A Baltic Perspective on the Early to Early Late Ordovician δ13C and δ18O Records and Its Paleoenvironmental Significance

被引:16
作者
Edward, Oluwaseun [1 ,2 ]
Korte, Christoph [1 ]
Ullmann, Clemens, V [3 ]
Colmenar, Jorge [4 ]
Thibault, Nicolas [1 ]
Bagnoli, Gabriella [5 ]
Stouge, Svend [6 ]
Rasmussen, Christian M. O. [7 ]
机构
[1] Univ Copenhagen, Dept Geosci & Nat Resource Management, Copenhagen K, Denmark
[2] Univ Lausanne, Inst Earth Surface Dynam, Lausanne, Switzerland
[3] Univ Exeter, Camborne Sch Mines, Coll Engn Math & Phys Sci, Penryn, England
[4] Inst Geol & Minero Espana, Madrid, Spain
[5] Univ Pisa, Dept Earth Sci, Pisa, Italy
[6] Univ Copenhagen, Nat Hist Museum Denmark, Copenhagen K, Denmark
[7] Univ Copenhagen, GLOBE Inst, Copenhagen K, Denmark
关键词
Early Paleozoic; stable isotopes; paleoclimate; brachiopods; Great Ordovician Biodiversification Event (GOBE); oland; LOWER-MIDDLE ORDOVICIAN; CARBON ISOTOPIC COMPOSITION; CONODONT BIOSTRATIGRAPHY; INTRASPECIFIC VARIATIONS; CHEMICAL DIAGENESIS; MODERN BRACHIOPODS; ATMOSPHERIC CO2; EXCURSION MDICE; OXYGEN; SEA;
D O I
10.1029/2021PA004309
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The current study presents new bed-by-bed brachiopod delta C-13 and delta O-18 records from oland, Sweden, which together with previously published data from the East Baltic region, constitutes a high-resolution paired brachiopod and bulk rock carbon and oxygen isotope archive through the Lower to Upper Ordovician successions of Baltoscandia. This new data set refines the temporal control on the global Ordovician delta O-18-trend considerably, improving paleoenvironmental reconstructions through the main phase of the Great Ordovician Biodiversification Event (GOBE). The new brachiopod carbon and oxygen isotope records from oland display strong similarity with the East Baltic records, elucidating the regional consistency as well as global correlation utility of the ensuing composite Baltoscandian Lower to Middle Ordovician carbon and oxygen isotope record. The carbon isotope record from oland indicates that the widely reported Middle Ordovician carbon cycle perturbation-MDICE (Mid-Darriwilian Carbon Isotope Excursion)-is recorded in both brachiopods and bulk carbonates. The oxygen isotope record reveals a long-term Lower to Upper Ordovician trend of increasingly heavier brachiopod delta O-18 values, with a pronounced increase during the Middle Ordovician Darriwilian Stage. We interpret this trend as dominantly reflecting a paleotemperature signal indicating progressively cooler Early to Middle Ordovician climate with glacio-eustasy. Our Baltic delta O-18 values are therefore consistent with postulations that the biotic radiations during the GOBE and climatic cooling during the Darriwilian were strongly linked.
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页数:26
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