Despite the increased scientific interest in past climate deteriorations and biotic crises, the basic causes, causalities, and impacts on the environment remain controversial. The integration of high-preci-sion and accurate U-Pb zircon geochronology with litho-, bio- and chemostratigraphic records at the
<100 ka timescale can provide valuable evidence on underlying processes and feedbacks. As the chem-ical pre-treatment of zircon prior to ID-TIMS analysis appears to have a major contribution to the accu-racy of the acquired ages, the second chapter will aim to develop improved protocols for chemical pre-treatment of zircon. In the third chapter, the U-Pb ages acquired by the improved protocol will serve as basis for Bayesian age-depth models. The age-depth models will allow the temporal quantification and distinction of triggers and feedbacks that were active during the latest Smithian. On the base of precise
temporal constraints, this approach will aim to deduce and/or exclude processes, leading to the biggest intra Triassic extinction around the Smithian Spathian boundary. The fourth chapter aims to develop a composite Bayesian age-depth model of the complete Early Triassic, that is correlated to the δ13Ccarb
isotope record. This approach allows inferring durations of δ13Ccarb isotope excursions. Additionally, hafnium isotope systematics of U-Pb dated zircon from the volcanic ash beds are used to trace their origin and deduce the evolution of the magmatic and tectonic setting during the Early Triassic in the Southeast China.
1.6.1 R
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