Diachronous end-Permian terrestrial ecosystem collapse with its origin in wildfires
نویسندگان
چکیده
The Permian-Triassic Mass Extinction (PTME) is the greatest biodiversity crisis in Earth history and while marine increasingly well constrained, timing cause(s) of terrestrial losses remain poorly understood. There have been suggestions that End-Permian Terrestrial Collapse (EPTC) pre-dated, was synchronous with or post-dated crisis, even occurred asynchronously different regions. We address these conflicting interpretations through a detailed geochemical study sequence Liujiang Coalfield on North China Plate (NCP) which we apply zircon U-Pb dating tuffaceous claystone, kerogen identification, analysis organic carbon isotopic composition (? 13 C org ), total (TOC), continental weathering (via chemical index alteration; CIA) Ni concentrations. Our constrains boundary (PTB) near base bed 20 our at approximately 251.9 ± 1.1 Ma, immediately above anomaly also known from other sequences PTME. Organic isotope chemostratigraphy together evidence for algal blooms presence mudstone clasts suggests onset EPTC NCP low latitudes (e.g., South China), but about 310 kyr later than higher southerly Australia). predates Kerogen macerals suggest phase increased wildfire sustained until PTME interval, implicating as major driver (at least latitudes) that, turn, had devastating consequences realm. • PT radioisotopically constrained Plate. Catastrophic soil erosion marks prior to PTB. Extinctions began settings before crisis. Humid/arid conditions promoted frequent wildfires were responsible losses. End Permian led cascade effects.
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ژورنال
عنوان ژورنال: Palaeogeography, Palaeoclimatology, Palaeoecology
سال: 2022
ISSN: ['1872-616X', '0031-0182']
DOI: https://doi.org/10.1016/j.palaeo.2022.110960