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大别地体新店超高压榴辉岩锆石Lu-Hf同位素研究 被引量:1

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摘要 对大别山南部新店超高压变质榴辉岩中变质锆石进行了原位LA-MC-ICP-MS的Lu-Hf同位素分析,发现变质增生锆石有低176Lu/177Hf(0.000004~0.000211)和高176Hf/177Hf(0.282544~0.282612)同位素组成,原岩继承锆石和重结晶变质锆石具有高176Lu/177Hf(0.000090~0.002144)和低176Hf/177Hf(0.282266~0.282466)组成.增生锆石的低176Lu/177Hf缘自变质作用锆石中Lu降低和Hf增高,增生锆石的高176Hf/177Hf继承自岩石中其他高Lu/Hf比矿物演化所生成的高放射成因Hf.原岩锆石变质重结晶作用不会引起锆石Lu-Hf同位素明显再造,锆石Lu-Hf体系比U-Pb体系有更好的稳定性.增生锆石形成时的Hf同位素组成能代表同时代的变质全岩体系的Hf同位素组成.新店榴辉岩原岩锆石形成时的εHf值为3.0,表明其物源主要来自弱亏损地幔,或者亏损地幔和古老地壳物质的混合.
出处 《中国科学(D辑)》 CSCD 北大核心 2007年第3期289-297,共9页 Science in China(Series D)
基金 国家自然科学基金项目(批准号:40573008) 教育部博士点基金项目(批准号:20040358050)
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