Results 101 to 110 of about 11,494 (230)
Metallogenic features of Miocene porphyry Cu and porphyry-related mineral deposits in Ecuador revealed by Re-Os, 40Ar/39Ar, and U-Pb geochronology [PDF]
, 2018 Mineralization and alteration events at ten Miocene porphyry Cu and porphyry-related epithermal mineral deposits in southern, central, and northern Ecuador were dated by means of molybdenite Re-Os, biotite and alunite 40Ar/39Ar, and titanite U-Pb ...
Barra, Fernando +4 more
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CaSiO3 perovskite at lower mantle pressures [PDF]
, 2005 We investigate by first-principles the structural behavior of CaSiO3 perovskite up to lower mantle pressures. We confirm that the cubic perovskite modification is unstable at all pressures.
Brodholt, J +3 more
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CrystalsTitanites can be excellent markers of element transfer in medium-temperature retrograde metamorphism. Euhedral titanites from several alpine fissures from Mont Blanc, particularly those of Périades and Courtes, crystallised at the end of the main quartz ...
Michel Cathelineau, Chantal Peiffert
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Acta Crystallographica Section A Foundations of Crystallography, 2010 Tobias Beirau +2 more
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Nb and Ta diffusion in titanite [PDF]
Chemical Geology, 2015 Abstract Chemical diffusion of Nb and Ta under anhydrous, pO 2 -buffered conditions has been measured in natural titanite. The source of diffusants were mixtures of CaSiO 3 , TiO 2 , and Al 2 O 3 powders, with either Nb or Ta oxides added. Experiments were run in evacuated sealed silica glass ampoules with solid buffers (buffered at NNO). Rutherford
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Petrogenetic significance of ocellar camptonite dykes in the Ditrau Alkaline Massif, Romania [PDF]
, 2014 Camptonite dykes intrude the rift-related Mesozoic igneous body of the Ditrău Alkaline Massif, Eastern Carpathians, Romania. We present and discuss mineral chemical data, major and trace elements, and the Nd isotopic compositions of the dykes in order to
Batki, Anikó +3 more
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Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil [PDF]
, 1962 The Rio Espinharas pluton, northeastern Brazil, belongs to the shoshonitic series and consists mainly of syenogranite, quartz-monzonite and porphyritic quartz-monzonite, but diorite, quartz-monzodiorite, quartz-syenite and microsyenogranite also occur ...
Campos, T. F. C. +2 more
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Notes on alunite, psilomlanite, and titanite [PDF]
Proceedings of the United States National Museum, 1916 (Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Горные науки и технологииThe Ta Phoi copper deposit, located in the northeastern Phan Si Pan zone, Northwestern Vietnam, is a significant site of Neoproterozoic Cu mineralization.
K. T. Hung, D. X. Ngo
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Записки Горного институтаThe article reports on the presence of minerals of the crichtonite group (MCG) in ooids of mineralized volcaniclastic rocks of the Rudnogorskoe iron deposit (Eastern Siberia).
Nuriya R. Ayupova +4 more
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