Geochemistry and petrogenesis of the Yishak Volcanic Sequence,Kudi ophiolite,West Kunlun (NW China): implications for the magmatic evolution in a subduction zone environment |
| |
| Authors: | Email author" target="_blank">Chao?YuanEmail author Min?Sun Mei-Fu?Zhou Wenjiao?Xiao Hui?Zhou |
| |
| Institution: | (1) Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;(2) Department of Earth Sciences, The University of Hong Kong, Hong Kong, China;(3) State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;(4) Center of Science and Technology, Peking University, Beijing, 100864, China |
| |
| Abstract: | The Yishak Volcanic Series (YVS) is part of the Late Cambrian Kudi ophiolite in the western Kunlun Mountains, NW China, which
marks the oldest suture zone in the Tibetan Plateau. The YVS is a well-preserved sequence comprising five conformable units
(A to E) of basalts to andesites, with mafic dykes in Units A to D. These rocks are sequentially characterized upward by geochemical
features of N-MORB (Unit A), E-MORB (Unit B), island-arc basalt (Unit C), BABB (Unit D and mafic dykes) and boninite series
rocks (Unit E), reflecting complex interactions among various source components. The evolution of magma compositions from
MORB-dominated to boninite series rocks clearly indicates temporally increasing subduction signatures, which, in combination
with the extensional tectonic background, suggests that the Kudi ophiolite most likely formed in a spontaneous nucleation
of subduction zone. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
