1.Objectives,A nearly E-W trending Early Mesozoic alkaline and mafic rock belt is exposed on the northern margin of the North China Craton(NCC),and geochemistry and isotope studies indicate that the magmas were origin...1.Objectives,A nearly E-W trending Early Mesozoic alkaline and mafic rock belt is exposed on the northern margin of the North China Craton(NCC),and geochemistry and isotope studies indicate that the magmas were originated from the depleted lithospheric mantle,implying the thinning and destruction of the lithosphere in the northern margin and eastern of the NCC(Zhang SH et al.,2012).The Alxa Block is located in the westernmost part of the NCC,which plays a significant part in understanding the tectonic evolution of the NCC.This paper mainly reports a firstly discovered 217 Ma gabbro from the Yabulai district in the western Alxa Block,where widely exposes Late Paleozoic intermediate-acid intrusive rocks and volcanic rocks(Liu Q et al.,2017).展开更多
基金supported by the National Key Research and Development Project of the Ministry of Science and Technology of China(Grant No.2017YFC0601301)the Basic Scientific Research Fund of the Institute of Geology,Chinese Academy of Geological Sciences(No.J2103)+1 种基金the National Natural Science Foundation of China(Grant No.41572190,41972224)the China Geological Survey(Grants No.DD2019004).
文摘1.Objectives,A nearly E-W trending Early Mesozoic alkaline and mafic rock belt is exposed on the northern margin of the North China Craton(NCC),and geochemistry and isotope studies indicate that the magmas were originated from the depleted lithospheric mantle,implying the thinning and destruction of the lithosphere in the northern margin and eastern of the NCC(Zhang SH et al.,2012).The Alxa Block is located in the westernmost part of the NCC,which plays a significant part in understanding the tectonic evolution of the NCC.This paper mainly reports a firstly discovered 217 Ma gabbro from the Yabulai district in the western Alxa Block,where widely exposes Late Paleozoic intermediate-acid intrusive rocks and volcanic rocks(Liu Q et al.,2017).
