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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Sedimentary organic matter characterization of the Triassic-Jurassic boundary GSSP at Kuhjoch (Austria)
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Sedimentary organic matter characterization of the Triassic-Jurassic boundary GSSP at Kuhjoch (Austria)

机译：Kuhjoch（奥地利）三叠纪-侏罗纪边界GSSP的沉积有机质表征

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The Triassic Jurassic (T-J) boundary interval coincides with enhanced extinction rates in the marine realm and pronounced changes in terrestrial ecosystems on the continents. It is further marked by distinct negative excursions in the delta C-13(org) and delta C-13(carb) signature that may represent strong perturbations of the global carbon cycle. We present integrated geochemical, stable-isotope and palynological data from the Kuhjoch section, the Global boundary Stratotype Section and Point (GSSP) for the base of the Jurassic (Northern Calcareous Alps, Austria). We show that the initial carbon isotope excursion (CIE), coinciding with the marine extinction interval and the formation of black shales in the western Tethys Eiberg Basin, is marked by only minor changes in kerogen type, which is mainly of terrestrial origin. Increased Total Organic Carbon (TOC) concentrations of 9% at the first half of the initial CIE coincide with Hydrogen Index (HI) values of over 600 mg HC/g TOC. The high correlation (with R-2 = 0.93) between HI values and terrestrial Cheirolepidiaceaen conifer pollen suggests a terrestrial source for the hydrogen enriched organic compounds. The lack of major changes in source of the sedimentary organic matter suggests that changes in the delta C-13(org) composition are genuine and represent true disturbances of the global C-cycle. The sudden decrease in total inorganic carbon (TIC) concentrations likely represents the onset of a biocalcification crisis. It coincides with a 4.5 parts per thousand negative shift in delta C-13(org) values and possibly corresponds to the onset of CAMP related volcanic activity. The second half of the initial CIE is marked by the dramatic increase of green algae remains in the sediment. The simultaneous increase of the C-org/N-tot ratio suggests increased marine primary production at the final stage of black shale formation. (c) 2010 Elsevier B.V. All rights reserved.
机译：三叠纪侏罗纪（T-J）的边界区间与海洋界灭绝速率的提高以及各大陆陆地生态系统的明显变化相吻合。 δC-13（org）和δC-13（carb）信号特征中明显的负偏移可能进一步标志着这种变化，这可能代表了全球碳循环的强烈扰动。我们提供了侏罗纪（北钙质阿尔卑斯山，奥地利）基地的Kuhjoch剖面，全球边界地层剖面和点（GSSP）的综合地球化学，稳定同位素和孢粉学数据。我们显示，最初的碳同位素偏移（CIE）与海洋灭绝间隔和特提斯艾伯格盆地西部黑色页岩的形成相吻合，其特征是干酪根类型仅有细微变化，这主要是陆源。在初始CIE的上半年，总有机碳（TOC）浓度增加了9％，而氢气指数（HI）值超过600 mg HC / g TOC。 HI值与陆地Cheirolepidiaceaen针叶树花粉之间的高度相关性（R-2 = 0.93）表明富含氢的有机化合物的陆地来源。沉积有机物来源缺乏重大变化表明，δC-13（org）组成的变化是真实的，代表了全球C循环的真正扰动。总无机碳（TIC）浓度的突然下降可能代表了生物钙化危机的开始。它与增量C-13（org）值的千分之4.5负移相吻合，并且可能与CAMP相关的火山活动开始有关。初始CIE的后半部分以沉积物中绿藻残留的急剧增加为标志。 C-org / N-tot比值的同时增加表明在黑色页岩形成的最后阶段海洋初级产量增加。 （c）2010 Elsevier B.V.保留所有权利。

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