Late Quaternary variability in sediment residence time and provenance in the Gulf of Carpentaria, northern Australia

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews Pub Date : 2025-07-17 DOI:10.1016/j.quascirev.2025.109529

Anthony Dosseto , Ashley N. Martin , Jan-Hendrik May , Les Kinsley , Inna Karatchevtseva , Allan R. Chivas

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Abstract

Uranium (U) isotopes in detrital marine sediments provide a means to estimate sediment residence time—the duration particles spend in the landscape prior to deposition. When paired with physical parameters such as specific surface area, these data offer insight into sediment sourcing and transport processes. Here, we apply comminution dating to two sediment cores from the Gulf of Carpentaria (GoC), spanning the past 120 ka. Residence times were calculated using a Monte Carlo simulation under two scenarios: with and without post-depositional ²³⁴U recoil loss. The latter produced geologically consistent results, ranging from ∼5 to 38 ka, while the former yielded mostly unrealistic (negative) values.

Core MD972132, dominated by northern catchments, exhibits significantly shorter residence times (mean = 12.6 ka) than MD972133 (mean = 24.4 ka), reflecting faster sediment routing or reduced alluvial storage. Temporal trends suggest longer residence times during MIS 3, coinciding with regional aridity and limited fluvial connectivity, and shorter residence times post-LGM as sediment delivery increased with monsoonal intensification. Principal component analysis and clustering further differentiate sediment provenance between cores. Our results show that U-isotope-based residence time estimates, when integrated with sedimentological data, can resolve sediment routing dynamics in large tropical catchments and track climate-driven shifts in source–sink connectivity over glacial–interglacial cycles.

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澳大利亚北部卡彭塔利亚湾沉积物停留时间和物源的晚第四纪变异

海洋碎屑沉积物中的铀(U)同位素提供了一种估算沉积物停留时间的方法，即颗粒在沉积之前在景观中停留的时间。当与比表面积等物理参数配对时，这些数据可以深入了解沉积物的来源和运输过程。在这里，我们对卡奔塔利亚湾（GoC）的两个沉积物岩心进行了粉碎测年，时间跨度为120 ka。使用蒙特卡罗模拟计算了两种情况下的停留时间：有和没有沉积后234U后坐力损失。后者得到了地质上一致的结果，范围从~ 5到38 ka，而前者得到的大多是不现实的（负）值。MD972132芯以北部集水区为主，其停留时间（平均为12.6 ka）明显短于MD972133芯（平均为24.4 ka），这反映了沉积物移动速度更快或冲积量减少。时间趋势表明，在MIS 3期间停留时间较长，与区域干旱和有限的河流连通性相一致；随着季风强度的增强，沉积物输送量增加，lgm后停留时间较短。主成分分析和聚类进一步区分了不同岩心沉积物的物源。我们的研究结果表明，基于u同位素的停留时间估算，当与沉积学数据相结合时，可以解决大型热带流域的沉积物路径动力学问题，并跟踪冰川-间冰期旋回中源-汇连通性的气候驱动变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Quaternary Science Reviews 地学-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

388

审稿时长

3 months

期刊介绍： Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.