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安徽铜陵狮子山矿田岩浆岩年代学、Hf同位素、地球化学及岩石成因

, PP. 1268-1286

Keywords: 锆石U-Pb定年,Hf同位素,岩浆混合,狮子山矿田,铜陵

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Abstract:

?安徽铜陵狮子山矿田侵入岩LA-ICPMS定年结果表明,白芒山辉石闪长岩及冬瓜山和狮子山石英闪长岩结晶年龄分别为(139.9±1.9),(138.0±1.7)和(138.4±1.7)Ma.三个岩体均为高钾、富碱、准铝质岩石,在稀土与微量元素特征上均表现出富集轻稀土元素、大离子亲石元素,亏损重稀土元素、高场强元素,弱Eu负异常等特征.锆石原位Hf同位素分析显示三个岩体的锆石Hf同位素组成均具有较大的变化范围:白芒山辉石闪长岩εHf(t)值为-3.3~-14.4;冬瓜山、狮子山石英闪长岩εHf(t)值分别为-14.1~-23.9和-14.7~-26.9,明显低于白芒山辉石闪长岩的εHf(t)值.元素地球化学和锆石Hf同位素特征表明,这三个岩体可能由源于富集岩石圈地幔的富水基性岩浆与下地壳部分熔融的花岗质岩浆发生混合后形成,冬瓜山和狮子山石英闪长岩比白芒山辉石闪长岩混有更多的地壳组分.冬瓜山和狮子山石英闪长岩具有类似埃达克质岩石的地球化学特征,如高Sr,低Y,高Sr/Y比值等.这可能是发生混合作用后的岩浆经过一定的磷灰石、榍石分离结晶,而斜长石分离结晶不明显造成的.这三个岩体是区域构造体制由挤压转换为伸展过程中复杂壳幔相互作用的产物.

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