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40 Ar/ 39 Ar dating of ignimbrite from Inner Mongolia, northeastern China, indicates a post‐Middle Jurassic age for the overlying Daohugou Bed
Author(s) -
He H. Y.,
Wang X. L.,
Zhou Z. H.,
Zhu R. X.,
Jin F.,
Wang F.,
Ding X.,
Boven A.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl020792
Subject(s) - geology , paleontology , inner mongolia , china , vertebrate , feldspar , biology , archaeology , geography , biochemistry , quartz , gene
The 40 Ar/ 39 Ar step heating analyses of K‐feldspar derived from the ignimbrite in Inner Mongolia, China indicates that they were formed at 159.8 ± 0.8 Ma, which provides a maximum age for the overlying fossil‐bearing lacustrine deposits (Daohugou Bed). This result favors a post‐Middle Jurassic (Late Jurassic or younger), rather than the Middle Jurassic age for the Daohugou Bed. Such a result is generally consistent with vertebrate biostratigraphic evidence, providing a maximum known age for the first appearance of several major animal groups such as Cryptobranchidae of Urodela (salamanders) and Maniraptora (birds and their closest dinosaurian relatives).