Alkaline basalts in the Karamay ophiolitic mélange, southern Central Asian Orogenic Belt
Here we report geological, geochronological, geochemical, and whole-rock Sr-Nd isotopic data for alkaline basalts from the Karamay ophiolitic mélange of West Junggar, southern Central Asian Orogenic Belt (CAOB).U-Pb analyses of zircon grains from a representative basalt by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) yielded a crystallization age of ca.395 ± 3 Ma, suggesting formation during the Middle Devonian.Geochemically, all the samples bear the signature of ocean island basalt (OIB), and are characterized by alkaline affinity.The results suggest that all the alkaline basalts were derived from a mantle plume-related source in an intra-oceanic setting.These observations, in combination with previous work, indicate that the alkaline basalts from Karamay can be correlated to Middle Devonian mantle plume magmatism within the Paleo-Asian Ocean.
Ophiolitic melange Mantle plume Zircon geochronology Geochemistry West Junggar Central Asian Orogenic Belt
Gaoxue Yang Yongjun Li M.Santosh Wenjiao Xiao Baokai Yang Lili Tong Shenglong Zhang
Ministry of Education Key Laboratory of Western Chinas Mineral Resources and Geological Engineering School of Earth Sciences and Resources, China University of Geosciences, Xueyuan Road,Haidian Distri State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy School of Earth Science and Resources, Changan University, Xian 710054, China
国际会议
武汉
英文
113-116
2014-10-11（万方平台首次上网日期，不代表论文的发表时间）