The soda lake—mesosaline halite lake transition in the Ries impact crater basin (drilling Löpsingen 2012, Miocene, southern Germany)

Arp, Gernot; Hansen, Bent; Pack, Andreas; Reimer, Andreas; Schmidt, Burkhard; Simon, Klaus; Jung, Dietmar

doi:10.1007/s10347-016-0483-7

Cited by 12 publications

(16 citation statements)

References 37 publications

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“…The laminite member is followed by a greenish-gray poorly stratified marlstone (marl member), which has been interpreted as evidence of shallowing (10). The marlstone is capped by a gray claystone with thin allochthonous coal seams as well as gypsum pseudomorphs that likely represent highly fluctuating water depths and salinities (24). We selected samples from the top of the basal member to the middle of the clay member with a resolution of a few meters (Table 1).…”

Section: Samplingmentioning

confidence: 99%

Nitrogen isotope ratios trace high-pH conditions in a terrestrial Mars analog site

et al. 2020

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High-pH alkaline lakes are among the most productive ecosystems on Earth and prime targets in the search for life on Mars; however, a robust proxy for such settings does not yet exist. Nitrogen isotope fractionation resulting from NH3 volatilization at high pH has the potential to fill this gap. To validate this idea, we analyzed samples from the Nördlinger Ries, a Miocene impact crater lake that displayed pH values up to 9.8 as inferred from mineralogy and aqueous modeling. Our data show a peak in δ15N of +17‰ in the most alkaline facies, followed by a gradual decline to around +5‰, concurrent with the proposed decline in pH, highlighting the utility of nitrogen isotopes as a proxy for high-pH conditions. In combination with independent mineralogical indicators for high alkalinity, nitrogen isotopes can provide much-needed quantitative constraints on ancient atmospheric Pco2 (partial pressure of CO2) and thus climatic controls on early Earth and Mars.

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Section: Samplingmentioning

confidence: 99%

Nitrogen isotope ratios trace high-pH conditions in a terrestrial Mars analog site

et al. 2020

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“…Climate: semi-arid to arid. Deposits: supralitoral carbonate swamps and pedogenic carbonates, spring mounds, eulitoral coated grains, microbialites (including stromatolites) and algal bioherms, speleothems Dissolution, micritisation, shrinkage, neomorphism, replacement, cementation Riding (1979), Arp (1995), Pache et al (2001), Arp et al (2013aArp et al ( , 2013bArp et al ( , 2017 Mono Lake (CA, USA) Pleistocene to Recent, endorheic alkaline lake located in an extensional, active volcanic basin near the Sierra Nevada (T: 1.5-23°C; pH: 9.7-10; salinity: N 90%; Alkalinity: 600-700 meq/L; Mg/Ca: 14). Climate: Mediterranean continental to subarctic.…”

Section: Tablementioning

confidence: 99%

What do we really know about early diagenesis of non-marine carbonates?

Boever

Brasier

Foubert

et al. 2017

Sedimentary Geology

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Non-marine carbonate rocks including cave, spring, stream, calcrete and lacustrine-palustrine sediments, are susceptible to early diagenetic processes. These can profoundly alter the carbonate fabric and affect paleoclimatic proxies. This review integrates recent insights into diagenesis of non-marine carbonates and in particular the variety of early diagenetic processes, and presents a conceptual framework to address them. With ability to study at smaller and smaller scales, down to nanometers, one can now observe diagenesis taking place the moment initial precipitates have formed, and continuing thereafter. Diagenesis may affect whole rocks, but it typically starts in nano-and micro-environments. The potential for diagenetic alteration depends on the reactivity of the initial precipitate, commonly being metastable phases like vaterite, Ca-oxalates, hydrous Mg-carbonates and aragonite with regard to the ambient fluid. Furthermore, organic compounds commonly play a crucial role in hosting these early transformations. Processes like neomorphism (inversion and recrystallization), cementation and replacement generally result in an overall coarsening of the fabric and homogenization of the wide range of complex, primary microtextures. If early diagenetic modifications are completed in a short time span compared to the (annual to millennial) time scale of interest, then recorded paleoenvironmental signals and trends could still acceptably reflect original, depositional conditions. However, even compact, non-marine carbonate deposits may behave locally and temporarily as open systems to crystal-fluid exchange and overprinting of one or more geochemical proxies is not unexpected. Looking to the future, relatively few studies have examined the behaviour of promising geochemical records, such as clumped isotope thermometry and (non-conventional) stable isotopes, in well-constrained diagenetic settings. Ongoing and future in-vitro and in-situ experimental approaches will help to investigate and detangle sequences of intermediate, diagenetic products, processes and controls, and to quantify rates of early diagenesis, bridging a gap between nanoscale, molecular lab studies and the fossil field rock record of non-marine carbonates.

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“…(B) Covariation plot of stable carbon and oxygen isotopes of reference material. Miocene caliche carbonates from the Franconian Alb (Hofstetten, Langenaltheim) and NAFB (Burgau), the Miocene Ries impact crater lake carbonates (Arp et al ., 2017a,b), the Miocene Lake Bicorb subunit C (Spain; Utrilla et al ., 1998), Upper Jurassic marine limestone (Southern Germany; Ruf et al ., 2005), and present‐day fluvial tufa (Franconian Alb; Arp et al ., 2001).…”

Section: Resultsmentioning

confidence: 99%

“…This isotopic pattern neither fits to hydrologically closed lakes showing a clear covariation (e.g. Talbot, 1990; Li & Ku, 1997; Utrilla et al ., 1998; Arp et al ., 2017a,b), nor to hydrologically open lakes, which are characterized by cloud‐like δ 13 C–δ 18 O patterns (e.g. Last et al ., 1994; Utrilla et al ., 1998; Hammarlund et al ., 2003; Benavente et al ., 2019) (Fig.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Sedimentological and carbonate isotope signatures to identify fluvial processes and catchment changes in a supposed impact ejecta‐dammed lake (Miocene, Germany)

Zeng

Ruge

Berger³

et al. 2021

Sedimentology

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The identification and distinction of fluvial from lacustrine deposits and the recognition of catchment changes are crucial for the reconstruction of climate changes in terrestrial environments. The investigated drill core succession shows a general evolution from red-brown claystones to white-grey marlstones and microcrystalline limestones, which all have previously been considered as relict deposits of an impact ejecta-dammed lake, falling within the mid-Miocene Climate Transition. However, recent mammal biostratigraphic dating suggests a likely pre-impact age. Indeed, no pebbles from impact ejecta have been detected; only local clasts of Mesozoic formations, in addition to rare Palaeozoic lydites from outside of the study area. Lithofacies analysis demonstrates only the absence of lacustrine criteria, except for one charophyte-bearing mudstone. Instead, the succession is characterized by less diagnostic floodplain fines with palaeosols, palustrine limestones with root voids and intercalated thin sandstone beds. Carbonate isotope signatures of the mottled marlstones, palustrine limestones and mud-supported conglomerates substantiate the interpretation of a fluvial setting. Low, invariant d 18 O carb reflects a short water residence time and highly variable d 13 C carb indicates a variable degree of pedogenesis. Carbonate 87 Sr/ 86 Sr ratios of the entire succession show a unidirectional trend from 0.7103 to 0.7112, indicating a change of the solute provenance from Triassic to Jurassic rocks, identical to the provenance trend from extraclasts. The increase in carbonate along the succession is therefore independent from climate changes but reflects a base-level rise from the level of the siliciclastic Upper Triassic to the carbonate-bearing Lower to Middle Jurassic bedrocks. This study demonstrates that, when information on sedimentary architecture is limited, a combination of facies criteria (i.e. presence or absence of specific sedimentary structures and diagnostic organisms), component provenance, and stable and radiogenic isotopes is required to unequivocally distinguish between lacustrine and fluvial sediments, and to disentangle regional geological effects in the catchment and climate influences.

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The soda lake—mesosaline halite lake transition in the Ries impact crater basin (drilling Löpsingen 2012, Miocene, southern Germany)

Cited by 12 publications

References 37 publications

Nitrogen isotope ratios trace high-pH conditions in a terrestrial Mars analog site

Nitrogen isotope ratios trace high-pH conditions in a terrestrial Mars analog site

What do we really know about early diagenesis of non-marine carbonates?

Sedimentological and carbonate isotope signatures to identify fluvial processes and catchment changes in a supposed impact ejecta‐dammed lake (Miocene, Germany)

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