Strontium isotope chemistry, presented here, combined with previously obtained groundwater ion chemistry elucidates the stratigraphy of buried sedimentary rocks of the southern Yucatan Peninsula, Mexico. Whereas in groundwater of the northern Peninsula, ion chemistry is dominated by contact with a saline intrusion, the groundwater of southern Campeche and southern Quintana Roo has high SO4/Cl a...

Introduction: The gray crystalline hematite on Mars was detected in three regions, Sinus Meridiani, Aram Chaos and Valles Marineris by the thermal emission spectrometer (TES) onboard the Mars Global Surveyor (MGS) orbiter [e.g.1, 2]. The Mars Exploration Rover (MER) Opportunity confirmed that hematite-rich spherules (~ 4.2 mm) are embedded in sulfur-rich layered outcrops and accumulated on the ...

Well-dated lacustrine records are essential to establish the timing and drivers of regional hydroclimate change. Searles Basin, California, depositional history a fluctuating saline-alkaline lake in terminal basin Owens River system draining eastern Sierra Nevada. Here, we U-Th chronology for ∼76-m-long SLAPP-SLRS17 core collected 2017 based on dating evaporite minerals. Ninety-eight dated samp...

Highlighting how crustal shortening is accommodated in space and time fold-thrust belts a major issue for understanding the long-term tectonic evolution of orogenic systems. In this study, we combine surface subsurface data to build 150 km-long sequentially restored balanced cross-section across two superimposed foreland southeastern France: upper Cretaceous-Eocene Provençal belt Oligocene-Neog...

the qom formation, which hosts the mazraeh celestite deposit, contains dominantly limestones, marl and subordinate evaporites deposited in shallow marine environments. petrographic evidence indicates that the celestite deposits were formed by replacement of limestone. the presence of carbonate inclusions within celestite crystals as well as the pseudomorphic habits of some crystals suggests tha...