不整合
地质学
古生物学
化学地层学
地层学
间歇
三叶虫
生物地层学
混合岩
年代地层学
层序地层学
冰期
构造盆地
碳同位素
相
构造学
奥陶纪
同位素
物理
量子力学
作者
Frank A. Corsetti,Stanley M. Awramik,David E. Pierce,Alan J. Kaufman
标识
DOI:10.1080/00206810009465096
摘要
An integrative approach combining carbon-isotope stratigraphy, biostratigraphy, and sequence stratigraphy was used to correlate between and place tentative age constraints on previously undated Neoproterozoic-Cambrian units of the Death Valley and White-Inyo successions, southern Great Basin, United States. Two regionally correlatable disconformities have been identified in the poorly fossiliferous, pre-trilobite strata. By comparing the carbon-isotope trends in the succession to a hypothetical global reference curve, the temporal magnitude of each hiatus can be postulated. The younger hiatus approaches 30 m.y. in duration and separates strata (Hines Tongue/basal Stirling unconformity) between 580 Ma and 550 Ma. The older hiatus represents ∼10 m.y. and separates strata (Wyman-Reed and upper Johnnie unconformity) between ∼590 and 580 Ma. The unconformities may be related to global sea-level fluctuations in response to Neoproterozoic ("Snowball Earth") glacial events or tectonic activity as predicted by thermal subsidence models, and as such, may provide critical data to evaluate these global phenomena.
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