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《Geotectonica Et Metallogenia》 2003-03
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GEOCHEMISTRY AND PETROGENESIS OF THE MESOZOIC HIGH-Mg DIORITES FROM WESTERN SHANDONG

WU Xiang-yang,XU Yi-gang,MA Jin-lo ng,XU Ji-feng and WANG Qiang(Guangzhou Institute of Geochemistr y,Chinese Academy of Sciences,Guangzhou510640,China)  
The Mesozoic intrusives in western S handong include gabbros,diorites,granodiorites and granites with diorites being dominant.The diorites from Laiwu and Yinan have high Mg # (0.45~0.69)and Cr contents(up to278μg /g),and are rich in large ion lithophile elements(LILE)and depleted in high strength field e lements(HFSE).They compositionally resemble the late Archaean high-Mg diorites from Superior Province in North America and magnesian andesites in modern subduction zones.Specifically,the relatively high HREE(Yb =1.1~1.9μg /g)contents and low La /Yb ratios(6.7~20)in the high-Mg diorites from western Shandong show their close affinity to the Piip-typ e magnesian andesites.It is propose d that the high-Mg diorites from western Shandong marked the early phases of m agmatism in a continental extension al setting.Their petrogenesis is pr obably related to partial melting of the lithospheric mantle that is metasomati zed by adakitic melts derived from su bducted Yangtze continental crust under the North China Craton.
【Fund】: 国家杰出青年基金项目(编号:49925308)资助.
【CateGory Index】: P588.122
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