Sponge Takeover from End-Permian Mass Extinction to Early Induan Time: Records in Central Iran Microbial Buildups
نویسندگان
چکیده
The end-Permian mass extinction was the most severe biotic crisis in Earth’s history. In its direct aftermath, microbial communities were abundant on shallow-marine shelves around Tethys. They colonized space left vacant after dramatic decline of skeletal metazoans. presence sponges and sponge bioherms has largely gone unnoticed due to sponges’ size cryptic method preservation. addition dominated facies recently described South Armenia Northwestern Iran, we describe here sponge-microbial cropping out two well-known Permian-Triassic boundary localities: Kuh-e Hambast section, south-east Abadeh city more distal Shahreza near Isfahan. both sections, horizon is located at top an upper Changhsingian ammonoid-rich nodular limestone, called Paratirolites limestone. At Hambast, overlying decimetric thick shale deposit “boundary clay,” latest Permian age, conformably overlain by well-dated transgressive basal Triassic platy limestone containing four successive levels decimeter meter scale, elongated form cup-shaped mounds made branching columnar stromatolites. Sponge fibers from possibly keratose demosponge, are widely present lime mudstone matrix. above level, clay much thicker (3 m), with thin intervals, contains main scale digitate microbialite crossing similar fibers. Three rich thrombolite domes can be seen 20 m earliest age. rare spicules their micritic These which post-extinction clay, followed buildups during Griesbachian time.
منابع مشابه
Placunopsis Bioherms: the First Metazoan Buildups following the End-permian Mass Extinction
Outcrops of the Lower Triassic (Spathian) Virgin Limestone Member (Moenkopi Formation) in the southwestern United States contain the oldest known metazoan bioherms formed in the aftermath of the endPermian mass extinction. These small buildups, up to 1.0 m in diameter and 0.2 m high, were constructed by cementing bivalves. The bivalve bioherms accreted in a shallow, subtidal environment above s...
متن کاملPaleophysiology and end-Permian mass extinction
Physiological research aimed at understanding current global change provides a basis for evaluating selective survivorship associated with Permo-Triassic mass extinction. Comparative physiology links paleontological and paleoenvironmental observations, supporting the hypothesis that an end-Permian trigger, most likely Siberian Trap volcanism, touched off a set of physically-linked perturbations...
متن کاملCalibrating the end-Permian mass extinction.
The end-Permian mass extinction was the most severe biodiversity crisis in Earth history. To better constrain the timing, and ultimately the causes of this event, we collected a suite of geochronologic, isotopic, and biostratigraphic data on several well-preserved sedimentary sections in South China. High-precision U-Pb dating reveals that the extinction peak occurred just before 252.28 ± 0.08 ...
متن کاملMolecular records of microbialites following the end-Permian mass extinction in Chongyang, Hubei Province, South China
a State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, PR China b Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, PR China c Institute for the Environment, Brunel University, Kingston Lane, Uxbridge, Middlesex, UB8 3PH, United Kingdom d Research Center of...
متن کاملThe end-Permian extinction
The end Permian extinction was the greatest mass extinction of the Phanerozoic Era. It impacted marine and terrestrial plants and animals. Although the rate of the extinction has been controversial in the past, recent evidence suggests that the extinction progressed in two pulses approximately 5-12 million years apart. The second pulse of the extinction is marked by a sharp temperature spike an...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2021
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2021.586210