Tectonothermics of the North American great plains basement

Drury, Malcolm J.

doi:10.1016/0040-1951(88)90136-9

Cited by 12 publications

(4 citation statements)

References 42 publications

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“…whereq r is the reduced (deep) heat flow density (10 −3 W/m 2 )), A 0 is volumetric heat generation at crystalline crust, D(m) is the slope of the heat flux density/volumetric heat generation relationship (Jessop, 1990;Drury, 1988). In case of simple volumetric heat generation model, D is the thickness of the upper crustal high volumetric heat generation zone.…”

Section: Heat Flux Densitymentioning

confidence: 99%

“…In case of simple volumetric heat generation model, D is the thickness of the upper crustal high volumetric heat generation zone. An established statistical relationship between the rock heat flux density and the volumetric heat generation exists (Birch et al, 1968;Jessop, 1990;Lachenbruch, 1970Lachenbruch, , 1971Blackwell, 2007;Drury, 1988). For the study areas it is assumed:…”

Section: Heat Flux Densitymentioning

confidence: 99%

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Geothermal energy potential in the St-Lawrence River area, Québec

Majorowicz¹,

Minea²

2012

Geothermics

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Section: Heat Flux Densitymentioning

confidence: 99%

Section: Heat Flux Densitymentioning

confidence: 99%

Geothermal energy potential in the St-Lawrence River area, Québec

Majorowicz¹,

Minea²

2012

Geothermics

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“…Abundant new Sm-Nd data (Peterman and Futa, 1988;Frost, 1993) together with differences in lithotypes, structure, and geophysical characteristics have clearly demonstrated that the Superior and Wyoming provinces are not correlative as might be expected by simple lateral extension across the Trans-Hudson orogen (Sims and others, 1991). In addition, the Wyoming province has a higher heat flow than the Superior province (Drury, 1988), indicating that it has a more radiogenic crust. Thus, the Wyoming province is not a rifted segment off the Superior province that was emplaced in its present position during closure of the Trans-Hudson ocean; instead, it is exotic crust relative to the Superior province.…”

Section: Archean Cratonsmentioning

confidence: 99%

Archean and early Proterozoic tectonic framework of north-central United States and adjacent Canada

Sims¹

1995

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The southern part of the Canadian Shield and the subsurface of the southern interior platform comprise two Archean cratons and three Early Proterozoic collisional orogens. The Middle Proterozoic Midcontinent rift system transects the older rocks in the eastern part of the area. Middle Proterozoic rhyolite-granite complexes overlap these terranes to the south. Anorogenic granite (~ 1.45 Ga) bodies of the Transcontinental Proterozoic province intrude older rocks in a belt extending from Wyoming northeastward to Lake Huron. The two Archean cratons, the Superior and Wyoming provinces, are welded by the Early Proterozoic Trans-Hudson orogen. Sm-Nd data together with differences in lithotypes, structure, and geophysical characteristics demonstrate that the two Archean provinces are not correlative as might be expected by simple lateral extension across the Trans-Hudson orogen. The Superior province consists mainly of alternating greenstone-granite and metasedimentary gneiss terranes (subprovinces) formed = 2.7 Ga that are separated from generally older Archean gneiss to the south by the Great Lakes tectonic zone, a major paleosuture. The Wyoming province, on the other hand, consists of Early to Middle Archean crust that formed between 3.8 and 2.8 Ga. Distinct subprovinces such as are present in the Superior province have not yet been identified in the Wyoming province. The three Early Proterozoic collisional orogens are (1) the Penokean, which extends from the Lake Superior region through the Lake Huron region and in the subsurface from the Lake Superior region to Nebraska, (2) the north-trending Trans-Hudson, and (3) the Central Plains, which truncates the two Archean cratons and the Trans-Hudson and Penokean orogens to the south. The Penokean in the type area (Lake Superior region) consists of a deformed, south-facing, passive continental margin prism (~ 2.2-1.85 Ga), including foredeep deposits, overlying Archean basement that is juxtaposed to the south with accreted juvenile arc rocks of the Wisconsin magmatic terranes. The suture is the north-verging Niagara fault (or shear) zone. The arc rocks formed during the interval 1.9-1.845 Ga. Collision occurred at = 1.85 Ga. In the Lake Huron area, an older asymmetric succession (Huron Supergroup; 2.5-2.2 Ga) of dominantly metasedimentary rocks lies on the continental margin; this sequence was deformed and metamorphosed prior to 2.2 Ga and again, during the Penokean orogeny, at 1.85 Ga. The Trans-Hudson orogen is composed mainly of Early Proterozoic arc-related rocks but includes substantial amounts of Archean basement rocks. In the main outcrop area in northern Saskatchewan, the principal igneous and metamorphic events occurred between 1,910 and 1,830 Ma, approximately contemporaneously with rock-forming events within the Penokean orogen. Seismic reflection profiling at latitude 48°30' N. suggests that both the east and west boundaries of the orogen dip beneath the respective Archean cratons, suggesting subduction beneath the two Archean cratons. Outcrop data in the Hart...

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“…The boreholes that do cross the Precambrian unconformity penetrate at most a few meters into the basement. While the cores and cutting materials obtained from these boreholes have provided key information in developing the age and radioactivity of the rocks, there is insufficient core or log information on the geophysically important properties of the basement (Burwash and Culbert 1976;Burwash and Cumming 1976;Burwash 1979;Drury 1988). This lack of access has limited scientific studies of the craton to the few short core samples and to remote mapping of Proterozoic tectonic terranes using magnetic surveys.…”

mentioning

confidence: 99%