The mineralogy, bulk sediment geochemical composition, and U–Pb ages of detrital zircons retrieved from the Barra del Tordo (Tordo) and Tesoro beach sediments in the northwestern Gulf of Mexico were analyzed to determine their provenance. The beach sediments are mainly composed of quartz, ilmenite, magnetite, titanite, zircon, and anorthite. The weathering proxies such as the Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Plagioclase Index of Alteration (PIA), reveal a moderate-to-high intensity of weathering in the source area. The chondrite-normalized rare earth element (REE) patterns are similar to felsic igneous rocks, with large negative europium anomaly (Eu/Eu* = ~ 0.47–0.80 and ~ 0.57–0.67 in the Tordo and Tesoro beach sediments, respectively). Three major zircon U–Pb age groups are identified in the Tordo and Tesoro beach sediments, i.e., Proterozoic (~ 2039–595 Ma), Mesozoic (~ 244–70.3 Ma), and Cenozoic (~ 65.9–1.2 Ma). The differences of the zircon age spectrum between the Tordo and Tesoro beach sediments are not significant. The comparison of zircon U–Pb ages in this study with ages of potential source terranes suggests that the Mesozoic and Cenozoic zircons of the studied Tordo and Tesoro beach sediments were derived from the Eastern Alkaline Province (EAP) and Mesa Central Province (MCP). Similarly, the likely sources for the Proterozoic zircons were the Sierra Madre Oriental (SMOr) and Oaxaquia in the northwestern Gulf of Mexico. The results of this study further indicate that the sediments delivered to the beaches by rivers and redistributed by longshore currents were crucial in determining the sediment provenance.

中文翻译：

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墨西哥湾西北部塔毛利帕斯州 Barra del Tordo 和 Tesoro 海滩沉积物的来源

分析了从墨西哥湾西北部的 Barra del Tordo (Tordo) 和 Tesoro 海滩沉积物中提取的碎屑锆石的矿物学、大量沉积物地球化学成分和 U-Pb 年龄，以确定它们的来源。海滩沉积物主要由石英、钛铁矿、磁铁矿、钛铁矿、锆石和钙长石组成。诸如化学蚀变指数 (CIA)、化学风化指数 (CIW) 和斜长石蚀变指数 (PIA) 等风化指标显示源区的风化强度为中到高。球粒陨石归一化稀土元素 (REE) 模式类似于长英质火成岩，具有大的负铕异常（Eu/Eu* = ~ 0.47–0.80 和 ~ 0.57–0.67 在 Tordo 和 Tesoro 海滩沉积物中）。在 Tordo 和 Tesoro 海滩沉积物中确定了三个主要的锆石 U-Pb 年龄组，即元古代（~ 2039-595 Ma）、中生代（~ 244-70.3 Ma）和新生代（~ 65.9-1.2 Ma）。Tordo和Tesoro海滩沉积物的锆石年龄谱差异不显着。本研究中锆石 U-Pb 年龄与潜在源地体年龄的比较表明，所研究的 Tordo 和 Tesoro 海滩沉积物中的中新生代锆石来自东部碱性省 (EAP) 和中央台地省 (MCP)。同样，元古代锆石的可能来源是位于墨西哥湾西北部的 Sierra Madre Oriental (SMOr) 和 Oaxaquia。