Ikaite Abundance Controlled by Porewater Phosphorus Level: Potential Links to Dust and Productivity

Zhou, Xiaoli; Lu, Zunli; Rickaby, Rosalind E. M.; Domack, Eugene W.; Wellner, Julia S.; Kennedy, Hilary

doi:10.1086/681918

Cited by 44 publications

(30 citation statements)

References 66 publications

(82 reference statements)

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“…Bischoff et al . () found that phosphate was most effective in this respect and indeed significant phosphate levels are typical of modern ikaite occurrences (Huggett et al ., ; Selleck et al ., ; Zhou et al ., ). Ikaite is probably under‐diagnosed as a primary phase (Shearman & Smith, ; Bischoff et al ., ; Buchardt et al ., ) as borne out by new discoveries such as within sea ice (Fig.…”

Section: Facies Analysismentioning

confidence: 94%

Continental carbonate facies of a Neoproterozoic panglaciation, north‐east Svalbard

et al. 2016

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This is the peer reviewed version of the following article: Fairchild, I. J., Fleming, E. J., Bao, H., Benn, D. I., Boomer, I., Dublyansky, Y. V., Halverson, G. P., Hambrey, M., Hendy, C., Mcmillan, E. A., Sp?tl, C., Stevenson, C. T. E. & Wynn, P. M. (2015). Continental carbonate facies of a Neoproterozoic panglaciation, north-east Svalbard. Sedimentology., which has been published in final form at http://dx.doi.org/doi:10.1111/sed.12252. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.The Marinoan panglaciation (?650 to 635 Ma) is represented in north-east Svalbard by the 130 to 175 m thick Wilsonbreen Formation which contains syn-glacial carbonates in its upper 100 m. These sediments are now known to have been deposited under a CO2-rich atmosphere, late in the glaciation, and global climate models facilitate testing of proposed analogues. Precipitated carbonates occur in four of the seven facies associations identified: Fluvial Channel (including stromatolitic and intraclastic limestones in ephemeral stream deposits); Dolomitic Floodplain (dolomite-cemented sand and siltstones, and microbial dolomites); Calcareous Lake Margin (intraclastic dolomite and wave-rippled or aeolian siliciclastic facies); and Calcareous Lake (slump-folded and locally re-sedimented rhythmic/stromatolitic limestones and dolomites associated with ice-rafted sediment). There is no strong cyclicity, and modern analogues suggest that sudden changes in lake level may exert a strong control on facies geometry. Both calcite and dolomite in stromatolites and rhythmites display either primary or early diagenetic replacive growth. Oxygen isotope values (-12 to +15?VPDB) broadly covary with ?13C. High ?13C values of +3.5 to +4.5? correspond to equilibration with an atmosphere dominated by volcanically degassed CO2 with ?13C of -6 to -7?. Limestones have consistently negative ?18O values, whilst rhythmic and playa dolomites preserve intermediate compositions, and dolocretes possess slightly negative to strongly positive ?18O signatures, reflecting significant evaporation under hyperarid conditions. Inferred meltwater compositions (-8 to -15.5?) could reflect smaller Rayleigh fractionation related to more limited cooling than in modern polar regions. A common pseudomorph morphology is interpreted as a replacement of ikaite (CaCO3.H2O), which may also have been the precursor for widespread replacive calcite mosaics. Local dolomitization of lacustrine facies is interpreted to reflect microenvironments with fluctuating redox conditions. Although differing in (palaeo)latitude and carbonate abundance, the Wilsonbreen carbonates provide strong parallels with the McMurdo Dry Valleys of Antarctica.authorsversionpublishersversionPeer reviewe

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Section: Facies Analysismentioning

confidence: 94%

Continental carbonate facies of a Neoproterozoic panglaciation, north‐east Svalbard

et al. 2016

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“…If formed from an ikaite precursor, the presence of thinolite indicates a set of very specific environmental conditions at the lake bottom. Ikaite growth typically occurs in near-freezing (0 to 4°C) waters with high orthophosphate or Mg concentrations (Zhou et al, 2015), and ikaite removed from the stable temperature-pressure environment rapidly disintegrates into a mush of water and calcite (Bischoff et al, 1993a;Ito, 1998;Omelon et al, 2001). However, Purgstaller et al (2017) found that ikaite could be precipitated in laboratory conditions at water temperatures up to 12°C in solutions highly supersaturated with respect to ikaite.…”

Section: Water Temperature Indicators From Tufa Texturementioning

confidence: 99%

8200‐year growth history of a Lahontan‐age lacustrine tufa deposit

2019

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Tufa domes and towers are common around the margins of Winnemucca Dry Lake, Nevada, USA, a desiccated sub‐basin of pluvial Lake Lahontan. A 2·5 m diameter concentrically‐layered tufa mound from the southern end of the playa was sampled along its growth axis to determine timing, rate and geochemical conditions of tufa growth. A radiocarbon‐based age model indicates an 8200‐year tufa depositional record that begins near the end of the Last Glacial Maximum (ca 23 400 cal yr bp) and concludes at the end of the most recent Lahontan highstand (ca 15 200 cal yr bp). Petrography, stable isotopes and major and minor elemental compositions are used to evaluate the rate and timing of tufa growth in the context of the depositional environment. The deposit built radially outward from a central nucleation point, with six decimetre‐scale layers defined by variations in texture. Two distinct tufa types are observed: the inner section is composed of two layers of thinolite pseudomorphs after ikaite, with the innermost layer comprised of very small pseudomorphs (<0·25 cm) and an outer layer composed of larger, ca 3 cm long pseudomorphs, followed by a transitional layer where thinolite pseudomorphs grade into calcite fans. The outer section consists of three distinct layers of thrombolitic micrite with a branching mesofabric. The textural change occurred as lake levels began to rise towards the most recent Lahontan highstand interval and probably was prompted by warming of lake waters caused by increased groundwater flux during highstand lake levels. The Mg/Ca and Sr/Ca variations suggest a warming trend in the tufa growth environment and may also reflect increasing growth rates of tufa associated with increased fluxes of groundwater. This systematic study of tufa deposition indicates the importance of the hydrology of the lacustrine tufa system for reconstructing palaeoenvironmental records, and particularly the interaction of ground and surface waters.

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“…A second cooling event is thought to have occurred in the late Aptian, as a number of different proxies have indicated, e.g., d 18 O, TEX 86 , calcareous nannofossils (e.g., Herrle and Mutterlose, 2003;Mutterlose et al, 2009;McAnena et al, 2013;Bodin et al, 2015), and this is not inconsistent with our findings at Festningen. The first appearance of glendonites, which may be associated with cold water conditions (as well as specific chemical conditions; see Bischoff et al, 1993;De Lurio and Frakes, 1999;Rickaby et al, 2006;Selleck et al, 2007;and Zhou et al, 2015, for more detail), in the Carolinefjellet Formation at Festnin gen occurs at 655 m. Although macro-wood fossils above 580 m are sparse, so that using carbon-isotope stratigraphy to date their appearance more accurately is not possible, previous studies suggest that the Inkkjegla Member (in which the Carolinefjellet Formation glendonites occur) is late Aptian-early Albian in age (e.g., Nagy, 1970;Thusu, 1978; see Fig. 2).…”

Section: Record Of Climate Change In Svalbardmentioning

confidence: 99%

Stratigraphic and geochemical expression of Barremian–Aptian global climate change in Arctic Svalbard

et al. 2016

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Significant changes in global climate and carbon cycling occurred during the Early Cretaceous. This study examines the expression of such climatic events in high-latitude Svalbard together with the stratigraphic utility of carbon-isotope stratigraphies. Isotopic analysis of fossil wood fragments (from the Rurikfjellet, Helvetiafjellet, and Carolinefjellet formations, Festningen, Spitsbergen) record a distinctive pattern including a negative isotope excursion preceding a positive event, correlatable with the global early Aptian isotope event. Our carbon-isotope profile improves the stratigraphic correlation and relative dating of the succession. We show that the upper part of the Helvetia fjellet Formation was deposited during the early Aptian, and not the late Barremian, as previously thought. Furthermore, we estimate an age for the abrupt contact of the Rurikfjellet Formation with the overlying Helvetiafjellet Formation (associated with a pulse of igneous activity) to be ca. 129 Ma or ca. 124 Ma, depending on which age model for the Early Cretaceous is used. The well-known dinosaur footprints of the Helvetiafjellet Formation at Fest ningen are constrained to the middle Barremian and, coupled with floral data, support a warm late Barremian prior to the Aptian carbon-isotope event. The appearance of glendonites at 655 m in the Carolinefjellet Formation is consistent with global cooling in the late Aptian-early Albian.

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Ikaite Abundance Controlled by Porewater Phosphorus Level: Potential Links to Dust and Productivity

Cited by 44 publications

References 66 publications

Continental carbonate facies of a Neoproterozoic panglaciation, north‐east Svalbard

Continental carbonate facies of a Neoproterozoic panglaciation, north‐east Svalbard

8200‐year growth history of a Lahontan‐age lacustrine tufa deposit

Stratigraphic and geochemical expression of Barremian–Aptian global climate change in Arctic Svalbard

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