Carbon isotopes and event stratigraphy near the Ordovician-Silurian boundary, Yichang, South China

The organic carbon isotope data through the unweathered Ordovician-Silurian boundary strata at the Wangjiawan Riverside section, which is c. 180 m southeast of the Wangjiawan North section, the GSSP for the base of the Hirnantian Stage (Upper Ordovician), show that a positive delta C-13(org) excursi...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Fan, Junxuan, Peng, Ping'an, Melchin, M. J.
Format: Report
Language:English
Published: ELSEVIER SCIENCE BV 2009
Subjects:
Carbon isotopes
Ordovician-Silurian boundary
Hirnantian
South China
Glaciation
Mass extinction
GLOBAL CORRELATION
ANTICOSTI ISLAND
YANGTZE REGION
SEA
QUEBEC
PERSPECTIVE
GRAPTOLITE
PLATFORM
Physical Geography
Geology
Paleontology
Geography
Physical
Geosciences
Multidisciplinary
South Pole
South pole
Online Access:http://ir.nigpas.ac.cn/handle/332004/19437
https://doi.org/10.1016/j.palaeo.2009.03.007
Description
Summary:The organic carbon isotope data through the unweathered Ordovician-Silurian boundary strata at the Wangjiawan Riverside section, which is c. 180 m southeast of the Wangjiawan North section, the GSSP for the base of the Hirnantian Stage (Upper Ordovician), show that a positive delta C-13(org) excursion begins just below the base of the Hirnantian Stage and peaks in the lower part of the N. extraordinarius Biozone. This is followed by an interval of slightly reduced delta C-13 values and a second peak of 2 parts per thousand above pre-Hirnantian values, which occurs in the lower part of the N. persculptus Biozone (upper Hirnantian). The peaks in delta C-13(org) values can be correlated well with episodes of glacial expansion described from Africa and peri-Gondwanan Europe. Evidence from sedimentological, faunal, and geochemical data from South China, as well as the evidence of glacial sediments in North Africa, all suggests a short-lived glaciation of similar to 1 Ma in the Ordovician South Pole region, consisting of at least two major pulses. The first phase of gradual glacial expansion began just before the Hirnantian Epoch and the second phase ended with rapid melting in the late Hirnantian (early N. persculptus Biozone). (C) 2009 Elsevier B.V. All rights reserved.

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