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- W2056564951 abstract "Research Article| December 01, 2003 Magmagenesis in the Ordovician backarc basins of the Northern Qilian Mountains, China Lin-Qi Xia; Lin-Qi Xia 1Xi'an Institute of Geology and Mineral Resources, Ministry of Land and Resources of China, Xi'an 710054, Shaanxi, China Search for other works by this author on: GSW Google Scholar Zu-Chun Xia; Zu-Chun Xia 1Xi'an Institute of Geology and Mineral Resources, Ministry of Land and Resources of China, Xi'an 710054, Shaanxi, China Search for other works by this author on: GSW Google Scholar Xue-Yi Xu Xue-Yi Xu 1Xi'an Institute of Geology and Mineral Resources, Ministry of Land and Resources of China, Xi'an 710054, Shaanxi, China Search for other works by this author on: GSW Google Scholar GSA Bulletin (2003) 115 (12): 1510–1522. https://doi.org/10.1130/B25269.1 Article history received: 03 Oct 2002 rev-recd: 25 Apr 2003 accepted: 23 Jun 2003 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Lin-Qi Xia, Zu-Chun Xia, Xue-Yi Xu; Magmagenesis in the Ordovician backarc basins of the Northern Qilian Mountains, China. GSA Bulletin 2003;; 115 (12): 1510–1522. doi: https://doi.org/10.1130/B25269.1 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 SocietyGSA Bulletin Search Advanced Search Abstract This paper reports the results of a petrologic and geochemical study of lavas from early Paleozoic backarc basins in the Northern Qilian Mountains in the People's Republic of China. Petrographic and geochemical characteristics of lavas reflect the changing styles of extension: typical basic lavas due to backarc seafloor spreading are found in the north, but to the south, the lava compositions become increasingly similar to arc lavas. Glassy (devitrified now), sparsely phyric basic lavas characterize the regions of seafloor spreading. Felsic lavas and porphyritic basic lavas occur in the southern, island-arc rifting part of the study area. Geochemical compositions distinguish between mature arc rocks (Y < 20 ppm, TiO2 < 0.60 wt%, Th/Yb > 0.60) in the north and rocks formed during backarc spreading (Y > 20 ppm, TiO2 > 1.0 wt%, Th/Yb < 0.30) in the south. These changes reflect the changing processes of melt generation associated with an evolving backarc basin such as the Ordovician backarc basin that is preserved in the Northern Qilian Mountains. The rift axis captured the arc magmatic flux in the early island-arc rifting stage so that the lavas that erupted from this part of the rift cannot be compositionally distinguished from arc lavas. As backarc extension continued and the backarc basin widened, the rift axis moved progressively away from the arc magmatic flux. The distance between the axis of extension and the zone of subarc mantle downwelling was eventually sufficient to allow mantle upwelling to become established under the axis of extension and to generate a mid-ocean ridge–like decompression melting system to support backarc-basin spreading. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2056564951 title "Magmagenesis in the Ordovician backarc basins of the Northern Qilian Mountains, China" @default.
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