Title: Geochemical characteristics and tectonic significance of gabbros from Zuozhi-Shiduomobu area of Zhiduo County of eastern Qiangtang in the Qinghai-Tibet Plateau
Abstract: Located in Zhiduo County,eastern Qiangtang,Qinghai-Tibet Plateau,and formed in the Late Permian,the Zuozhi-Shiduomobu gabbros belt is consisted simply of gabbros.The gabbros are rich in alkaline with Na2O high than K2O,being the rocks of calc-alkaline series.Their trace elements are characterized by enrichment of large-ion-lithophile elements(LILE) and fractionation of high-field-strength elements(HFSE),displaying typical characteristics of within-plate basalts. Light rare earth elements are significantly enriched with δEu values varying from slightly negative to positive.(87Sr/86Sr)i ratios are relatively low,ranging from 0.70419 to 0.70471;eNd(t) values are relatively high,ranging from 4.3 to 4.9,showing that the gabbros are derived from a slightly depleted mantle source.It is believed that the gabbros from the ZuozhiShiduomobu area are formed in a within-plate extensive tectonic environment.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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