Reconstruction of the Talkeetna intraoceanic arc of Alaska through thermobarometry
Hacker, Bradley R.
Kelemen, Peter B.
Behn, Mark D.
MetadataShow full item record
The Talkeetna arc is one of two intraoceanic arcs where much of the section from the upper mantle through the volcanic carapace is well exposed. We reconstruct the vertical section of the Talkeetna arc by determining the (re)crystallization pressures at various structural levels. The thermobarometry shows that the tonalites and quartz diorites intruded at ∼5–9 km into a volcanic section estimated from stratigraphy to be 7 km thick. The shallowest, Tazlina and Barnette, gabbros crystallized at ∼17–24 km; the Klanelneechena Klippe crystallized at ∼24–26 km; and the base of the arc crystallized at ∼35 km depth. The arc had a volcanic:plutonic ratio of ∼1:3–1:4. However, many or most of the felsic plutonic rocks may represent crystallized liquids rather than cumulates so that the liquid:cumulate ratio might be 1:2 or larger. The current 5- to 7-km structural thickness of the plutonic section of the arc is ∼15–30% of the original 23- to 28-km thickness. The bulk composition of the original Talkeetna arc section was ∼51–58 wt % SiO2.
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): B03204, doi:10.1029/2007JB005208.
Showing items related by title, author, creator and subject.
Field, Dawn; Amaral-Zettler, Linda A.; Cochrane, Guy R.; Cole, James R.; Dawyndt, Peter; Garrity, George M.; Gilbert, Jack A.; Glockner, Frank Oliver; Hirschman, Lynette; Karsch-Mizrachi, Ilene; Klenk, Hans-Peter; Knight, Rob; Kottmann, Renzo; Kyrpides, Nikos C.; Meyer, Folker; San Gil, Inigo; Sansone, Susanna-Assunta; Schriml, Lynn M.; Sterk, Peter; Tatusova, Tatiana; Ussery, David W.; White, Owen; Wooley, John (Public Library of Science, 2011-06-21)A vast and rich body of information has grown up as a result of the world's enthusiasm for 'omics technologies. Finding ways to describe and make available this information that maximise its usefulness has become a major ...
Field, Dawn; Sterk, Peter; Kottmann, Renzo; De Smet, Wim; Amaral-Zettler, Linda A.; Cochrane, Guy R.; James, Cole R.; Davies, Neil; Dawyndt, Peter; Garrity, George M.; Gilbert, Jack A.; Glockner, Frank Oliver; Hirschman, Lynette; Klenk, Hans-Peter; Knight, Rob; Kyrpides, Nikos C.; Meyer, Folker; Karsch-Mizrachi, Ilene; Morrison, Norman; Robbins, Robert J.; San Gil, Inigo; Sansone, Susanna-Assunta; Schriml, Lynn M.; Tatusova, Tatiana; Ussery, David W.; Yilmaz, Pelin; White, Owen; Wooley, John; Caporaso, Gregory (Genomic Standards Consortium, 2014)The Genomic Standards Consortium (GSC) is an open-membership community working towards the development, implementation and harmonization of standards in the field of genomics. The mission of the GSC is to improve digital ...
Stephen, Ralph A.; Bromirski, Peter D.; Gerstoft, Peter; Worcester, Peter F. (2013-12)Microseism noise, generated by wave-wave interaction of ocean surface gravity waves and peaking between 0.1 and 0.5Hz, is the largest amplitude, continuous (acceleration) vibration on earth in the seismic band from 0.0001 ...