Journal
GEOLOGY
Volume 50, Issue 4, Pages 448-453Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G49560.1
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Funding
- Khalifa University of Science and Technology (UAE) [CIRA-2019-066]
- Australian Research Council [LP150100341, LE110100119, LE100100041, LE0882836]
- U.S. National Science Foundation [EAR 1147402]
- Simons Foundation Collaboration on the Origins of Life (New York, USA) [290361FY18]
- Curtin University (Perth, Australia)
- European Association of Organic Geochemistry (Aubiere, France)
- Australian Research Council [LE0882836, LE100100041, LE110100119, LP150100341] Funding Source: Australian Research Council
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High-resolution biomarker and compound-specific isotope distributions, coupled with the degradation of calcareous fossil remnants, reveal that intensive euxinia and decalcification driven by Central Atlantic magmatic province activity formed a two-pronged kill mechanism at the end-Triassic mass extinction.
High-resolution biomarker and compound-specific isotope distributions coupled with the degradation of calcareous fossil remnants reveal that intensive euxinia and decalcification (acidification) driven by Central Atlantic magmatic province (CAMP) activity formed a two-pronged kill mechanism at the end-Triassic mass extinction. In a newly proposed extinction interval for the basal Blue Lias Formation (Bristol Channel Basin, UK), biomarker distributions reveal an episode of persistent photic zone euxinia (PZE) that extended further upward into the surface waters. In the same interval, shelly taxa almost completely disappear. Beginning in the basal paper shales of the Blue Lias Formation, a Lilliput assemblage is preserved consisting of only rare calcitic oysters (Liostrea) and ghost fossils of decalcified aragonitic bivalves. The stressors of PZE and decalcification parsimoniously explain the extinction event and inform possible combined causes of other biotic crises linked to emplacement of large igneous provinces, notably the end-Permian mass extinction, when PZE occurred on a broad and perhaps global scale.
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