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DOI	10.1111/gbi.12344
	The importance of groundwater flow to the formation of modern thrombolitic microbialites
	Warden J.G.; Coshell L.; Rosen M.R.; Breecker D.O.; Ruthrof K.X.; Omelon C.R.
发表日期	2019
ISSN	14724677
起始页码	536
结束页码	550
卷号	17 期号:5
英文摘要	Modern microbialites are often located within groundwater discharge zones, yet the role of groundwater in microbialite accretion has yet to be resolved. To understand relationships between groundwater, microbialites, and associated microbial communities, we quantified and characterized groundwater flow and chemistry in active thrombolitic microbialites in Lake Clifton, Western Australia, and compared these observations to inactive thrombolites and lakebed sediments. Groundwater flows upward through an interconnected network of pores within the microstructure of active thrombolites, discharging directly from thrombolite heads into the lake. This upwelling groundwater is fresher than lake water and is hypothesized to support microbial mat growth by reducing salinity and providing limiting nutrients in an osmotically stressful and oligotrophic habitat. This is in contrast to inactive thrombolites that show no evidence of microbial mat colonization and are infiltrated by hypersaline lake water. Groundwater discharge through active thrombolites contrasts with the surrounding lakebed, where hypersaline lake water flows downward through sandy sediments at very low rates. Based on an appreciation for the role of microorganisms in thrombolite accretion, our findings suggest conditions favorable to thrombolite formation still exist in certain locations of Lake Clifton despite increasing lake water salinity. This study is the first to characterize groundwater flow rates, paths, and chemistry within a microbialite-forming environment and provides new insight into how groundwater can support microbial mats believed to contribute to microbialite formation in modern and ancient environments. © 2019 John Wiley & Sons Ltd
关键词	accretion groundwater flow microbial community microbialite microstructure salinity spring (hydrology)thrombolite Australia Lake Clifton Western Australia ground water bacterial phenomena and functions chemistry lake microalga physiology sediment water flow Western Australia Bacterial Physiological Phenomena Geologic Sediments Groundwater Lakes Microalgae Water Movements Western Australia
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133247
推荐引用方式 GB/T 7714	Warden J.G.,Coshell L.,Rosen M.R.,et al. The importance of groundwater flow to the formation of modern thrombolitic microbialites[J]. Geobiology,2019,17(5).
APA	Warden J.G.,Coshell L.,Rosen M.R.,Breecker D.O.,Ruthrof K.X.,&Omelon C.R..(2019).The importance of groundwater flow to the formation of modern thrombolitic microbialites.,17(5).
MLA	Warden J.G.,et al."The importance of groundwater flow to the formation of modern thrombolitic microbialites".17.5(2019).