Late Paleocene event chronology: unconformities, not diachrony
Late Paleocene event chronology: unconformities, not diachrony
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古新世晚期事件年表：不整合，而非历时
DOI：
10.2113/171.3.367
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发表时间：
2000
影响因子：
--
通讯作者：
R. Olsson
中科院分区：
文献类型：
--
作者：
M. Aubry;B. S. Cramer;K. Miller;J. Wright;D. Kent;R. Olsson
AbslmCI。 - 与古新世晚期热最大值相关的事件年表（L PTM. Chron C24r）已通过构建涉及化学磁生物地层校正和假设生物源图形CI·Cl1ts的最小历时性的复合参考部分而建立。在此基础上。不同部分的相关性之间的差异是通过推断的不整合来解释的。然而。遥远的部分之间的历时性不能被 OUI 规则。我们在此报告新泽西州陆上钻探的两个地理剂量剖面，它们在代表 Chron CNr 的区间内产生了化学磁生物地层图相关性的不同记录。因为它们距离很近（相距 40 公里）。可以排除这两个剖面之间的生物地层事件的历时性。相比之下。剖面中明显的岩石学不整合很好地解释了 el·ems 的不同记录。因此，我们得出结论，Chron C24r 当前的相对年表是有坚实基础的，哈哈！上古新统-下始新统地层记录产生了多个不整合面。 NP9b 分区很少进行采样。我们研究了未破译的不整合可能对古海洋学重建代理的识别的影响，特别是关于碳等流偏移（CIE）的识别，它反映了碳循环的一次戏剧性的古新世最近的扰动。我们提出了生物地层学方法（短命的钙质微浮游生物和浮游有孔虫类群），该方法不仅可以在海洋领域而且可以在关键的海洋领域明确识别 CIE。
AbslmCI. - The chronology of the evcnts associated with the late Paleocene lhermal maximum (L PTM. Chron C24r) has been established through Ihe construclion of a composite reference sec ti on that involved chemomagnetobiostratigraphic corrclations and assumed minimum diachrony of bioslrati graphic CI·Cl1ts. On this basis. discrepancies between correlations in different sections were explained by inferred unconformities. However. diachrony between distant sections cannot be ruled OUI. We report here on two geographically dose sections drilled onshore New Jersey thaI yield different records of chemomagnetobiostratigraphk correlations in the interval represeming Chron CNr. Because of their proximity (- 40 km apart). diachrony of biostratigraphic events bel ween the two sections can be ruled out. In contrast. lhe marked lilhologic disconformities in lhe sections explain well the different records of el·ems. We thus conclude that thc cu rrent relative chronology for Chron C24r is firmly based and lha! the upper Paleocene-lower Eocene stWl igraphie record yields multiple unconformilies. with Subzone NP9b rarely sampled. We examine the implications thaI undceiphered un conformities may have on the idclllification of proxies for paleoceanographic reconslruction, in particular with regard 10 t he identification of the carbon isowpe excursion (C IE) lhat renects a dramatic lalest Paleocene disturbance of the carbon cycle. We propose biostratigraphic means (short-lived calcareous nannoplankwn and planktonic foraminifera taxa ) that permit lhe unequivocal identification of the CIE not only in the oceanic realm but al so in ncri tic sC lIins s.