DOI: 10.1016/j.epsl.2018.02.017
Scopus记录号: 2-s2.0-85042915436
论文题名: Carbonate-platform response to the Toarcian Oceanic Anoxic Event in the southern hemisphere: Implications for climatic change and biotic platform demise
作者: Han Z. ; Hu X. ; Kemp D.B. ; Li J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 489 起始页码: 59
结束页码: 71
语种: 英语
英文关键词: carbon isotopes
; carbonate platform
; southern hemisphere
; storm deposits
; Tibetan Himalaya
; Toarcian Oceanic Anoxic Event
Scopus关键词: Accidents
; Deposits
; Isotopes
; Storms
; Tropics
; Uncertainty analysis
; Carbon isotopes
; Carbonate platforms
; Himalayas
; Oceanic Anoxic Event
; Southern Hemisphere
; Storm deposits
; Carbonation
; anoxic conditions
; carbonate platform
; climate variation
; paleoceanography
; paleoclimate
; paleoenvironment
; Southern Hemisphere
; Tethys
; Toarcian
; China
; Xizang
英文摘要: The Toarcian Oceanic Anoxic Event (T-OAE, ∼183 Ma) was a profound short-term environmental perturbation associated with the large-scale release of 13C-depleted carbon into the global ocean–atmosphere system, which resulted in a significant negative carbon-isotope excursion (CIE). The general lack of characteristic T-OAE records outside of the northern hemisphere means that the precise environmental effects and significance of this event are uncertain. Many biotic carbonate platforms of the northern hemisphere western Tethys drowned or shifted to non-skeletal platforms during the early Toarcian. However, southern hemisphere records of Toarcian carbonate platforms are rare, and thus the extent and significance of biotic platform demise during the T-OAE is unclear. Here we present high-resolution geochemical and sedimentological data across two Pliensbachian–Toarcian shallow-water carbonate-platform sections exposed in the Tibetan Himalaya. These sections were located paleogeographically on the open southeastern tropical Tethyan margin in the southern hemisphere. The T-OAE in the Tibetan Himalaya is marked by a negative CIE in organic matter. Our sedimentological analysis of the two sections reveals an abundance of storm deposits within the T-OAE interval, which emphasizes a close link between warming and tropical storms during the T-OAE event, in line with evidence recently provided from western Tethyan sections of the northern hemisphere. In addition, our analysis also reveals extensive biotic carbonate-platform demise by drowning or changing to non-skeletal carbonates coincident with the onset of the CIE. Taken together, our results suggest that rapid and pervasive seawater warming in response to carbon release likely played a significant role in sudden biotic carbonate platform demise, and suppression/postponement of biotic platform re-development along the whole tropical/subtropical Tethyan margin. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109963
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: State Key Laboratory of Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; School of Geosciences, University of Aberdeen, Old Aberdeen, AB24 3UE, United Kingdom
Recommended Citation:
Han Z.,Hu X.,Kemp D.B.,et al. Carbonate-platform response to the Toarcian Oceanic Anoxic Event in the southern hemisphere: Implications for climatic change and biotic platform demise[J]. Earth and Planetary Science Letters,2018-01-01,489