https://scholars.lib.ntu.edu.tw/handle/123456789/542429
標題: | Fossil travertine system and its palaeofluid provenance, migration and evolution through time: Example from the geothermal area of Acquasanta Terme (Central Italy) | 作者: | Janssens, N. Capezzuoli, E. Claes, H. Muchez, P. Yu, T.-L. CHUAN-CHOU SHEN Ellam, R.M. |
公開日期: | 2020 | 卷: | 398 | 起(迄)頁: | - | 來源出版物: | Sedimentary Geology | 摘要: | The geothermal area of Acquasanta Terme has often been studied for its active and fossil travertine deposits to elucidate fluid origin, geodynamic and hydrological setting. Even though present-day thermal springs are usually used to obtain most information, the three travertine terraces bordering the Tronto river contain a plethora of information. A combination of elemental and isotope analyses (δ18O, δ13C and 87Sr/86Sr-ratio), fluid inclusion microthermometry and U[sbnd]Th dating is used to verify the hydrogeology and its timing. These analyses point out two fluid reservoirs with distinctly different fluids, one with low salinity of 0.7 wt% NaCl eq. and another with 28.5 wt% NaCl eq., which corresponds to the fluid composition of present-day spring fluids. Furthermore, it is demonstrated that geothermal sources were intermittently active in the past 221 ka mainly during uneven-numbered marine isotope stages, which are related to humid, interglacial periods and resulted in three different travertine terraces around 210.5, 126.5, and 36.5 ka. Accordingly, an uplift rate for this area could be estimated at around 1 mm/ka. The fluids were tapped at a depth of approximately 3 km in the tectonized, cataclastic fraction of the Triassic Anidriti di Burano Formation, the Calcare Cavernoso Formation and are originally meteoric based on geochemical evidence of a uniform 87Sr/86Sr-ratio of 0.707914 ± 0.00019 and a δ18Oaragonite value of −11.90 ± 0.34‰, which has been depressed by elevated precipitation temperatures between 22.2 and 50 °C. The characterization and dating of fossil travertine deposits gives valuable data providing insights in long-term fluid flow and orogenic uplift rates, adding valuable information to present-day spring fluid characterization. © 2019 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.url?eid=2-s2.0-85077658458&partnerID=40&md5=9eedef20f78367908f59051b29d3bfda https://scholars.lib.ntu.edu.tw/handle/123456789/542429 |
DOI: | 10.1016/j.sedgeo.2019.105580 | SDG/關鍵字: | Deposits; Geochemistry; Geothermal springs; Groundwater; Hydrogeology; Isotopes; Limestone; Mineralogy; Sodium chloride; Apennines; Fluid characterization; Fluid inclusion; Fluid inclusion microthermometry; Geochemical evidence; Marine isotope stages; Precipitation temperature; Travertine; Flow of fluids; fluid inclusion; fossil; geochemistry; geothermal system; hydrogeology; marine isotope stage; provenance; sediment transport; thorium; travertine; uranium series dating; Acquasanta Terme; Apennines; Ascoli Piceno; Italy; Marche |
顯示於: | 地質科學系 |
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