Results 51 to 60 of about 5,793 (215)

The Mg‐Fe Isotope Compositions and Geochemical Effects of Supercritical Fluids: Constraints From an Ultrahigh‐Pressure Eclogite‐Vein System in the Dabie Orogen

Geochemistry, Geophysics, Geosystems
Supercritical fluids are ideal media for mass transfer from the subducting slab into the mantle wedge. However, little is known about the Mg‐Fe isotope compositions of supercritical fluids in subduction zones.
Tie‐Nan Chen, Ren‐Xu Chen, Yong‐Fei Zheng, Zheng‐Hua Pan, Guo‐Chao Sun, Xue‐Jing Gan   +5 more
doaj   +1 more source

A novel chemical scheme for flotation of rutile from eclogite tailing

Results in Physics, 2017
A novel chemical scheme for the flotation of rutile from eclogite tailings has been developed in this work. It consists of lead ion as the activator, sodium fluorosilicate (SF) as the depressant, and styryl phosphonic acid (SPA) and n-octyl alcohol (OCT)
Bo Xu, Shuang Liu, Hongqiang Li, Yunliang Zhao, Hongchao Li, Shaoxian Song   +5 more
doaj   +1 more source

Syn-collapse eclogite metamorphism and exhumation of deep crust in a migmatite dome: The P-T-t record of the youngest Variscan eclogite (Montagne Noire, French Massif Central)

, 2015
International audienceIn many orogens, high-pressure (HP) metamorphic rocks such as eclogite occur as lenses in quartzofeldspathic gneiss that equilibrated at much lower pressures.
Whitney, Donna L., Rey, Patrice F., Roger, Francoise, Respaut, Jean-Patrick, Teyssier, Christian   +4 more
core   +1 more source

Eclogite-facies shear zones--deep crustal reflectors? [PDF]

, 1994
Strongly foliated eclogite-facies rocks in 30-150 m thick shear zones of Caledonian age occur within a Grenvillian garnet granulite-facies gabbro-anorthosite terrain in the Bergen Arcs of Norway. The predominant eclogite-facies mineral assemblages in the
Theresa M. Boundy, Rey, Patrice, Håkon Austrheim, Patrice Rey, David M. Fountain, Fountain, David M., Boundy, Theresa M., Austrheim, Hakon   +7 more
core   +1 more source

Discovery of a >1,000km Cambrian eclogite-bearing high-pressure metamorphic belt in the Central Asian Orogenic Belt: Implications for the final closure of the Pan-Rodinian Ocean

, 2022
The immense Central Asian Orogenic Belt (CAOB) witnessed the transition from the Pan‐Rodinian Mirovoi Ocean to the Paleo-Asian Ocean, but the final closure of the Mirovoi Ocean remains unexplored so far.
Mingshuai Zhu
core   +1 more source

Petro-structural geology of the Northern Adula Nappe Complex (Central Penninic Alps, Switzerland)

Journal of Maps
The Adula Nappe Complex is the largest fragment of Penninic continental crust in the Central Alps, where it deformed alongside the Valais Ocean ophiolites and metasediments.
Fabio Zulbati
doaj   +1 more source

Origin and evolution of the Variscan Léon eclogites: insights from zircon and garnet petrochronology [PDF]

European Journal of Mineralogy
Eclogites record the deep burial and exhumation of crustal terranes, which are key tectonic markers in the evolution of orogenic belts. Unraveling the evolution of eclogites and eclogite-bearing terranes may nevertheless be challenging, especially in old
L. Tual, C. Authemayou, C. Lotout, C. Lotout, M. A. Smit, M. A. Smit, K. Musiyachenko, D. Bussien Grosjean, E. Kooijman, E. Bruand   +9 more
doaj   +1 more source

Discovery of eclogite facies carbonate rocks from the LindÅs Nappe, Caledonides, Western Norway [PDF]

, 2002
Eclogite facies carbonate rocks have been discovered associated with the granulite–eclogite transitional rocks within Bergen Arc system, Caledonian Orogen of western Norway. The local occurrences of marbles and calc-silicates are found subparallel to the
Essene, E. J., Mezger, K., Boundy, T. M., Essene, Eric J., Donohue, C. L., Austrheim, H., Boundy, Theresa M., Austrheim, Hakon   +7 more
core   +2 more sources

Experimental Evaluation and Optimisation of Sealed‐Tube Combustion Methods for Silicate Nitrogen Extraction

Rapid Communications in Mass Spectrometry, Volume 41, Issue 1, 15 January 2027.
ABSTRACT Rationale Nitrogen (N) abundance and isotopic compositions in silicate rocks are commonly measured by sealed‐tube continuous‐flow isotope ratio mass spectrometry (CF‐IRMS), but combustion protocols vary widely. It remains uncertain how the quality of data obtained from different published methods compares for differing sample types. Methods To
Fawn S. M. Holland, Sami Mikhail, Kirsten W. Y. Wong, Abu Saeed Baidya, Eva E. Stüeken   +4 more
wiley   +1 more source

Geochemistry of eclogites Beloretsk complex (the Southern Urals) and genetic nature of their protoliths

Литосфера, 2017
The article gives a detailed mineralogical, petrographic and petrogeochemical characteristics of eclogites of the Beloretsk metamorphic complex (BMK).
S. G. Kovalev, E. A. Timofeeva
doaj   +2 more sources