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地球学报  2003 

北秦岭构造属性与元古代构造演化

Keywords: 同位素年代学,岩浆活动,大地构造,前寒武纪,秦岭

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Abstract:

秦岭前塞武纪地质、地球化学和年代学证据表明,北秦岭具有明显高的初始εNd(t)值和Pb同位素比值特征,区别于明显低初始εNd(t)值和Pb同位素比值特征的华北陆块和扬子块体群。北秦岭与南秦岭具有明显不同的前寒武纪构造与演化特征。北秦岭是2000Ma左右形成于华北陆块南侧洋岛基础上的独立陆块,经历2200-1800Ma和1400-900Ma分别以垂向加积增生和侧向加积增生为主要机制的地壳生长。北秦岭在早元古代洋盆演化基础上,首次于1600Ma左右拼接于华北陆块南缘,1300-1000Ma发生扩张裂解,出现宽坪裂谷-洋盆构造环境,100Ma左右再次拼贴于华北陆块南缘。同时,北秦岭南侧可能发生与南秦岭陆块群中的陡岭微陆块的拼接。

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