Results 91 to 100 of about 4,093 (226)

Investigation on primary and secondary processes in Nasirabad manganese deposit, south of Neyriz: using mineralogy and Pb isotope geochemistry

Journal of Economic Geology, 2013
The Nasirabad manganese deposit is located 5 km south of Nasirabad, 8 km SW of Neyriz in the Fars province. Structurally, the area is placed in the southeastern part of Zagros thrust belt. In this area, the manganese mineralization occurred as ore layers
Ali Reza Zarasvandi, Mohsen Rezaei, Houshang Pourkaseb, Adel Saki   +3 more
doaj  

Oceanic Anoxic Event 2 triggered by Kerguelen volcanism

Nature Communications
Large Igneous Provinces (LIPs) are associated with global warming and carbon cycle perturbations during Oceanic Anoxic Event 2 (OAE2, ~94 Ma) and the Mid-Cenomanian Event (MCE, ~96.5 Ma).
C. A. Walker-Trivett, S. Kender, K. A. Bogus, K. Littler, T. Edvardsen, M. J. Leng, J. Lacey, J. B. Riding, I. L. Millar, D. Wagner   +9 more
doaj   +1 more source

Radiogenic p-isotopes from SN Ia, nuclear physics uncertainties and Galactic chemical evolution compared with values in primitive meteorites [PDF]

, 2014
The nucleosynthesis of proton-rich isotopes is calculated for multi-dimensional Chandrasekhar-mass models of Type Ia supernovae (SNe Ia) with different metallicities.
Dauphas, N., Röpke, F., Gallino, R., Rauscher, T., Travaglio, C., Röpke, F. K., Hillebrandt, W.   +6 more
core   +1 more source

A Common Reference Material for Mass‐Dependent Sn Isotope Compositions: An Inter‐Laboratory Calibration Approach

Geostandards and Geoanalytical Research, Volume 50, Issue 2, Page 341-367, June 2026.
Key Points We recommend using the notation δ122/118SnNIST SRM 3161a for mass‐dependent Sn isotope data. We derived conversion factors relative to NIST SRM 3161a for Puri Sn CEZA (0.132 ± 0.011‰), Sn Lyon (0.229 ± 0.016‰), Sn IPGP (0.162 ± 0.018‰). Tin isotope compositions are presented for SPEX CertiPrep Sn and nine USGS reference materials.
Aurélia C.E. Meister, Manuela A. Fehr, Quentin Amet, Gerhard Brügmann, Caroline Fitoussi, Matthias Friebel, Weiqiang Li, Frederic Moynier, Jia‐Xin She, Xueying Wang, Maria Schönbächler   +10 more
wiley   +1 more source

Continental Crust Rejuvenation Across the Paleo‐Mesoarchean Transition Resulted From Elevated Mantle Geotherms

Geophysical Research Letters
The increase in initial Hf isotopes identified in early Mesoarchean detrital zircon is commonly interpreted as a reflection of the geodynamic transition from stagnant‐lid to mobile‐lid tectonics.
Gui‐Mei Lu, Yi‐Gang Xu, Wei Wang, Christopher J. Spencer, Guangyu Huang, Nick M. W. Roberts   +5 more
doaj   +1 more source

The Vazante and Canastra groups revisited: Sm-Nd and Sr isotopes - evidence for contribution from Tonian intraplate magmatism during passive margin development along the SW São Francisco margin, Brazil

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, Claudio de Morisson Valeriano, Carla Cristine Aguiar Neto, Gustavo Diniz Oliveira, Monica Heilbron   +4 more
doaj   +1 more source

Radioactive and radiogenic isotope research

Eos, Transactions American Geophysical Union, 1971
The number of laboratories and workers in the field of radioactive isotope research has grown rapidly over the past four years. With this growth has come a large increase in the volume of literature on the subject. Consequently the bibliography, given below is meant to include the more significant or more complete investigations.
openaire   +1 more source

Geology of the Pitchblende Deposits of Port Radium, Great Bear Lake, N.W.T. [PDF]

, 1955
The geology of the McTavish Arm area of Great Bear Lake, Northwest Territories, Canada, is reviewed and a geologic map is presented. The geology of the Labine Point region is described in detail.
Campbell, Douglas Dean
core   +1 more source

Holocene ice sheet dynamics and detrital provenance shifts along the West Greenland Margin recorded by radiogenic isotopes (Sr, Nd, Pb)

, 2021
Due to the effect of Arctic Amplification the Arctic is currently warming at least twice as fast as the rest of the planet. Seasonal sea-ice extent has been alarmingly declining in the past decade.
Madaj, Lina
core   +1 more source

Low temperatures and high water/rock ratios in asteroid (101955) Bennu's history based on X‐ray powder diffraction of returned samples

Meteoritics &Planetary Science, Volume 61, Issue 6, Page 1077-1094, June 2026.
Abstract Samples returned by NASA's OSIRIS‐REx mission from the carbonaceous asteroid (101955) Bennu hold clues about conditions in the early solar system and the formation of planetary bodies. Initial investigation of Bennu samples found that they are rich in phyllosilicates and other secondary minerals formed during aqueous alteration of a larger ...
A. J. King, P. F. Schofield, J. Najorka, H. C. Bates, S. S. Russell, T. J. McCoy, T. J. Zega, H. C. Connolly Jr, D. S. Lauretta   +8 more
wiley   +1 more source