扬子克拉通内存在太古代成熟陆壳:来自岩石学、同位素年代学和地球化学证据

被引：9

作者：

汪正江 ^{[1
]}

王剑 ^{[1
]}

杜秋定 ^{[1
]}

邓奇 ^{[1
,2
]}

杨菲 ^{[1
,3
]}

伍皓 ^{[1
,2
]}

机构：

[1] 国土资源部成都地质矿产研究所

[2] 中国地质科学院研究生部

[3] 山东科技大学研究生院

来源：

科学通报 | 2013年 / 58卷 / 17期

关键词：

扬子克拉通; 新太古代; 成熟陆壳; A型花岗岩; 杨坡群;

D O I：

暂无

中图分类号：

P534.2 [太古代（界）];

学科分类号：

摘要：

前人研究表明,扬子陆块存在广泛的太古代结晶基底,但是目前除在宜昌黄陵穹窿一带有确切证据显示有太古代高级变质地体(崆岭群下部)以外,还未见其他地区有出露的报道.为进一步了解扬子克拉通的基底组成及其形成演化过程,本文对钟祥胡集地区杨坡群及侵入其中的钾质花岗岩进行了岩石学、同位素年代学和岩石地球化学研究.研究显示,胡集钾质花岗岩的SHRIMP锆石U-Pb年龄为2655±9Ma,属于新太古代中期.同时该套花岗岩主量元素富硅和碱,贫Ca,Mg,P和Ti;微量元素富Rb,Th,Ga,Y和Zr,亏损Sr,Ba,Nb和Ta,强烈亏损Eu,高FeO*/MgO(=32.0～58.7)和104Ga/Al(=3.19～3.41)比值,表现出明显的具有陆壳源区的铝质A型花岗岩特征.因此,杨坡群沉积岩石组合和侵入其中的高分异A型花岗岩均证明,在新太古代中期以前,扬子克拉通已经发育有较为成熟的陆壳了.这一突破性发现为深入研究扬子克拉通陆块基底的形成演化过程开辟了新的窗口.

引用

页码：1651 / 1660

页数：10

共 31 条

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