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有什么在发生于k - pg边界形成金属铱以外的异常吗?

铱的铱异常标志着浓度升高-早第三纪过渡期的积淀。铱据说来自撞击器,这是应该铱含量远高于地壳。

其他金属呢?是否有一个观察增加其他元素的?例如,锇是另一个极其罕见的元素在地壳。有一个锇异常吗?如果不是,为什么铱异常限制而不是其他金属?

回答

根据会议文章(可以亲铁元素丰度和比率可能发生于k - pg边界形成用于区分类型的炮弹?][1],(Belza et al . 2013年)状态,浓缩不仅在铱,但也在其他铂族元素和亲铁元素。From the article [Platinum-group elements (PGE) and rhenium in marine sediments across the Cretaceous– Tertiary boundary: Constraints on Re-PGE transport in the marine environment][2] (Lee et al. 2003) elaborates that from > A traverse across the KTB in the South Pacific pelagic clay core found elevated levels of Re, Pt, Ir, Os, and Ru, each of which is approximately symmetrically distributed over a distance of 1.8 m across the KTB. (KTB is a reference to Cretaceous-Tertiary Boundary from the article). In a re-evaluation of geochemical data in [Reevaluation of siderophile element abundances and ratios across the Cretaceous–Paleogene (K–Pg) boundary: Implications for the nature of the projectile][3] (Goderis et al. 2013), took into account several more studies (published and unpublished), find that cobalt, chromium and nickel display in *some places*, an elevated concentration; however, the Co/Cr, Ni/Co, Ni/Cr, Co/Ir, Ni/Ir and Cr/Ir ratio are considerably higher than that of the average continental crust, which the authors suggest is consistent with chondrites. [1]: http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2167.pdf [2]: http://www.ruf.rice.edu/~ctlee/GCAKTB2003.pdf [3]: http://we.vub.ac.be/~dglg/Web/Claeys/pdf/Goderis-2013-GCA.pdf

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