Abstract

A first-order process in the growth of continents is the collision and accretion of terranes against continental margins. Collision leads to the formation of a suture zone between the accreted terrane and the former continental margin. New insights on the suturing process are observed from two receiver function transects across the Mesozoic Alaska Range suture zone. Three distinct crustal sections are identified from observations of crustal thickness, intracrustal discontinuities, and Vp/Vs: a northern section with ∼27 km thick crust of felsic to intermediate composition, a central section that is ∼37 km thick that exhibits intracrustal discontinuities and has felsic to intermediate composition, and a southern section that is ∼30 km thick and has a more mafic composition. We interpret these sections to correspond with the former continental margin (Yukon composite terrane), the suture zone proper, and the allochthonous oceanic terrane (Wrangellia composite terrane). The boundary between the Yukon composite terrane and the suture zone appears to be a subhorizontal discontinuity that accommodated underthrusting of crust from the suture zone beneath the former continental margin. The boundary between the suture zone and the Wrangellia composite terrane, in contrast, appears to be a relatively discrete, vertical boundary. The observed variability in the crust across the Alaska Range suture zone is likely controlled by the differing compositions of the terranes involved, which influences how each section responds to precollisional, syncollisional, and postcollisional deformation.

Comments

An edited version of this paper was published by AGU. Copyright (year) American Geophysical Union.

P. R. K. Brennan, H. Gilbert, K. D. Ridgway, (2011), Crustal structure across the central Alaska Range: Anatomy of a Mesozoic collisional zone, Geochemistry, Geophysics, Geosystems, Vol 12, Number 4, 10.1029/2011GC003519. To view the published open abstract, go to http://dx.doi.org and enter the DOI.

Keywords

receiver functions, suture zone, Alaska Range, Wrangellia composite terrane, Hines Creek fault, Talkeetna fault

Date of this Version

2011

DOI

10.1029/2011GC003519

Custom Citation

Brennan, Patrick P. K.; Gilbert, Hersh; and Ridgway, Kenneth D., "Crustal structure across the central Alaska Range: Anatomy of a Mesozoic collisional zone" (2011). Earth, Atmospheric, and Planetary Sciences Faculty Publications.Paper 31.
http://dx.doi.org/10.1029/2011GC003519

Volume

12

Issue

4

Pages

Q04010