Crustal growth by magmatic underplating: Isotopic evidence from the northern Sherman batholith

Research Article| June 01, 2001 Crustal growth by magmatic underplating: Isotopic evidence from the northern Sherman batholith C.D. Frost; C.D. Frost 1Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, USA Search for other works by this author on: GSW Google Scholar J.M. Bell; J.M. Bell 1Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, USA Search for other works by this author on: GSW Google Scholar B.R. Frost; B.R. Frost 1Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, USA Search for other works by this author on: GSW Google Scholar K.R. Chamberlain K.R. Chamberlain 1Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, USA Search for other works by this author on: GSW Google Scholar Geology (2001) 29 (6): 515–518. https://doi.org/10.1130/0091-7613(2001)029<0515:CGBMUI>2.0.CO;2 Article history received: 02 Oct 2000 rev-recd: 13 Feb 2001 accepted: 23 Feb 2001 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation C.D. Frost, J.M. Bell, B.R. Frost, K.R. Chamberlain; Crustal growth by magmatic underplating: Isotopic evidence from the northern Sherman batholith. Geology 2001;; 29 (6): 515–518. doi: https://doi.org/10.1130/0091-7613(2001)029<0515:CGBMUI>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract It is accepted that continental growth takes place both in intraplate and convergent margin settings, but the relative importance of crustal growth in these two tectonic environments is the subject of ongoing debate. In this study we suggest that magmatic underplating in continental interiors results in significant increases in continental volume. We maintain that A-type, or anorogenic, granites are derived from young, underplated mafic crust. Magma sources for A-type granites typically are difficult to identify due to the lack of isotopic contrast between mantle and crustal sources. However, the northern portion of the Mesoproterozoic Sherman batholith, southeastern Wyoming, intrudes Archean gneiss. Isotopic data from these granites preclude derivation from felsic crust, and instead require the involvement of a mantle or mantle-like isotopic reservoir. The data are analogous to those for eruptive equivalents of A-type granites, the fayalite rhyolites of Yellowstone, which also ascended through Archean felsic crust but carry little Archean isotopic signature. Anorogenic granites thus may represent a middle to upper crustal record of magmatic underplating at depth. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.