Links to volcanism and climate ? Sr during the Middle Ordovician ( Darriwilian ) : 86 Sr / 87 A major drop in seawater
Links to volcanism and climate ? Sr during the Middle Ordovician ( Darriwilian ) : 86 Sr / 87 A major drop in seawater
复制标题
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Seth A. Young;M. Saltzman;K. Foland;J. Linder;L. Kump
中科院分区：
文献类型：
--
作者：
Seth A. Young;M. Saltzman;K. Foland;J. Linder;L. Kump
中奥陶世海水87Sr/86Sr的大幅下降是整个显生宙中速度最快的。来自内华达州的87Sr/86Sr新测量表明，快速移动始于Darriwilian阶段上部的Pygodus serra牙形石带。我们使用一个数值模型来探讨火山风化为海洋提供非放射性成因Sr通量的假设。火山排出气体和风化作用消耗的二氧化碳之间的紧密平衡产生了稳定的二氧化碳分压水平和贯穿卡天中部的气候，与最近的奥陶纪古温度估计相一致。在喀天纪晚期，火山风化作用继续，释气减少，导致了一个冷却期，导致了著名的奥陶世末冰期。下载自：geology.gsapubs.org
A large drop in seawater 87Sr/86Sr during the Middle Ordovician was among the most rapid in the entire Phanerozoic. New 87Sr/86Sr measurements from Nevada indicate that the rapid shift began in the Pygodus serra conodont zone of the upper Darriwilian Stage. We use a numerical model to explore the hypothesis that volcanic weathering provided the fl ux of nonradiogenic Sr to the oceans. A close balance between volcanic outgassing and CO2 consumption from weathering produced steady pCO2 levels and climate through the middle Katian, consistent with recent Ordovician paleotemperature estimates. In the late Katian, outgassing was reduced while volcanic weathering continued, and resulted in a cooling episode leading into the well-known end-Ordovician glaciation. on 13 October 2009 geology.gsapubs.org Downloaded from