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首页> 外文期刊>Stratigraphy >Integrated stratigraphy of the La Vedova section (Conero Riviera, Italy) and implications for the Burdigalian/Langhian boundary
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Integrated stratigraphy of the La Vedova section (Conero Riviera, Italy) and implications for the Burdigalian/Langhian boundary

机译：La Vedova断面（意大利Conero Riviera，意大利）的综合地层学及其对Burdigalian / Langhian边界的影响

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摘要

We present a high resolution integrated stratigraphy (calcareous plankton biostratigraphy and magnetostratigraphy) of the upper Burdigalian to lower Langhian interval in the La Vedova section (Conero Riviera, Italy). The succession of planktonic foraminifer and calcareous nannofossil events and their relative position in the La Vedova section are comparable with those recorded in other Mediterranean sections suggesting a continuous deposition across the Burdigalian/Langhian boundary interval. The high reso-lution magnetostratigraphic record, integrated with calcareous plankton events, has been correlated to the ATNTS2004 and ranges from sub-chrons C5Cn. I n to C5Bn.2n. In addition, the integrated magnetobiostratigraphic record of the La Vedova section provides a new magnetostratigraphic calibration of calcareous plankton events, thereby improving the existing Mediterranean biochronology for the upper Burdigalian to lower Langhian. On the basis of our magnetobiostratigraphic results, the deep marine La Vedova section could be considered a suitable succession for defining the Langhian GSSP (Global Stratotype Section and Point). The recommended guiding criteria to identify the base of the Langhian stage (the Praeorbulina datum and the magnetic reversal C5Cn/C5Br) are recorded in the section. In this work the Praeorbulina datum is represented by the first occurrence of P. glomerosa curva following Blow (1956; 1969). In the La Vedova sec-tion, this bioevent postdates the Acme_a End of the planktonic foraminifer Paragloborotalia siakensis and the Paracme End of the calcar-eous nannofossil Sphenolithus heteromorphus, approximates the C5Br/C5Bn.2n reversal boundary and is dated at 15.23 Ma. The top of Chron C5Cn, dated at 15.974 Ma, is better approximated by the Last Common Occurrences of the calcareous nannofossil Helico-sphaera ampliaperta and the planktonic foraminifer Paragloborotalia bella. At La Vedova the first occurrence of P. glomerosa curva is about 740 kyrs younger than C5Cn /C5Br reversal boundary, which represents the provisional guiding criterion to define the base of the Langhian (Lourens et al. 2004). The age difference between the Praeorbulina datum and the top of C5Cn implies that the Langhian GSSP cannot be located in a position close to both Chron C5Cn and the Praeorbulina datum (Lourens et al. 2004) and that the selection of either of these guiding criteria to identify the base of the Langhian will strongly affect its duration.
机译：我们介绍了拉维多瓦部分（意大利Conero Riviera）上布尔迪加利至下朗格期段的高分辨率综合地层学（钙质浮游生物生物地层学和磁地层学）。浮游有孔虫和钙质纳米化石事件的演替及其在拉韦多瓦地区的相对位置与其他地中海地区的记录相当，表明在整个布尔迪加利安/朗吉安边界层段连续沉积。高分辨率岩层地层记录与钙质浮游生物事件相结合，已经与ATNTS2004相关，范围从次年代C5Cn。 I n为C5Bn.2n。此外，La Vedova断面的综合地磁生物地层学记录为钙质浮游生物事件提供了新的地磁地层学标定，从而改善了从上布尔迪加利到下朗厄安的现有地中海生物年代学。根据我们的磁地层学结果，深海La Vedova剖面可以被认为是确定Langhian GSSP（全球层状剖面和点）的合适演替。本节中记录了用于识别Langhian阶段基础的推荐指导标准（Praeorbulina基准面和C5Cn / C5Br磁性反转）。在这项工作中，Praororbulina基准面是Blow（1956; 1969）之后首次出现的P. glomerosa curva。在La Vedova部分中，该生物事件的发生日期是浮游有孔虫Paragloborotalia siakensis的Acme_a末端和钙质纳米化石Sphenolithus heteromorphus的Paracme末端，近似于C5Br / C5Bn.2n反转边界，日期为15.23 Ma。 Chron C5Cn的顶部日期为15.974 Ma，可以更好地近似于钙质纳米化石Helico-sphaera ampliaperta和浮游有孔虫Paragloborotalia bella的最后一次出现。在拉韦多瓦（La Vedova），首次出现的弯曲小球藻比C5Cn / C5Br反转边界年轻740 kyr，这代表了确定Langhian基底的临时指导标准（Lourens等，2004）。 Praeorbulina基准面与C5Cn顶部之间的年龄差异表明，朗吉安GSSP不能位于靠近Chron C5Cn和Praeorbulina基准面的位置（Lourens等，2004），并且选择以下两个指导标准中的一个来确定确定朗根的基础将严重影响其持续时间。

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