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Zircon, monazite, and xenotime as provenance indicators in selected Precambrian crystalline rocks, Black Hills uplift, South Dakota

Hark, Jessica Sandra
http://rave.ohiolink.edu/etdc/view?acc_num=kent1247685629

Abstract Details

2009, MS, Kent State University, College of Arts and Sciences / Department of Earth Sciences.
The eastern margin of the Archean Wyoming craton (Black Hills, SD) records a complex history of Precambrian thermotectonism and magmatism associated with convergence, rifting, and supercontinent cycles. U-Pb isotopic spot-analysis by ion-microprobe of zircon, monazite, and xenotime in six rocks from here provides new insights into part of this history. Firstly, quartzite and metapelite xenoliths in the 2560 Ma Little Elk Granite (LEG) record 207Pb/206Pb upper-intercept ages of 2554 ± 15 Ma (2σ, MSWD = 18) and 2552 ± 14 Ma (2σ, MSWD = 3.2), indicating that older, pre-LEG zircon was reconstituted during LEG reheating. Secondly, nine populations of detrital zircon were found within the 2560-2480 Ma Boxelder Creek metaconglomerate, which range in age from 2590 to 3370 Ma and thereby indicate Wyoming cratonic provenance. Thirdly, zircon from the Bogus Jim mafic sill (BJS) has yielded a 207Pb/206Pb upper-intercept age of 2011.8 ± 3.5 Ma (2σ, MSWD = 1.8), which constrains the time of magmatism, represents a maximum age for deposition of the Homestake iron formation and its associated gold deposit, and indicates that the eastern Wyoming craton was actively rifting at this time (probably from the southern Superior craton). Fourthly, magmatic zircon, monazite, and xenotime in the Harney Peak Granite (HPG) have yielded precise 207Pb/206Pb ages of 1716.8 ± 9.3 Ma (2σ, MSWD = 0.95); 1703.2 ± 2.2 Ma (2σ, MSWD = 2.1); and 1695.9 ± 2.9 Ma (2σ, MSWD = 1.8), respectively. Within error, these results appear to indicate that the HPG magmatic event lasted for 9-33 (or 23 +10 -12) Myr.
Peter S. Dahl, PhD (Advisor)
Abdul Shakoor, PhD (Committee Member)
Donna Witter, PhD (Committee Member)
153 p.
Geochemistry; Geology
Precambrian; Black Hills; geochronology; provenance; ion-microprobe; zircon; monazite; xenotime

Recommended Citations

Citations

  • Hark, J. S. (2009). Zircon, monazite, and xenotime as provenance indicators in selected Precambrian crystalline rocks, Black Hills uplift, South Dakota [Master's thesis, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1247685629

    APA Style (7th edition)

  • Hark, Jessica. Zircon, monazite, and xenotime as provenance indicators in selected Precambrian crystalline rocks, Black Hills uplift, South Dakota. 2009. Kent State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1247685629.

    MLA Style (8th edition)

  • Hark, Jessica. "Zircon, monazite, and xenotime as provenance indicators in selected Precambrian crystalline rocks, Black Hills uplift, South Dakota." Master's thesis, Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1247685629

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Kent State University and OhioLINK.