Comments on the BLAG model: the carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years [0.03%]
关于BLAG模型的注记：碳酸盐-硅酸盐地球化学循环及其对过去1亿年大气二氧化碳的影响
J F Kasting
J F Kasting
A self-consistent method of determining initial conditions for the model presented by Berner, Lasaga, and Garrels (1983) (henceforth, the BLAG model) is derived, based on the assumption that the CO2 geochemical cycle was in steady state at ...
Organic acids in hydrothermal solutions: standard molal thermodynamic properties of carboxylic acids and estimates of dissociation constants at high temperatures and pressures [0.03%]
水热溶液中的有机酸：羧酸的标准摩尔热力学性质及其高温高压离解常数的估算
E L Shock
E L Shock
Experimental standard partial molal volumes, heat capacities, and entropies as well as apparent standard partial molal enthalpies and Gibbs free energies of mono- and dicarboxylic acids and their anions at low temperatures and pressures are...
The post-Paleozoic chronology and mechanism of 13C depletion in primary marine organic matter [0.03%]
后古生代主要海相有机质13C亏损的时限与机制
B N Popp,R Takigiku,J M Hayes et al.
B N Popp et al.
Carbon-isotopic compositions of geoporphyrins have been measured from marine sediments of Mesozoic and Cenozoic age in order to elucidate the timing and extent of depletion of 13C in marine primary producers. These results indicate that the...
H D Holland,C R Feakes,E A Zbinden
H D Holland
Within the 1800 to 1900 my old Flin Flon-Snow Lake greenstone belt, Amisk Group volcanics are overlain by Missi Group fluvial sediments. Several localities along the Missi-Amisk contact, the volcanics show evidence of subaerial weathering. ...
R A Berner,D E Canfield
R A Berner
A mathematical model has been constructed that enables calculation of the level of atmospheric O2 over the past 570 my from rates of burial and weathering of organic carbon (C) and pyrite sulfur (S). Burial rates as a function of time are c...
The carbon-isotopic composition of Proterozoic carbonates: Riphean successions from northwestern Siberia (Anabar Massif, Turukhansk Uplift) [0.03%]
北西西伯利亚安巴尔斜坡和图鲁汉斯克高地赖因世碳酸盐岩的碳同位素组成
A H Knoll,A J Kaufman,M A Semikhatov
A H Knoll
Thick carbonate-dominated successions in northwestern Siberia document secular variations in the C-isotopic composition of seawater through Mesoproterozoic and early Neoproterozoic (Early to early Late Riphean) time. Mesoproterozoic dolomit...
Shell structure and distribution of Cloudina, a potential index fossil for the terminal Proterozoic [0.03%]
Cloudina的壳体结构及其分布是终端元古代潜在的重要标准化石
S W Grant
S W Grant
Cloudina-bearing biosparites and biomicrites in the lower part of the Nama Group, Namibia, contain a wide morphological diversity of shell fragments that can all be attributed to the two named species C. hartmannae and C. riemkeae. The curv...
Carbonate deposition during the late Proterozoic Era: an example from Spitsbergen [0.03%]
晚元古代碳酸盐沉积——斯匹次卑尔根群岛的一个例子
A H Knoll,K Swett
A H Knoll
Carbonate sediments reflect the physico-chemical and biological circumstances of their formation; thus, features of limestones and dolomites may provide insights into both environmental and evolutionary change through geological time. The U...
A paleoweathering profile from Griqualand West, South Africa: evidence for a dramatic rise in atmospheric oxygen between 2.2 and 1.9 bybp [0.03%]
南非格拉夸兰德西太古代风化剖面及其对大气氧含量变化的响应
H D Holland,N J Beukes
H D Holland
A core drilled near Wolhaarkop in Griqualand West, South Africa, intersected highly oxidized Kuruman Iron Formation below red beds of the Gamagara Formation. The lateral equivalents of the Kuruman Iron Formation in this drill hole consist l...
D E Canfield
D E Canfield
Sulfate reduction rates calculated from about 200 DSDP pore water sulfate profiles have been contoured and plotted on a map covering most areas of the world ocean. Rates show a remarkable spatial consistency, with high rates observed near t...