DOI: 10.1016/j.palaeo.2020.109588
论文题名: Permian–Triassic extinction pattern revealed by foraminifers and geochemical records in the central Persian Gulf, southern Iran
作者: Haghighat N. ; Hashemi H. ; Tavakoli V. ; Nestell G.P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 310182
出版年: 2020
卷: 543 语种: 英语
英文关键词: Dorashamian
; Extinction
; Griesbachian
; Stable isotopes
; Zagros area
Scopus关键词: anoxic conditions
; dolostone
; extinction
; foraminifera
; geochemistry
; global warming
; limestone
; lithofacies
; Permian-Triassic boundary
; thrombolite
; Alps
; Arabian Sea
; Arctic
; Carnic Alps
; China
; Eastern Alps
; Greenland
; Indian Ocean
; Iran
; Jammu and Kashmir
; Persian Gulf
; Qatar
; Serbia
; Slovenia
; Turkey
; Viet Nam
; Foraminifera
英文摘要: Permian–Triassic boundary (PTB) foraminifers are studied from the upper part of the Dalan Formation and the base of the Kangan Formation in four wells (A, B, E, F) on and near the Qatar Arc, Persian Gulf, Iran. Isotope studies including δ13C and δ18O values from wells B and E and 87Sr/86Sr ratios in wells (B, E, and F) have also been carried out to possibly provide a high-resolution extinction pattern of foraminifers in the PTB interval. The latter has been thoroughly investigated in Iran, Turkey, South China, Vietnam, Slovenia, Carnic Alps and Bükk Mountains, Kashmir, Greenland, and Serbia. The distribution of the last appearance of foraminiferal genera from the PTB interval in all of the wells is very similar featuring a stepwise extinction from 3 to 2 m before the boundary and compares to that observed in some of the sections from elsewhere, i.e., South China, Vietnam, Slovenia, and Serbia. The δ13C value in wells B and E shows a negative shift at the base of a thrombolite unit immediately after the considered PTB, and another negative shift at about 11 m below it in well E. The thrombolite unit is assumed as earliest Triassic, but questionable with no supportive conodonts. The δ18O isotope values in wells B and E demonstrate the same negative upward trend due to dysoxic or anoxic conditions in the end-Permian oceans. The uniform reduction without any sharp incline in the δ18O profile suggests concurrent global warming. The highest 87Sr/86Sr ratio fluctuations in wells B, E, and F coincide with the appearance of thrombolites. Changes in the profiles of carbon, oxygen, and strontium isotopes close to the PTB in wells B, E, and F seem to correspond to lithofacies variations from limestone to dolostone and a reduction in foraminiferal diversity. These changes substantiate a clear perturbation in the marine environmental and global geochemistry elements through the PTB interval. The δ13C, δ18O and 87Sr/86Sr values obtained from the studied wells are comparable to those in other PTB stratigraphic sections in the Paleo-Tethyan region. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158520
Appears in Collections: 气候变化与战略
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作者单位: Department of Geology, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran; School of Geology, College of Science, University of Tehran, Tehran, Iran; Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, United States
Recommended Citation:
Haghighat N.,Hashemi H.,Tavakoli V.,et al. Permian–Triassic extinction pattern revealed by foraminifers and geochemical records in the central Persian Gulf, southern Iran[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2020-01-01,543