DOI: 10.1016/j.palaeo.2016.05.012
论文题名: Jurassic carbonate microfacies and relative sea-level changes in the Tethys Himalaya (southern Tibet)
作者: Han Z. ; Hu X. ; Li J. ; Garzanti E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 456 起始页码: 1
结束页码: 20
语种: 英语
英文关键词: Carbonate microfacies
; Early Toarcian Oceanic Anoxic Event
; Jurassic
; Relative sea-level change
; Southern Tibet
; Tethys Himalaya
英文摘要: Detailed microfacies analysis of carbonate rocks from the Tingri and Nyalam areas of southern Tibet allowed us to reconstruct the evolution of sedimentary environments and relative sea-level changes during the Early to Middle Jurassic. Based on texture, sedimentary structure, grain composition, and fossil content of ~. 500 thin sections, 17 microfacies overall were identified, and three evolutionary stages of sedimentary environments were defined. Stage 1 (Rhaetian?-lower Sinemurian Zhamure Formation) is characterized by siliciclastic and mixed siliciclastic-carbonate sedimentation on a barrier island environment. Stage 2 (upper Sinemurian-Pliensbachian Pupuga Formation) is characterized by high-energy grainstones with rich benthic faunas thriving on a carbonate platform, documenting transgressions in the early and late Pliensbachian. Stage 3 (Toarcian-lower Bajocian Nieniexiongla Formation) is characterized by low-energy mudstones intercalated with frequent storm layers on a carbonate ramp, documenting the climax of the early Toarcian transgression in the beginning of the unit. The transition from Stage 1 to Stage 2 points to a paleogeographic and paleoclimatic change, as the Tibetan Tethys Himalaya moved toward tropical latitudes characterized by highly suitable climatic and ecological conditions for carbonate sedimentation. The abrupt change from Stage 2 to Stage 3 is interpreted as a consequence of the early Toarcian Oceanic Anoxic Event, accompanied by short-term warming and sea-level rise. The failed recovery from the carbonate crisis in the early Bajocian, with continuing deposition on a low-energy carbonate ramp, may reflect tectonic migration toward higher southern latitudes and/or a reduction of the effect of warm tropical currents reaching the southern Tethys. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68376
Appears in Collections: 过去全球变化的重建
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, China; Department of Earth and Environmental Sciences, Università di Milano-Bicocca, Milano, Italy
Recommended Citation:
Han Z.,Hu X.,Li J.,et al. Jurassic carbonate microfacies and relative sea-level changes in the Tethys Himalaya (southern Tibet)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,456