新疆尾亚含矿岩体锆石U-Pb年龄、 Sr-Nd同位素组成及其地质意义

王玉往,王京彬,王莉娟,龙灵利

新疆尾亚含矿岩体锆石U-Pb年龄、 Sr-Nd同位素组成及其地质意义

王玉往,王京彬,王莉娟,龙灵利

基金项目:
国家重点基础研究项目 , 国家自然科学基金

刊出日期: 2008-04-30

Zircon U-Pb age, Sr-Nd isotope geochemistry and geological significances of the Weiya mafic-ultramafic complex, Xinjiang

Publish Date: 30 April 2008

摘要

摘要: 东天山尾亚钒钛磁铁矿矿床是北疆地区最大的钒钛磁铁矿矿床,其含矿岩系为一套偏碱性的镁铁-超镁铁质杂岩.含矿岩石主要造岩矿物橄榄石、辉石、角闪石、黑云母和斜长石的化学成分与铁质系列的镁铁.超镁铁岩成分相似或相同;辉石、角闪石、黑云母等矿物以富钛为特点,这些矿物中Ti、Fe等在早期形成的岩石(辉橄岩、橄榄辉长岩)中较晚期岩石中有明显富集.含矿辉长岩的锆石LA-ICPMS U-Pb同位素定年结果为236±3Ma,主要成岩时代为中三叠世,代表后碰撞结束阶段的成矿作用.这套含矿镁铁.超镁铁杂岩的Sr-Nd同位素特征以εNd(t)均为正值,(87Sr/86Sr)i值较低为特征,与原始地幔相近,但在岩浆上移过程中可能有陆壳物质加入.
- 镁铁-超镁铁杂岩 /
- 锆石U-Pb年龄 /
- Sr-Nd同位素 /
- 尾亚钒钛磁铁矿矿床 /
- 东天山

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新疆尾亚含矿岩体锆石U-Pb年龄、 Sr-Nd同位素组成及其地质意义

Zircon U-Pb age, Sr-Nd isotope geochemistry and geological significances of the Weiya mafic-ultramafic complex, Xinjiang

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