Results 61 to 70 of about 4,777,909 (176)

Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating

Nature Communications
Understanding causal relationships between evolution and ocean oxygenation hinges on reliable reconstructions of marine oxygen levels, typically from redox-sensitive geochemical proxies.
Michal Ben-Israel, Robert M. Holder, Lyle L. Nelson, Emily F. Smith, Andrew R. C. Kylander-Clark, Uri Ryb   +5 more
doaj   +1 more source

AlpIce‐1: a database of geochronological and geomorphological constraints on Alps‐wide palaeoglacier fluctuations between the Last Glacial Maximum and the Holocene

Boreas, EarlyView.
The AlpIce‐1 database is the first compilation of published geomorphological and geochronological markers constraining build‐up, culmination and decay of glaciers from the Last Glacial Maximum through the Holocene across the entire European Alps. AlpIce‐1 integrates more than 4200 surface‐exposure and radiocarbon ages, homogenized, quality controlled ...
Sarah Kamleitner, Susan Ivy‐Ochs, Tancrède P. M. Leger, Andreas Henz, Samuel U. Nussbaumer, Andreas Vieli, Guillaume Jouvet   +6 more
wiley   +1 more source

Monazite and Cassiterite Dating and Pyrite S Isotopes of the Helukou Tungsten-Tin Polymetallic Deposit of the Guposhan Ore District, Nanling Range: Implications for Ore Genesis

Geosciences
The Guposh an orefield within the western segment of the Nanling Range hosts a globally significant tungsten and tin metallogenic province whose formation is tied to the intense Middle Jurassic granitic magmatism. Nonetheless, critical ambiguities remain
Ying’ai Zhou, Yiping Chen, Lujun Peng, Dezhen Zou, Jinlun Cai, Hao Lei, Jingya Cao   +6 more
doaj   +1 more source

Appraisal of Six Natural Mica Reference Materials for In Situ Rb‐Sr Geochronology

Geostandards and Geoanalytical Research, EarlyView.
Key Points Evaluated six natural mica reference materials for in situ LA‐ICP‐MS/MS Rb‐Sr geochronology using geochemical, microstructural and isotopic characterisation. Identified robust primary reference materials: Mount Dromedary biotite (99.37 Ma) and Mica‐Fe biotite (307.75 Ma). La Posta biotite and Högsbo muscovite are suitable secondary reference
Hugo K.H. Olierook, Bruno V. Ribeiro, Janne Liebmann, Kai Rankenburg, Fred Jourdan, Ahmad Redaa, Jarred C. Lloyd, Thomas M. Belgrano, Carlos R. Corella Santa Cruz, Yujin Jegal, Julien Mercadier, Catherine Zimmermann, Jie Yu, Andreas Zametzer, Christopher L. Kirkland, Sarah E. Gilbert, Craig D. Storey, Luc S. Doucet, Isabelle Jones, Louisa Stokes, Thomas Zack, Delia Rösel, Denis Fougerouse, Jonas Kaempf, Priyanjan Datta, Hijas Hameed, Noreen J. Evans, Malcolm P. Roberts, Juraj Farkas, Stijn Glorie, Celia Mayers, R. Adam Frew, Sarah Al Odeh, Chloe E. Roche, Massimo Chiaradia, Alicia M. Cruz‐Uribe, Alan S. Collins, Andreas Karlsson, Anusha Shantha Kumara   +38 more
wiley   +1 more source

Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc

Geophysical Research Letters, 2019
Exhumation of plutonic systems is driven by a range of mechanisms including isostatic, tectonic, and erosional processes. Variable rates of plutonic exhumation in active subduction systems may be driven by idiosyncrasies of regional geology or by first ...
C. J. Spencer, M. Danišík, H. Ito, C. Hoiland, S. Tapster, H. Jeon, B. McDonald, N. J. Evans   +7 more
doaj   +1 more source

Impact and Correction of Analytical Positioning on Accuracy of Zircon U-Pb Dating by SIMS

Frontiers in Chemistry, 2020
Secondary ion mass spectrometry (SIMS) is one of the most important analytical tools for geochronology, especially for zircon U-Pb dating. Due to its advantages in spatial resolution and analytical precision, SIMS is the preferred option for multi-spot ...
Yu Liu, Yu Liu, Qiu-Li Li, Qiu-Li Li, Qiu-Li Li, Xiao-Xiao Ling, Xiao-Xiao Ling, Guo-Qiang Tang, Guo-Qiang Tang, Jiao Li, Jiao Li, Xian-Hua Li, Xian-Hua Li, Xian-Hua Li   +13 more
doaj   +1 more source

Metamorphic or Igneous Zircon? Classification Through Rare Earth Elements, Machine Learning and Logistic Regression

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Zircon is a common, highly refractory accessory mineral found in sedimentary, igneous and metamorphic rocks that forms through various processes (e.g., magmatic, hydrothermal, metamorphic growth and recrystallization). Trace element compositions of detrital zircon have been widely applied to understanding tectonic processes and continental ...
Jarrod M. Burges, Chris Yakymchuk, Michael P. DiMaio, Timothy C. C. Lui, Anirudh Prabhu, Shaunna M. Morrison   +5 more
wiley   +1 more source

Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: Northwest Sonora, Mexico [PDF]

Geofísica Internacional, 2000
Eighty-five detrital zircon grains from Mesoproterozoic and/or Neoproterozoic to Middle Cambrian sedimentary strata in northwest Sonora, Mexico, have been analyzed to determine source terranes and provide limiting depositional ages of the units.
George E. Gehrels, John H. Stewart, Essa L. Gross   +2 more
doaj  

Coupled plagioclase dissolution and K‐feldspar overgrowth precipitation preserve anomalously high permeability in deeply buried sandstones

Sedimentology, EarlyView.
ABSTRACT This study investigated the formation mechanism responsible for anomalously high permeability (AHP) observed in the Eocene sandstones at depths from 3824 to 3832 m in the Huizhou Sag, Pearl River Mouth Basin, China, using helium porosity and permeability measurements, thin section, scanning electron microscopy, electron probe X‐ray ...
Changgui Xu, Huan Li, Wei Wang, Yangdong Gao, Guangrong Peng, Lin Ding, Eric O. Ansah, Pei Liu, Xiaoyan Li, Saju Menacherry, Hongtao Zhu, Xianghua Yang, Zhiwei Zeng   +12 more
wiley   +1 more source

Salt Range Formation of Pakistan Preserves Unique Record of Volcanic Fertilization During the Ediacaran Shuram Excursion

Terra Nova, EarlyView.
ABSTRACT Thin, discontinuous, organic‐rich oil shale beds in the siliciclastic‐evaporitic Salt Range Formation (SRF) of Pakistan are of approximate Neoproterozoic to Cambrian age based on stratigraphic constraints. The beds are enriched (26–43 wt.% total organic carbon, TOC) in aliphatic organic matter (OM) of low thermal maturity despite their ...
Paul C. Hackley, Ryan J. McAleer, Jay M. Thompson, Brett J. Valentine, Imran Khan   +4 more
wiley   +1 more source