Results 101 to 110 of about 4,118 (239)
Present and past changes in continental weathering and ocean circulation from radiogenic Nd, Hf and Pb isotopes [PDF]
, 2018 The past and present variability of ocean circulation and weathering inputs can be reconstructed from the geochemical composition of seawater and marine sediments.
Dausmann, Veit
core
Data for: "Stable and radiogenic strontium isotopes trace the composition and diagenetic alteration of remnant glacial seawater." [PDF]
Stable and radiogenic Sr isotopes in pore fluids and carbonate from IODP Exp. 359 (Maldives)THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE.
Wood, M (via Mendeley Data)
core +1 more source
Brazilian Journal of Geology, 2019 Combined Sm-Nd isotope studies and U-Pb ages of detrital zircons have shown significant differences between the provenance patterns of Neoproterozoic metasedimentary successions in the Southern Brasília belt.
Manuela de Oliveira Carvalho +4 more
doaj +1 more source
Tracing the Migration of Fronts in the Pacific Southern Ocean Across the Mid‐Pleistocene Transition
Paleoceanography and Paleoclimatology, Volume 41, Issue 7, July 2026.Abstract The Southern Ocean is a key driver of global climate variability, yet its dynamics during the Mid‐Pleistocene Transition (MPT; ∼1.25–0.7 Ma) remain poorly understood, especially in the South Pacific sector. The Polar Frontal Zone (PFZ) underwent significant latitudinal shifts during this critical period of climate reorganization.
V. M. Sinnen +6 more
wiley +1 more source
Recent Development in Radiogenic Isotope Geology
Journal of Geography (Chigaku Zasshi), 1964 Several topics of the research in radiogenic isotope geology are briefly reviewed. This short review consists of four parts; (i) recent development in the instrumentation, (ii) in the methodology, (iii) topics on the mantle-crustal evolution on the basis of Pb, Sr isotope growth and (iv) geochronology of ocean floors.
openaire +3 more sources
Mass Spectrometry in Earth Sciences: The Precise and Accurate Measurement of Time
CHIMIA, 2014 Precise determinations of the isotopic compositions of a variety of elements is a widely applied tool in Earth sciences. Isotope ratios are used to quantify rates of geological processes that occurred during the previous 4.5 billion years, and ...
Urs Schaltegger +4 more
doaj +1 more source
A Tropically Hot Late Jurassic North American Sundance Sea: Evidence for the Oxfordian Warm Interval
Paleoceanography and Paleoclimatology, Volume 41, Issue 7, July 2026.Abstract The Late Jurassic greenhouse climate was characterized by elevated atmospheric CO2 (pCO2) at 600–1,000 ppm and sea‐surface temperatures substantially warmer than today. These conditions peaked during the Oxfordian, when extensive epicontinental seaways, including the North American Sundance Sea, dominated mid‐latitude paleoceanography.
R. W. Reynolds +9 more
wiley +1 more source
Radiogenic Isotopes And Geochronology [PDF]
This resource provides illustrated lecture notes from a geochemistry course offered by Dr. Scott Wood at the University of Idaho. Topics include the law of radioactivity and the general geochronometry equation, the use common radioactive decay equations ...
Scott Wood
core
Radiogenic Ca isotopes confirm post-formation K depletion of lower crust [PDF]
, 2019 Heat flow studies suggest that the lower crust has low concentrations of heat-producing elements. This could be due to either (i) greater fractions of basaltic rock at depth or (ii) metamorphic depletion of radioactive elements from rocks with more ...
Rubatto, Daniela +4 more
core +1 more source
Differing Controls on the Cycling of Neodymium in the Atlantic and the Pacific
Geophysical Research LettersNeodymium (Nd) isotopes ratios are regarded as a key proxy for past ocean circulation despite unsettled debate on marine Nd cycle controls, which opposes a “top‐down” hypothesis (surface sources dominate) and a “bottom‐up” hypothesis (sedimentary sources
Paige M. Wise +3 more
doaj +1 more source