Johan Yans
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View article: Mineralogy and Fluid Inclusion Constraints on the Genesis of the Recently Discovered Ag-(Ni-Co-Sb-As-Hg ± Bi) Vein Ore Shoot Mineralization in the Aouli Pb-Zn District (Upper Moulouya, Morocco)
Mineralogy and Fluid Inclusion Constraints on the Genesis of the Recently Discovered Ag-(Ni-Co-Sb-As-Hg ± Bi) Vein Ore Shoot Mineralization in the Aouli Pb-Zn District (Upper Moulouya, Morocco) Open
Unusual Ag-(Ni-Co-Sb-As-Hg ± Bi)-bearing fault-fill vein ore shoot mineralization set in a gangue of quartz, fluorite, and barite has been identified in Morocco’s Aouli deposit. The Paleozoic host rocks consist of a succession of Cambrian …
View article: European mammal turnover driven by a global rapid warming event preceding the Paleocene–Eocene Thermal Maximum
European mammal turnover driven by a global rapid warming event preceding the Paleocene–Eocene Thermal Maximum Open
A brief global warming event known as the Pre-Onset Excursion (POE) occurred just before the Paleocene–Eocene Thermal Maximum (PETM, 56 Mya). The deconvolution of the evolutionary consequences of these two hyperthermal events is puzzling b…
View article: 3D models related to the publication: Unexpected pampatheriid from the early Oligocene of Peruvian Amazonia: insights into the tropical differentiation of cingulate xenarthrans.
3D models related to the publication: Unexpected pampatheriid from the early Oligocene of Peruvian Amazonia: insights into the tropical differentiation of cingulate xenarthrans. Open
International audience
View article: Unexpected pampatheriid from the early Oligocene of Peruvian Amazonia: insights into the tropical differentiation of cingulate xenarthrans
Unexpected pampatheriid from the early Oligocene of Peruvian Amazonia: insights into the tropical differentiation of cingulate xenarthrans Open
International audience
View article: Polymetallic interactions of Zn-Pb-Cu in blue/green-colored speleothems from Malaval Cave (France)
Polymetallic interactions of Zn-Pb-Cu in blue/green-colored speleothems from Malaval Cave (France) Open
Speleothems rarely exhibit stunning colors such as red, yellow, green, or blue. The colorations are often linked to elevated heavy metal ion concentration in the drip water and thus to a metal source/pollution in the catchment area. Here t…
View article: LA-ICP-MS trace element geochemistry of sphalerite as a proxy to the origin of the polymetallic Aouli sulfide Pb-Zn-Cu (Ag, Ni, Co, As) deposit (Eastern Meseta, Morocco)
LA-ICP-MS trace element geochemistry of sphalerite as a proxy to the origin of the polymetallic Aouli sulfide Pb-Zn-Cu (Ag, Ni, Co, As) deposit (Eastern Meseta, Morocco) Open
The trace-element geochemistry of sphalerite is commonly used as a proxy for the sulfur fugacity and temperature evolution of ore-forming fluids.  In this study, in-situ laser ablation-inductively coupled plasma-mass spectrometry…
View article: Rapid changes in continental sedimentation triggered by monsoon-type event during EECO hyperthermals, Minervois Basin, Southern France
Rapid changes in continental sedimentation triggered by monsoon-type event during EECO hyperthermals, Minervois Basin, Southern France Open
Recent studies on early Eocene climate have established that climatic fluctuations characterized by negative carbon isotopic excursions (CIE, hyperthermals) in the atmosphere associated to global warming, are responsible for drastically ch…
View article: Impact of the EECO on mammalian faunas: New Ypresian localities from Montpellier (France), a multidisciplinary approach
Impact of the EECO on mammalian faunas: New Ypresian localities from Montpellier (France), a multidisciplinary approach Open
An integrative chronological study on a new terrestrial sedimentary sequence north of Montpellier (southern France) yields an age ranging from 52.1 to 49.7 Ma. This sequence contains three new mammalian fossil localities, for the first tim…
View article: Alunite and kaolinite as geochemical markers in active acid sulfate alterations of southern Italy (Panarea, La Solfatara and Ischia)
Alunite and kaolinite as geochemical markers in active acid sulfate alterations of southern Italy (Panarea, La Solfatara and Ischia) Open
Hydrothermal alteration is a common process in volcanic and geothermally active areas. Interactions between host rock and hot, often acidic, fluids induce significant changes in texture, mineralogy, and geochemistry of the protolith, poten…
View article: A hybrid biomass-natural kaolinite for refractory ceramic manufacturing
A hybrid biomass-natural kaolinite for refractory ceramic manufacturing Open
The current study investigates the effect of adding a low-cost biomaterial (sawdust biomass) to kaolinite clay on the properties of insulating refractory materials. Natural kaolinite clay from NW Tunisia has been selected for porous cerami…
View article: Correction to: Tracing the Eh–pH evolution of Cu–Pb–As–Zn supergene mineralization using detailed petrography in the Cap Garonne mineral deposit (Provence, France)
Correction to: Tracing the Eh–pH evolution of Cu–Pb–As–Zn supergene mineralization using detailed petrography in the Cap Garonne mineral deposit (Provence, France) Open
The original version of this article unfortunately contained a mistake. Authors names were reversed. From: Poot Julien · Buelens Pierre · Dekoninck Augustin · Rochez Gaëtan · Yans Johan Should be corrected to: Julien Poot · Pierre Buelens …
View article: Pyrite oxidation rates and timing of weathering in supergene deposits: new insights from XPS approach
Pyrite oxidation rates and timing of weathering in supergene deposits: new insights from XPS approach Open
Pyrite is one of the most common sulfides on Earth and occurs in many Cu, Pb and Zn sulfides (hypogene) ore deposits. By using XPS (X-ray Photoelectron Spectroscopy) surface and depth analyses, we propose a new experimental approach to det…
View article: Unsupervised topological analysis of polarized light microscopy: application to quantitative birefringence imaging
Unsupervised topological analysis of polarized light microscopy: application to quantitative birefringence imaging Open
The determination of birefringence (magnitude and axis orientation) of optical materials is of significant interest in various fields. In the case of composite samples, this task becomes complicated and time-consuming; therefore, a partial…
View article: Experimental timing of pyrite oxidation under various leaching conditions: consequences for rates of weathering in geological profiles
Experimental timing of pyrite oxidation under various leaching conditions: consequences for rates of weathering in geological profiles Open
Pyrite (FeS 2 ) is one of the most abundant sulfides on Earth and has already been studied in numerous ways for decades because of its rapid oxidation and the associated environmental impacts. This study proposes a new experimental physico…
View article: Ni-rich mineral nepouite explains the exceptional green color of speleothems
Ni-rich mineral nepouite explains the exceptional green color of speleothems Open
Speleothems are secondary mineral structures typically found in karstic caves and usually composed of calcite or aragonite. Despite being naturally white, some might exhibit unusual colors, such as blue, black, red, yellow or green. The ca…
View article: Two mineralizing events unraveled by trace element geochemistry of ore-related apatite from the polymetallic Cu-(Pb-Zn-Ba) Oumjrane deposit (Eastern Anti-Atlas, Morocco)
Two mineralizing events unraveled by trace element geochemistry of ore-related apatite from the polymetallic Cu-(Pb-Zn-Ba) Oumjrane deposit (Eastern Anti-Atlas, Morocco) Open
The Oumjrane copper deposit in eastern Anti-Atlas is one of the top three major copper producers in North Africa with an annual production exceeding 260,000 tons at an average grade of 1.4% Cu. Current inferred resources are estimated at 5…
View article: How to create the highest manganese ore grade in the world? A geodynamic story in the Atlas of Morocco.
How to create the highest manganese ore grade in the world? A geodynamic story in the Atlas of Morocco. Open
The Imini mining district (Morocco) hosts the largest manganese (Mn) ore deposits of North Africa (~120.000 T in 2016). The area is world recognized for hosting several epigenetic karst-type high-grade manganese deposits in a 10-15 meters …
View article: Supplementary data for "Ni-rich mineral nepouite explains the exceptional green color of speleothems"
Supplementary data for "Ni-rich mineral nepouite explains the exceptional green color of speleothems" Open
This supplementary data spreadsheet contains the complete list of samples used for the analyses and the relevant results obtained by EPMA analyses.
View article: Supplementary data for "Ni-rich mineral nepouite explains the exceptional green color of speleothems"
Supplementary data for "Ni-rich mineral nepouite explains the exceptional green color of speleothems" Open
This supplementary data spreadsheet contains the complete list of samples used for the analyses and the relevant results obtained by EPMA analyses.
View article: The Source-to-Sink Vade-mecum: History, Concepts and Tools | Vade-mecum de l'approche Source-To-Sink: Histoire, Concepts et Outils
The Source-to-Sink Vade-mecum: History, Concepts and Tools | Vade-mecum de l'approche Source-To-Sink: Histoire, Concepts et Outils Open
“The Source-to-Sink Vade Mecum: History, Concepts and Tools” is the latest Open-Access addition to the SEPM series Concepts in Sedimentology and Paleontology. In the form of a carry-along vade-mecum, in English and French, this volume offe…
View article: Discovery of antiskarn-hosted strategic metal mineralization in the Upper Cretaceous Twihinate carbonatite intrusion (West African Craton Margin, Moroccan Sahara)
Discovery of antiskarn-hosted strategic metal mineralization in the Upper Cretaceous Twihinate carbonatite intrusion (West African Craton Margin, Moroccan Sahara) Open
The Upper Cretaceous Twihinate carbonatite in Moroccan Sahara, which is the focus of ongoing exploration for Nb-P-Fe ± LREE ± U-Th resources, consists of a crescent-like intrusion made of a central sövite body encircled by an annular ring …
View article: Unravelling the Temporal and Chemical Evolution of a Mineralizing Fluid in Karst-Hosted Deposits: A Record from Goethite in the High Atlas Foreland (Morocco)
Unravelling the Temporal and Chemical Evolution of a Mineralizing Fluid in Karst-Hosted Deposits: A Record from Goethite in the High Atlas Foreland (Morocco) Open
Timing and duration of ore deposit formation are crucial to understanding the mineralization process. To address this, the geochronological (U-Th)/He method, geochemical and H- and O-isotope compositions of pure goethite formed in the Imin…
View article: Supplementary data for "Pterosaur melanosomes support signalling functions for early feathers."
Supplementary data for "Pterosaur melanosomes support signalling functions for early feathers." Open
Supplementary data for the manuscript entitled "Pterosaur melanosomes support signalling functions for early feathers."
View article: Supplementary data for "Pterosaur melanosomes support signalling functions for early feathers."
Supplementary data for "Pterosaur melanosomes support signalling functions for early feathers." Open
Supplementary data for the manuscript entitled "Pterosaur melanosomes support signalling functions for early feathers."