scholarly journals Late Mesozoic and Cenozoic thermotectonic evolution of the central Brooks Range and adjacent North Slope foreland basin, Alaska: Including fission track results from the Trans-Alaska Crustal Transect (TACT)

1997 ◽  
Vol 102 (B9) ◽  
pp. 20821-20845 ◽  
Author(s):  
Paul B. O'Sullivan ◽  
John M. Murphy ◽  
Ann E. Blythe
Keyword(s):  
Fission Track ◽  
Foreland Basin ◽  
North Slope ◽  
Brooks Range ◽  
Late Mesozoic ◽  
Crustal Transect

scholarly journals An integrated model for the tectonic development of the frontal Brooks Range and Colville Basin 250 km west of the Trans-Alaska Crustal Transect

1997 ◽  
Vol 102 (B9) ◽  
pp. 20685-20708 ◽  
Author(s):  
Frances Cole ◽  
Kenneth J. Bird ◽  
Jaime Toro ◽  
François Roure ◽  
Paul B. O'Sullivan ◽  
...  
Keyword(s):  
Integrated Model ◽  
Brooks Range ◽  
Tectonic Development ◽  
Crustal Transect

The North Slope Foreland Basin, Alaska

1992 ◽  
Author(s):  
Kenneth J. Bird ◽  
Cornelius M. Molenaar
Keyword(s):  
Foreland Basin ◽  
North Slope ◽  
The North

Chapter 13 Siliciclastic sedimentation in a foreland basin to the Sveconorwegian orogen and dolerites (0.98–0.95 Ga) related to intracratonic rifting

2020 ◽  
Vol 50 (1) ◽  
pp. 325-333 ◽  
Author(s):  
Magnus Ripa ◽  
Michael B. Stephens
Keyword(s):  
Fission Track ◽  
Sedimentary Rocks ◽  
Foreland Basin ◽  
Time Span ◽  
Southern Sweden ◽  
Lacustrine Environment ◽  
Fission Track Thermochronology ◽  
Sveconorwegian Orogen ◽  
Magmatic Suite ◽  
East West

AbstractSub-ophitic, equigranular or plagioclase-phyric dolerite dykes, referred to as the Blekinge–Dalarna dolerite (BDD) swarm, were emplaced during the time span 0.98–0.95 Ga and trend NNE–NNW in an arcuate fashion, parallel to and east of the Sveconorwegian orogen. Dolerite sills are locally present. These rocks are subalkaline to alkaline with a monzogabbroic or gabbroic composition and show a predominantly within-plate tectonic affinity. ɛNd and ɛHf values fall in the range −2 to +4 and +1 to +5, respectively. Siliciclastic sedimentary rocks (Almesåkra Group) in a small outlier in southern Sweden were deposited in an aeolian to fluviatile or lacustrine environment and an arid or semi-arid warm palaeoclimate, coevally with the dolerite sills. Smaller occurrences of sandstone with peperitic field relationships to the BDD dykes are known from other localities. The spatial distribution, orientation and age of the BDD magmatic suite suggest roughly east–west extension in the eastern, cratonic foreland to the Sveconorwegian orogen during the latest phase of this mountain-building event, the age data tentatively suggesting a younging to the east. The siliciclastic sedimentary rocks represent an erosional relict of a larger and spatially much more extensive early Tonian foreland basin to this orogen, as proposed earlier on the basis of fission-track thermochronology.

Style, controls, and timing of fold-and-thrust deformation of the Jago stock, northeastern Brooks Range, Alaska

1997 ◽  
Vol 34 (7) ◽  
pp. 992-1007 ◽  
Author(s):  
Paige R. Peapples ◽  
Wesley K. Wallace ◽  
Catherine L. Hanks ◽  
Paul W. Layer ◽  
Paul B. O'Sullivan
Keyword(s):  
Fission Track ◽  
White Mica ◽  
Duplex Structure ◽  
Cooling History ◽  
Brooks Range ◽  
Metasedimentary Rocks ◽  
Mechanical Stratigraphy ◽  
Crystalline Body ◽  
Deformational Behavior ◽  
Fission Track Ages

Involvement of the Devonian Jago stock in Cenozoic fold-and-thrust deformation of the northeastern Brooks Range illustrates the influence of a relatively small, isolated crystalline body on the mechanical stratigraphy and subsequent deformational behavior of an otherwise layered sedimentary package. The small size of the stock allowed it and the structurally coupled overlying Mississippian Kekiktuk Conglomerate to deform nonpenetratively as a horse in a regional duplex, in contrast to the semiductile behavior of the nearby but much larger Okpilak batholith. Shear was localized in the upper part of the stock and the conglomerate due to partial detachment of the overlying Carboniferous Lisburne Group. North-vergent thrust-related folds formed in the mechanically layered Lisburne Group carbonates instead of the symmetrical, unfaulted detachment folds more typical of the region because an underlying regional detachment horizon in the Mississippian Kayak Shale is depositionally absent over the stock. Unusually competent contact-metamorphosed pre-Mississippian metasedimentary rocks were thrust over the stock and its cover because a ramp formed at the edge of the stock and cut upsection through the Lisburne Group due to the absence of Kayak Shale. A 40Ar/39Ar age of foliated white mica indicates thrusting of the stock by 61 Ma; fission-track ages indicate cooling at ~44 and ~28 Ma. These ages indicate a cooling history that implies ~11 km of unroofing since ~61 Ma, only ~1.5 km of which can be explained by the inferred duplex structure. The remaining ~9.5 km of unroofing is most likely due to subduplex structural thickening above a deep regional detachment.

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