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• W2893383556 endingPage "32" @default.
• W2893383556 startingPage "15" @default.
• W2893383556 abstract "The Triassic–Jurassic boundary interval was characterised by the change from warm, semiarid–arid to a hot and humid climate in the Tethyan domain linked to input of greenhouse gases from the Central Atlantic Magmatic Province (CAMP) activity and Pangaea breakup. This study provides the very first outcrop evidences of palaeoclimatic evolution during the Triassic–Jurassic boundary interval in the then southern hemisphere, along the eastern margin of Gondwana facing the western Tethys. In the Tethyan Salt Range of Pakistan a succession of Upper Triassic dolomites, green-black shales (Kingriali Formation) to overlying Lower Jurassic quartzose sandstones, shales, laterites and conglomerates (Datta Formation) represents the sedimentary archives of this critical time interval. Bulk and clay mineralogy of the Upper Triassic shales indicate the presence of mainly illite while kaolinite is a minor component. The kaolinite content, a reflection of the mature stage of chemical weathering and hence hot–humid conditions, increases up-section in the overlying shales and sandstone–shale succession. The following laterite–bauxite horizons lack illite and are entirely composed of kaolinite, boehmite and haematite. The bulk rock geochemistry of the succession confirms a similar trend. The Chemical Index of Alteration (CIAmolar) displays an increasing trend from the Upper Triassic (CIA 68–80) to the overlying Lower Jurassic strata (CIA 90–97). The overall results for the succession reveal an increasing chemical maturity trend from Rhaetian to Hettangian thereby supporting a change from warm-arid to a hot and humid palaeoclimate, probably extreme greenhouse conditions. Similar changes in the clay mineralogy and sediment geochemistry across the Triassic–Jurassic boundary have been reported from basins across Europe. Thus the Salt Range provides sections from the southern hemisphere for correlations across the Triassic–Jurassic boundary." @default.
• W2893383556 created "2018-10-05" @default.
• W2893383556 creator A5004597504 @default.
• W2893383556 creator A5008097316 @default.
• W2893383556 creator A5037387669 @default.
• W2893383556 creator A5042058687 @default.
• W2893383556 creator A5068499849 @default.
• W2893383556 creator A5071561016 @default.
• W2893383556 date "2019-01-01" @default.
• W2893383556 modified "2023-09-27" @default.
• W2893383556 title "Hot-house climate during the Triassic/Jurassic transition: The evidence of climate change from the southern hemisphere (Salt Range, Pakistan)" @default.
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