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青藏高原羌塘东部治多县左支——失多莫卜辉长岩带形成于晚二叠世,由单一辉长岩组成。岩石富碱,Na2O>K2O为钙碱性系列。微量元素特征表现为大离子亲石元素(LILE)富集,高场强元素分异,显示板内玄武岩特征。轻稀土元素高度富集,δEu不显亏损,为弱负异常到正异常。(87Sr/86Sr)i较低,变化于0.70419~0.70471之间,εNd(t)值较高,变化于4.3~4.9之间,显示了略亏损的地幔源区特征。该辉长岩带应形成于板内伸展扩张构造环境。
The Zuodou-Lostamu gabbro belt in Zhiduo County, eastern Qiangtang, formed in the Late Permian and consisted of a single gabbro. Rock alkali, Na2O> K2O is a series of calcium and alkaline. Trace elements are characterized by enrichment of LILE, high-field-strength elemental differentiation and the display of intraplate basaltic characteristics. Light rare earth elements highly enriched, δEu no significant loss for the weak negative anomaly to positive anomalies. (87Sr / 86Sr) i is relatively low, varying between 0.70419 and 0.70471. The value of εNd (t) is relatively high and varies between 4.3 and 4.9, indicating a slightly depleted mantle source. The gabbro belt should be formed within the panel to expand and expand the structural environment.