Article
Biodiversity Conservation
Marcus M. Key, Patrick N. Wyse Jackson, Catherine M. Reid
Summary: Research shows that Trepostome bryozoans were not passively responding to changes in seawater chemistry, but actively controlled the mineralogy and robustness of their skeletons. Despite being considered passive hypercalcifiers, their consistent degree of calcification suggests they were actually active biomineralizers.
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
(2022)
Article
Multidisciplinary Sciences
Deyanira Cisneros-Lazaro, Arthur Adams, Jinming Guo, Sylvain Bernard, Lukas P. Baumgartner, Damien Daval, Alain Baronnet, Olivier Grauby, Torsten Vennemann, Jaroslaw Stolarski, Stephane Escrig, Anders Meibom
Summary: This study investigates fluid-mediated isotopic exchange in pristine foraminifera tests and finds that even tests considered texturally pristine for paleo-climatic reconstruction purposes may have experienced substantial isotopic exchange, highlighting the need for critical re-examination of paleo-temperature records.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Biomedical
Zohar Eyal, Leilah Krounbi, Oz Ben Joseph, Emanuel M. Avrahami, Iddo Pinkas, Hadas Peled-Zehavi, Assaf Gal
Summary: Biomineralization processes exhibit varying levels of control over crystallization. Coccoliths, calcified scales formed by unicellular algae, are a model for highly controlled crystallization. This study explores the relationship between base plate and coccolith properties and reveals that the combination of base plate and the chemical environment inside the cell plays a pivotal role in the exquisite control over the crystallization process.
ACTA BIOMATERIALIA
(2022)
Article
Geosciences, Multidisciplinary
Sang Chen, Eloise F. M. Littley, James W. B. Rae, Christopher D. Charles, Jess F. Adkins
Summary: By studying the mechanisms of uranium incorporation in coral skeletons, the relationship between U/Ca in corals and environmental factors, as well as the alkalinity pump rates in coral biomineralization processes, this research reveals the behavior of U/Ca in coral skeletons.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geology
Netta Shalev, Tomaso R. R. Bontognali, Derek Vance
Summary: Recent studies have found that dolomite could potentially be used as an archive for studying ancient seawater Mg isotope values, but uncertainties remain around the factors influencing dolomite Mg isotopes. Research in a rare environment in Qatar suggests that pore water involved in dolomite formation may have higher delta Mg-26 values than seawater.
Article
Geosciences, Multidisciplinary
Pan Zhang, Kang-Jun Huang, Mao Luo, Yaoping Cai, Zhian Bao
Summary: The advent of animal biomineralization significantly changed the marine ecological system in the terminal Ediacaran period. The relationship between seawater Mg/Ca variation and animal biomineralization has been explored, and enhanced silicate weathering flux may have facilitated the skeletonization of early animals.
PRECAMBRIAN RESEARCH
(2022)
Review
Ecology
Nicola Conci, Sergio Vargas, Gert Woerheide
Summary: Octocorallia is a group of calcifying corals with diverse mineral skeletons, including aragonite and calcite; despite being overlooked, these corals are important for biomineralization studies; research on the mineralization strategies of octocorals is currently focused on a small set of species.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2021)
Article
Chemistry, Multidisciplinary
Marta de Frutos, Alejandro B. Rodriguez-Navarro, Xiaoyan Li, Antonio G. Checa
Summary: The majority of calcium carbonate biocrystals have a nanoroughness consisting of crystalline lumps surrounded by amorphous pellicles. Using STEM-EELS, the calcite secreted by a barnacle was mapped with ultrahigh resolution. The material is composed of irregular calcite lumps surrounded by cortexes of amorphous calcium carbonate and/or nanocalcite plus biomolecules. The separation of the crystalline and amorphous phases takes place during calcite crystallization from a precursor ACC, which differs from the previously established conception of biomineral structure and growth.
Article
Astronomy & Astrophysics
Piyush Sharda, Mark R. Krumholz
Summary: This paper investigates the thermodynamic evolution of collapsing, dusty gas clouds at different metallicities, showing the transition from a primordial regime to a modern regime and highlighting the key role of metallicity in driving variations in the characteristic stellar mass and the IMF.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Geochemistry & Geophysics
Dorota Kolbuk, Philippe Dubois, Jaroslaw Stolarski, Przemyslaw Gorzelak
Summary: The Mg/Ca ratio in echinoderm skeletons is influenced by seawater chemistry, indicating that fossil echinoderms may provide a record of paleoseawater Mg2+/Ca2+. While sea stars were not significantly stressed by decreased seawater Mg2+/Ca2+, brittle stars were affected in growth and mortality. Reconstruction of paleoseawater Mg2+/Ca2+ from fossil echinoderms is limited by variations in Mg partition coefficients among different species.
Article
Geosciences, Multidisciplinary
Bo Qiu, Shuiming Chen, Eitarou Oka
Summary: The Kuroshio south of Japan alternates between a straight and a large meander path. The ongoing meander is maintained by a stable dynamic state of the Kuroshio Extension forced by wind stresses across the Pacific. This stability not only minimizes disruptions to the upstream path of the Kuroshio, but also helps anchor it across the Izu Ridge.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Shuo Zhang, Donald J. DePaolo, Renjie Zhou, Yuefei Huang, Guangqian Wang
Summary: Predicting mineral-fluid reaction rates in geologic materials is highly uncertain, despite their importance in various applications. The slow calcite-fluid reaction in deep sea carbonate sediments remains poorly understood, as well as the persistence of non-zero rates over millions of years. This study examines pore fluid data from ocean drilling archives to estimate the rates of calcite dissolution and precipitation as a function of depth and sediment age.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Mebrahtu F. Weldeghebriel, Tim K. Lowenstein, Javier Garcia-Veigas, Dioni Cendon
Summary: Chemical analyses of fluid inclusions in marine halite were used to determine the concentrations of calcium ions and sulfate ions in paleoseawater over the past 550 million years. The study found oscillations in the concentrations of calcium ions and sulfate ions in ancient seawater, which were related to tectonic events, climate changes, and continental drift. The use of a new analysis method produced more accurate results that were consistent with other studies. The findings of this research are important for understanding the evolution of ancient marine environments and Earth's dynamic processes.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Mebrahtu F. Weldeghebriel, Tim K. Lowenstein, Zhiguang Xia, Weiqiang Li
Summary: Chemical analyses of fluid inclusions in halite samples were used to study the strontium concentrations in ancient seawater over the past 550 million years. The results show variations in strontium concentrations and ratios in seawater, with oscillations between high and low concentrations. These variations are related to changes in paleoseawater conditions and the presence of different mineral phases. The study also reveals different controls on the global strontium cycle during different time intervals.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Review
Construction & Building Technology
Daniel Mulu Mengistu, Asefa Niguse Mamo, Mesfin Tafesse Gemeda
Summary: This study focuses on the development of self-healing concrete using bacteria with calcite precipitation capacity to repair cracks and improve mechanical strength and quality of the concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)