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- W341865839 abstract "From the seismic data collected in 1990 across the Brooks Range (BR), arctic Alaska, the authors have produced a low-fold, vertical-incidence-reflection (CMP) image and a velocity model of this Mesozoic/Tertiary fold-and-thrust belt. Although the CMP image and velocity model reveal major features, both are limited: reflections are sparse in some regions and velocity in the upper crust is not well constrained below about 5 km. Wide-angle reflections (WR) are used to provide additional constraints, especially for the CMP image. These WR can be traced over much longer distances and with much less ambiguity than is possible on the CMP image alone. WR also provide additional, albeit weak, velocity constraints. Major results are: (1) in the northern BR, the CMP image and WR both reveal two zones of gently south-dipping, echelon reflections, in the upper and middle crust, which are interpreted as the basal part of the Endicott Mts allochthon and the basal part of allochthonous North Slope rocks, respectively; (2) in the middle crust of the southern BR, gently north-dipping reflections are seen in the CMP image to truncate or diverge northward from south-dipping reflections in overlying terranes, but they can not be traced into the central BR; (3) inmore » the central BR, reflections at the base of the Endicott Mts. allochthon are folded across the Doonerak antiform, and from the antiformal axis southward, the echelon reflections above the master decollement deform into a series of stretched S's, defining lens-shaped, duplexed bodies of rock; (4) Moho deepens from 35-km depth south of the Brooks Range to 46-km depth in the northern Brooks Range, the highest part, and shoals abruptly to 35-km beneath the North Slope.« less" @default.
- W341865839 created "2016-06-24" @default.
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- W341865839 date "1993-04-01" @default.
- W341865839 modified "2023-09-26" @default.
- W341865839 title "The 1990 Brooks Range, Alaska, seismic experiment: Results from vertical-incidence and wide-angle reflection data and refraction data" @default.
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