Cover beds older than the mid-pleistocene revolution and the provenance of their eolian components, La Sal Mountains, Utah, USA

Cover beds older than the mid-pleistocene revolution and the provenance of their eolian components, La Sal Mountains, Utah, USA
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比更新世中期革命更古老的覆盖层及其风成成分的来源,美国犹他州拉萨尔山脉

DOI:
10.1016/j.quascirev.2018.01.012
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发表时间:
2018
影响因子:
4
通讯作者:
Kleber
Kleber
中科院分区:
地球科学1区
文献类型:
--
作者:
Krautz;Gärtner;Andreas;Hofmann;Linnemann;Kleber

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我们使用铀-铅(U-Pb)对沉积在拉萨尔山脉的火山灰层中的锆石进行测年,确定了超过 c 的年龄。 1.3 Ma至下伏黄土混合坡沉积物(覆盖层)及其中发育的古土壤。我们首次表明,中更新世革命之前的覆盖床和土壤的性质与革命后形成的相似。然而,暴露的最深的富含碳酸盐的层位比较年轻的层位发育得更远,这表明在革命之前的某个时间(可能是在新近纪时期)存在一段富集期,其强度远远超过了较年轻的钙质层位的强度。覆盖层内碎屑锆石(DZ)年龄分布之间的显着差异使得能够高精度地重建混合风成物质的区域来源:我们能够追踪特定的覆盖层追溯到二叠纪和上白垩统岩石露头的区域。
We used uranium-lead (U-Pb) dating of zircons from a tephra layer deposited in the La Sal Mountains to assign an age of more than c. 1.3 Ma to underlying loess-mixed slope deposits (cover beds) and paleosols developed therein. For the first time, we show that properties of cover beds and soils before the Mid-Pleistocene Revolution were similar to those formed after the revolution. However, the deepest exposed carbonate-enriched horizon is much farther developed than younger ones, indicating that there was a period of enrichment by far exceeding intensities of younger calcic horizons some time before the revolution, possibly in Neogene times. Remarkable differences between age distributions of detrital zircons (DZ) within the cover beds allow reconstructing the regional provenance of mixed eolian matter with high accuracy: we were able to trace particular cover beds back to areas with outcropping Permian and Upper Cretaceous rocks.
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