Washington
发表于 2025-3-21 19:48:08
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颂扬本人
发表于 2025-3-21 20:50:27
Petrology and Geochemistry of Oldoinyo Lengai Lavas Extruded in November 1988: Magma Source, Ascentpatterns indicate that the carbonatite is highly fractionated. Compositional variations arise mainly between phenocryst-rich and aphyric varieties, with the aphyric variety being richer in K, Ba, Cl, F and Rb. More subtle variations in Fe, Mn, Pb and Zn may reflect groundmass sulphide sedimentation.
Commission
发表于 2025-3-22 03:35:12
The Trace Element Composition and Petrogenesis of Natrocarbonatites,s volcano, and cannot be used to model petrogenetic schemes for carbonatites in general. Liquid immiscibility is a viable model for the derivation of natrocarbonatite from an exceptionally peralkaline nephelinite.
Ganglion
发表于 2025-3-22 08:38:18
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magnate
发表于 2025-3-22 09:50:09
What Are the Parental Magmas at Oldoinyo Lengai?,stonite, a common phenocryst phase in nephelinites at Oldoinyo Lengai. Olivine melilitites occur at Oldoinyo Lengai and at young tuff cones nearby; these have alkali contents that are abnormally high, even for these rocks. Olivine melilitites cannot fractionate to form phonolites; relatively low-alk
谈判
发表于 2025-3-22 16:52:01
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谈判
发表于 2025-3-22 19:50:03
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LEVY
发表于 2025-3-22 23:27:59
Nonlinear Dielectric Susceptibilitiesears, during which the active northern crater has been filled. The ash eruptions have resulted in changes in crater morphology, and have been followed by periods of quiescence, prior to renewed lava effusion. Extrusion of peralkaline combeite nephelinite earlier this century (in 1917?), together wit
边缘
发表于 2025-3-23 03:13:28
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Accrue
发表于 2025-3-23 09:08:48
Nonlinear Dielectric Susceptibilitiess volcano, and cannot be used to model petrogenetic schemes for carbonatites in general. Liquid immiscibility is a viable model for the derivation of natrocarbonatite from an exceptionally peralkaline nephelinite.