An ∼34 m.y. astronomical time scale for the uppermost Mississippian through Pennsylvanian of the Carboniferous System of the Paleo-Tethyan realm

Geology ◽  
2018 ◽  
Vol 47 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Huaichun Wu ◽  
Qiang Fang ◽  
Xiangdong Wang ◽  
Linda A. Hinnov ◽  
Yuping Qi ◽  
...  
Keyword(s):  
Time Scale ◽  
Astronomical Time

Towards a stable astronomical time scale for the Paleocene: Aligning Shatsky Rise with the Zumaia – Walvis Ridge ODP Site 1262 composite

2015 ◽  
Vol 48 (1) ◽  
pp. 91-110 ◽  
Author(s):  
Frederik J. Hilgen ◽  
Hemmo A. Abels ◽  
Klaudia F. Kuiper ◽  
Lucas J. Lourens ◽  
Mariëtte Wolthers
Keyword(s):  
Time Scale ◽  
Shatsky Rise ◽  
Walvis Ridge ◽  
Astronomical Time

scholarly journals Solar System chaos and the Paleocene–Eocene boundary age constrained by geology and astronomy

Science ◽  
2019 ◽  
Vol 365 (6456) ◽  
pp. 926-929 ◽  
Author(s):  
Richard E. Zeebe ◽  
Lucas J. Lourens
Keyword(s):  
Solar System ◽  
Time Scale ◽  
Dynamical Evolution ◽  
Resonance Transition ◽  
Fundamental Frequencies ◽  
Thermal Maximum ◽  
Astronomical Time ◽  
Geologic Data

Astronomical calculations reveal the Solar System’s dynamical evolution, including its chaoticity, and represent the backbone of cyclostratigraphy and astrochronology. An absolute, fully calibrated astronomical time scale has hitherto been hampered beyond ~50 million years before the present (Ma) because orbital calculations disagree before that age. Here, we present geologic data and a new astronomical solution (ZB18a) showing exceptional agreement from ~58 to 53 Ma. We provide a new absolute astrochronology up to 58 Ma and a new Paleocene–Eocene boundary age (56.01 ± 0.05 Ma). We show that the Paleocene–Eocene Thermal Maximum (PETM) onset occurred near a 405-thousand-year (kyr) eccentricity maximum, suggesting an orbital trigger. We also provide an independent PETM duration (170 ± 30 kyr) from onset to recovery inflection. Our astronomical solution requires a chaotic resonance transition at ~50 Ma in the Solar System’s fundamental frequencies.

scholarly journals Astronomical calibration of the geological timescale: closing the middle Eocene gap

2015 ◽  
Vol 11 (3) ◽  
pp. 1665-1699 ◽  
Author(s):  
T. Westerhold ◽  
U. Röhl ◽  
T. Frederichs ◽  
S. M. Bohaty ◽  
J. C. Zachos
Keyword(s):  
Time Scale ◽  
Middle Eocene ◽  
Age Dating ◽  
Geological Time ◽  
Geological Time Scale ◽  
Sedimentary Sequences ◽  
Climate Reconstructions ◽  
Thermal Maximum ◽  
Astronomical Time ◽  
Geological Timescale

Abstract. To explore cause and consequences in past climate reconstructions highly accuracy age models are inevitable. The highly accurate astronomical calibration of the geological time scale beyond 40 million years critically depends on the accuracy of orbital models and radio-isotopic dating techniques. Discrepancies in the age dating of sedimentary successions and the lack of suitable records spanning the middle Eocene have prevented development of a continuous astronomically calibrated geological timescale for the entire Cenozoic Era. We now solve this problem by constructing an independent astrochronological stratigraphy based on Earth's stable 405 kyr eccentricity cycle between 41 and 48 million years ago (Ma) with new data from deep-sea sedimentary sequences in the South Atlantic Ocean. This new link completes the Paleogene astronomical time scale and confirms the intercalibration of radio-isotopic and astronomical dating methods back through the Paleocene-Eocene Thermal Maximum (PETM, 55.930 Ma) and the Cretaceous/Paleogene boundary (66.022 Ma). Coupling of the Paleogene 405 kyr cyclostratigraphic frameworks across the middle Eocene further paves the way for extending the Astronomical Time Scale (ATS) into the Mesozoic.

Ice Sheets and Sea Level Change as a Response to Climatic Change at the Astronomical Time Scale

1990 ◽  
pp. 85-107 ◽  
Author(s):  
A. Berger ◽  
TH. Fichefet ◽  
H. Gallee ◽  
I. Marsiat ◽  
CH. Tricot ◽  
...  
Keyword(s):  
Climatic Change ◽  
Sea Level ◽  
Time Scale ◽  
Ice Sheets ◽  
Sea Level Change ◽  
Level Change ◽  
Astronomical Time ◽  
And Sea Level

Astronomical time scale for the lower Doushantuo Formation of early Ediacaran, South China

2018 ◽  
Vol 63 (22) ◽  
pp. 1485-1494 ◽  
Author(s):  
Yu Sui ◽  
Chunju Huang ◽  
Rui Zhang ◽  
Zhixiang Wang ◽  
James Ogg ◽  
...  
Keyword(s):  
South China ◽  
Time Scale ◽  
Doushantuo Formation ◽  
Astronomical Time

Astronomical time scale of the Paleogene lacustrine paleoclimate record from the Nanxiang Basin, central China

2019 ◽  
Vol 532 ◽  
pp. 109253 ◽  
Author(s):  
Ke Xu ◽  
Honghan Chen ◽  
Chunju Huang ◽  
James G. Ogg ◽  
Jingxiu Zhu ◽  
...  
Keyword(s):  
Time Scale ◽  
Central China ◽  
Astronomical Time
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