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Metamorphic Geology of Cumberland Pe...

Hamilton, Brett John Hugh McAuley.

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Metamorphic Geology of Cumberland Peninsula, Baffin Island, Nunavut, Canada.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Metamorphic Geology of Cumberland Peninsula, Baffin Island, Nunavut, Canada./
作者:	Hamilton, Brett John Hugh McAuley.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	378 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
Contained By:	Dissertation Abstracts International78-05B(E).
標題:	Petrology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10296329
ISBN:	9781369395617

Metamorphic Geology of Cumberland Peninsula, Baffin Island, Nunavut, Canada.
Hamilton, Brett John Hugh McAuley.

Metamorphic Geology of Cumberland Peninsula, Baffin Island, Nunavut, Canada. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 378 p.

Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.

Thesis (Ph.D.)--University of Calgary (Canada), 2016.

Cumberland Peninsula, Nunavut, exposes Archean and Paleoproterozoic metamorphic rocks that are part of the Paleoproterozoic Trans-Hudson Orogen. Six metamorphic zones are present on Cumberland Peninsula. A central elongate domain, called the Touak-Sunneshine metamorphic low (TSML), contains nested muscovite+staurolite+chlorite, muscovite+andalusite, and muscovite+ sillimanite zones, and parallels both regional strike and the margin of several granite-granodiorite plutons of the Qikiqtarjuaq plutonic suite. A K-feldspar+sillimanite zone constitutes much of the peninsula. Cordierite+garnet and orthopyroxene zones are spatially associated with Qikiqtarjuaq plutonic suite intrusions. To determine pressure-temperature conditions of the abundant migmatitic rocks on Cumberland Peninsula, an in-depth assessment of the application of phase diagram techniques to heterogeneous anatectic migmatitic samples was performed via thermodynamic simulations. The results pertain to migmatites in general. Key results include: the peak temperature can be recovered if just the composition of the melanosome is used to constrain the phase diagram; and temperature estimates from sample compositions comprising a combination of melanosome and leucosome can lead to over- or under-estimates of peak temperature by --25 to 50 °C. Peak metamorphic conditions on Cumberland Peninsula ranged from <4:0 kbar, 545--560 °C in the muscovite+staurolite+chlorite zone to 5:6--7:6 kbar, 700--730 °C in the K-feldspar+sillimanite zone to 4:8--6:8 kbar, 730--820 °C in the cordierite+garnet and orthopyroxene zones. Microstructures indicate low-pressure metamorphism in the TSML occurred after an early deformation event and before the two dominant phases of penetrative deformation, whereas metamorphism in the K-feldspar+sillimanite zone, and locally elsewhere, was synchronous with and possibly outlasted penetrative deformation. Garnet zoning patterns and U-Pb monazite ages suggest that Cumberland Peninsula was affected by two metamorphic events. First, intrusion of the Qikiqtarjuaq plutonic suite in the northern part of the peninsula resulted in 1897 +/- 8 to 1880 +/- 8 Ma contact metamorphism, manifested in outwardly nested metamorphic zones. Second, 1871 +/- 7 to 1853+/- 3 Ma regional metamorphism variably overprinted the entire Peninsula. Cumberland Peninsula is interpreted to have been part of the southern margin of the Rae craton, which was the upper plate in a convergent tectonic setting by ca. 1:89 Ga, before colliding with a smaller crustal block by ca. 1:87 Ga.

ISBN: 9781369395617Subjects--Topical Terms:

535210
Petrology.

Metamorphic Geology of Cumberland Peninsula, Baffin Island, Nunavut, Canada.
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