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《Geotectonica Et Metallogenia》 1993-03
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LITHOCHEMISTRY OF POTASSIC LAMPROPHYRES FROM WESTERN BORDER OF THE YANGZI PLATFORM: IMPLICATIONS FOR PALEOSUBDUCTION AND THE OCCURRENCE OF DIAMONDS

SHU Xiaoxing (Pepartment of Marine Geology, Tongj i University, Shanghai,200092)  
In order to evaluate the diamond-bearing properties of the potassic lamprophyres distributed along the west border of Yangzi Platform, a detailed investigation on the geology, petrology, and geochemistry was conducted. The results show that the lamprophyres from the research area are poor in Ti, Nb and rich in K, Rb, Ba, Sr. This composition occurred when the plate located to the west of research area commenced subduction beneath the Yangzi Plat. form. Under the influence of the subduction, the source mantle of the potassic lamprophyres has a high geothermal gradient and oxygen fugacity. Such conditions are unstable and are not conducive to the formation and preservation of diamonds. Therefore, these findings suggest diamond-bearing potential of the potassic lamprophyres in the research area to be low.
【Fund】: 国家教委博士生导师基金(编号:2-2-87-24);; 国家自然科学基金(编号:4897005)
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