Global correlation of Upper Campanian- Maastrichtian successions using carbon-isotope stratigraphy: development of a new Maastrichtian timescale
Global correlation of Upper Campanian- Maastrichtian successions using carbon-isotope stratigraphy: development of a new Maastrichtian timescale
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DOI：
10.1127/0078-0421/2012/0016
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发表时间：
2012-04
影响因子：
2.2
通讯作者：
S. Voigt;A. Gale;C. Jung;H. Jenkyns
中科院分区：
文献类型：
--
作者：
S. Voigt;A. Gale;C. Jung;H. Jenkyns
碳同位素地层学已被证明是全球白垩纪层序对比的有力工具。在这里，我们提出了新的，高分辨率的碳同位素记录的全球边界层型部分和点（GSSP）的马斯特里赫特阶段在特尔西斯莱班斯（法国），Bottaccione和Contessa部分在Gubbio（意大利），和沿海部分在诺福克（英国）提供一个全球性的δ 13 C之间的相关性架海和海洋网站。以Gubbio δ 13 C记录为参考曲线，将新记录与北部白垩海（Trunch钻孔，诺福克，英国，北方德国，Lagerdorf-Kronsmoor-Hemmoor剖面，Stevns-1钻孔，丹麦）、热带太平洋（ODP孔1210 B，Shatsky Rise）以及南大西洋和南大洋（ODP孔525 A，ODP孔690 C）的δ 13 C地层进行了对比。全球相关性允许识别发生在显著的Campanian-Maastrichtian事件上的显著高频δ 13 C变化，即晚期Campanian-Maastrichtian事件（LCE），Campanian-Maastrichtian边界事件（CMBE），中期Maastrichtian事件（MME）和古近纪-古近纪过渡（KPgE）。碳同位素事件与地磁极性尺度重新计算使用天文40 Ar/39 Ar校准的鱼峡谷透长石。该技术允许评价地层指标化石（如菊石、浮游有孔虫和钙质超微化石）基准出现的相对时间。此外，坎帕尼-马斯特里赫特边界，如在层型在泰尔西斯定义，可以精确定位相对于碳同位素地层和地磁极性时标。坎帕尼亚-马斯特里赫特阶界线的平均年龄为72.1 ± 0.1 Ma，由三种独立的方法估算，使用鱼峡谷透长石校准和马斯特里赫特天文时标的选项2。CMBE覆盖了250万年的时间跨度，反映了全球碳循环的变化，可能与构造过程有关，而不是与冰川-地壳运动有关。δ 13 C高频变化的持续时间与长偏心率的频带相吻合，表明气候和全球碳循环变化的轨道强迫。© 2012 Gebruder Borntraeger，斯图加特，德国。
Carbon-isotope stratigraphy has proven to be a powerful tool in the global correlation of Cretaceous successions. Here we present new, high-resolution carbon-isotope records for the Global Boundary Stratotype Section and Point (GSSP) of the Maastrichtian stage at Tercis les Bains (France), the Bottaccione and Contessa sections at Gubbio (Italy), and the coastal sections at Norfolk (UK) to provide a global δ13C correlation between shelf-sea and oceanic sites. The new δ13C records are correlated with δ13C-stratigraphies of the boreal chalk sea (Trunch borehole, Norfolk, UK, Lagerdorf-Kronsmoor-Hemmoor section, northern Germany, Stevns-1 core, Denmark), the tropical Pacific (ODP Hole 1210B, Shatsky Rise) and the South Atlantic and Southern Ocean (DSDP Hole 525A, ODP Hole 690C) by using an assembled Gubbio δ13C record as a reference curve. The global correlation allows the identification of significant high-frequency δ13C variations that occur superimposed on prominent Campanian-Maastrichtian events, namely the Late Campanian Event (LCE), the Campanian-Maastrichtian Boundary Event (CMBE), the mid-Maastrichtian Event (MME), and the Cretaceous-Paleogene transition (KPgE). The carbon-isotope events are correlated with the geomagnetic polarity scale recalculated using the astronomical 40Ar/39Ar calibration of the Fish Canyon sanidine. This technique allows the evaluation of the relative timing of base occurrences of stratigraphic index fossils such as ammonites, planktonic foraminifera and calcareous nannofossils. Furthermore, the Campanian-Maastrichtian boundary, as defined in the stratotype at Tercis, can be precisely positioned relative to carbon-isotope stratigraphy and the geomagnetic polarity timescale. The average value for the age of the Campanian-Maastrichtian boundary is 72.1 ± 0.1 Ma, estimated by three independent approaches that utilize the Fish Canyon sanidine calibration and Option 2 of the Maastrichtian astronomical timescale. The CMBE covers a time span of 2.5 Myr and reflects changes in the global carbon cycle probably related to tectonic process rather than to glacio-eustasy. The duration of the high-frequency δ13C variations instead coincides with the frequency band of long eccentricity, indicative of orbital forcing of changes in climate and the global carbon cycle. © 2012 Gebruder Borntraeger, Stuttgart, Germany.