期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 108, 期 13, 页码 5179-5183出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1011369108
关键词
vertebrate phosphate; oxygen isotopes; paleoclimate
资金
- Chinese Academy of Sciences
- National Natural Science Foundation of China [40730208, 40502019, 40862001]
- MST (Ministry of Science and Technology) of China [2006CB806400]
- French CNRS
- Thai-French joint project (PHC) [16610UJ]
Early Cretaceous vertebrate assemblages from East Asia and particularly the Jehol Biota of northeastern China flourished during a period of highly debated climatic history. While the unique characters of these continental faunas have been the subject of various speculations about their biogeographic history, little attention has been paid to their possible climatic causes. Here we address this question using the oxygen isotope composition of apatite phosphate (delta O-18(p)) from various reptile remains recovered from China, Thailand, and Japan. delta O-18(p) values indicate that cold terrestrial climates prevailed at least in this part of Asia during the Barremian-early Albian interval. Estimated mean air temperatures of about 10 +/- 4 degrees C at midlatitudes (similar to 42 degrees N) correspond to present day cool temperate climatic conditions. Such low temperatures are in agreement with previous reports of cold marine temperatures during this part of the Early Cretaceous, as well as with the widespread occurrence of the temperate fossil wood genus Xenoxylon and the absence of thermophilic reptiles such as crocodilians in northeastern China. The unique character of the Jehol Biota is thus not only the result of its evolutionary and biogeographical history but is also due to rather cold local climatic conditions linked to the paleolatitudinal position of northeastern China and global icehouse climates that prevailed during this part of the Early Cretaceous.
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