Christian Scholz

Christian Scholz
Universität Heidelberg · Institute of Earth Sciences

Diplom

About

33
Publications
7,356
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809
Citations
Citations since 2017
23 Research Items
297 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
Introduction
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Publications

Publications (33)
Preprint
Full-text available
Hells Bells are underwater secondary carbonates discovered in sinkholes (cenotes) southeast of Cancun on the north-eastern Yucatán peninsula, Mexico. These authigenic calcite precipitates, reaching a length of up to 4 m, most likely grow in the pelagic redoxcline. Here we report on detailed ²³⁰ Th/U-dating and in-depth geochemical and stable isotop...
Article
Cover Caption: The cover image is based on the Research Article Microbially promoted calcite precipitation in the pelagic redoxcline: Elucidating the formation of the turbid layer by Kerstin M. Leberecht, et al., https://doi.org/10.1111/gbi.12492
Article
Full-text available
Large bell‐shaped calcite formations called “Hells Bells” were discovered underwater in the stratified cenote El Zapote on the Yucatán Peninsula, Mexico. Together with these extraordinary speleothems, divers found a white, cloudy turbid layer into which some Hells Bells partially extend. Here, we address the central question if the formation of the...
Preprint
Full-text available
Hells Bells are underwater secondary carbonates discovered in sinkholes (cenotes) southeast of Cancun on the north-eastern Yucatán Peninsula, Mexico. These authigenic calcite precipitates, reaching a length of up to 4 m, most likely grow in the pelagic redoxcline. Here, we report on detailed 230Th/U-dating and in-depth geochemical and stable isotop...
Article
Full-text available
Silver nanoparticles (AgNPs) have attracted attention in cancer therapy and might support the treatment of pancreatic ductal adenocarcinoma (PDAC). Silver is in clinical use in wound dressings, catheters, stents and implants. However, the side effects of systemic AgNP treatment due to silver accumulation limit its therapeutic application. We evalua...
Article
This data set compiles the results of water chemical analyses as well as bulk chemical analyses of the particles suspended in the water columns of cenotes (sinkholes) obtained during a sampling campaign in Mexico in February 2020. Three stratified cenotes from North-Eastern Yucatán Peninsula were investigated: El Zapote and Siete Bocas with Hells B...
Presentation
Prior studies indicated that Hells Bells-like underwater speleothems might occur in the sinkhole (cenote) Xkolac in Yucatán, Mexico (Ritter S.M, 2020). In order to verify, the cenote was explored in February 2020 by a team of five divers and four scientists. Below ~52 m water depth, the limestone walls actually revealed brownish calcitic coatings f...
Article
Full-text available
Arsenic (As) contamination of groundwater is commonly remediated by pump and treat. However, this technique is difficult to apply or maintain efficiently because the mobility of arsenic varies depending on the geochemical aquifer conditions. Arsenic interacting with the sediment can cause strong retardation, which is counteracted by ions competing...
Article
Full-text available
Unique bell-shaped underwater speleothems were recently reported from the deep (∼ 55 m) meromictic El Za-pote sinkhole (cenote) on the Yucatán Peninsula, Mexico. The local diving community has termed these speleothems as Hells Bells because of their shape and appearance in a dark environment in ∼ 28-38 m water depth above a sulfidic halocline. It w...
Preprint
Full-text available
Unique bell-shaped underwater speleothems were recently reported from the deep (~55 m) meromictic El Zapote sinkhole (cenote) on the Yucatán Peninsula, Mexico. The local diving community has termed these speleothems as Hells Bells because of their shape and appearance in a lightless environment in ~28-38 m water depth above a sulfidic halocline. It...
Article
Full-text available
The late Pliocene/early Pleistocene intensification of Northern Hemisphere glaciation (iNHG) ∼ 2.5 million years ago (marine isotope stages, MIS, 100–96) stands out as an important tipping point in Earth's climate history, which strongly influenced oceanographic and climatic patterns including trade wind and upwelling strength in the eastern equato...
Article
The formation of tufa is essentially influenced by biological processes and, in order to infer environmental information from tufa deposits, it has to be determined how the geochemistry of biologically influenced tufa deviates from equilibrium conditions between water and calcite precipitate. We investigated the evolution of the water and tufa geoc...
Conference Paper
Full-text available
Voruntersuchungen zur Einspeicherung von Wärme (ATES) in einen oberflächennahen Aquifer im nördlichen Oberrheingraben Ritter, S.; Isenbeck-Schröter M.; Khan, W.; Bauer, L.; Scholz, C.; Metzler, E.
Article
Full-text available
The late Pliocene/early Pleistocene intensification of Northern Hemisphere Glaciation (iNHG) ~ 2.5 million years ago (Marine Isotope Stages [MIS] 100–96) stands out as the most recent major tipping point in Earth's climate history. It strongly influenced oceanographic and climatic patterns including trade-wind and upwelling strength in the Eastern...
Article
Full-text available
Calcareous tufa deposition in bicarbonate-rich karstic spring waters is essentially linked to complex microbiological communities that alter the geochemistry of the deposited tufa and hydrochemistry of the creek water. A monthly monitoring of the creek water chemistry of a natural tufa depositing site in the Franconian Alb in southern Germany refle...
Article
Full-text available
In order to evaluate an inefficient pump & treat remediation at a contaminated site in Germany, processes of arsenic release into groundwater were studied. Groundwater and aquifer material sampling indicated elevated mobility of arsenic and a differentiated spatial distribution of As(V) and As(III). An artificial increase of arsenic mobilization in...
Presentation
Full-text available
Sr-Isotopie in Grundwässern des Oberrheingrabens (Raum Freiburg und Groß Gerau)
Article
Substrates containing an aryl iodide and an allenoate ester undergo gold-induced cycloisomerization to vinylgold(I) species (III) which are further converted into tricyclic product (IV) by intramolecular palladium-catalyzed cross-coupling reactions.
Article
Two substrates containing an aryl iodide and an allenoate ester were prepared and the gold‐induced cycloisomerisation to vinylgold(I) species and their proto‐deauration as well as the intramolecular palladium‐catalysed cross‐coupling reactions were investigated. Switching to catalytic amounts of gold and palladium and stoichiometric amounts of silv...
Article
To study transport and reactions of arsenic under field conditions, a small-scale tracer test was performed in an anoxic, iron-reducing zone of a sandy aquifer at the USGS research site on Cape Cod, Massachusetts, USA. For four weeks, a stream of groundwater with added As(V) (6.7 muM) and bromide (1.6 mM), was injected in order to observe the reduc...
Article
A simple, robust and reliable analytical procedure for the determination of Al, Ca, Fe, K, Li, Mg, Mn, Na, Sr, Ti, and Zn in peat and plant materials by inductively coupled plasma-optical emission spectrometry (ICP-OES) was developed. A microwave heated high pressure autoclave was used to digest powdered sample aliquots (approximately 200 mg) with...
Article
Full-text available
For detailed reconstructions of atmospheric metal deposition using peat cores from bogs, a comprehensive protocol for working with peat cores is proposed. The first step is to locate and determine suitable sampling sites in accordance with the principal goal of the study, the period of time of interest and the precision required. Using the state of...
Article
In der vorliegenden Untersuchung wird die Abhängigkeit der Speziesverteilung von Arsen im Grundwasser vom Redoxmilieu und ovn der As-Eintragsform betrachtet. Wasserproben von vier verschiedenen Lokalitäten mit fünf unterschiedlichen Eintragsquellen wurden auf Arsen (III), Gesamtarsen sowie weitere charakteristische geochemische Parameter analysiert...
Article
Full-text available
Binding forms of mercury (Hg) in contaminated soils were studied by means of a pyrolysis method and a sequential leaching procedure (SEP). Changes of the Hg-binding forms occurring during the sequential extraction procedure were characterized by determination of the thermal mercury release characteristics after each extraction step. Soil samples we...
Article
The species distribution of arsenic in groundwater is controlled by the geochemical conditions in particular the redox environment. Water samples characterized in the study originated from four locations and five different input sources. The redox conditions varied from oxic to sulfidic. Measurements indicate -as was expected- that the As(III))/As(...

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Projects

Project (1)
Project
In this project we investigate unique bell-shaped speleothems from sinkholes of the Yucatán Peninsula in Mexico. The main research questions are: How and for how long do these structures grow underwater? What is the mechanism that drives calcite precipitation underwater? Can Hells Bells be a useful geoarchive?