Results 51 to 60 of about 2,681 (235)

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, Volume 38, Issue 2, Page 97-105, April 2026.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source

Differing Controls on the Cycling of Neodymium in the Atlantic and the Pacific

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Neodymium (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 dominate), each with important implications for Nd isotope proxy interpretation.
Paige M. Wise, Benoît Pasquier, Seth G. John, Sophia K. V. Hines   +3 more
wiley   +1 more source

Implications for the source of the Marquesas Island OIB from short-lived radiogenic isotope and seismic data [PDF]

, 2022
Andi Mundl-Petermeier, Marie-Theres Herret, Bradley J. Peters, Doyeon Kim, Paterno R. Castillo   +4 more
openalex   +1 more source

Coral δ13C Reveals Little Ice Age Dimming of Tropical Surface Shortwave Radiation Not Captured by Climate Models

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Tropical low‐cloud feedback is the largest source of uncertainty in climate sensitivity, yet multi‐century records of surface shortwave radiation are scarce. We calibrate Porites coral δ13C against satellite photosynthetically available radiation (PAR) and reconstruct monthly PAR for the northern South China Sea during the Medieval Climate ...
Guangchao Deng, Huimin Guo, Xuefei Chen, Jian‐xin Zhao, Gangjian Wei, Wenfeng Deng   +5 more
wiley   +1 more source

Earth Mantle's Isotopic Record of Progressive Chemical Depletion

AGU Advances, 2023
Mid ocean ridge basalts are partial melts of mantle rocks that have become incompatible element depleted prior to recent sub‐ridge melting. This prior extent of melt extraction and concomitant incompatible element depletion is often inferred from the ...
C. Sani, A. Sanfilippo, A. A. Peyve, F. Genske, A. Stracke   +4 more
doaj   +1 more source

A 500‐kyr Pluvial Interval Triggered Lacustrine Carbon Burial in Late Cretaceous East Asia

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract The early Late Cretaceous hothouse was featured by intense storms and a prevailing monsoon climate, yet direct evidence for regional extreme precipitation events is rare. Here, we reconstruct local weathering and hydrological processes using magnesium and strontium isotopes (δ26Mg and 87Sr/86Sr) from lacustrine dolostones in the Upper ...
Yuke Liu, Xiaomei Wang, Minghao Wu, Jin Su, Chengshuai Yuan, Xuening Qi, Shuichang Zhang   +6 more
wiley   +1 more source

The Influence of Basaltic Islands on the Oceanic REE Distribution: A Case Study From the Tropical South Pacific

Frontiers in Marine Science, 2018
The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the
Mario Molina-Kescher, Ed C. Hathorne, Anne H. Osborne, Melanie K. Behrens, Martin Kölling, Katharina Pahnke, Martin Frank   +6 more
doaj   +1 more source

New Zealand Geological Timescale 2025

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
New Zealand Geological Timescale 2025 (NZGT 2025) is the first comprehensive update and revision of the New Zealand Geological Timescale in a decade. The criteria used to establish age ranges of New Zealand Stages within the NZGT have been reviewed, calibrated, and revised where required against the 2023/04 International Chronostratigraphic Chart and ...
Christopher D. Clowes, James S. Crampton, Kyle J. Bland, J. Ian Raine, Andrew F. Boyes, Hamish J. Campbell, Erica M. Crouch, Martin P. Crundwell, Neville Hudson, Elizabeth M. Kennedy, Donald A. B. MacFarlan, Hugh E. G. Morgans, Marcus D. Richards, Matthew W. Sagar   +13 more
wiley   +1 more source

Initiation of the Ferrar Large Igneous Province Started in Southern North Victoria Land, Antarctica, With Shallow Emplacement of Sills Causing Magma‐Soft‐Rock Interaction and Phreatomagmatic Eruptions

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
Early Jurassic volcanism was in the southern north Victoria Land portion of the Ferrar Large Igneous Province preceded by multiple phases of shallow‐level intrusions of Ferrar sills into the 300 m thick cover of sedimentary rocks of the Triassic‐Jurassic Victoria Group.
Lothar G. Viereck, Jörg Büchner, Robert Schöner, Jörg W. Schneider, Benjamin Bomfleur, Jan Tympel, Ricarda Hanemann, Axel Gerdes   +7 more
wiley   +1 more source

Thorium determination in seawater by inductively coupled plasma mass spectrometry: Method development and oceanographic applications

Talanta Open
Thorium isotopes in the ocean (including radiogenic isotopes and terrigenous-derived 232Th) serve as key tracers for studying land-derived material transport. While high-sensitivity and high-resolution inductively coupled plasma mass spectrometry (ICP-MS)
Yingjie Zou, Peng Wang, Lei Xu, Hong Ren, Yiyao Cao   +4 more
doaj   +1 more source