首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Mixed siliceous-carbonate sedimentation in a Late Cretaceous epeiric sea: New evidence from the eastern Russian Platform
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Mixed siliceous-carbonate sedimentation in a Late Cretaceous epeiric sea: New evidence from the eastern Russian Platform

机译:混合硅酸盐沉积在晚餐脑卒中海中:来自俄罗斯东部平台的新证据

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摘要

The knowledge of mixed siliceous-carbonate sedimentary rocks requires significant extension. Lithological and geochemichal peculiarities of the Late Turonian-Middle Campanian deposits have been examined in the Mezino-Lapshinovka section of the Uljanovsk-Saratov Trough (eastern Russian Platform). Three main lithologies are gaizes (a kind of mixed siliceous-carbonate rocks), marls, and claystones. These include opal-CT, calcite, and clay minerals in different proportions. The Fe content in the rocks varies from 4480 ppm to 49350 ppm. The Mn content is lower in gaizes than in marls. Carbon isotope values vary slightly through the Late Turonian-Early Santonian (2.38-3.75 parts per thousand); the delta C-13 values decrease sharply to -3.84 parts per thousand in the latest Coniacian claystones and again increase in the Campanian marls. The documented mineralogy and geochemical proxies permit to establish fluctuating water oxygenation in the epeiric sea that embraced the study territory, to hypothesize input of volcanic material from distant sources (the North Atlantic and the Black Sea regions), and to confirm the relative sea-level rise in the Campanian. The weak oxygen depletion in the form of establishment of non-sulfidic (ferruginous) conditions is interpreted for the latest Coniacian on the basis of the siderite and hematite presence (1-2%), the high Fe content (49350 ppm), and the high Fe/Al ratio (1.96). This regional event is related hypothetically to the Ocean Anoxic Event 3 (OAE3). Together with the evidence from the other regions, this interpretation implies possible global extent of the OAE3.
机译:混合硅酸盐沉积岩的知识需要显着的延伸。在Uljanovsk-Saratov Trough(东俄罗斯平台东部)的Mezino-Lapshinovka部分,综述了泰国南京中小型坎帕尼克矿床的岩性和地球化学特性。三个主要岩性是(一种混合的硅质碳酸盐岩),玛尔和粘土。这些包括不同比例的Opal-CT,方解石和粘土矿物质。岩石中的Fe含量从4480 ppm变化到49350 ppm。 Mn含量比Marls较低。碳同位素价值略有通过晚期的Turonian-option Santonian(每千份2.38-3.75份)变化; Delta C-13值在最新的Coniacian ColaYstones中急剧下降至-3.84份千分之一,并再次增加坎皮尼亚尔马尔。所记录的矿物学和地球化学代理允许在施加的脑海中建立波动的水氧合,这些水中氧气接受了研究领域,假设来自遥远来源(北大西洋和黑海地区)的火山材料的投入,并确认相对海平面在坎皮尼亚人崛起。在硫酸盐和赤铁矿存在(1-2%)的基础上,解释了非亚硫酸盐(铁致)条件的形式的弱氧耗尽,以最新的Coniacian(1-2%),高Fe含量(49350 ppm)和高Fe / Al比率(1.96)。该区域事件与海洋缺氧事件3(OAE3)进行假设相关。与其他地区的证据一起,这种解释意味着OAE3可能的全球范围。

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