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Crystal Size Distribution of Saganaga Tonalite, MN

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Crystal Size Distribution of Saganaga Tonalite, MN Crystal Size Distribution of Saganaga Tonalite, MN ALEXANDER REIMERS PETROLOGY PROJECT 2018 Regional Setting Saganaga Tonalite is situated to the north plex of the Duluth com within the Archean Superior Craton Named aer Saganaga Lake Archean in Age: ~2700 ± 50 m.y.a ◦ Rb-­‐Sr, K-­‐Ar, and U-­‐Pb dang methods were used Originated from the Algoman Orogeny (Kenoran Orogeny in Canada) before the Mid-­‐conNnental ri Saganaga Tonalite Map of!8chean terranes of Minnesota Map: usgeologymorphology.com Saganaga Tonalite Extent (USA) Algoman Orogeny Repeate. episo.es of Late Archean conNnental collisions, compressions, an. sub.ucNons Saganaga Tonalite Homogenous, composite Intrusive bo.y Intru.es Greenstone an. Northern Light Gneiss an. overlain by metase.imentary rocks of Knife Lake Group PHanson,1962) Composion ◦ Felsic ◦ 20I60Y Zuartz ◦ 50I90Y Plagioclase POligoclase or An.esine) ◦ <10Y Alkali Fel.spar Mineral Approximation Sample Plagioclase PY) KIspar PY) Zuartz PY) Other PY) 55 5 35 5 ACR1_ I 1 Saganaga Tonalite 65 5 25 5 ACR1_ I 2 65 0 30 5 ACR1_ I 3 61.67 3.33 30.00 5.00 Average • Mineral Appro6imaons were made via petrographic microscope for three .iaerent thin secons. • Average mineral percentage for the bulk rock sample is shown. Guiding Question 2etermine if the cooling rate of the Saganaga Tonalite can be esNmate. base. on 2I2 crystal size .istribuNon of Plagioclase Methods Pro.uce. 3 thin secNons Analyze. general mineral composiNon an. i.enNbe. Plagioclase crystals Import image, taken on 2r. Tackecds microscope, of thin secNons into an image analysis so;ware PDigimizer) for crystal size .istribuNon analysis Photo courtesy of Eidukat 2r. Crystal Size Distribution (CSD) Crystal size an. number .ensity are intricately o linke. t the rates of crystal growth an. nucleaon, which change in response to a variaons in magm temperature, vapor pressure, an. melt composiNon. 3I2 analysis must be .one to get truly ver, accurate .ata, howe this stu.y will analyze a 2I2 surface, so there is error built it The focus of this stu.y is to see if CS2 will work on a Tonalite using a 2I2 analysis Pfrugger g Hammer, 2010) Digimizer: Image Analysis Program Digimizer allows you to: ◦ Manipulate an Image Make Manual Measurements • Image Analysis ◦ Contrast g brightness • ◦ Background correc-on • .,4),+(nit+'f measurement • finarizaon ◦ .especkle • Distances • Overlay binary Layer ◦ Convert to color or grayscale • Perimeters • Noise redu3Non ◦ Sharpen • Areas • Obhect .etecNon ◦ Negave • Measure Angles ◦ Filters • Mark and Count Objects ◦ Etc. • Etc. www..igimizer.com Analysis of PlagioclaseLeng63+Cs. Width Minerals 3.5 3 Measure. 2ata Same Length g li.th 2.5 2 y i!0.62_6 + 0.0191 1.5 Width+@mm) Width+@mm) 1 0.5 9.5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Length (mmA+ Crystal 2iFe Cs. Amount of Crystals (PlagioclaseA+ 14 13 12 Interpretation 11 10 CS2 analysis shows that the majority of plag. grains 9 2 8 are between 0.A5 m!3 mm in area 7 6 2istribuNon shows some outliers an. has a high 5 4 variance 3 ◦ Coul. be misi.enNbe. minerals Pnuartz an. not plag) Crystals of Amount 2 1 ◦ lhole rock coul. have been slightly metamorphose. 0 an. some crystals .i.ndt melt enNrely 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 Crystal 2iFe Area (mm2A+ Conclusion Saganaga Tonalite is compose. of appro6imately 61Y!Mlag, 3Y KIspar, 30Y nuartz, 5Y Other Plag. crystals are appro6imately 30Y longer i.e than they are w Plag. crystal size .istribuNon is highly variable P0.43 m!9mm2) with the majority of crystals between P0.A5 2 m!3mm ) CS2 to .etermine cooling rate in 2I2 analysis was not .etermine. because of e6treme error in size .istribuNon because of the cutIsecNon eaect .
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