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MS Thesis Emproto.pdf (8.67 MB)

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Column Anion and Trace Element Chemistry of Apatite from Crustal Carbontite Deposits in the Grenville Province: Implications for Crustal Carbontite Genesi

Emproto, Christopher Robert
http://orcid.org/0000-0002-9535-3057
http://rave.ohiolink.edu/etdc/view?acc_num=miami1596134287925232

Abstract Details

2020, Master of Science, Miami University, Geology and Environmental Earth Science.
Apatite group minerals are ubiquitous in crustal carbonatites and can accommodate many elements useful for assessing the chemical provenance of these rocks. Apatite from c. 65 crustal carbonatite occurrences in Ontario, Quebec and New York were analyzed using single crystal X-ray diffraction (SCXRD) to determine the column anion composition (via structure and site occupancy refinement) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to assess the trace element composition. Four trends of crustal carbonatites are apparent (Bancroft, Frontenac, Lowlands and Highlands). Most crustal carbonatite apatite is hydroxyl-rich fluorapatite of the approximate composition c. 60:40 F:OH, although chlorapatite and hydroxylapatite also occur. Apatite from the Bancroft and Highlands trends is generally less enriched in Mg and Cl but more enriched in Fe, Mn, As, U, Th and REE than apatite from the Frontenac and Lowlands trends, which commonly contains Cl to c. 10% column anion site occupancy. Plots of 1/δSr vs 1/δEu suggest evolution towards larger Sr/Eu anomalies and higher U/Th/REE concentrations possibly resulting from lower degrees of crust partial melting during the Ottawan-Rigolet transition, whereas no geographic trend in U/Th/REE concentrations and Sr/Eu anomalies is observed in Frontenac and Lowlands samples. No correlations to wall rock chemistry were observed.
John Rakovan (Advisor)
Claire McLeod (Committee Member)
Mark Krekeler (Committee Member)
177 p.
Geology; Mineralogy; Petrology
apatite; Grenville; trace elements; SCXRD; column anion chemistry; crustal carbonatite; vein dike

Recommended Citations

Citations

  • Emproto, C. R. (2020). Column Anion and Trace Element Chemistry of Apatite from Crustal Carbontite Deposits in the Grenville Province: Implications for Crustal Carbontite Genesi [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1596134287925232

    APA Style (7th edition)

  • Emproto, Christopher. Column Anion and Trace Element Chemistry of Apatite from Crustal Carbontite Deposits in the Grenville Province: Implications for Crustal Carbontite Genesi . 2020. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1596134287925232.

    MLA Style (8th edition)

  • Emproto, Christopher. "Column Anion and Trace Element Chemistry of Apatite from Crustal Carbontite Deposits in the Grenville Province: Implications for Crustal Carbontite Genesi ." Master's thesis, Miami University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1596134287925232

    Chicago Manual of Style (17th edition)

miami1596134287925232
154
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This open access ETD is published by Miami University and OhioLINK.