Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31600.1 |
Lower Cretaceous cold snaps led to widespread glendonite occurrences in the Sverdrup Basin, Canadian High Arctic | |
Grasby, Stephen E.1,2; McCune, Gennyne E.1; Beauchamp, Benoit1; Galloway, Jennifer M.2 | |
2017-07-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Dramatic global climate change in the Early Cretaceous suggests that numerous boreal cool events perturbed otherwise warm conditions. Abundant glendonites in Valanginian and - Aptian strata are thought to be key markers of cold conditions; however, their use as climate indicators has been questioned. Therefore, a detailed study of glendonites in the context of host- rock geochemistry was conducted on Cretaceous strata exposed on Ellef Ringnes Island, Sverdrup Basin, Canadian High Arctic, to elucidate paleoenvironment controls on periodic glendonite occurrence throughout the Early Cretaceous. Two prominent glendonite zones were identified in Valanginian and Aptian strata. Data for carbon stable isotopes show d13C carb values of -29.5% to -10.5%, consistent with a carbon source from organic matter within the surrounding shale. Trace metal data suggest deposition occurred under an overall oxidizing water column in a setting with higher than average phosphorus and highly degraded organic matter. There is no variation in the geochemical parameters of the mudstones with or without glendonites. Glendonite-bearing zones are coincident, however, with regional evidence for brief periods of colder climate conditions within the otherwise warm Early Cretaceous. We conclude that while the overall conditions for glendonite formation were prevalent throughout the Cretaceous, it was the brief cold periods that provided the final range of stability for their preservation in discrete zones of Valanginian and Aptian strata. These results support the model of an overall warm Early Cretaceous climate being punctuate by several "cold snaps" of as-yet uncertain origin. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405373200001 |
WOS关键词 | CARBON-ISOTOPE EVENT ; CALCAREOUS NANNOFOSSILS ; CALCITE PSEUDOMORPHS ; NORTHERN-HEMISPHERE ; IKAITE PSEUDOMORPHS ; SEDIMENTARY-ROCKS ; PHOSPHORUS CYCLE ; HIGH-LATITUDES ; POLAR ICE ; CLIMATE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24592 |
专题 | 地球科学 |
作者单位 | 1.Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada; 2.Nat Resources Canada, Geol Survey Canada, 3303 33rd St Nw, Calgary, AB T2L 2A7, Canada |
推荐引用方式 GB/T 7714 | Grasby, Stephen E.,McCune, Gennyne E.,Beauchamp, Benoit,et al. Lower Cretaceous cold snaps led to widespread glendonite occurrences in the Sverdrup Basin, Canadian High Arctic[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Grasby, Stephen E.,McCune, Gennyne E.,Beauchamp, Benoit,&Galloway, Jennifer M..(2017).Lower Cretaceous cold snaps led to widespread glendonite occurrences in the Sverdrup Basin, Canadian High Arctic.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Grasby, Stephen E.,et al."Lower Cretaceous cold snaps led to widespread glendonite occurrences in the Sverdrup Basin, Canadian High Arctic".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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