Results 1 to 10 of about 5,717 (242)

Characterization of Nd Radiogenic Isotope Signatures in Sediments From the Southwestern Atlantic Margin [PDF]

Frontiers in Earth Science, 2018
Based on radiogenic isotope systems of neodymium [Epsilon Neodymium-εNd(0), 143Nd/144Nd, 147Sm/144Nd, and Sm-Nd Depleted Mantle Model ages-TDM] from current and previous data of continental rocks and associated sediments, this work provides the ...
Simone S. Mantovanelli, Colombo C. G. Tassinari, Michel M. De Mahiques, Michel M. De Mahiques, Luigi Jovane, Everton Bongiolo   +5 more
doaj   +4 more sources

Coupled strontium-calcium isotopes in Archean anorthosites reveal a late start for mantle depletion [PDF]

Nature Communications
Voluminous felsic continental crust is, as far as we know, unique to Earth, yet the timescales of its earliest growth remain debated. Archean mantle evolution is complementary to crustal growth but is largely unconstrained for strontium isotopes due ...
Matilda Boyce, Anthony Kemp, Chris Fisher, Dan Bevan, Aleksey Sadekov, Jamie Lewis, Simon Wilde, Tim Ivanic, Tim Elliott   +8 more
doaj   +2 more sources

Historical declines in parrotfish on Belizean coral reefs linked to shifts in reef exploitation following European colonization

Frontiers in Ecology and Evolution, 2022
Humans have utilized the Mesoamerican Reef (MAR) for millennia but the effects of prehistorical and historical fishing on this ecosystem remain understudied. To assess the long-term coupling of reef ecosystem and human dynamics in this region, we tracked
Wendy T. Muraoka, Katie L. Cramer, Aaron O’Dea, Jian-xin Zhao, Nicole D. Leonard, Richard D. Norris   +5 more
doaj   +1 more source

Nd and Sr Isotopes and REE Investigation in Tropical Weathering Profiles of Amazon Region

Frontiers in Earth Science, 2022
The exceptional development of lateritic profiles make the Amazon one of the best places to conduct a refined study on the effects of long-term tropical climate on the Earth's surface rocks.
Adriana Maria Coimbra Horbe, Márcio Fernando Dos Santos Albuquerque, Elton Luiz Dantas   +2 more
doaj   +1 more source

Sr-Nd-Hf Isotopic Disequilibrium During the Partial Melting of Metasediments: Insight From Himalayan Leucosome

Frontiers in Earth Science, 2022
Radiogenic isotopes of granitoids are widely applied to fingerprint the source of granitoids and study the magma mingling and assimilation processes, aiming to decipher the planetary differentiation.
Lei Yang, Lei Yang, Lei Yang, Jia-Min Wang, Xiao-Chi Liu, Gautam P. Khanal, Gautam P. Khanal, Fu-Yuan Wu, Fu-Yuan Wu   +8 more
doaj   +1 more source

Preliminary Discussion on the Highly Radiogenic Lead in Unalloyed Copper Artifacts of the Eastern Zhou Dynasty: Starting from the Huili Copper Spearheads

Metals, 2020
The debate about the highly radiogenic lead in Chinese archaeology has never ceased. However, previous studies have mainly focused on high leaded bronzes and lead materials, and with little specific discussion on the unalloyed copper artifacts and the ...
Xiaoting Wang, Wugan Luo, Yingdong Yang, Dian Chen, Jing Du, Xiang Tang   +5 more
doaj   +1 more source

Radiogenic isotope: not just about words

Applied Geochemistry, 2022
This viewpoint is a short comment on gender issues with isotope terminology. The terms "parent"/"daughter" should be avoided in favor of the more descriptive "precursor ion" and "product ion" terms.
Olivier Pourret, Karen Johannesson
openaire   +3 more sources

Radiogenic Pb Enrichment of Mississippi Valley-Type Metallic Ore Deposits, Southern Ozarks: Constraints Based on Geochemical Studies of Source Rocks and Their Diagenetic History

Geosciences, 2021
Southern Ozark Mississippi Valley-type ores are enriched in radiogenic Pb, with isotopic signatures suggesting that metals were supplied by two end-member components.
Jonathan Chick, Sydney E. McKim, Adriana Potra, Walter L. Manger, John R. Samuelsen   +4 more
doaj   +1 more source

The Upper Cretaceous intrusive rocks with extensive crustal contribution in Hacımahmutuşağı Area (Aksaray/Turkey)

Geologica Carpathica, 2019
The Hacımahmutuşağı area (Aksaray/Turkey) is located in the western part of the Central Anatolian Crystalline Complex (CACC). Gneiss and marble compose the basement units, while intrusive rocks are gabbros and granitoids.
Köksal Serhat
doaj   +1 more source

Chemical Geodynamics Insights From a Machine Learning Approach

Geochemistry, Geophysics, Geosystems, 2022
The radiogenic isotope heterogeneity of oceanic basalts is often assessed using 2D isotope ratio diagrams. But because the underlying data are at least six dimensional (87Sr/86Sr, 143Nd/144Nd, 176Hf/177Hf, and 208,207,206Pb/204Pb), it is important to ...
A. Stracke, M. Willig, F. Genske, P. Béguelin, E. Todd   +4 more
doaj   +1 more source