边缘海锶同位素地层学方法的可靠性：中新世帕拉特提斯海的启示

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-10-22 DOI:10.1016/j.palaeo.2024.112566

Katarína Holcová , Filip Scheiner , Lukáš Ackerman , Rastislav Milovský , Natália Hudáčková , Šárka Hladilová , Slavomír Nehyba , Danuta Peryt

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引用次数: 0

摘要

在中新世上大陆中帕拉特提斯地区，利用对 129 个有孔虫测试和各种海洋无脊椎动物贝壳进行的 87Sr/86Sr 新结果，测试了锶同位素地层学（SIS）作为化合地层学工具的稳健性，并利用新生代开阔洋的全球 87Sr/86Sr 曲线将这些结果转换为数字年龄。将这些年龄与磁地层学、辐射测量学或生物地层学研究中的预期年龄进行了比较，这些研究适用于中帕拉特提斯不同盆地的选定剖面。不同盆地的 87Sr/86Sr 值在特定时间间隔内存在差异；因此，无法为中帕拉特提斯地区构建一条独特的 87Sr/86Sr 曲线，用于化合地层学目的。半封闭盆地中的 87Sr/86Sr 信号往往反映了源区的岩性。例如，与全球 87Sr/86Sr 信号相比，被中生代碳酸盐岩覆盖区域所包围的海洋盆地的 87Sr/86Sr 信号会减弱，这主要是由于这些中生代碳酸盐岩的排水及其特定 Sr 信号的转移。与此相反，受结晶地形大陆径流影响的地区，加上与周围海域的联系有限，87Sr/86Sr 信号高于全球 87Sr/86Sr 信号。此外，研究还表明，底栖生物、富营养化和缺氧物种（有孔虫属 Uvigerina 和软体动物）的 87Sr/86Sr 信号相对较高。因此，我们的数据表明，在半封闭海域出现了多变的 87Sr/86Sr 模式，主要反映了当地的环境，从而妨碍了可靠的 SIS 年龄。特别是，在所研究的帕拉特提斯地区，最好的 SIS 结果出现在海洋连通性最强的时期，此时可以采用其他（生物地层学）方法，而随着连通性的减弱，SIS 结果就变得不可靠了。

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Reliability of the Strontium Isotope Stratigraphy approach in marginal seas: Insights from the Miocene Paratethys

The robustness of the Strontium Isotope Stratigraphy (SIS) as a chemostratigraphic tool was tested in the Miocene epicontinental Central Paratethys using new ⁸⁷Sr/⁸⁶Sr results obtained for 129 foraminiferal tests and various marine invertebrate shells that were converted to numerical ages using the global ⁸⁷Sr/⁸⁶Sr curve for the Phanerozoic open oceans. These ages were compared with those expected from either magnetostratigraphic, radiometric or biostratigraphic studies applied to selected sections from different Central Paratethys basins. The results from different basins showed variations in ⁸⁷Sr/⁸⁶Sr values for specific time intervals; therefore, it is not possible to construct a unique ⁸⁷Sr/⁸⁶Sr curve for the Central Paratethys region that can be used for chemostratigraphic purposes. The ⁸⁷Sr/⁸⁶Sr signal in semi-enclosed basins tends to reflect the lithology of the source areas. For example, marine basins surrounded by areas of Mesozoic carbonate rock cover are associated with a reduced ⁸⁷Sr/⁸⁶Sr signal compared to the global ⁸⁷Sr/⁸⁶Sr signal primarily due to the drainage of these Mesozoic carbonate rocks and transfer of their specific Sr signal. By contrast, areas affected by continental runoff from crystalline terrains in combination with limited connection to surrounding marine domains were found to show an elevated ⁸⁷Sr/⁸⁶Sr signal compared to the global one. Additionally, it was demonstrated that infaunal, eutrophic and hypoxic species (foraminiferal genus Uvigerina and molluscs) show a shift towards a relatively higher ⁸⁷Sr/⁸⁶Sr signal. Therefore, our data show that variable ⁸⁷Sr/⁸⁶Sr patterns occur in semi-enclosed domains, primarily reflecting local settings and thus hampering reliable SIS ages. In particular, the best SIS results in the studied Paratethys area occur during periods of maximum marine connectivity, when other (biostratigraphic) methods can be applied, and then become unreliable as connectivity diminishes.

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.