作为澳大利亚南部干旱边缘地区地下水补给档案的水下洞穴岩层

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Calla N. Gould-Whaley, Russell N. Drysdale, Pauline C. Treble, Jan-Hendrik May, Stacey C. Priestley, John C. Hellstrom, Clare Buswell
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引用次数: 0

摘要

摘要随着人为气候变化加剧全球广大地区的干旱,了解干旱化的驱动因素比以往任何时候都更加重要。遗憾的是,全球干旱地区往往缺乏古气候记录,而且现有的档案通常由未固结沉积物组成,容易发生再加工、年代不确定性大以及气候解释不明确等问题。澳大利亚广袤的大陆内陆地区当然也是如此,那里的气候条件恶劣而干旱。位于伊卡拉-弗林德斯山脉南部(南澳大利亚)的马尔斯洞穴就位于干旱区的南缘。目前,该洞穴基本处于干燥状态,活跃的岩浆生长迹象有限。然而,历史记录和对整个洞穴的观察表明,洞穴曾定期被洪水淹没,这表明当地的水平衡曾经比现在要好得多。洞中有一层被称为垂帘岩的悬挂岩浆,当它们浸没在方解石饱和的水中时,就会在水下生长。地球化学证据,包括微量元素浓度、铀同位素比值和死碳分数,都表明在地下水补给增强期间当地地下水的上升是引发垂帘岩生长的洞穴洪水事件的原因。对从马尔斯洞穴取回的一块垂石进行的铀-钍年代测定显示,在末次冰川期,有两个多千年的生长阶段(68.5 至 65.4 千年和 51.2 至 42.3 千年)和两个短暂的生长爆发期(18.9 千年和 16.4 千年)。随后没有垂石的生长表明,在温暖的全新世间冰期条件下,强烈的缺水现象引起了偶发性而非持续性的洞穴洪水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Subaqueous speleothems as archives of groundwater recharge on Australia’s southern arid margin
Abstract. As anthropogenic climate change enhances aridity across vast regions of the globe, understanding drivers of aridification is more important than ever before. Unfortunately, arid regions globally tend to exhibit a paucity of palaeoclimate records, and the archives that are available typically comprise unconsolidated sediments prone to reworking, large dating uncertainties, and ambiguous climatic interpretations. This is certainly true of Australia’s vast continental interior, which is dominated by harsh, arid conditions. Mairs Cave, in the southern Ikara-Flinders Ranges (South Australia), is located on the southern margin of the arid zone. In the present day the cave is largely dry and there is limited evidence of active speleothem growth. However, historical records and observations throughout the cave indicate that it has been periodically flooded, suggesting the local water balance was once much more positive than it is today. The cave contains a curtain of hanging speleothems known as pendulites, which grow subaqueously when submerged in water that is saturated with respect to calcite. Geochemical evidence, including trace element concentrations, uranium isotope ratios, and Dead Carbon Fractions, all indicate that rising of the local groundwater during periods of enhanced groundwater recharge is the cause of the cave flooding events that trigger pendulite growth. Uranium-thorium dating of a pendulite retrieved from Mairs Cave has revealed two multi-millennial growth phases (68.5 to 65.4 kyr and 51.2 to 42.3 kyr) and two short bursts of growth (18.9 kyr and 16.4 kyr) during the Last Glacial Period. The absence of subsequent pendulite growth suggests that strong water deficits under warm Holocene interglacial conditions give rise to episodic, rather than persistent, cave flooding.
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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