Major and trace element distributions around active volcanic vents determined by analyses of grasses: implications for element cycling and bio-monitoring

Major and trace element distributions around active volcanic vents determined by analyses of grasses: implications for element cycling and bio-monitoring
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通过草分析确定活火山口周围的主要和微量元素分布:对元素循环和生物监测的影响

DOI:
10.1007/s00445-010-0374-7
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发表时间:
2010
影响因子:
3.5
通讯作者:
Martin R
Martin R
中科院分区:
地球科学3区
文献类型:
--
作者:
Martin R

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在Masaya火山(尼加拉瓜;Rhynchelytrum epensand andpogon anguatus)和Piton de La Fourneise(2007年4月喷发喷口附近,留尼汪岛;香根草)采集了草样本,以调查对活跃火山喷口周围植物中主要和微量元素浓度的控制。样品用电感耦合等离子体质谱对多种元素进行分析,对汞进行原子吸收光谱分析。在Masaya,两种草本植物中As、Cu、Mo、Tl和K的浓度表现出与火山羽流暴露一致的简单变化模式。在ANA中也发现了类似的变异性。铝、钴、铯、汞和镁的铝、钴、铯、汞和镁。在Piton de La Fourneise,变异性的模式。Zizanioid更为复杂,与活动喷口和熔岩流排放的不同暴露有关。这些结果表明,对许多元素来说,暴露在火山排放物中是生长在活火山上的植被成分变异性的主要控制因素。因此,植被可能是火山排放元素的重要环境储存库,应被视为全球生物地球化学循环的一部分。
Samples of grass were collected at Masaya Volcano (Nicaragua;Rhynchelytrum repensandAndropogon angustatus) and the Piton de La Fournaise (around the April 2007 eruptive vent, La Réunion;Vetiveria zizanioides) to investigate the controls on major and trace element concentrations in plants around active volcanic vents. Samples were analysed using inductively coupled plasma mass spectrometry for a wide range of elements, and atomic absorption spectroscopy for Hg. At Masaya, As, Cu, Mo, Tl and K concentrations in both grass species showed a simple pattern of variability consistent with exposure to the volcanic plume. Similar variability was found inA. angustatusfor Al, Co, Cs, Hg and Mg. At the Piton de La Fournaise, the patterns of variability inV. zizanioideswere more complex and related to variable exposures to emissions from both the active vent and lava flow. These results suggest that exposure to volcanic emissions is, for many elements, the main control on compositional variability in vegetation growing on active volcanoes. Thus, vegetation may be an important environmental reservoir for elements emitted by volcanoes and should be considered as part of the global biogeochemical cycles.
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