Carbonate precipitation in the alkaline lake Specchio di Venere (Pantelleria Island, Italy) and the possible role of microbial mats

Cangemi, Marianna; Censi, P.; Reimer, Andreas; D’Alessandro, W.; Hause-Reitner, Dorothea; Madonia, Paolo; Oliveri, Ygor; Pecoraino, Giovannella; Reitner, Joachim

doi:10.1016/j.apgeochem.2016.02.012

Cited by 40 publications

(24 citation statements)

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“…The saturation index (SI) is defined as the decadic logarithm of the quotient of the ion activity product and the mass balance constant (Kaźmierczak et al, 2011). The SI of aragonite, calcite, dolomite, magnesite, artinite, huntite, nesquehonite, and hydromagnesite for the studied water samples is given in for Lake Alchichica, Mexico and Lake Specchio di Vennere, Italy (Kaźmierczak et al, 2011;Cangemi, et al, 2016). Cangemi et al (2016) supposed that hydromagnesite saturation depends on the temperature at the base of the saturation, switching from undersaturation during cold months to supersaturation when lake waters warm up in the summer season.…”

Section: Water Hydrochemistrymentioning

confidence: 99%

“…The high δ 18 O values of the samples are similar to the δ 18 O range for hydromagnesite-rich deposits in modern evaporitic environments (Braithwaite and Zedef, 1996;Oskierski et al, 2013), and clearly indicate that lake water precipitating hydromagnesite at Dujiali is subject to rapid evaporation. Wilson (2010) (Clark and Fritz, 1997;Cangemi et al, 2016).…”

Section: Carbon and Oxygen Isotopesmentioning

confidence: 99%

“…In addition, hydromagnesite has also been found in many alkaline lakes in the world, where it presents a particular interest as a biomineral that precipitates in microbial mats and stromatolites in alkaline lakes, such as Lake Specchio di Venere in Italy, Salda Lake in Turkey, British Columbia lakes, Alchichica Lake in Mexico (e.g. Renaut and long, 1989;Thompson et al, 1990;Braithwaite and Zedef, 1994;Power et al, 2007;Kaźmierczak et al, 2009;Cangemi et al, 2016), or is stratabound in lakes such as Pangkog tso, Selin Co, and Dujiali lakes in Tibet (Zheng et al, 1989(Zheng et al, , 1997. The hydromagnesite mineralogy of modern and ancient playas is variable and complex, consequently there continue to be uncertainties.…”

Section: Introductionmentioning

confidence: 99%

“…Carbonate precipitation can be fostered either by physical-chemical or metabolic processes such as photosynthesis and sulfate reduction (Cangemi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…However, from the limited study of hydromagnesite in saline lakes, deposition appears to be associated with microbial activity (Braithwaite and Zedef, 1996;Power et al, 2009Power et al, , 2014Cangemi et al, 2016). Braithwaite and Zedef (1996) proposed bio-mediated precipitation of hydromagnesite with atmospheric origin for Salda Lake, Turkey.…”

Section: Introductionmentioning

confidence: 99%

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Hydromagnesite precipitation in the Alkaline Lake Dujiali, central Qinghai-Tibetan Plateau: Constraints on hydromagnesite precipitation from hydrochemistry and stable isotopes

Lin

Zheng

2017

Applied Geochemistry

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The mineral hydromagnesite, Mg 5 (CO 3) 4 (OH) 2 •4H 2 O, is a common form of hydrated Mg-carbonate in alkaline lakes, yet the processes involved in its formation are not well understood. This study focuses on Dujiali Lake, in the central Qinghai-Tibetan Plateau (QTP), which is one of the few environments on the earth's surface with extensive Holocene precipitation of hydromagnesite. The hydrogeochemistry of surface waters, and the mineralogical, stable isotope (δ 13 C and δ 18 O), and radiogenic isotope content of hydromagnesite deposits were analyzed to investigate formation mechanisms. The chemical composition of surface water around Dujiali Lake evolved from the rock-weathering-type waters of T1 (Ca-Mg-HCO 3 water type) to more concentrated sodic waters of T2 (Na-SO 4-Cl water type) due to evaporation. XRD results show that the mineralogical composition of samples is pure hydromagnesite. Analysis of oxygen isotopes in the hydromagnesite indicates that supergene formation with authigenic carbonate crystallization from evaporation water is the dominant precipitation process. Combined carbon-oxygen isotope analysis suggests atmospheric CO 2 provided a carbon source for the precipitation of hydromagnesite. These findings suggest that hydromagnesite precipitation at Lake Dujiali is mainly inorganic in nature, and the greenhouse gas, CO 2 , is trapped and stored in the hydromagnesite directly from the atmosphere. AMS radiocarbon dating of samples indicates CO 2 was sequestered between 5845±30 to 6090±25 cal a BP in the Dujiali Lake hydromagnesite deposit. The study contributes to improved understanding of hydromagnesite formation in modern and ancient playas.

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Section: Water Hydrochemistrymentioning

confidence: 99%

Section: Carbon and Oxygen Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Carbonate precipitation can be fostered either by physical-chemical or metabolic processes such as photosynthesis and sulfate reduction (Cangemi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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