Results 51 to 60 of about 761 (228)

Evaluation of the Rb/Sr ratio as an indicator of chemical weathering: a case study from five sedimentary sections in Northeast China

Boreas, EarlyView.
Chemical weathering plays a pivotal role in the Earth's surface material cycle and global climate regulation. It not only facilitates the reconstruction of palaeoclimate characteristics but also provides essential insights into Earth's evolutionary history.
Zhenyu Wei, Yuanyun Xie, Jie Meng, Lei Sun, Chunguo Kang, Yunping Chi, Peng Wu, Haijin Liu, Ruonan Liu, Ruitong Chang   +9 more
wiley   +1 more source

Metamorphic Inheritance, Lower‐Crustal Earthquakes, and Continental Rifting

Geochemistry, Geophysics, Geosystems
The Malawi Rift is localized within Precambrian amphibolite‐granulite facies metamorphic belts, bounded by up to 150 km long border faults, and generates earthquakes throughout ∼40 km thick crust.
Å. Fagereng, J. F. A. Diener, C. J. Tulley, B. Manda   +3 more
doaj   +1 more source

Petrogenesis of Huichizi granite and hosted amphibolite lens: implications for early Paleozoic evolution of the North Qinling orogenic belt

Frontiers in Earth Science
The genesis of Early Paleozoic granite and its relationship with multi-stage metamorphism in the North Qinling Tectonic Belt (NQTB) are heavily debated and limit our understanding on the evolution of the Qinling Orogenic Belt. In this paper, we conducted
Zhenhua Cui, Danling Chen, Yunfei Ren, Bowen Bai, Yuan Tang, Long Ma, Minglei Liu   +6 more
doaj   +1 more source

Fine‐Scale Factors Affecting the Abundance and Thermal Sensitivity of Nonnative Brook Trout in Coldwater Rocky Mountain Streams

Fisheries Management and Ecology, EarlyView.
ABSTRACT The Brook Trout (Salvelinus fontinalis) is a globally distributed nonnative species that threatens native salmonids in coldwater streams. Understanding the factors regulating Brook Trout densities in coldwater refugia is critical to effective management, so we investigated (a) fine‐scale drivers of Brook Trout abundance and (b) factors ...
Nicholas S. Voss, Brett J. Bowersox, Daniel C. Nolfi, Michael C. Quist   +3 more
wiley   +1 more source

Mineral chemistry of garnet in pegmatite and metamorphic rocks in the Hamedan area

Journal of Economic Geology, 2015
Introduction The area of this study is located near Hamadan within the Sanandaj - Sirjan tectonic zone. In the Hamadan area, consisting mainly of Mesozoic plutonic and metamorphic rocks, aplites and pegmatites locally contain garnets.(Baharifar et
Ahmad Ahmadi Khalaji, Zahra Tahmasbi
doaj  

Geochemistry and petrogenesis of the Kolah-Ghazi granitoid assemblage, south of Esfahan

Journal of Economic Geology, 2018
Introduction The Kolah-Ghazi granitoid assemblage is located in the south of Esfahan and in the Sanandaj-Sirjan magmatic-metamorphic zone. The Sanandaj-Sirjan zone is extended for 1500 km from Sirjan in the southeast to Sanandaj in the northwest of Iran
Jamshid Ahmadian, Hajar Gholamian, Ali Khan Nasr Esfahani, Maryam Honarmand   +3 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

Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution

Frontiers in Earth Science
IntroductionThe east-west trending Khondalite Belt, located on the northern margin of the North China Craton, is linked to the Paleoproterozoic Columbia supercontinent’s evolution.
Hao Hu, Dongyan Zhong, Zhiguang Zhou, Guosheng Wang, Shen Gao, Jianfeng Chen, Chenfei Feng   +6 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

Electron Microprobe Reintegration Method for Clinopyroxene Breakdown with Lamellae Exsolution

Yankuang ceshi
Pyroxene is an important rock-forming mineral in magmatic to metamorphic rocks, which often possesses certain breakdown texture with lamellae exsolution under temperature and pressure changes.
Xiaoli LI, Lifei ZHANG
doaj   +1 more source