文章基本信息

标题：The complexity of sediment recycling as revealed by common Pb isotopes in K-feldspar
本地全文：下载
作者：Simon P. Johnson ; Christopher L. Kirkland ; Noreen J. Evans 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2018
卷号：9
期号：5
页码：1515-1527
DOI：10.1016/j.gsf.2018.03.009
语种：English
出版社：Elsevier
摘要：AbstractDetrital zircon U–Pb geochronology has become the gold standard in evaluating source to sink relationships in sedimentary basins. However, the physical and chemical robustness of zircon, which make it such a useful mineral for provenance studies, is also a hindrance as zircon can be recycled through numerous sedimentary basins, thus obscuring the first cycle source to sink relationship. An elegant approach to addressing this potential issue is to compare the Pb isotope composition of detrital K-feldspar, a mineral which is unlikely to survive more than one erosion-transport-deposition cycle, with that of magmatic K-feldspar from potential basement source terranes. Here we present newin situPb isotope data on detrital K-feldspar from two Proterozoic arkosic sandstones from Western Australia, and magmatic K-feldspar grains from potential igneous source rocks, as inferred by the age and Hf isotope composition of detrital zircon grains. The data indicate that the detrital zircon and K-feldspar grains could not have been liberated from the same source rocks, and that the zircon has most likely been recycled through older sedimentary basins. These results provide a more complete understanding of apparently simple source to sink relationships in this part of Proterozoic Western Australia.Graphical abstractDisplay OmittedHighlights•Sediment provenance defined by Pb isotopic composition of detrital K-feldspar.•Pb isotopic composition of detrital K-feldspar compared with grains from potential igneous source rocks.•More complicated source to sink pathways recognized than by traditional detrital zircon studies.
关键词：KeywordsenDetrital zirconK-feldsparPb isotopesSediment provenanceSediment recycling