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Ultrachron

 

 

  • Zr in rutile
  • Mapping Phosphorous
  • Publications

Zr in rutile thermometry (see Ferry and Watson, 2007; Baldwin et al., 2007)

Relatively low spatial resolution analysis 20 kV, 200nA, 5 spectrometer integration, 600 sec. acquisitions Integrating PET, two LPETs, and 2 VLPETs

Single point detection limit of 14ppm (3σ) for Zr

Grain average yields an overall detection limit of 3 ppm (3σ) for 15 points, and 4 ppm (3σ) for 10 points

Note Ti Ka will strongly fluoresce ZrLa so beware proximity to ziron.

Upper left: BSE image of eclogite East Athabasca region (Saskatchewan). Rutile (center of image) is used to assess thermometric conditions at high pressure. Upper right: P-T diagram for East Athabasca region. Eclogit box at 16kbar and 750 deg defines peak conditions at 1904Ma, and subsequent decompression path. For details see Baldwin et al. (2007).
 
 
Olivine crystal in Nakhla meteorite. BSE image (above) reveals K-rich melt inclusion in large olivine grain. Map of phosphorous (upper right) reveals complex internal structure possibly related to growth regimes .P-rich regions represent rapid growth. Right: Interpretation of crystallographic orientation and growth zones. See Goodrich, C. A.; Treiman, A. H.; Filiberto, J.; Jercinovic, M. J. 41st Lunar and Planetary Science Conference, held March 1-5, 2010 in The Woodlands, Texas. LPI Contribution No. 1533, p.1387
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Dumond, G., Goncalves, P., Williams, M.L., and Jercinovic, M.J. (2010) Subhorizontal fabric in exhumed continental lower crust and implications for lower crustal flow: Athabasca granulite terrane, western Canadian Shield. Tectonics, 29, doi:10.1029/2009TC002514. PDF

Mahan, K.H., Wernicke, B.P., and Jercinovic, M.J. (2010) Th-U-total Pb geochronology of authigenic monazite in the Adelaide rift complex, South Autstralia, and implications for the age of the type Sturtian and Marinoan glacial deposits. Earth and Plantetary Science Letters, 289, 76-86. PDF

Jercinovic, M.J., Williams, M.L., and Lane, E.D. (2008) In-situ trace element analysis of monazite and other fine-grained accessory minerals by EPMA. Chemical Geology 254, 197-215. PDF

Dumond, G., McLean, N., Williams, M.L., Jercinovic, M.J., and Bowring, S.A. (2008) High-resolution dating of granite petrogenesis and deformation in a lower crustal shear zone, Athabasca granulite terrane, western Canadian Shield. Chemical Geology 254, 175-196. PDF

Hetherington, C.J., Williams, M.L., Jercinovic, M.J., and Mahan, K. (2008) Application of electron-probe microanalysis to composition, chronology, and occurrence of xenotime for understanding geologic processes. Chemical Geology 254, 123-147. PDF

Budzyn, B., Hetherington, C.J., Williams, M.L., Jercinovic, M.J., Dumond, G., and Michalik, M. (2008) Application of electron probe micro-analysis total Th-U-Pb geochronology to provenance studies of sedimentary rocks: An example from the Carpathian Flysch. Chemical Geology 254, 148-163. PDF

Williams, M.L., Jercinovic, M.J., and Hetherington (2007), C.J. Microprobe Monazite Geochronology: understanding geologic processes through integration of composition and chronology. Annual Review of Earth and Planetary Sciences 37, 137-175. PDF

Heumann, M.J., Bickford, M.E., Hill, B.M., McLelland, J.M., Selleck, B.W., and Jercinovic, M.J. (2007) Timing of anatexis in metapelites from the Adirondack lowlands and southern highlands, a manifestation of the Shawinigan Orogeny and subsequent AMCG magmatism. Geological Society of America Bulletin 118, 1283-1298.

Cruz, Francisco, W., Burns, S.J., Jercinovic, M.J., Karmann, I., Sharp, W.D., and Vuille, M. (2007) Evidence of rainfall variations in southern Brazil from trace element ratios (Mg/Ca and Sr/Ca) in a Late Pleistocene stalagmite. Geochimica et Cosmochimica Acta 71, 2250-2263. PDF

Mahan, K.H., Williams, M.L., Flowers, R.M., Jercinovic, M.J., Baldwin, J.A., and Bowring, S.A. (2006) Geochronological constraints on the Legs Lake shear zone with implications for regional exhumation of lower continental crust, western Churchill Province, Canadian Shield. Contributions to Mineralogy and Petrology 152, 223-242. PDF

Mahan, K.H., Goncalves, P., Williams, M.L., and Jercinovic, M.J. (2006) Dating metamorphic reactions and fluid flow: Application to exhumation of high-P granulites in a crustal-scale shear zone, western Canadian Shield. Journal of Metamorphic Geology 24, 193-217. PDF

Boyce, J. W., K. V. Hodges, W. J. Olszewski, M. J. Jercinovic, Carpenter, B.D., and Reiners, P.W. (2006), Laser microprobe (U-Th)/He geochronology, Geochem. Cosmochim Acta,70, 3031-3039. PDF

Baldwin, J.A., Bowring, S.A., Williams, M.L., & Mahan, K.H., (2006) Geochronological constraints on the evolution of high-pressure felsic granulites from an integrated electron microprobe and ID-TIMS geochemical study. Lithos 88, 173-200.

Williams, M.L., Jercinovic, M.J., Goncalves, P., and Mahan, K. (2006) Format and philosophy for collecting, compiling, and reporting microprobe monazite ages. Chemical Geology225 , 1-15. PDF

 

 

Jercinovic, M.J., and Williams, M.L. (2005) Analytical perils (and progress) in electron microprobe trace element analysis applied to geochronology: Background acquisition, interferences, and beam irradiation effects. American Mineralogist90 , 526-546. PDF

Dahl, P.S., Terry, M.P., Jercinovic, M.J., Williams, M.L., Hamilton, M.A., Foland, K.A., Clement, S.M., and Friberg, L.M. (2005) Electron probe (Ultrachron) microchronometry of metamorphic monazite: Unraveling the timing of polyphase thermotectonism in the easternmost Wyoming Craton (Black Hills, South Dakota). American Mineralogist90 , 1712-1728. PDF

Dahl, P.S., Hamilton, M.A.., Jercinovic, M.J., Terry, M.P., Williams, M.L., and Frei, R. (2005) Comparative isotopic and chemical geochronometry of monazite in metamorphic rocks from the eastern Wyoming province (USA), with implications for U-Th-Pb dating by electron microprobe. American Mineralogist 90 , 619-638. PDF

Goncalves, P., Williams, M.L., and Jercinovic, M.J. (2005) Electron microprobe age mapping. American Mineralogist 90 , 578-585. PDF

Williams, M.L., and Jercinovic, M.J. (2002) Microprobe monazite geochronology: Putting absolute time into microstructural analysis. Journal of Structural Geology24 , 1013-1028.

Shaw, C.A., Karlstrom, K.E., Williams, M.L., Jercinovic, M.J., and McCoy, A.M. (2001) Electron microprobe monazite dating of ca. 1.71 – 1.63 Ga and ca. 1.45-1.38 deformation in the Homestake shear zone, Colorado: Origin and early evolution of a persistent intracontinental tectonic zone. Geology29 , 739-742.

Terry, M.T., Robinson, P., Hamilton, M.A., and Jercinovic, M.J. (2000) Monazite geochronology of UHP and HP metamorphism, deformation, and exhumation, Nordoyane, Western Gneiss Region, Norway. American Mineralogist 85, 1651-1664.

Williams, M.L., Jercinovic, M.J., and Terry, M.P. (1999) Age mapping and dating of monazite on the electron microprobe: Deconvoluting multistage tectonic histories. Geology27, 1023-1026.

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