Results 21 to 30 of about 882,079 (194)

Silesaurid (Archosauria: Dinosauriformes) remains from the base of the Dockum Group (Late Triassic: Otischalkian) of Texas provide new insights to the North American record of dinosauriforms

The Anatomical Record, EarlyView.
Abstract Silesaurids (Archosauria: Dinosauriformes) are found in Middle to Upper Triassic deposits across Pangea, but few stratigraphic sections record the evolution of the group in one geographic area over millions of years. Here, we describe silesaurid remains from the oldest of the Upper Triassic stratigraphic sequence from the base of the Dockum ...
Frederick B. Tolchard, Brynden W. Perkins, Sterling J. Nesbitt   +2 more
wiley   +1 more source

Zircon dissolution in a ductile shear zone, Monte Rosa granite gneiss, northern Italy [PDF]

, 2008
The sizes, distributions and shapes of zircon grains within variably deformed granite gneiss from the western Alps have been studied. Zircon shows numerous indicators of a metamorphic response in both the host gneiss and a 5 cm wide continuous ductile ...
Dal Piaz, Engi, Ewing, Hanchar, Hunziker, J. C. Martin, Keller, Kretz, Liati, Moller, Pawlig, Rubin, T. J. Dempster, Varva, Z. K. Shipton   +14 more
core   +1 more source

Oxidative Dehydrogenation of Ethylbenzene over Iron‐Based Catalysts: Challenges, Prospects, and Future Trends

ChemCatChem, EarlyView.
This review discusses different aspects of the oxidative dehydrogenation reaction of ethylbenzene to styrene over iron‐based oxides, emphasizing the properties of the catalysts and the participation of active sites, as well as the deactivation and regeneration processes using soft oxidants.
Johnatan de Oliveira Soares, Felipe Fernandes Barbosa, Tiago Pinheiro Braga   +2 more
wiley   +1 more source

Late Pleistocene to Holocene sedimentation in the Great Blue Hole (Lighthouse Reef, Belize): Results from a 30 m long core

The Depositional Record, EarlyView.
A 30 m long sedimentary succession at the bottom of the Belize Blue Hole represents terrestrial cenote (12.5–7.2 ka BP), restricted marine swamp (7.2–5.7 ka BP) and fully marine lagoonal phases (5.7–0 ka BP) on Lighthouse Reef carbonate platform. Post‐glacial and Holocene sea‐level rise largely controlled the sedimentological, faunal and floral changes
Eberhard Gischler, Dominik Schmitt, Annika Wiegand, Hermann Behling, Lyudmila Shumilovskikh, Martin Melles, Volker Wennrich, Elija Nolte, Jozef Grego, Flavio S. Anselmetti, Hendrik Vogel, Daniel Birgel, Jörn Peckmann   +12 more
wiley   +1 more source

Detailed Analysis of Structures in the Foot Wall of the Champlain Thrust at Lone Rock Point, Burlington, Vermont [PDF]

, 2015
The objective of this project was to identify a strain gradient and relative chronology within the foot wall of the Champlain Thrust Fault at Lone Rock Point, Burlington, Vermont in order to determine how the unique fault-bounded ellipsoidal lozenge ...
Strathearn, Christina Marie
core   +1 more source

Charles Darwin, Bartholomew Sulivan, and the geology of the Falkland Islands: unfinished business from an asymmetric partnership

, 2013
When in 1846 Charles Darwin published the first account of the geology of the Falkland Islands he drew on his experiences in 1833 and 1834 during the voyage of HMS Beagle, and on collections made at that time by the ship’s Assistant Surgeon, William ...
P. Stone, A. Rushton
semanticscholar   +1 more source

Petrogenetic and geochemical characteristics of some auriferous granitoids in the Kumasi Basin, Ghana: Implications for geodynamic settings and controls of orogenic gold mineralization in the Edikan Gold Mine

Deep Underground Science and Engineering, EarlyView.
The Fobinso granitoids are granodiorites, while the Esuajah granitoids are granites based on their mineralogical composition. The granitoids are generally enriched in LILE and LREE than HFSE, MREE, and HREE, indicating mixing with crustal sources during their evolution.
Emmanuel D. Sunkari, Obed Oppong, Theophilus K. Agbenyezi   +2 more
wiley   +1 more source

Corrosion effect of hydrochloric acid on the granite: Insights from electrical conductivity, mineral composition, and tensile behavior

Deep Underground Science and Engineering, EarlyView.
The evolution of electrical conductivity, mineral composition, and tensile behavior such as peak strength, average stiffness, and the energy evolution of the granite specimen under different HCl conditions are studied, analyzed as well as quantified, and investigated, respectively.
Yanan Gao, Yikang Cheng, Guanglei Cai, Yuan Gao, Jianwei Tian, Mingzhong Gao   +5 more
wiley   +1 more source

Terrestrial Lithium Exploration Adapted From Raman Diagnosis of Phyllosilicates for Mars

Journal of Raman Spectroscopy, EarlyView.
Analyses using a benchtop Raman instrument at the University of Aberdeen and a prototype instrument for remote deployment on Mars based at the University of Leicester successfully discriminated between four varieties of mica (possibly lithium‐rich rocks).
M. McHugh, J. R. T. Armstrong, J. Parnell, H. N. Lerman, C. Malherbe, I. B. Hutchinson   +5 more
wiley   +1 more source

Sixty Years of Sugarcane Monoculture Alters Carbon Preservation in Large Soil Macroaggregates in Tropical Soil

Land Degradation &Development, EarlyView.
ABSTRACT Frequent and intensive tillage in conventional agriculture disrupts soil aggregates, engendering significant depletion of soil organic carbon (SOC) stocks. Long‐term studies are essential for assessing the impact of sustainable practices on aggregate dynamics and carbon sequestration in sugarcane monocropping in tropical ecosystems.
Belchior Oliveira Trigueiro da Silva, Ademir De Oliveira Ferreira, Rattan Lal, Thiago Massao Inagaki, Telmo Jorge Carneiro Amado, João Carlos De Moraes Sá, Edivan Rodrigues de Souza, Aline Roma Tomaz, William Ramos da Silva, Felipe José Cury Fracetto   +9 more
wiley   +1 more source