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《Geochimica》 1988-04
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THE CHARACTERISTICS AND ORIGIN OF DIOPSIDE GRANITE IN SHILICUN, YUNNAN

Xie Yingwen Zhang Yuquan(Institute of Geochemistry, Academia Sinica, Guiyang)  
The diopside granite exposed east of Shilicun, Jinping County, Yunnan Province is a special type of granites in the world, which covers an area of about 25 km and extends S-N. It occurs in the Tertiary Ailaoshan-Jinshajiang rift zone. The feldspar K-Ar age is 35.7 Ma. Diopside-ferrosalite is a special melanocratie mineral in the diopside granite in this area. The petrochemical composition of the diopside granite is characterized by higer alkalis (Na2O + K2O = 10.29%), rich potassium (K2O = 5.65%) and on water (H2O = 0.2-0.3%). It lies in the field of alkali rock series, and has similar geochemical characteristics to the potash alkali rocks derived from the mantle in this area (minette, euctratite, shonkinite, alkali basalts, etc.) and the mantle-derived tonalite in Bendong, South China. The contents of REE are higher (REE = 246.9) with LREE being highly enriched (LREE/HREE = 16.5). No obvious Eu anomaly can be observed (σEu = 0.88). The REE pattern is characterized by a rightward inclined line with a slope (La/Yb) of 25.2. 87Sr/MSr = 0.707. Trace element characteristics of the di-opside granite are similar to those of volcanic arc granites. Therefore, it can be inferred that the diopside granite at Shilicun has an upper mantle source.
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