High-precision U-Pb zircon age constraints on the duration of rapid biogeochemical events during the Ludlow Epoch (Silurian Period)

被引：29
|
作者：
Cramer, Bradley D. [1 ]
Schmitz, Mark D. [2 ]
Huff, Warren D. [3 ]
Bergstroem, Stig M. [4 ]
机构：
[1] Univ Iowa, Dept Earth & Environm Sci, Iowa City, IA 52242 USA
[2] Boise State Univ, Dept Geosci, Boise, ID 83725 USA
[3] Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
[4] Ohio State Univ, Sch Earth Sci, Div Earth Hist, Columbus, OH 43210 USA
来源：
JOURNAL OF THE GEOLOGICAL SOCIETY | 2015年 / 172卷 / 02期
基金：
美国国家科学基金会;
关键词：
CARBON-ISOTOPE EXCURSIONS; PODOLIA UKRAINE; STRATIGRAPHY; SWEDEN; CHEMOSTRATIGRAPHY; FLUCTUATIONS; BENTONITES; ORDOVICIAN; CONODONTS; GOTLAND;
D O I：
10.1144/jgs2014-094
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Precise determinations of the rates and durations of Palaeozoic biogeochemical events are largely unavailable. Here, we present two new high-precision U-Pb (zircon) dates from volcanic ash deposits from the Ludlow Series (Silurian System) of Podolia, Ukraine, that yielded weighted mean Pb-206/U-238 dates of 424.08 +/- 0.20 (0.29) [0.53] Ma and 422.91 +/- 0.07 (0.21) [0.49] Ma (analytical, tracer and total uncertainties). These new dates bracket the largest post-Cambrian global carbon cycle perturbation (Lau Excursion) and constrain the 'Ludlow Rise' in Sr-87/Sr-86. These chronostratigraphically well-controlled dates improve the calibration of the Silurian time scale and provide the first determinations of the rates of biogeochemical change during the Ludlow Epoch.
引用
收藏
页码：157 / 160
页数：4
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