Mathematics – Logic
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.141..153i&link_type=abstract
Earth and Planetary Science Letters, vol. 141, Issue 1-4, pp.153-159
Mathematics
Logic
4
U/Pb, Upper Cambrian, Absolute Age, Calcite, Concretions, Time Scales, Alum Shale Formation, Elsevier: U/Pb, Upper Cambrian, Absolute Age, Calcite, Concretions, Time Scales, Alum Shale Formation
Scientific paper
The U---Pb dating of carbonate offers considerable potential for accurate and direct dating of sedimentary rocks. Here we show that carbonate concretions from the Upper Cambrian black shales in southern Scandinavia have remarkably high U to Pb ratios ( 238 U/ 204 Pb up to 288,000) permitting precise geochronology. A fine-crystalline early diagenetic concretion yields an age of 509.8 ± 5.1 Ma, providing an accurate age for the late Cambrian, whereas a coarse `cone-in-cone' concretion has yielded an age of 478.2 ± 4.9 Ma, defining the final stage of sediment compaction and indicating a protracted dewatering and diagenetic history. These results demonstrate the power of this method for directly calibrating the geological time scale and constraining diagenetic histories.
Buchardt Bjørn
Halliday Alex N.
Israelson Carsten
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