Results 121 to 130 of about 10,620 (270)

The thermal behaviour of some feldspars from Egypt [PDF]

, 1991
A new and sensitive Hungarian derivatograph is used in studying the thermal behaviour of six feldspars from Egypt and U.S.A., its temperature range is up till 1200 °C.
El Sokkary A. A.
core  

Environmental dynamics and timing of the late Eemian interglacial to the Weichselian pleniglacial at Lichtenberg, Germany: implications for the Oerel and Glinde interstadials

Boreas, EarlyView.
The terrestrial sediment archives of northern Germany provide important insights into Late Pleistocene climate variability, but continuous and well‐dated records remain rare. In particular, the age and stratigraphic position of the Oerel and Glinde interstadials within the Early Weichselian to pleniglacial transition remain poorly constrained.
Alexis Badai Samudra, Michael Hein, Martin Theuerkauf, Neda Rahimzadeh, Marcel Weiss, David Colin Tanner, Brigitte Urban   +6 more
wiley   +1 more source

⁴⁰Ar/³⁹Ar DATING OF ALKALINE ROCKS FROM THE BURPALA MASSIF AS A KEY TO UNDERSTANDING ITS FORMATION DURATION

Геодинамика и тектонофизика
The article presents the results of 40Ar/39Ar dating of rocks (quartz and alkali syenites, nepheline syenites with REE-Nb-Zr mineralization) from the Burpala massif using feldspar, phlogopite, and amphibole.
A. V. Ponomarchuk, A. G. Doroshkevich, I. A. Izbrodin, A. V. Malyutina, T. A. Radomskaya   +4 more
doaj   +1 more source

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

Mineralogical Components of the Upper Jurassic Naokelekan Formation from Northeastern Iraq

المجلة العراقية الوطنية لعلوم الارض
The upper Jurassic Naokelekan Formation has been investigated using X-ray diffraction and scanning electron microscopy in two outcrop sections from Halabja and Barzinja areas in northeastern Iraq to determine mineralogical composition.
Sumaya Asghar Samad, Hasan A. Ali Al-Jumaily, Ali Ismail Al-Juboury, Harry Rowe, Giovanni Zanoni, Rebwar H. Rasool, Arkan O. Sharazwri   +6 more
doaj   +1 more source

A study of K-feldspars from the Serres-Drama plutonic complex, Northern Greece

, 1998
The variation in the structural state of potassium feldspars from the Serres-Drama plutonic complex, Northern Greece, from X-ray diffraction study is discussed.
Theodorikas, S.
core  

Lead isotope evidence for Antarctic Ice Sheet changes in the Weddell Sea sector since the Last Glacial Maximum

Boreas, EarlyView.
The Weddell Sea influences global ocean circulation and sea level through modulating Antarctic Bottom Water formation and Antarctic Ice Sheet discharges, but the history of ice‐sheet dynamics in this region remains poorly constrained due to limited well‐dated geological records.
Huang Huang, Yuanyang Hu, Marcus Gutjahr, Florian Kirsch, Lijuan Lu, Jianjun Zou, Xuefa Shi, Michael Bollen, Jimin Yu, Gerhard Kuhn   +9 more
wiley   +1 more source

(Table 4) Geochemistry of feldspars, glasses, and secondary minerals at DSDP Holes 80-550B and 80-551

, 1985
(Table 4) Geochemistry of feldspars, glasses, and secondary minerals at DSDP Holes 80-550B and 80 ...
Maury, R C, Bougault, Henri, Bohn, Marcel, Herve Bellon (6886961), de Graciansky, Pierre C, R C Maury (6962147), Joron, Jean Louis, Bellon, Herve, Jean-Louis Joron (6887249), Marcel Bohn (6962150), Pierre C de Graciansky (6886769), Henri Bougault (6886226)   +11 more
core   +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

The thermal history of the Monteregian intrusive based on a study of the feldspars.

, 1962
The composition and structural features of feldspars from the rocks of Mounts Royal, Bruno, Johnson, St. Hilaire, Rougemont, Yamaska, Shefford and Brome have been studied by optical and x-ray diffraction methods.
Pouliot, Gaston.
core