Depositional conditions and revised age of the Permo-Triassic microbialites at Gaohua section, Cili County (Hunan Province, South China)

Wang, Lina; Wignall, Paul B.; Wang, Yongbiao; Jiang, Haishui; Sun, Yongge; Li, Guoshan; Yuan, Jinling; Lai, Xulong

doi:10.1016/j.palaeo.2015.11.032

Cited by 49 publications

(43 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the largest extinction event of the Phanerozoic, the latest Permian mass extinction (LPME) at Changhsingian age and, thus, that these sections might be stratigraphically complete (i.e., without a 152 diastem at the lithologic contact at the base of the microbialite). However, recent studies have 153 identified H. parvus from close to the base of the microbialites at Dajiang and Cili, implying that the 154 8 microbialite is mostly or entirely of early Griesbachian age, and, therefore, that a diastem is present 155 at the base of the microbialite ("basal PTBM diastem") Wang et al, 2015). The 156 present study sections (Wengna and Taiping) show the same pattern (see above).…”

Section: Introductionsupporting

confidence: 58%

Environmental instability prior to end-Permian mass extinction reflected in biotic and facies changes on shallow carbonate platforms of the Nanpanjiang Basin (South China)

Tian

Tong

Xiao

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

15Shallow carbonate platforms exhibit major changes in faunal composition and facies types during 16 the latest Permian and earliest Triassic. Although the microbialites that developed following the latest 17 Permian mass extinction (LPME) have attracted wide attention, temporal variations in 18 shallow-platform facies and faunas prior to the LPME have been less thoroughly studied. Here, we 19 analyze diversity patterns and variation in skeletal composition in three Upper Permian sections from 20 isolated carbonate platforms of the Nanpanjiang Basin. In addition to the well-known transition from 21 fossil-rich Upper Permian limestones to fossil-poor Permian-Triassic boundary (PTB) microbialites, 22 2 these sections exhibit several distinct changes that predate the LPME. First, foram faunas show a 23 shift from non-fusulinid-dominated to fusulinid-dominated communities in the <1-m interval below 24 the LPME horizon of each section, reflecting a shallowing trend over ~20-30 kyr preceding the mass 25 extinction. Second, a "foram gap" and concurrent "detrital event" are observed below the LPME in 26 all three sections, recording a rapid influx of detrital siliciclastics that predated the mass extinction 27 by <60 kyr. These features reflect a degree of marine environmental instability prior to the 28 end-Permian mass extinction. The sudden influx of siliciclastics may represent an early perturbation 29 to terrestrial ecosystems linked to incipient Siberian Traps magmatism, resulting in secondary effects 30 in marine environments through increased sediment yields.31 32

show abstract

Section: Introductionsupporting

confidence: 58%

Environmental instability prior to end-Permian mass extinction reflected in biotic and facies changes on shallow carbonate platforms of the Nanpanjiang Basin (South China)

Tian

Tong

Xiao

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

show abstract

“…Contrary to this evidence, pyrite framboid size‐frequency distributions have been used to infer dysoxic water column conditions during the development of P/Tr boundary microbialites in South China (Liao et al , , ; Wang et al , ). The size‐range of pyrite framboids recorded from the Early Triassic microbialites does not, however, indicate dysoxic water column conditions as similar‐sized pyrite framboids can develop due to microbial processes within the sediment (Schieber, ) and can occur within microbialite‐forming microbial mats (Cavalazzi et al , ; Heindel et al , ).…”

Section: Discussionmentioning

confidence: 99%

Suppressed competitive exclusion enabled the proliferation of Permian/Triassic boundary microbialites

Foster

Heindel

Richoz

et al. 2019

The Depositional Record

View full text Add to dashboard Cite

During the earliest Triassic microbial mats flourished in the photic zones of marginal seas, generating widespread microbialites. It has been suggested that anoxic conditions in shallow marine environments, linked to the end-Permian mass extinction, limited mat-inhibiting metazoans allowing for this microbialite expansion.The presence of a diverse suite of proxies indicating oxygenated shallow sea-water conditions (metazoan fossils, biomarkers and redox proxies) from microbialite successions have, however, challenged the inference of anoxic conditions. Here, the distribution and faunal composition of Griesbachian microbialites from China, Iran, Turkey, Armenia, Slovenia and Hungary are investigated to determine the factors that allowed microbialite-forming microbial mats to flourish following the end-Permian crisis. The results presented here show that Neotethyan microbial buildups record a unique faunal association due to the presence of keratose sponges, while the Palaeotethyan buildups have a higher proportion of molluscs and the foraminifera Earlandia. The distribution of the faunal components within the microbial fabrics suggests that, except for the keratose sponges and some microconchids, most of the metazoans were transported into the microbial framework via wave currents. The

show abstract

“…Inferences from proxies for redox conditions were also used to infer that these microbial mats were deposited in anoxic‐dysoxic conditions, for example, pyrite framboids (Liao et al., ; Wang et al., ). Pyrite framboids, however, are not robust proxies for water column anoxia and instead are evidences for anoxic sediment or anoxic habitats in a microbial mat (Mettam et al., ).…”

Section: Discussionmentioning

confidence: 99%

Facies selectivity of benthic invertebrates in a Permian/Triassic boundary microbialite succession: Implications for the “microbialite refuge” hypothesis

Foster

Lehrmann

et al. 2019

Geobiology

View full text Add to dashboard Cite

Thrombolite and stromatolite habitats are becoming increasingly recognized as important refuges for invertebrates during Phanerozoic Oceanic Anoxic Events (OAEs); it is posited that oxygenic photosynthesis by cyanobacteria in these microbialites provided a refuge from anoxic conditions (i.e., the “microbialite refuge” hypothesis). Here, we test this hypothesis by investigating the distribution of ~34, 500 benthic invertebrate fossils found in ~100 samples from a microbialite succession that developed following the latest Permian mass extinction event on the Great Bank of Guizhou (South China), representing microbial (stromatolites and thrombolites) and non‐microbial facies. The stromatolites were the least taxonomically diverse facies, and the thrombolites also recorded significantly lower diversities when compared to the non‐microbial facies. Based on the distribution and ornamentation of the bioclasts within the thrombolites and stromatolites, the bioclasts are inferred to have been transported and concentrated in the non‐microbial fabrics, that is, cavities around the microbial framework. Therefore, many of the identified metazoans from the post‐extinction microbialites are not observed to have been living within a microbial mat. Furthermore, the lifestyle of many of the taxa identified from the microbialites was not suited for, or even amenable to, life within a benthic microbial mat. The high diversity of oxygen‐dependent metazoans in the non‐microbial facies on the Great Bank of Guizhou, and inferences from geochemical records, suggests that the microbialites and benthic communities developed in oxygenated environments, which disproves that the microbes were the source of the oxygenation. Instead, we posit that microbialite successions represent a taphonomic window for exceptional preservation of the biota, similar to a Konzentrat‐Lagerstätte, which has allowed for diverse fossil assemblages to be preserved during intervals of poor preservation.

show abstract

Depositional conditions and revised age of the Permo-Triassic microbialites at Gaohua section, Cili County (Hunan Province, South China)

Cited by 49 publications

References 39 publications

Environmental instability prior to end-Permian mass extinction reflected in biotic and facies changes on shallow carbonate platforms of the Nanpanjiang Basin (South China)

Environmental instability prior to end-Permian mass extinction reflected in biotic and facies changes on shallow carbonate platforms of the Nanpanjiang Basin (South China)

Suppressed competitive exclusion enabled the proliferation of Permian/Triassic boundary microbialites

Facies selectivity of benthic invertebrates in a Permian/Triassic boundary microbialite succession: Implications for the “microbialite refuge” hypothesis

Contact Info

Product

Resources

About