標(biāo)題: Titlebook: Carbonatite Volcanism; Oldoinyo Lengai and Keith Bell,J?rg Keller Book 1995 Springer-Verlag Berlin Heidelberg 1995 chemistry.geochemistry. [打印本頁] 作者: Washington 時間: 2025-3-21 19:48
書目名稱Carbonatite Volcanism影響因子(影響力)
作者: 頌揚本人 時間: 2025-3-21 20:50
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.作者: Commission 時間: 2025-3-22 03:35
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.作者: Ganglion 時間: 2025-3-22 08:38 作者: magnate 時間: 2025-3-22 09:50
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作者: 談判 時間: 2025-3-22 16:52 作者: 談判 時間: 2025-3-22 19:50 作者: LEVY 時間: 2025-3-22 23:27
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作者: 邊緣 時間: 2025-3-23 03:13 作者: Accrue 時間: 2025-3-23 09:08
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.作者: Scintillations 時間: 2025-3-23 12:59
Chaos and Stability in Some Modelsagma at the time of eruption can be calculated to have had (.Th/.Th) ~ 5.7 ± 0.7. A valid earlier interpretation was that these magmas formed 7 years before eruption..The 1988 lavas have-compositions consistent with two end-member models. If the magma formed and separated at one instant, then the ma作者: Statins 時間: 2025-3-23 14:33
Higher Order Scalar Difference Equationsstonite, 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作者: Anthrp 時間: 2025-3-23 18:32
Chaos and Stability in Some Modelstion (P ≤ 200 MPa). Exsolution of an alkali-rich carbonate liquid from a silicate melt during further cooling and differentiation buffers the peralkalinity of the residual silicate liquid at near constant peralkalinity ([Na+K]/Al≈2.15). At very low pressure (P ≤ 35 MPa) and CO. undersaturated condit作者: Melanocytes 時間: 2025-3-24 02:05
Norayr Matevosyan,Peter A. Markowichition was derived and the peridotite composition (Hawaiian Pyrolite) with which the Wallace and Green (1988) composition was equilibrated..The phase relationships of CM1 also demonstrate the existence of a decarbonation reaction to lower pressures and higher temperatures which results in the formati作者: 藥物 時間: 2025-3-24 03:51 作者: 異常 時間: 2025-3-24 06:53 作者: Esophagus 時間: 2025-3-24 14:34 作者: 修飾語 時間: 2025-3-24 16:25 作者: audiologist 時間: 2025-3-24 20:26 作者: debris 時間: 2025-3-24 23:49 作者: 發(fā)微光 時間: 2025-3-25 07:24
IAVCEI Proceedings in Volcanologyhttp://image.papertrans.cn/c/image/221681.jpg作者: morale 時間: 2025-3-25 09:03 作者: MAIM 時間: 2025-3-25 13:12
Nonlinear Dielectric Susceptibilitieshe pioneering work by J.B. Dawson on the natrocarbonatite lavas of the 1960–61 eruption, this volcano has held an understandable fascination for volcanologists, geochemists and petrologists, and has resulted in considerable debate as to whether the natrocarbonatite is a primary or derivative melt.作者: 創(chuàng)造性 時間: 2025-3-25 19:22
Nonlinear Dielectric Susceptibilities extinct, crater. Following a period of erosion, black nephelinitic ashes were erupted starting about 1250 a from a new northern crater, which has been the site of subsequent activity; altered natrocarbonatite lava blocks occur in these tuffs. Natrocarbonatite lava was first recorded in the summit a作者: BILK 時間: 2025-3-25 21:31 作者: 土坯 時間: 2025-3-26 00:56
Nonlinear Dielectric Susceptibilitiesstem. Observations of bubbles bursting in a lava lake, and sudden changes in magma level and vesicularity at active vents are consistent with the degassing model developed by Jaupart and Vergniolle (1988, 1989), and suggest that the shallow plumbing system comprises several small (<10-m radius) cham作者: 相容 時間: 2025-3-26 04:36 作者: occult 時間: 2025-3-26 08:38
Nonlinear Dielectric Susceptibilitiese data, together with trace element data for the phenocryst phases nyerereite and gregoryite and for a related peralkaline nephe-linite, provide the basis for discussing petrogenetic hypotheses related to alkalic carbonatites. Natrocarbonatites are characterized, compared to the more common calcioca作者: 共同生活 時間: 2025-3-26 15:00 作者: 閑逛 時間: 2025-3-26 20:29
6.1.1.3 Crystal-name abbreviations,elation, and closely follow the East African Carbonatite Line (EACL). The .Nd/.Nd ratios of the lavas range from 0.51249 to 0.51269, those of plutonic blocks from 0.51174 to 0.51270. The .Sr/.Sr of the lavas range from 0.70414 to 0.70512; plutonic blocks range from 0.70378 to 0.70861. The nephelinit作者: 分開如此和諧 時間: 2025-3-27 00:14 作者: 攀登 時間: 2025-3-27 04:01
Chaos and Stability in Some Modelse unique constraints on the timing and mechanism of magmagenesis. Measured disequilibria are consistent with an origin of natrocarbonatite by immiscible exsolution of between 5 and 25 wt% carbonatite from a silicate melt. The particular parent silicate magma cannot be definitively constrained; it co作者: 彎曲的人 時間: 2025-3-27 07:03
https://doi.org/10.1007/978-94-017-0417-5re is no need to elevate the Na content by dissolution of bedded evaporites or interaction with saline brines. The stable and radiogenic isotope signatures of the natrocarbonatites are typical of magmatic rocks and differ significantly from those of trona deposits. Nd and Sr isotopic compositions of作者: 滲透 時間: 2025-3-27 13:04
Higher Order Scalar Difference Equationscontent. Experimental studies have demonstrated that natrocarbonatite can be produced by liquid immiscibility from strongly peralkaline nephelinites, which are found at Oldoinyo Lengai in close association with natrocarbonatite. If natrocarbonatite is formed by liquid immiscibility from a CO.-satura作者: Morose 時間: 2025-3-27 16:12 作者: Working-Memory 時間: 2025-3-27 20:24 作者: 老巫婆 時間: 2025-3-27 23:29 作者: Oscillate 時間: 2025-3-28 03:12
6.1.1.3 Crystal-name abbreviations,tes at the surface produce distinctly higher δ.O, and also heavier δ.C values. A recent natrocarbonatite exposed to weathering for only several weeks shows δ.O and δ.C values of 17.4 and ?3.3‰, respectively.作者: 使成整體 時間: 2025-3-28 07:22
Stable Isotope Characteristics of Recent Natrocarbonatites from Oldoinyo Lengai,tes at the surface produce distinctly higher δ.O, and also heavier δ.C values. A recent natrocarbonatite exposed to weathering for only several weeks shows δ.O and δ.C values of 17.4 and ?3.3‰, respectively.作者: 季雨 時間: 2025-3-28 12:40 作者: 牛馬之尿 時間: 2025-3-28 15:19 作者: 樹膠 時間: 2025-3-28 19:27
Nonlinear Dielectric Susceptibilitiesssing model developed by Jaupart and Vergniolle (1988, 1989), and suggest that the shallow plumbing system comprises several small (<10-m radius) chambers containing transient foam layers which may, in turn, be connected at depth to a single, larger chamber.作者: 縮短 時間: 2025-3-29 00:39
Field Observations and Measurements of the Physical Properties of Oldoinyo Lengai Alkali Carbonatitd that lava flows erupted on Oldoinyo Lengai are smaller, though morphologically similar to basaltic lavas erupted on Mount Etna and Hawaii. Factors governing flow lengths, morphology and the development of compound flow fields on Oldoinyo Lengai are identical to those on basaltic volcanoes.作者: curettage 時間: 2025-3-29 05:00 作者: 承認(rèn) 時間: 2025-3-29 09:48
Nonlinear Dielectric Susceptibilitieshelinite lava is documented. The CL spectroscopy shows that Mn. is the main activator in wollastonite, combeite, and in the green cores of apatite. The spectral analysis of blue apatite indicates REE activation, considered typical of apatites from carbonatites.作者: 有害處 時間: 2025-3-29 14:43
6.1.1.3 Crystal-name abbreviations,er slightly depleted relative to bulk Earth and CHUR. Isotopic variations indicate that the rocks from Oldoinyo Lengai cannot be derived by magmatic differentiation alone; at least two spatially related components are involved in the origin of rocks from Oldoinyo Lengai.作者: 捐助 時間: 2025-3-29 16:34 作者: Hippocampus 時間: 2025-3-29 23:23
Cathodoluminescence Observations of Natrocarbonatites and Related Peralkaline Nephelinites at Oldoihelinite lava is documented. The CL spectroscopy shows that Mn. is the main activator in wollastonite, combeite, and in the green cores of apatite. The spectral analysis of blue apatite indicates REE activation, considered typical of apatites from carbonatites.作者: minaret 時間: 2025-3-30 01:33
Nd and Sr Isotope Systematics of the Active Carbonatite Volcano, Oldoinyo Lengai,er slightly depleted relative to bulk Earth and CHUR. Isotopic variations indicate that the rocks from Oldoinyo Lengai cannot be derived by magmatic differentiation alone; at least two spatially related components are involved in the origin of rocks from Oldoinyo Lengai.作者: TOXIN 時間: 2025-3-30 05:37
An Assessment of the Alleged Role of Evaporites and Saline Brines in the Origin of Natrocarbonatiteclearly magmatic. If natrocarbonatites were either remobilized or dissolved trona deposits, the resulting melt would have to acquire almost all of the chemical features observed in known carbonatites from East Africa.作者: 友好 時間: 2025-3-30 10:16
Introduction,he pioneering work by J.B. Dawson on the natrocarbonatite lavas of the 1960–61 eruption, this volcano has held an understandable fascination for volcanologists, geochemists and petrologists, and has resulted in considerable debate as to whether the natrocarbonatite is a primary or derivative melt.
