Results 51 to 60 of about 884,714 (212)
The Effect of Crystal Orientation on In Situ Rb‐Sr Mica Geochronology
Geostandards and Geoanalytical Research, EarlyView.Key Points No significant effect of mica grain orientation on Rb‐Sr date. Rb‐Sr laser signal stability is generally better perpendicular to mica c‐axis. No significant matrix effect noted between different mica group members. Mica crystals have a highly asymmetric structure, arranged in sheets of two tetrahedral layers bonded to a single octahedral ...
Kyle P. Larson +4 more
wiley +1 more source
An investigation into the controls of granite plutonism in the Sierra da Freita region, Northern Portugal [PDF]
, 2012 The Serra da Freita region of north central Portugal was chosen for study as it displays the complex relationships between regional structure, plutonism, regional and contact metamorphism typical of this part of Iberia.
Reavy, Reginald John
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Journal of Biogeography, EarlyView.ABSTRACT Aim This study investigates the diversity and phylogeny of Dactylogyrus species in the Middle East, as well as uncovers the historical dispersal routes and biogeographical contacts of cyprinoid host species using their host‐specific parasites. Location The Middle East. Taxon Dactylogyrus (Dactylogyridae: Monogenea), Cyprinoidei (Cypriniformes).
F. Nejat +6 more
wiley +1 more source
Stratabound arsenic and vein antimony mineralisation in Silurian greywackes at Glendinning, south Scotland [PDF]
, 1983 Stratiform and disseminated pyrite-arsenopyrite concentrations are overprinted by fracturecontrolled polymetallic mineralisation including stibnite through at least tens of metres of Silurian sediments at Glendinning, near Langholm.
Gallagher, M.J. +10 more
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Journal of Fish Biology, EarlyView.Abstract A new species of ghost electric knifefish, Porotergus sambaibensis sp. nov., is described from the Javaés River, a tributary of the Araguaia River in Brazil. The new species was assigned to the genus Porotergus as the closest relative to Porotergus gimbeli through maximum likelihood reconstruction of a concatenated multilocus dataset ...
Marina B. Mendonça +4 more
wiley +1 more source
Transitional geometries between gently plunging and steeply plunging folds: an example from the Lower Palaeozoic Brabant Massif, Anglo-Brabant deformation belt, Belgium [PDF]
, 2004 A
Debacker, Timothy +2 more
core +2 more sources
Fluid or Melt? Distinguishing Syn‐Deformational Interaction Pathways
Journal of Metamorphic Geology, EarlyView.ABSTRACT Understanding whether deformation occurred in the presence of aqueous fluid or silicate melt is crucial for interpreting ductile shear zones, impacting their thermal and geochemical evolution, and having rheological consequences. To identify the syn‐deformational fluid type, we investigate contrasting shear zones active during the Alice ...
Hindol Ghatak +3 more
wiley +1 more source
Geology of a Part of the Panamint Range, California [PDF]
, 1932 The Panamint Range is a tilted fault-block, uplifted probably in Tertiary time and rejuvenated by very complex recent faulting on the west. This great block is approximately 100 miles long, but the reconnaissance geologic map covers only a tract in the ...
Murphy, F. M.
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Accretionary Tectonics of the North American Cordillera [PDF]
, 1983 Continental geology stands on the threshold of a change that is likely to be as fundamental as plate-tectonic theory was for marine geology. Ongoing seismic-reflection investigations into the deep crustal structure of North America are verifying that ...
Saleeby, Jason B.
core +2 more sources
New Phytologist, EarlyView.Summary With over 60 parallel origins representing evolutionary replicates, C4 photosynthesis is well‐suited for studying complex trait evolution. However, lineages with diverse C3–C4 intermediate species are scarce, leaving uncertainty in models of C4 evolution.
Matt Stata +6 more
wiley +1 more source