The Fuchuan ophiolite suite in Shexian Counly,Anhui Province ,was formed in the Middle-Late Proterozoic.It is characterized by varying Nd[∈Nd(T)=0.7-3.8],Sr[∈Sr(T)=30.7-53.9] AND O(δ^18O=3.2-11.0%o) and low ratios ...The Fuchuan ophiolite suite in Shexian Counly,Anhui Province ,was formed in the Middle-Late Proterozoic.It is characterized by varying Nd[∈Nd(T)=0.7-3.8],Sr[∈Sr(T)=30.7-53.9] AND O(δ^18O=3.2-11.0%o) and low ratios of Nd/La(<0.8),Ti/Y(<350) and Ti/V(<30).These characteristics,in combination with geological features, indicate that the ophiolite suite was formed in the axial part of the back-arc basin of the Jiangnan ancient island arc at the southeastern margin of the Yangtze Plate.The varying ∈Nd(T) was caused by the contamination of the underlying immature sialic crust during the formation of the ophiolite and variations in ∈Sr(T) and δ^18 O may have resulted from hydrothermal alteration by seawater during or shortly after its formation.展开更多
文摘The Fuchuan ophiolite suite in Shexian Counly,Anhui Province ,was formed in the Middle-Late Proterozoic.It is characterized by varying Nd[∈Nd(T)=0.7-3.8],Sr[∈Sr(T)=30.7-53.9] AND O(δ^18O=3.2-11.0%o) and low ratios of Nd/La(<0.8),Ti/Y(<350) and Ti/V(<30).These characteristics,in combination with geological features, indicate that the ophiolite suite was formed in the axial part of the back-arc basin of the Jiangnan ancient island arc at the southeastern margin of the Yangtze Plate.The varying ∈Nd(T) was caused by the contamination of the underlying immature sialic crust during the formation of the ophiolite and variations in ∈Sr(T) and δ^18 O may have resulted from hydrothermal alteration by seawater during or shortly after its formation.
