FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4220764210> ?p ?o ?g. }

• W4220764210 abstract "Abstract The Ordovician-Silurian transition was a critical period in geological history, during which profound changes in climatic, biotic, and oceanic conditions occurred. To explore the provenance, palaeoclimate, and palaeoredox conditions in the Sichuan Basin during the Late Ordovician- early Silurian interval, we conducted a mineralogical and geochemical analysis of three formations (Wufeng, Guanyinqiao and Longmaxi formations) encountered in the Xindi No.2 well. The ternary diagram of Al 2 O 3 -(CaO*+Na 2 O)-K 2 O and the bivariate diagram of La/Th-Hf and La/Yb-∑REEs indicate that the provenance of these formations is mainly from felsic igneous rocks. The La-Th-Sc, Th-Co-Zr/10, and Th-Sc-Zr/10 ternary diagrams and two multidimensional diagrams reveal that the samples in the study area mainly originated from a collisional setting, presumably due to an active continental margin. The chemical index of alteration (CIA) values indicate that the intensity of chemical weathering in the source area was weak to moderate. The CIA values in the lower part of the Wufeng Formation and Longmaxi Formation are relatively high (67.48-73.57), indicating that the climate was warm and humid during deposition. In contrast, the CIA value declined rapidly from the upper part of the Wufeng Formation ( Metabolograptus.extraordinarius zone) to the Guanyinqiao Formation (Hirnantian stage; 58.30-64.66). During this period, the overall climate was cold and dry, but the data fluctuations show that the cold and dry climate was interrupted by a transient warm and humid climate. Palaeoredox indices (Mo concentrations and Mo EF /U EF; U/Th, V/Cr, Ni/Co, and V/V+Ni values) fluctuate during the Late Ordovician- early Silurian, which were distinguished into four distinct parts, indicating two cycles of water column euxinia. The first cycle occurred during the accumulation of the Wufeng Formation, with bottom waters evolving from oxic-suboxic (part Ⅰ) to suboxic-anoxic (part Ⅱ). Regarding the period of accumulation of the Guanyinqiao Formation (part Ⅲ), most samples show low redox-sensitive trace element concentrations, suggesting oxic-suboxic conditions. The water column transitioned from oxic to euxinic in the late Hirnantian (at the base of the Longmaxi Formation). Strong euxinic bottom water persisted throughout the deposition of the Longmaxi Formation (part Ⅳ). Finally, the δ 13 C org isotopic data constrain the timing of the Late Ordovician mass extinction and the evolution of temporal changes in the climatic and ocean redox conditions. Climatic fluctuations, coupled with oceanic anoxia, were likely responsible for the gradual end of the Late Ordovician biotic crisis." @default.
• W4220764210 created "2022-04-03" @default.
• W4220764210 creator A5033097577 @default.
• W4220764210 creator A5055921287 @default.
• W4220764210 creator A5091284037 @default.
• W4220764210 date "2022-03-09" @default.
• W4220764210 modified "2023-09-28" @default.
• W4220764210 title "Geochemical analysis of the Late Ordovician–early Silurian black shales from the Xindi No.2 well in the Upper Yangtze area, South China: Implications for provenance, palaeoclimate and palaeoenvironmental change" @default.
• W4220764210 doi "https://doi.org/10.21203/rs.3.rs-1363990/v1" @default.
• W4220764210 hasPublicationYear "2022" @default.
• W4220764210 type Work @default.
• W4220764210 citedByCount "0" @default.
• W4220764210 crossrefType "posted-content" @default.
• W4220764210 hasAuthorship W4220764210A5033097577 @default.
• W4220764210 hasAuthorship W4220764210A5055921287 @default.
• W4220764210 hasAuthorship W4220764210A5091284037 @default.
• W4220764210 hasBestOaLocation W42207642101 @default.
• W4220764210 hasConcept C121332964 @default.
• W4220764210 hasConcept C127313418 @default.
• W4220764210 hasConcept C146357865 @default.
• W4220764210 hasConcept C151730666 @default.
• W4220764210 hasConcept C167284885 @default.
• W4220764210 hasConcept C17409809 @default.
• W4220764210 hasConcept C193429443 @default.
• W4220764210 hasConcept C24890656 @default.
• W4220764210 hasConcept C2780049196 @default.
• W4220764210 hasConcept C2781291010 @default.
• W4220764210 hasConcept C91442348 @default.
• W4220764210 hasConceptScore W4220764210C121332964 @default.
• W4220764210 hasConceptScore W4220764210C127313418 @default.
• W4220764210 hasConceptScore W4220764210C146357865 @default.
• W4220764210 hasConceptScore W4220764210C151730666 @default.
• W4220764210 hasConceptScore W4220764210C167284885 @default.
• W4220764210 hasConceptScore W4220764210C17409809 @default.
• W4220764210 hasConceptScore W4220764210C193429443 @default.
• W4220764210 hasConceptScore W4220764210C24890656 @default.
• W4220764210 hasConceptScore W4220764210C2780049196 @default.
• W4220764210 hasConceptScore W4220764210C2781291010 @default.
• W4220764210 hasConceptScore W4220764210C91442348 @default.
• W4220764210 hasLocation W42207642101 @default.
• W4220764210 hasOpenAccess W4220764210 @default.
• W4220764210 hasPrimaryLocation W42207642101 @default.
• W4220764210 hasRelatedWork W1969948599 @default.
• W4220764210 hasRelatedWork W2052814231 @default.
• W4220764210 hasRelatedWork W2067421025 @default.
• W4220764210 hasRelatedWork W2071864469 @default.
• W4220764210 hasRelatedWork W2128355989 @default.
• W4220764210 hasRelatedWork W2168538422 @default.
• W4220764210 hasRelatedWork W2299099760 @default.
• W4220764210 hasRelatedWork W3100340181 @default.
• W4220764210 hasRelatedWork W4200213736 @default.
• W4220764210 hasRelatedWork W4293240674 @default.
• W4220764210 isParatext "false" @default.
• W4220764210 isRetracted "false" @default.
• W4220764210 workType "article" @default.