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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Platinum group elements in proximal impactites of the Bukit Bunuh impact structure, Malaysia
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Platinum group elements in proximal impactites of the Bukit Bunuh impact structure, Malaysia

机译：马来西亚武吉Bunuh撞击结构近端撞击岩中的铂族元素

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The Bukit Bunuh in Malaysia has recently been identified as an impact structure after the discovery of possible impact-melt-like rocks and impact breccias from this area. The impact event is believed to have occurred around 1.34-1.84 Ma. Twelve impact-related rocks from this suspected impact structure were analysed in the present study for platinum group of element (PGE) content. The sample population includes proximal impactites (two impact-melt rocks and three impact breccias) and possible impact-related rocks (four mylonites) and basement granite (three in number). The results showed no observable clear distinction between the impactites and basement granite. Compared to other asteroid impact sites in the world, the impactites and impact-related rocks in the Bukit Bunuh structure clearly contain a lower concentration of PGEs. Even though previous studies reported possible evidences of shock metamorphism in the Bukit Bunuh structure and electrical resistivity survey favoured the presence of asteroid impact structure in this area as well, the absence of a clear projectile signature in our study on PGE hinders further discussion on the existence and nature of the impact. We suggest that the absence of any PGE signature in the Bukit Bunuh impactites could be indicative either of (1) an achondrite projectile, or (2) an oblique impact or (3) the presence of a volatile-rich layer.
机译：在马来西亚武吉布努（Bukit Bunuh）发现该地区可能有类似撞击融化的岩石和撞击角砾岩之后，就将其确定为撞击结构。据信该撞击事件发生在1.34-1.84 Ma附近。在本研究中，分析了来自这种可疑冲击结构的12个与冲击有关的岩石中铂族元素（PGE）含量。样本人口包括近端冲击岩（两个冲击熔岩和三个冲击角砾岩）以及可能的与冲击有关的岩石（四个my石岩）和基底花岗岩（三个）。结果表明，在撞击岩和基底花岗岩之间没有明显的区别。与世界上其他小行星撞击地点相比，武吉Bunuh结构中的撞击矿和与撞击有关的岩石显然含有较低的PGEs浓度。尽管先前的研究报道了武吉布努结构的冲击变质的可能证据，并且电阻率调查也赞成在该区域也存在小行星撞击结构，但我们在PGE的研究中缺乏清晰的弹丸特征阻碍了对存在问题的进一步讨论影响的性质。我们建议在武吉布努（Bukit Bunuh）的撞击岩中不存在任何PGE签名可能表明（1）斜长弹丸或（2）倾斜撞击或（3）富含挥发物的层。

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