期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 169, 期 6, 页码 713-721出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/jgs2011-092
关键词
-
资金
- Science Foundation Ireland (SFI) [07-RFP-GEOF207]
- Science Foundation Ireland (SFI) [07/RFP/GEOF207] Funding Source: Science Foundation Ireland (SFI)
We present three new high-precision U-Pb zircon chemical abrasion-isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) dates from western European Carboniferous diagenetically altered volcanic ash layers (bentonites and tonsteins) that occur interbedded with cyclic siliciclastic sedimentary rocks. The dates constrain the average periodicity of western European late Carboniferous (Arnsbergian to early Langsettian) cyclic sedimentation to between 89 and 124 ka per cycle. This is consistent with the 100 ka 'short' eccentricity Milankovitch cycle and supports previous suggestions that the cycles are the product of glacio-eustasy. Cyclostratigraphic tuning of Namurian cycles to the 100 ka eccentricity cycle revises the timing of the global Mississippian-Pennsylvanian boundary to c. 323.9 Ma. CA-ID-TIMS dates also facilitate correlation between different facies belts where biostratigraphical correlations are difficult. Correlation between eastern and western European sequences confirms that the base of the Moscovian stage is located within the Duckmantian (Westphalian B) western European regional substage.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据