ORCID Profile
0000-0002-4156-3841
Current Organisation
Universiteit Utrecht
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Publisher: American Geophysical Union (AGU)
Date: 07-2023
DOI: 10.1029/2023JB026890
Abstract: Editors of JGR‐Solid Earth express their appreciation to those who served as peer reviewers for the journal in 2022.
Publisher: Science Target, Inc.
Date: 02-2017
Publisher: Oxford University Press (OUP)
Date: 08-2009
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 04-2010
Publisher: American Geophysical Union (AGU)
Date: 19-05-2012
DOI: 10.1029/2012GC004063
Publisher: American Geophysical Union (AGU)
Date: 08-2014
DOI: 10.1002/2014JB011213
Publisher: Oxford University Press (OUP)
Date: 2002
Publisher: American Geophysical Union (AGU)
Date: 05-2021
DOI: 10.1029/2021JB022351
Abstract: The editors of JGR: Solid Earth announce that Plain Language Summaries will be required for all manuscripts.
Publisher: Elsevier BV
Date: 02-2015
Publisher: Springer Science and Business Media LLC
Date: 26-07-2016
DOI: 10.1038/SREP30395
Abstract: Hematite and goethite are the two most abundant iron oxides in natural environments. Their formation is controlled by multiple environmental factors therefore, their relative concentration has been used widely to indicate climatic variations. In this study, we aimed to test whether hematite and goethite growth is influenced by ambient magnetic fields of Earth-like values. Ferrihydrite was aged at 95 °C in magnetic fields ranging from ~0 to ~100 μT. Our results indicate a large influence of the applied magnetic field on hematite and goethite growth from ferrihydrite. The synthesized products are a mixture of hematite and goethite for field intensities ~60 μT. Higher fields favour hematite formation by accelerating ferrimagnetic ferrihydrite aggregation. Additionally, hematite particles growing in a controlled magnetic field of ~100 μT appear to be arranged in chains, which may be reduced to magnetite keeping its original configuration, therefore, the presence of magnetic particles in chains in natural sediments cannot be used as an exclusive indicator of biogenic magnetite. Hematite vs. goethite formation in our experiments is influenced by field intensity values within the range of geomagnetic field variability. Thus, geomagnetic field intensity could be a source of variation when using iron (oxyhydr-)oxide concentrations in environmental magnetism.
Publisher: Elsevier BV
Date: 2017
Publisher: American Geophysical Union (AGU)
Date: 12-2008
DOI: 10.1029/2008GC002127
Publisher: Springer Science and Business Media LLC
Date: 2003
Publisher: American Geophysical Union (AGU)
Date: 12-2013
DOI: 10.1002/2013JB010381
Publisher: Elsevier BV
Date: 12-2000
Publisher: American Geophysical Union (AGU)
Date: 08-2014
DOI: 10.1002/2014GC005343
Publisher: Oxford University Press (OUP)
Date: 07-1993
Publisher: Oxford University Press (OUP)
Date: 04-2004
Publisher: Elsevier BV
Date: 07-2001
Publisher: Elsevier BV
Date: 09-2002
Publisher: American Geophysical Union (AGU)
Date: 06-2014
DOI: 10.1002/2014GC005294
Publisher: Elsevier BV
Date: 03-2002
Publisher: American Geophysical Union (AGU)
Date: 03-2021
DOI: 10.1029/2021JB021896
Abstract: Members of the editorial board of JGR‐Solid Earth express their appreciation to those who served as peer reviewers for the journal in 2020.
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 06-2016
Publisher: Springer Science and Business Media LLC
Date: 26-11-2021
DOI: 10.1038/S41467-021-27054-5
Abstract: Across the Miocene–Pliocene boundary (MPB 5.3 million years ago, Ma), late Miocene cooling gave way to the early-to-middle Pliocene Warm Period. This transition, across which atmospheric CO 2 concentrations increased to levels similar to present, holds potential for deciphering regional climate responses in Asia—currently home to more than half of the world’s population— to global climate change. Here we find that CO 2 -induced MPB warming both increased summer monsoon moisture transport over East Asia, and enhanced aridification over large parts of Central Asia by increasing evaporation, based on integration of our ~1–2-thousand-year (kyr) resolution summer monsoon records from the Chinese Loess Plateau aeolian red clay with existing terrestrial records, land-sea correlations, and climate model simulations. Our results offer palaeoclimate-based support for ‘wet-gets-wetter and dry-gets-drier’ projections of future regional hydroclimate responses to sustained anthropogenic forcing. Moreover, our high-resolution monsoon records reveal a dynamic response to eccentricity modulation of solar insolation, with predominant 405-kyr and ~100-kyr periodicities between 8.1 and 3.4 Ma.
Publisher: American Geophysical Union (AGU)
Date: 24-01-2022
DOI: 10.1029/2020RG000698
Abstract: Hematite is a canted antiferromagnet with reddish color that occurs widely on Earth and Mars. Identification and quantification of hematite is conveniently achieved through its magnetic and color properties. Hematite characteristics and content are indispensable ingredients in studies of the iron cycle, paleoenvironmental evolution, paleogeographic reconstructions, and comparative planetology (e.g., Mars). However, the existing magnetic and color reflectance property framework for hematite is based largely on stoichiometric hematite and tends to neglect the effects of cation substitution, which occurs widely in natural hematite and influences the physical properties of hematite. Thus, magnetic parameters for stoichiometric hematite are insufficient for complete analysis of many natural hematite occurrences and can lead to ambiguous geological interpretations. Remagnetization, which occurs pervasively in red beds, is another ticklish problem involving hematite. Understanding red bed remagnetization requires investigation of hematite's formation and remanence recording mechanisms. We elaborate on the influence of cation substitution on the magnetic and color spectral properties of hematite, and on identifying hematite and quantifying its content in soils and sediments. Studies of remagnetization mechanisms are discussed, and we summarize methods to discriminate between primary and secondary remanences carried by hematite in natural s les to aid primary remanence extraction in partially remagnetized red beds. Although there remain unknown properties and unresolved issues that require future work, recognition of the properties of cation‐substituted hematite and remagnetization mechanisms for hematite will aid identification and interpretation of the magnetic signals that it carries, which is environmentally important and responsible for magnetic signals on Earth and Mars.
Publisher: Elsevier BV
Date: 2010
Publisher: American Geophysical Union (AGU)
Date: 04-2022
DOI: 10.1029/2022JB024501
Abstract: Editors of JGR‐Solid Earth express their appreciation to those who served as peer reviewers for the journal in 2021.
Publisher: Elsevier BV
Date: 04-2011
Publisher: Springer Science and Business Media LLC
Date: 16-10-2020
DOI: 10.1038/S41467-020-18824-8
Abstract: The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene–Oligocene transition (EOT): the EOT-1 cooling event at ~34.1–33.9 Ma and the Oi-1 glaciation event at ~33.8–33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic and geochemical climate records from the northeastern Tibetan Plateau margin that are dated precisely from ~35.5 to 31 Ma by combined magneto- and astro-chronology. These records suggest a hydroclimate transition at ~33.7 Ma from eccentricity dominated cycles to oscillations paced by a combination of eccentricity, obliquity, and precession, and confirm that major Asian aridification and cooling occurred at Oi-1. We conclude that this terrestrial orbital response transition coincided with a similar transition in the marine benthic δ 18 O record for global ice volume and deep-sea temperature variations. The dramatic reorganization of the Asian climate system coincident with Oi-1 was, thus, a response to coeval atmospheric CO 2 decline and continental-scale Antarctic glaciation.
No related grants have been discovered for Mark Dekkers.