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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Non-river flood barium signals in the skeletons of corals from coastal Queensland, Australia
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Non-river flood barium signals in the skeletons of corals from coastal Queensland, Australia

机译：来自澳大利亚昆士兰沿海的珊瑚骨骼中的非河流洪水钡信号

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Two corals from coastal Queensland (Cow and Calf Islands, and Orpheus Island) have been analysed for a suite of trace elements by laser-ablation ICP-MS (LA-ICP-MS). Barium signals in these two corals are 'anomalous' in comparison with Ba behaviour seen in other near-shore corals from this region. The two corals display large sharp peaks in spring which do not correlate with markers of river discharge (Y/Ca and fluorescence). This Ba pattern contrasts with 'normal' behaviour-characterised here by the patterns previously published for two other coastal Queensland corals (King Reef and Pandora Reef), which display Ba peaks in summer associated with flooding of nearby rivers [1] [D.J. Sinclair, M.T. McCulloch, Corals record low mobile barium concentrations in the Burdekin River during the 1974 flood: evidence for limited Ba supply to rivers?, Palaeogeogr. Palaeoclimatol. Pplacoecol. 214 (1-2) (2004) 155-174].Similarities are observed between the anomalous Ba in the Queensland corals and other published patterns of Ba behaviour in corals from South Africa and the Arabian Sea. This non-river flood Ba behaviour is characterized by large sharp spikes of Ba which are resistant to oxidative cleaning and form a continuous horizon within the coral. Curiously, not all corals from a region display anomalous Ba behaviour despite being in similar environments. The timing of anomalous Ba is consistent within a coral, but may vary from one location to the next. Anomalous Ba spikes are too large to be caused by Ba-rich upwelling, and no single environmental forcing function seems to be able to account for their timing.This combination of observations argues against an exogenous abiotic source for the anomalous Ba signal; instead, it may result from a biological event triggered by a combination of environmental parameters. Three hypotheses are presented, and critically tested against the observations: barite inclusion following phytoplankton blooms, decaying blooms of the blue-green algae Trichodesmium, and physiological perturbations associated coral mass spawning. None of the three hypotheses are fully consistent with all of the observations and it is concluded that no satisfactory explanation currently exists for the anomalous Ba spikes. (c) 2005 Elsevier B.V. All rights reserved.
机译：通过激光烧蚀ICP-MS（LA-ICP-MS）分析了昆士兰沿海的两个珊瑚（牛和小岛以及奥菲斯岛）中的痕量元素。与该地区其他近岸珊瑚的钡行为相比，这两种珊瑚的钡信号“异常”。两只珊瑚在春季显示出大的尖峰，这与河流排放的标记（Y / Ca和荧光）无关。这种Ba模式与先前在昆士兰州的另外两个沿海珊瑚（King Reef和Pandora Reef）所发布的模式所表征的“正常”行为形成了鲜明对比，该模式在夏季表现出Ba峰，与附近河流的洪水有关[1]。辛克莱（M.T.） 1974年洪水期间，珊瑚礁的麦卡洛克（McCulloch，Corals）记录了布尔德金河中移动钡的低含量：证据表明河流中的钡供应有限？，古地理。古气候。 Pplacoecol。 214（1-2）（2004）155-174]。在昆士兰珊瑚的异常Ba与来自南非和阿拉伯海的珊瑚中Ba行为的其他已公布模式之间存在相似之处。这种非河流洪水Ba的行为特征是Ba的尖峰很大，这些尖峰抗氧化清洁并在珊瑚内形成连续的地平线。奇怪的是，尽管处于相似的环境中，但并非该地区的所有珊瑚都表现出异常的Ba行为。在珊瑚中，Ba异常的时机是一致的，但是在一个位置到另一个位置可能会有所不同。异常的Ba尖峰太大，无法由富含Ba的上升流引起，似乎没有单一的环境强迫功能能够解释它们的时机。这种观察结果相结合，是异常Ba信号的外源性非生物来源。相反，它可能是由环境参数组合触发的生物事件导致的。提出了三个假设，并对这些假设进行了严格的检验：浮游植物开花后的重晶石包裹体，蓝绿藻Trichodesmium的腐烂开花以及与珊瑚群产卵相关的生理扰动。这三个假设均未与所有观察结果完全一致，因此得出结论，目前尚无令人满意的解释说明Ba峰异常。 （c）2005 Elsevier B.V.保留所有权利。

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