气候变化领域集成服务门户(CCPortal): Linking CO2 degassing in active fault zones to long-term changes in water balance and surface water circulation; an example from SW Turkey

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DOI	10.1016/j.quascirev.2019.04.029
	Linking CO2 degassing in active fault zones to long-term changes in water balance and surface water circulation; an example from SW Turkey
	Uysal I.T.; Ünal-İmer E.; Shulmeister J.; Zhao J.-X.; Karabacak V.; Feng Y.-X.; Bolhar R.
发表日期	2019
ISSN	0277-3791
起始页码	164
结束页码	177
卷号	214
英文摘要	Calcite veins are commonly found at shallow depth (a few metres below the surface) in damage zones of active normal fault systems in southwest Turkey. Although earlier studies demonstrated the link between the vein formation and seismicity, the association of near-surface carbonate precipitation with climate-driven hydrological conditions (water table, amount of precipitation and evaporation, and water discharge) is poorly understood. In this study, using the U/Th dating method we investigate the timing of vein formation and the interrelationship between tectonic and climatic-related hydrological processes. Carbonate precipitation is interpreted to occur as a result of sudden pressure drops and CO2 release after earthquake-induced fracturing. Vein formation mostly occurred during glacial periods, which coincide with slow growth rates and higher oxygen isotope values of speleothems from the Eastern Mediterranean region. We relate these episodes to reduced winter rainfall due to the decrease in westerly flow in SW Turkey. These somewhat drier conditions influenced the chemical composition of circulating water, creating conditions conducive to carbonate precipitation and sealing of damage zones. These conditions also facilitated CO2 accumulation and overpressure build-up in the rupture zones. Failure of the faults resulted in the release of large volumes of CO2-rich fluids and the generation of shallow carbonate veins. It is proposed that during phases of increased winter rainfall CO2 is advected to the surface and discharged as passive degassing when meteoric water circulation is enhanced. While regional tectonics is the ultimate driver of fault activity and fracture formation, climate-driven near-surface hydrological changes may have played an important role in modulating CO2-rich fluid circulation and surface discharge. © 2019
英文关键词	Carbonate; CO2 degassing; Paleohydrology; Seismicity; U-series dating; Veins/breccia
语种	英语
scopus关键词	Calcite; Carbon dioxide; Carbonates; Carbonation; Degassing; Groundwater; Rain; Structural geology; Surface waters; Carbonate precipitation; Eastern Mediterranean; Hydrological condition; Oxygen isotope values; Paleo-hydrology; Seismicity; U-series dating; Veins/breccia; Faulting; active fault; breccia; carbonate rock; chemical composition; dating method; degassing; fault zone; long-term change; meteoric water; normal fault; paleohydrology; precipitation (chemistry); speleothem; surface water; vein (geology); water budget; westerly; Turkey
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151918
作者单位	Commonwealth Scientific and Industrial Research Organisation, CSIRO, Perth, Australia; School of Earth and Environmental Sciences, The University of Queensland, Brisbane, Australia; Department of Geological Engineering, Middle East Technical University, Ankara, Turkey; Department of Geological Engineering, Eskisehir Osmangazi University, Eskisehir, Turkey; School of Geosciences, University of the Witwatersrand, South Africa
推荐引用方式 GB/T 7714	Uysal I.T.,Ünal-İmer E.,Shulmeister J.,et al. Linking CO2 degassing in active fault zones to long-term changes in water balance and surface water circulation; an example from SW Turkey[J],2019,214.
APA	Uysal I.T..,Ünal-İmer E..,Shulmeister J..,Zhao J.-X..,Karabacak V..,...&Bolhar R..(2019).Linking CO2 degassing in active fault zones to long-term changes in water balance and surface water circulation; an example from SW Turkey.Quaternary Science Reviews,214.
MLA	Uysal I.T.,et al."Linking CO2 degassing in active fault zones to long-term changes in water balance and surface water circulation; an example from SW Turkey".Quaternary Science Reviews 214(2019).