In this paper the petrogenesis and magmatism of igneous rocks in the Panxi Rift are discussed based on the major element, transition metallic element, REE and other trace element analysis data of more than 40 samples....In this paper the petrogenesis and magmatism of igneous rocks in the Panxi Rift are discussed based on the major element, transition metallic element, REE and other trace element analysis data of more than 40 samples.According to major element data, a feature of bimodal distribution is displayed. The transition metal patterns show that Cr and Ni are highly depleted and Ti is highly concentrated, reflecting a rather complex history of crystallization differentiation.The distribution patterns of hygromagmatophile element abundance of basalts normalized with primary mantle values are shown to be intermediate between those of alkali basalts and continental tholeiites. This provides evidence suggesting that the basalts were generated in a rift tectonic environment, and that the primary magma came deeply from the primary mantle as a result of partial melting of garnet lherzolite.展开更多
文摘In this paper the petrogenesis and magmatism of igneous rocks in the Panxi Rift are discussed based on the major element, transition metallic element, REE and other trace element analysis data of more than 40 samples.According to major element data, a feature of bimodal distribution is displayed. The transition metal patterns show that Cr and Ni are highly depleted and Ti is highly concentrated, reflecting a rather complex history of crystallization differentiation.The distribution patterns of hygromagmatophile element abundance of basalts normalized with primary mantle values are shown to be intermediate between those of alkali basalts and continental tholeiites. This provides evidence suggesting that the basalts were generated in a rift tectonic environment, and that the primary magma came deeply from the primary mantle as a result of partial melting of garnet lherzolite.
