130 yards away, hitting shots over reflections pool at Baha Mar. The first round of the Hero Shot featured three head-to-head match-ups — Rahm vs Stenson, Woodland vs Spieth and DeChambeau vs Woods — with each player taking six shots at the target. Stenson advanced by a score of 1,200-1100, while Spieth won his match-up by a playoff score of 200-100, Woods earned a 900-700 victory. READ | India Clinch Two Gold In Badminton At South Asian GamesIn the second round, Stenson, Spieth and Woods each took another six shots with the highest two second round scores advancing to the championship. Spieth and Woods moved on, posting scores of 900 each while Stenson was eliminated after posting a score of 800. In the championship round, Spieth took on Woods with each taking final six shots at the target. Woods won in walk-off fashion as the two were tied going into the final shot. Woods called game, hitting bulls eye and earned 1,000 points in the process. The Hero World Challenge begins here from Wednesday.READ | Exclusive: Yohan Blake, Second Fastest Man On Earth To Initiate Training Program In IndiaREAD | Second-fastest Man On Earth Yohan Blake Says ‘would’ve Been A Cricketer If Not Sprinter’ LIVE TV FOLLOW US 10 months ago Tiger Woods equals Snead’s ‘crazy’ 54-year-old record for US PGA Tour WATCH US LIVE Press Trust Of India 9 months ago Lewis Hamilton speaks about seeking inspiration from Serena Williams, Valentino Rossi
Technical Adviser of Mountain and Fire and Miracles Ministries (MFM) FC, Fidelis Ilechukwu has predicted tough times for the ‘Olukoya Boys’ ahead of the upcoming season, stating that the team will be targeting a Top 10 finish in the Nigeria Professional Football League (NPFL).MFM, along with champions Plateau United, will fly Nigeria’s flag in next year’s CAF Champions League after finishing in second place in last season’s NPFL, missing out of the league title on the final Match Day, in only their second season in the top flight.However, Ilechukwu told www.busybuddiesng.com that teams in the NPFL are now aware of the capabilities of his side, and as such, will no longer take them for granted, adding that the departure of striker Stephen Odey and midfielder Oladele Oshobe will make things difficult for his side.“I know this season (2017/18) is going to be a tough season for MFM FC and we are working to make sure that at the end of it, we will able to make Top 10 in the Nigeria Professional Football League,” he said.“That’s because last season, people saw MFM as a Church team without knowing that MFM have all it takes to win the league, but this season, any team that wants to play MFM will be fully prepared.“At the same time, losing Stephen Odey and Oladele Oshobe in midfield, in as much as we have an opportunity to replace them, I know, I believe and I’m feeling it, it’s going to be a tough season for MFM FC,” Ilechukwu stated.The ‘Olukoya Boys’ are expected to participate in the 2017/18 NPFL season which begins on 14 January; the 2018 CAF Champions League as well as the Aiteo Cup. Audio Playerhttps://www.busybuddiesng.com/wp-content/uploads/2017/11/Fidelis-Nov-22.mp300:0000:0000:00Use Up/Down Arrow keys to increase or decrease volume.RelatedMartin MontoyaJune 30, 2017Similar postAUDIO: MFM Coach Banks On Divine Intervention To Win NPFL TitleSeptember 6, 2017In “Features”NPFL: Ilechukwu Eyes First-Ever NPFL Win Over EnyimbaMarch 31, 2019In “NPFl”