Rare earth abundances and Rb-Sr systematics of basalts,gabbro, anorthosite and minor granitic rocks from the Indian Ocean Ridge System,Western Indian Ocean     

Carl E. Hedge  Kiyoto Futa  Celeste G. Engel  Robert L. Fisher 《Contributions to Mineralogy and Petrology》1979,68(4):373-376

Basalts dredged from the Mid-Indian Ocean Ridge System have rare earth, Rb, and Sr concentrations like those from other mid-ocean ridges, but have slightly higher Sr⁸⁷/Sr⁸⁶ ratios. Underlying gabbroic complexes are similar to the basalts in Sr⁸⁷/Sr⁸⁶, but are poorer K, Rb, and in rare earths. The chemical and isotopic data, as well as the geologic relations suggest a cumulate origin for the bulk of the gabbroic complexes.  相似文献