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北大别造山带岳西沙村镁铁 超镁铁岩侵入体的单颗粒锆石稀释法U Pb年龄测定结果为 ( 12 8± 2 .0 )Ma ,表明该岩体的侵位时代在燕山期 ,与大多数中生代花岗岩一样 ,是燕山期岩浆活动的产物 ,而不是发生在印支期与扬子陆块俯冲及超高压变质作用有关的同碰撞侵入岩
The U-Pb dating of single-particle zircon in the Xishaisha mafic ultramafite intrusive in the North Dabie Orogenic Belt was (12 8 ± 2. 0) Ma, indicating that the emplacement age of this rock mass was at Yanshanian, Like most Mesozoic granites, it is the product of the Yanshanian magmatism rather than the co-collision intrusive rocks associated with subduction and UHP metamorphism of the Indosinian block