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Mineralogical Perspectives: Using Mineral Chemistry to Unravel the Magmatic Architecture of Granitic Batholiths

Haley, Maureen Y
http://rave.ohiolink.edu/etdc/view?acc_num=miami1547567947436507

Abstract Details

2019, Master of Science, Miami University, Geology and Environmental Earth Science.
The mineralogy and chemistry of igneous rocks record the processes associated with their assembly. Earth’s upper crust is ~ 86 % granitic and the processes and sources associated with their construction can be constrained by utilizing petrographic and in-situ geochemical studies. In this study, the mineralogy and chemistry of the Drammen (1,811 km3) and the Finnemarka (336 km3) batholiths of the Oslo Rift, Norway are utilized to evaluate the petrogenesis of granitoid magmas. The lithologies sampled (n = 16) are composed of Qtz, and feldspar ± Bt ± Amph ± Ttn. The major elements from bulk rock samples (n = 45) classify these granites as peraluminous to metaluminous with trace elements consistent with A-type magmas. Amphiboles (n = 57) exhibit calcic signatures (Si 5.5 to 8 apfu at (Mg/(Mg+Fe2+) 0 to 1.0), and the major oxides (n = 131) are consistent with subalkaline to weakly alkaline melts. Sampled feldspars are optically zoned and are predominantly sanidine (n = 304) and albite (n = 155). This variation indicates the likelihood of multiple feldspar populations. However, the trace elements in amphibole and major elements in feldspar exhibit minor changes, indicating minimal magma addition into the system. Amphiboles (n = 131) exhibit crustal-derived signatures based on wt. % Al2O3 < 11 when compared to wt. % TiO2 and when apfu Al < 0.5 is compared with apfu Si (n = 128). This implies that these batholiths were constructed from the partial melting of pre-existing crustal lithologies, broadly consistent with whole rock peraluminous signatures.
Claire McLeod (Advisor)
Euan Mitchell (Committee Member)
Elisabeth Widom (Committee Member)
873 p.
Geochemistry; Geology
granitoids, amphibole, feldspar, in-situ, batholith, intraplate

Recommended Citations

Citations

  • Haley, M. Y. (2019). Mineralogical Perspectives: Using Mineral Chemistry to Unravel the Magmatic Architecture of Granitic Batholiths [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1547567947436507

    APA Style (7th edition)

  • Haley, Maureen. Mineralogical Perspectives: Using Mineral Chemistry to Unravel the Magmatic Architecture of Granitic Batholiths. 2019. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1547567947436507.

    MLA Style (8th edition)

  • Haley, Maureen. "Mineralogical Perspectives: Using Mineral Chemistry to Unravel the Magmatic Architecture of Granitic Batholiths." Master's thesis, Miami University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1547567947436507

    Chicago Manual of Style (17th edition)

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