The Lower Cretaceous Botucatu Formation records the development of widespread dry–aeolian desert sedimentation throughout the Paraná Basin in south‐west Gondwana. To reconstruct the provenance of the aeolian sediment, petrography, granulometric analysis, U‐Pb detrital zircon ages have been determined from along the southern basin margin in Rio Grande do Sul state (southern Brazil) and Uruguay (Tacuarembó region). The dataset reveals a mean composition Qt₈₉F₈L₃, comprising very fine to medium‐grained quartozose and feldspatho‐quartzose framework. Heavy mineral analysis reveals an overall dominance of zircon, tourmaline and rutile grains (mean ZTR_0.84) with sporadic garnet, epidote and pyrolusite occurrences. The detrital zircon U‐Pb ages are dominated by Cambrian to Neoproterozoic (515 to 650 Ma), Tonian to Stenian (900 to 1250 Ma) and Orosirian to Rhyacian (1.8 to 2.2 Ga) material. The detrital zircon dataset demonstrates a significant lateral variation in sediment provenance: Cambrian to Neoproterozoic detrital zircons dominate in the east, while Tonian to Stenian and Orosirian to Rhyacian ages predominate in the west of the study area. Sandstones are quartz‐rich with dominantly durable zircon, tourmaline and rutile heavy mineral suite, with subtle but statistically significant along‐strike differences in heavy mineral populations and detrital mineralogy which are thought to record local sediment input points into the aeolian system. The similar age spectra of Botucatu desert with proximal Paraná Basin units, the predominance of quartzose, and zircon, tourmaline and rutile components, suggests that recycling is the mechanism responsible for the erg feeding.

中文翻译：

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冈瓦纳西南部Botucatu组（巴西和乌拉圭）白垩纪早期沙漠沉积物来源的控制

下白垩纪Botucatu组记录了整个冈瓦纳西南部Paraná盆地广泛的干风沙沙漠沉积的发展。为了重建风沙沉积物的来源，岩相学，粒度分析，已经确定了南里奥格兰德州（巴西南部）和乌拉圭（塔库阿林博地区）沿盆地南部边缘的U-Pb碎屑锆石年龄。该数据集揭示了平均组成Qt ₈₉ F ₈ L ₃，其组成包括非常细的至中等粒度的四方糖和长石方糖-石英糖构架。重矿物分析揭示了锆石，电气石和金红石晶粒的总体优势（平均ZTR _0.84），偶尔会出现石榴石，附子和软锰矿。碎屑锆石的U-Pb年龄主要由寒武纪到新元古代（515到650 Ma），从Tonian到Stenian（900到1250 Ma）和从Orosirian到Rhyacian（1.8至2.2 Ga）物质为主。碎屑锆石数据集显示出沉积物物源的显着横向变化：寒武纪至新元古代碎屑锆石在东部占主导地位，而Tonian至Stenian和Orosirian至Rhyacian年龄在研究区西部占主导地位。砂岩富含石英，主要具有耐用的锆石，电气石和金红石重矿物组合，在重矿物种群和碎屑矿物学上具有细微但统计上显着的沿走向差异，据认为这些差异记录了风沙系统中的局部沉积物输入点。