期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 562, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.palaeo.2020.110095
关键词
PETM; Hydrological change; Carbonate ramp; Hyperthermal event; Eastern Tethys; Active continental margin
资金
- National Natural Science Fund for Distinguished Young Scholars [41525007]
- National Natural Science Foundation of China [41888101, 41702105]
The study provides a detailed documentation of the PETM in the Xigaze forearc basin and shows the associated environmental and hydrological changes. During the PETM event, there was a notable increase in siliciclastic supply, leading to a temporary demise of the carbonate ramp.
The Paleocene-Eocene Thermal Maximum (PETM, similar to 56 Ma) was one of the major global deep-time hyperthermal events of the past. Studies of shallow-marine PETM records are crucial to understand the continental hydrological response to current global warming. This study presents the first detailed documentation of the PETM in the Xigaze forearc basin located along the northern active continental margin of the eastern Tethys Ocean, and illustrates the associated environmental and hydrological changes. Based on carbon-isotope stratigraphy, foraminiferal biostratigraphy, and zircon U-Pb chronostratigraphy, the PETM event was identified within a siliciclastic unit in the largely calcareous Jialazi Formation. Foraminiferal assemblages of Shallow Benthic Zone 4 are present below the siliciclastic unit, but are replaced by Shallow Benthic Zone 6 assemblages above the siliciclastic unit. High-resolution microfacies analysis indicates that the pre-PETM deposits consist of carbonate-ramp sediments followed by a sudden change to syn-PETM siliciclastic rocks, followed in turn by renewed post-PETM carbonate-ramp deposition. The siliciclastic supply increased notably during the PETM, as indicated by the thickness of both sandstone and shale intervals, resulting in a temporary demise of the carbonate ramp. Provenance analysis does not indicate any major change in the source areas of terrigenous detritus through the early Paleogene. Increasing siliciclastic supply is thus chiefly ascribed to the intensification of seasonal precipitation and consequently increased hydrological circulation in the Gangdese arc during the PETM event.
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