Article
Geology
Hamzeh Mehrabi, Amin Navidtalab, Hossain Rahimpour-Bonab, Ulrich Heimhofer
Summary: Providing a chronostratigraphic framework often faces challenges in shallow-marine carbonates with poor biostratigraphic resolution. This study demonstrates the integration of geochemical, sedimentological, and paleontological data to construct a reliable sequence stratigraphic framework in Cenomanian-Santonian neritic carbonates in SW Iran. The study highlights the diagenetic and geochemical expressions of paleoexposure surfaces and provides insights into the identification of erosional sequence boundaries using elemental concentrations, isotopic ratios, and Sr/Rb ratios. The study also reveals the durations of hiatuses and their correlation with other neritic sections in the region.
CRETACEOUS RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Eduardo Premaor, Elizabete P. Ferreira, Paulo A. Souza, G. Raquel Guerstein, Mitsuru Arai
Summary: This study conducted taxonomic and biochronostratigraphic analyses of dinoflagellate cysts from 26 cutting samples from well 1-SCS-2 in the northern part of the Pelotas Basin, revealing that the palynological assemblages are composed of continental and marine taxa, dominated by dinoflagellate cysts. Six palynochronostratigraphic intervals were defined in the sediments of the Imbe acute accent Formation and the Cidreira Formation.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Xiuyan Liu, Honghan Chen, Xiaoshui Mu, Hongan Zhang, Junjia Fan, Yahao Huang, Ke Zhao, Ahmed Mansour, Thomas Gentzis, Mehdi Ostadhassan
Summary: This study investigates the paleoenvironment and hydrological conditions of the Paleogene Shahejie Formation (Es3) in the Dongpu Depression, China, using trace element proxies and carbon and oxygen stable isotopes. The results show that the formation was mainly deposited under oxic and oxic/suboxic conditions, with anoxic conditions in certain areas. There is a decrease in oxygen levels and an increase in paleoproductivity from the lower to the upper part of the Es3. The presence of salt rocks affects the paleoredox proxies, and the Sr/Ba values are not a reliable indicator of paleosalinity in salt-bearing strata. The study suggests a hydrologically open lake environment with sea level transgression and freshwater influx in the lake basin.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Multidisciplinary Sciences
Agnieszka Ciurej, Zofia Dubicka, Andriy Poberezhskyy
Summary: The Late Cretaceous was a unique period characterized by elevated sea levels, reduced land area, and high concentrations of atmospheric CO2. Calcification of plankton, specifically calcareous dinoflagellate cysts, was prevalent during this time and may be a potential proxy for paleoenvironmental conditions. Nutrient availability and tectonic activity influenced the distribution of calcareous dinocysts.
Article
Environmental Sciences
Patrick Charapata, Casey T. Clark, Nathan Miller, Sarah S. Kienle, Daniel P. Costa, Michael E. Goebel, Heather Gunn, Emily S. Sperou, Shane B. Kanatous, Daniel E. Crocker, Renato Borras-Chavez, Stephen J. Trumble
Summary: In this study, the utility of leopard seal whiskers as a biomonitoring tool for tracking contaminants and monitoring the health of Antarctic flora and fauna was examined. The analysis of leopard seal whiskers revealed variability in non-essential trace elements over time that could be partly explained by changes indict. The levels of mercury (Hg) in the whiskers were not high enough to indicate high risk of Hg toxicity, but the maximum Hg concentrations observed were higher than those measured two decades ago. The study also suggested that selenium (Se) may detoxify the Hg burden in leopard seals.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Geochemistry & Geophysics
Hamzeh Mehrabi
Summary: This paper summarizes the depositional history, diagenetic alteration, and geochemistry of the Upper Cretaceous carbonate rocks of the Sarvak Formation in south and southwest Iran. The study reveals that tectonic activities and paleoclimate played a significant role in the formation's depositional-diagenetic evolution. The reservoir characteristics of the formation, including paleoexposure events and karstification, make it a typical paleokarst hydrocarbon reservoir in Iran.
Article
Paleontology
Hassan Jbari, Hamid Slimani
Summary: This study in northwestern Morocco provides insights into the paleoenvironment and paleoclimate by comparing dinocyst assemblages and palynofacies from different time periods. The variations in dinocyst taxa throughout the section indicate changes in marine sedimentary environments, while kerogen analysis reveals palynofacies types associated with different marine settings.
Article
Geosciences, Multidisciplinary
Qingling Wang, Yuanku Meng, Youqing Wei, Li Jiang, Zhenzhen Wang, Guangzhou Mao
Summary: The Gangdese magmatic belt in southern Tibet is an important area to study the Neo-Tethyan subduction and continental crustal growth and reworking. This study focuses on a newly identified granitic pluton in the middle Gangdese belt and provides insights into the age, source, and geological background of the region. The results indicate that the granitic pluton was emplaced and crystallized during the Early Cretaceous in response to the northward subduction of the Neo-Tethyan oceanic lithosphere.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Tim A. Moore, Shifeng Dai, Carme Huguet, Jillian Pearse, Jingjing Liu, Joan S. Esterle, Rongkun Jia
Summary: This study conducted petrographic, geochemical, and carbon isotopic determinations on coal samples from the Late Cretaceous-Paleocene Guaduas Formation in Colombia. The results revealed the characteristics and influences of the depositional environment and climate on the formation.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geology
Sandy M. S. McLachlan, Vera Pospelova
Summary: This study reports a conformable K/Pg boundary succession in North America west of the Rocky Mountains and in the north-eastern Pacific, based on biostratigraphic controls. The palynological data record a marine assemblage turnover in the middle Oyster Bay Formation, indicating fluctuation between predominantly coastal and largely estuarine paleoenvironments across the K/Pg boundary. Localized paleoenvironmental conditions and climatic changes are reflected in the palynological assemblages, consistent with observations from numerous localities across both hemispheres.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Hamid Slimani, Amel M'Hamdi, Alfred Uchman, Marian Adam Gasinski, Kore Elysee Guede, Imane Mahboub
Summary: Dinoflagellate cysts from turbiditic deposits in the Outer Carpathians of southern Poland were analyzed and found to be of a latest Campanian age, contradicting previous age attributions based on foraminifera. Further multidisciplinary studies are needed to resolve this discrepancy. Multi-taxa dinocyst assemblages and significant reworking of Campanian dinocyst taxa suggest deposition by turbiditic currents.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Hamid Slimani, Mouna Chekar
Summary: This study provides refined age estimation of sediments in northwestern Morocco and establishes biostratigraphic correlations with other regions, contributing to the understanding of the regional geological development.
NEWSLETTERS ON STRATIGRAPHY
(2023)
Article
Ecology
Jamin G. Wieringa, Juliet Nagel, C. J. Campbell, David M. Nelson, Bryan C. Carstens, H. Lisle Gibbs
Summary: The expansion of wind-energy facilities has led to increased energy production and also the mortality of wildlife, particularly migratory bats. The lack of understanding about the geographic impact of bats killed at these facilities hinders management decisions. Stable hydrogen isotope ratios (delta H-2) of bat fur have been used to study this issue, but their varying values limit the precision of conclusions. Combining multiple biomarkers, such as delta H-2 values, trace element concentrations, and species distribution models, can improve the precision of assigning bat origins and understanding their movements.
Article
Geochemistry & Geophysics
Adhipa Herlambang, Cedric M. John
Summary: This study investigates the influence of precipitation rates on the fractionation of clumped isotopes between natural carbonates and their environmental solutions. Results suggest potential kinetic fractionation in ancient natural samples, leading to clumped isotope temperatures higher than environmental temperatures. The combination of clumped isotopes and trace elements approach reveals isotopic disequilibrium independent of the calculated temperature, demonstrating a critical step for future applications of the clumped isotope proxy to natural systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Paleontology
Eduardo Premaor, Javier Helenes, Paulo A. Souza, Wolfgang Kalkreuth
Summary: The study found that dinoflagellate cysts assigned to the subfamily Protoperidinioideae are abundant in Miocene coastal deposits in southern Brazil, with a high richness of this subfamily. The analysis of 49 taxa identified in 18 samples indicates a middle Miocene age for these samples.
MARINE MICROPALEONTOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Ahmed Mansour, Adedoyin Adeyilola, Thomas Gentzis, Humberto Carvajal-Ortiz, Natalia Zakharova
Summary: This study investigates the Upper Devonian Antrim Shale Formation in the Michigan Basin, providing insights into biostratigraphy, paleoenvironment, sea level fluctuations, organic matter properties, and source rock potential. The research reveals high organic matter content and excellent hydrocarbon generating potential in the Norwood, Lachine, and Upper members, while the Paxton Member has poor to fair organic richness and low hydrocarbon potential.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Ahmed Mansour, Thomas Gentzis, Sameh S. Tahoun, Mohamed S. Ahmed, Michael Wagreich, Humberto Carvajal-Ortiz, Jacob Neumann, Ahmed E. Radwan
Summary: During the Early Cretaceous (Albian), there was a global warming and increased environmental perturbations, resulting in the accumulation of organic carbon-rich sediments. In the southern margin of the Tethys Ocean, there were shallow water conditions with some phases of bottom water anoxia. The Kharita Formation in the Abu Gharadig Basin underwent palynological analysis, organic matter characterization, hydrocarbon generation potential assessment, and thermal maturity assessment.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Douaa Fathy, Rainer Abart, Michael Wagreich, Susanne Gier, Mohamed S. Ahmed, Mabrouk Sami
Summary: This study evaluated the continental weathering intensity, climatic changes, and their impact on the deposition of Late Campanian black shale in the Western Desert of Egypt using mineralogical and geochemical data. The results showed that the black shale was deposited under warm/humid conditions based on its high concentrations of certain elements and specific geochemical ratios. The weathering intensity was strongly influenced by paleoclimate, but had a weak impact on oceanic nutrient fluxes and water salinity during the deposition of Late Campanian black shale.
Editorial Material
Geosciences, Multidisciplinary
Colin N. Waters, Martin J. Head, Jan Zalasiewicz, Francine M. G. McCarthy, Scott L. Wing, Peter K. Haff, Mark Williams, Anthony D. Barnosky, Barbara Fialkiewicz-Koziel, Reinhold Leinfelder, J. R. McNeill, Neil L. Rose, Will Steffen, Colin P. Summerhayes, Michael Wagreich, Zhisheng An, Alejandro Cearreta, Andrew B. Cundy, Ian J. Fairchild, Agnieszka Galuszka, Irka Hajdas, Yongming Han, Juliana A. Ivar do Sul, Catherine Jeandel, Jaia Syvitski, Simon D. Turner, Jens Zinke
Summary: Merritts et al. inaccurately portray Paul Crutzen's Anthropocene concept, misinterpreting it as encompassing all significant anthropogenic impacts, extending back many millennia. Waters et al. introduced the concept of a Great Acceleration Event Array (GAEA) which highlights diverse and complex stratigraphic event markers that are tightly clustered around 1950 CE, providing a clearly recognizable Anthropocene chronostratigraphic base. The 'Anthropocene event' proposed by Merritts et al., following Gibbard et al., confuses the transformative human impact of the chronostratigraphic Anthropocene. Waters et al. recognize an evidence-based Anthropogenic Modification Episode that is more explicitly defined than the interpretive interdisciplinary 'Anthropocene event' of Gibbard et al.
EARTH-SCIENCE REVIEWS
(2023)
Article
Biology
Adam Wierzbicki, Erik Wolfgring, Michael Wagreich, Mariusz Kedzierski, Regina Mertz-Kraus
Summary: The periodicity of celestial bodies' mutual position is essential for life on Earth. In this study, we analyzed the fossilized shell of Inoceramus (Platyceramus) salisburgensis and discovered a regular geochemical signal repetition with a cycle of approximately 0.006 mm. The estimated shell accretion rate is about 0.4 cm per lunar year. We identified a biological clock that follows either a semilunar or a tidal cycle, and the tidal dominance cycle seems to be a better fit for the behavior of I. (P.) salisburgensis.
Article
Geosciences, Multidisciplinary
Shahid Iqbal, Mehwish Bibi, Michael Wagreich
Summary: Bauxite deposits in the Salt Range, Pakistan, formed through intense weathering under warm and humid conditions during the Triassic-Jurassic Boundary. These deposits are rich in kaolinite, haematite, boehmite, and enriched in trace elements and Rare Earth Elements. They are synchronous with bauxite deposits in the Alborz Mountains, Iran, suggesting an eastward extension of these deposits.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geography, Physical
Martin J. Head, Colin N. Waters, Jan A. Zalasiewicz, Anthony D. Barnosky, Simon D. Turner, Alejandro Cearreta, Reinhold Leinfelder, Francine M. G. McCarthy, Daniel de B. Richter, Neil L. Rose, Yoshiki Saito, Davor Vidas, Michael Wagreich, Yongming Han, Colin P. SumMerhayes, Mark Williams, Jens Zinke
JOURNAL OF QUATERNARY SCIENCE
(2023)
Article
Geochemistry & Geophysics
Ahmed Mansour, Sameh S. Tahoun, Aya Raafat, Mohamed S. Ahmed, Francisca Oboh-Ikuenobe, Thomas Gentzis, Xiugen Fu
Summary: This study conducted a comprehensive analysis of the Middle Jurassic in the north Western Desert, Egypt, and identified four different paleoenvironmental characteristics. The results showed that organic carbon-rich fine siliciclastic and carbonate deposits were predominantly found in the area. The composition of particulate organic matter, plant debris, and dinoflagellate cysts, as well as the types of organic matter in the rocks, reflected the depositional paleoenvironmental patterns. These findings are of great significance for a better understanding of the paleoenvironmental evolution and hydrocarbon potential in the region.
Article
Geochemistry & Geophysics
Ahmed Mansour, Sameh. S. S. Tahoun, Aya Raafat, Mohamed. S. S. Ahmed, Thomas Gentzis
Summary: This study conducted a detailed palynomorph and palynofacies analysis of the Middle Jurassic Khatatba Formation in the Dahab-Mireir Basin, revealing moderately diverse palynomorph assemblage and palynofacies. The findings provide insights into different depositional environments and relative sea level changes, which are of significant importance for understanding basin history, reservoirs, and source rock units.
Article
Biodiversity Conservation
Mostafa Mohamed Sayed, Petra Heinz, Ibrahim Mohamed Abd El-Gaied, Michael Wagreich
Summary: The Eocene deposits of Egypt provide valuable information for reconstructing the paleoenvironment during this warmhouse climate interval. The studied rock samples showed rich benthic foraminiferal assemblages and limited occurrences of planktonic foraminifera. The identified species indicate the presence of moderate to high oxygen levels and warm climatic conditions.
Article
Geochemistry & Geophysics
Susanne Jamaluddin, Michael Wagreich, Susanne Gier, Katerina Schopfer, Desianto Payung Battu
Summary: This study evaluates the paleoenvironment and paleoclimatic controls of sediments in the Middle Miocene Balikpapan Group, Mahakam Delta of the Lower Kutai Basin, Indonesia. The results show that fluvio-deltaic depositional environment and humid tropical climate are the primary factors controlling the production, transport, distribution, and preservation of sedimentary organic matter.
Article
Geology
Polina Pavlishina, Docha Dochev, Michael Wagreich, Veronika Koukal
Summary: This article describes and stratigraphically calibrates the Upper Cretaceous succession (Coniacian to lowermost Maastrichtian, with focus on the Campanian) at Petrich, Central Srednogorie Zone in Bulgaria, based on nannofossils, dinoflagellate cysts, and inoceramids. The study identifies several standard nannofossil zones and subzones and correlates them with dinoflagellate cyst zones and inoceramid assemblages. The composition of the dinoflagellate cyst assemblages and palynofacies pattern indicates normal marine, oxic conditions and low nutrient availability during the Campanian.
ACTA GEOLOGICA POLONICA
(2023)
