作者: Cirrhosis 時間: 2025-3-21 21:34
Die Ewige Wiederkehr des Gleichen,to draw a balance sheet of the work performed in a scientific venture that, in the terminal assessment of the IGCP Board (1989), has been rated “a highly successful project producing a number of major advances in the field and resulting in a number of important publications.” Since the inauguration 作者: Tdd526 時間: 2025-3-22 01:27
https://doi.org/10.1007/978-3-476-03192-1influx of solar energy is about four orders of magnitude greater than the outflow of internal energy. Although the outflow of internal energy has been limited, the apparently continuous outflow of volatiles, including carbon dioxide, has resulted in intensive weathering throughout most of Earth hist作者: 迅速飛過 時間: 2025-3-22 08:09
,Walter Benjamin — Versuch einer Würdigung,This essay attempts to aid the search by outlining diagnostic versus common but not necessarily distinctive features of Precambrian paleosols. Three general classes of criteria can be used to recognize Precambrian paleosols: biological traces, soil horizons, and soil structures..Precambrian paleosol作者: 音樂會 時間: 2025-3-22 10:13
Das Weib ?voll bet?ubender Lust am Wehtun?—H.S, and a N. —O. —CO. atmosphere. Thus, a primordial, possible Early Archean, and a present-day atmosphere have been simulated. The experiments were carried out in an especially designed apparatus equipped with pH and redox electrodes to monitor pH and the oxidation poten-tial over the whole perio作者: Lineage 時間: 2025-3-22 14:15
https://doi.org/10.1007/978-3-476-04308-5greenschist facies regional metamorphism during the Svecofennian Orogeny 1.9 Ga ago. Interpretation of the Hokkalampi paleosol is based on variations in the chemical and mineral composition of its profiles and its association with overlying aluminous and quartz arenitic metasedimentary rocks. The pa作者: Lineage 時間: 2025-3-22 18:11 作者: 符合你規(guī)定 時間: 2025-3-22 21:47 作者: 領(lǐng)帶 時間: 2025-3-23 02:13
,?Rheinische Kirche? — Kirche im Rheinland, shale contains such high concentrations of A1.O. (21.9%) and K.O (6.5%) that it is compositionally similar to Precambrian paleosols which developed on a variety of rock types. It is proposed that the alumina was concentrated from contemporaneously exposed dolostone through the removal of over 98 % 作者: ADAGE 時間: 2025-3-23 08:41 作者: BRAND 時間: 2025-3-23 10:01 作者: 入會 時間: 2025-3-23 15:17 作者: cacophony 時間: 2025-3-23 18:40 作者: 駭人 時間: 2025-3-23 22:24
https://doi.org/10.1007/978-3-476-03384-0 evolutionary theory. Their assignment to either the prokaryotes or eukaryotes on this basis may be equivocal and controversial. Such systematic data are used, however, to predict the physical environment during these periods, which subsequently impacts on the theory of the evolution of the Earth. I作者: reptile 時間: 2025-3-24 04:37 作者: bromide 時間: 2025-3-24 09:52
https://doi.org/10.1007/978-3-476-03550-9obilization processes involved in kerogen paragenesis in ore-bearing metasediments. The present study was undertaken to delineate some of the relationships at this location between uranium-poor kerogen globules and nearby U-rich stratiform kerogen seams. The latter are syngenetic with the host rocks作者: OVER 時間: 2025-3-24 13:12 作者: 領(lǐng)巾 時間: 2025-3-24 17:53 作者: Deject 時間: 2025-3-24 22:07 作者: gerrymander 時間: 2025-3-24 23:15
https://doi.org/10.1007/978-3-476-03192-1the atmosphere at the time of their formation and perhaps of the evolution of terrestrial life. This record has not yet been deciphered clearly, since the study of Precambrian paleosols is still in its infancy.作者: 啤酒 時間: 2025-3-25 06:30
,Walter Benjamin — Versuch einer Würdigung,in weathered carbonate rocks..Soil horizons of Precambrian paleosols, like those of the Phanerozoic, ideally exhibit gr dational changes in color, texture, mineralogy, and chemical composition downward from a sharp upper contact. Subsurface horizons enriched in quartz, clay, sesquioxides, or humus h作者: Injunction 時間: 2025-3-25 10:24
Das Weib ?voll bet?ubender Lust am Wehtun?monosulfide stability field on appropriate phase diagrams..Deduction of a rate law for the cation dissolution is difficult for our experiments because of the superimposition of reactions involving oxidation of Fe. , precipitation of FeS, and scavenging by precipitates of various solute species.作者: 正式通知 時間: 2025-3-25 14:46
https://doi.org/10.1007/978-3-476-04308-5ous iron, sodium, calcium, and magnesium. In the upper, most thoroughly weathered portions, ferric iron and potassium decrease, in some profiles considerably. Estimates of the extent of weathering (based on the ratio of alumina to more mobile components; the CIA index) are low near the bottom, moder作者: Pedagogy 時間: 2025-3-25 17:58 作者: 五行打油詩 時間: 2025-3-25 20:24
https://doi.org/10.1007/978-3-476-02927-0titic zone is characterized by enrichment of Ni, Cr, V and depletion of Mg, Ba, Sr, Ca, Na, Li, U, Cu, Pb, and Zn. Beneath this zone, the concentrations of all these elements approach those of the underlying protolith. The ferric/ferrous ratio decrease downward. Diagenetic alteration of the paleosol作者: entice 時間: 2025-3-26 02:55
,?Rheinische Kirche? — Kirche im Rheinland,ale occurs throughout virtually the entire preserved extent of the Transvaal Supergroup (250000 km.), presumably indicating widespread emergence in adjacent areas and the weathering of voluminous dolostone. The dissolved ions may well have reprecipitated within the basin as dolostone which subsequen作者: glowing 時間: 2025-3-26 06:08
https://doi.org/10.1007/978-3-476-02747-4 for all known paleosols and none of the other three models is considered adequate to account for all Precambrian paleosols. The abiologic model has been developed in recent literature and the exhalative model is introduced in this paper. In all four models, the composition of the ambient atmosphere作者: GLADE 時間: 2025-3-26 12:19 作者: GULF 時間: 2025-3-26 15:53
https://doi.org/10.1007/978-3-476-02739-9ng ratios C./C. in the total carbon flux from the surficial exchange reservoir to the sedimentary shell that has subsequently come to store the far bulk (≈6× 10. g) of carbon residing in and above the crust. Relying on the sensor function of δ .C., it is possible to identify numerous imbalances in t作者: 花費 時間: 2025-3-26 19:58
https://doi.org/10.1007/978-3-476-03512-7cates that eukaryotic algae became significant kerogen precursors at least 1.7 Ga ago. Along the southeastern margin of the Canadian Shield Aphebian black argillites (or, at Elliot Lake and Blind River, stratiform uraniferous kerogen layers in the Matinenda Formation) were probable sources for wides作者: multiply 時間: 2025-3-26 22:40 作者: GULLY 時間: 2025-3-27 03:21
https://doi.org/10.1007/978-3-476-03471-7hich raise the internal CO. concentrations of photoautotrophs and allow the maintenance of high levels of carbon fixation, would cause a partially closed system with respect to external CO. and a reduction in .C fractionation. Alternatively, or perhaps additionally, evolutionary pressures toward opt作者: 等級的上升 時間: 2025-3-27 07:06 作者: 過去分詞 時間: 2025-3-27 12:38
Book 1992misnomer. Neverthe- less, all contributions relate to the subject in the widest sense, and the reader should be reminded that much of the heterogeneity reflected by the volume de- rives from the fact that it is primarily a research report from a highly inter- disciplinary field rather than a textboo作者: 為寵愛 時間: 2025-3-27 14:33
d a grave misnomer. Neverthe- less, all contributions relate to the subject in the widest sense, and the reader should be reminded that much of the heterogeneity reflected by the volume de- rives from the fact that it is primarily a research report from a highly inter- disciplinary field rather than a textboo978-3-642-76886-6978-3-642-76884-2作者: 極大痛苦 時間: 2025-3-27 20:51
Introduction to Precambrian Weathering and Paleosolsthe atmosphere at the time of their formation and perhaps of the evolution of terrestrial life. This record has not yet been deciphered clearly, since the study of Precambrian paleosols is still in its infancy.作者: 壓倒 時間: 2025-3-27 23:49 作者: prosperity 時間: 2025-3-28 04:02
Experimental Procedures to Simulate Weathering Under Atmospheres Which May Have Characterized the Eamonosulfide stability field on appropriate phase diagrams..Deduction of a rate law for the cation dissolution is difficult for our experiments because of the superimposition of reactions involving oxidation of Fe. , precipitation of FeS, and scavenging by precipitates of various solute species.作者: 協(xié)議 時間: 2025-3-28 07:48
The Lower Proterozoic Hokkalampi Paleosol in North Karelia, Eastern Finlandous iron, sodium, calcium, and magnesium. In the upper, most thoroughly weathered portions, ferric iron and potassium decrease, in some profiles considerably. Estimates of the extent of weathering (based on the ratio of alumina to more mobile components; the CIA index) are low near the bottom, moder作者: 填滿 時間: 2025-3-28 14:18
Paleosol and Ore-Forming Processes in the Elliot Lake District of Canada minerals, i.e., brannerite, uraninite, monazite, and coffinite. Brannerite developed during dia gnesis (the “Pronto reaction”) within the conglomerate and perhaps also by weathering within uppermost soil horizons..Mineralization was related to soil formation in several ways. These include the loss 作者: Substitution 時間: 2025-3-28 17:23 作者: 聯(lián)邦 時間: 2025-3-28 19:39 作者: Foment 時間: 2025-3-28 22:53 作者: 繞著哥哥問 時間: 2025-3-29 06:49
Mantle Carbon: Concentration, Mode of Occurrence, and Isotopic Compositioneen —15 and — 19%o. The weighted mean of the distribution is — 7%o. The δ.C frequency distribution of carbonatite carbonates, a second major mantle carbon sample, shows very limited variability, is Gaussian, has a mean of — 5.4%o, and is distinct from that of diamonds. In comparison, the weighted me作者: bronchiole 時間: 2025-3-29 10:46 作者: 危險 時間: 2025-3-29 14:42
Precambrian Petroleum: A Decade of Changing Perceptionscates that eukaryotic algae became significant kerogen precursors at least 1.7 Ga ago. Along the southeastern margin of the Canadian Shield Aphebian black argillites (or, at Elliot Lake and Blind River, stratiform uraniferous kerogen layers in the Matinenda Formation) were probable sources for wides作者: 不給啤 時間: 2025-3-29 16:48
Paleontology and Biogeochemical Research: A Powerful Synergy isolates, and their host rocks, is now gaining momentum and must continue. We illustrate the successful application of this technique to determine the probable paleobiology of the microfossil . Zalessky 1917, and show it is the major source for certain Ordovician oils throughout many parts of the w作者: MILK 時間: 2025-3-29 22:10 作者: Affectation 時間: 2025-3-30 01:33 作者: FLACK 時間: 2025-3-30 07:22
An Assessment of the Precambrian/Cambrian Transition Events on the Basis of Carbon Isotope Records作者: NUDGE 時間: 2025-3-30 09:18
Manfred Schidlowski (Chairman),Stjepko Golubic,Phi作者: GET 時間: 2025-3-30 15:33 作者: Gingivitis 時間: 2025-3-30 18:36 作者: 老人病學(xué) 時間: 2025-3-30 22:36
urces ") after a decade of prolific activity. The picturesque solitude of Maria Laach Abbey in the Eifel Mountains (FRO) provided the appropriate setting for a conclave of some 80 specialists from the various walks of the field who, during the week of Sept. 19 - 23, 1988, strived hard to define the 作者: 等級的上升 時間: 2025-3-31 02:40 作者: 保守 時間: 2025-3-31 05:41 作者: 劇本 時間: 2025-3-31 10:44 作者: infantile 時間: 2025-3-31 16:28
Early Organic Evolution and Mineral and Energy Resources: A Farewell Address to IGCP Project 157to draw a balance sheet of the work performed in a scientific venture that, in the terminal assessment of the IGCP Board (1989), has been rated “a highly successful project producing a number of major advances in the field and resulting in a number of important publications.” Since the inauguration 作者: Alpha-Cells 時間: 2025-3-31 20:41
Introduction to Precambrian Weathering and Paleosolsinflux of solar energy is about four orders of magnitude greater than the outflow of internal energy. Although the outflow of internal energy has been limited, the apparently continuous outflow of volatiles, including carbon dioxide, has resulted in intensive weathering throughout most of Earth hist作者: 懸崖 時間: 2025-3-31 23:58 作者: Bother 時間: 2025-4-1 05:44
Experimental Procedures to Simulate Weathering Under Atmospheres Which May Have Characterized the Ea—H.S, and a N. —O. —CO. atmosphere. Thus, a primordial, possible Early Archean, and a present-day atmosphere have been simulated. The experiments were carried out in an especially designed apparatus equipped with pH and redox electrodes to monitor pH and the oxidation poten-tial over the whole perio作者: 搖曳 時間: 2025-4-1 09:04 作者: defendant 時間: 2025-4-1 13:22
