CHEMICAL-COMPOSITION OF THE PRIMITIVE MANTLE SOURCE OF PERIDOTITE INCLUSIONS AT MOUNT-LIANSHAN, LIUHE COUNTY, JIANGSU PROVINCE

This paper presents a study of the major and trace element composition s of fresh mantle-derived spinel Iherzolite and harzburgite inclusions from Cenozoic alkaline basalt in Mount Lianshan and Mount Panshi, Liu he County, Jiangsu Province. An estimation is made of the contents of the major elements and some of the trace elements in the primitive man tle source region of the area, from which the authors have obtained Mg O/Al2O3=7.86. The contents of MgO and Al2O3 are also obtained as 37.58 % and 4.78% respectively based on the correlation of MgO-Al2O3. Then, the contents of various elements in the primitive mantle are calculate d using their regression equations with MgO, and the compositon of the primitive mantle, a basic issue in geochemistry study, is discussed o n that basis.