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Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south-west Spain
Palaeontology ( IF 2.6 ) Pub Date : 2021-04-16 , DOI: 10.1111/pala.12538
José N. Pérez‐Asensio 1
Affiliation  

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies have been used in a wide variety of geological studies on tectonic, climatic and environmental changes in sedimentary basins. However, palaeo-water-depth estimates are frequently biased due to taphonomic processes (dissolution, transport) as well as local conditions (primary productivity, oxygen content, and organic matter fluxes). This study evaluated the level of reliability of three commonly used transfer equations based on planktic and benthic foraminiferal proxies that produce different palaeobathymetric results, using Neogene sediments from the Guadalquivir Basin, south-west Spain. The most trustworthy method involves removing abundant infaunal benthic foraminifera before applying the palaeo-water-depth equation based on benthic foraminiferal water-depth ranges and presence/absence of species. This new approach provides sound palaeobathymetric results that improve estimations of long and short-term relative sea-level changes with negligible influence of taphonomic as well as ecological factors. When using one equation based on planktic/benthic ratios (P/B ratios), removing all infaunal benthic foraminiferal species improves the accuracy of P/B ratios, which yields more accurate palaeodepth reconstructions despite the low level of trustworthiness of this equation for both long and short-term relative sea-level variations.

中文翻译:

基于有孔虫代理的定量古水深重建:西班牙西南部新近纪的案例研究

基于有孔虫代表的定量古水深重建已被广泛用于沉积盆地构造、气候和环境变化的各种地质​​研究中。然而,由于埋藏过程(溶解、迁移)以及当地条件(初级生产力、氧含量和有机物质通量),古水深估计经常存在偏差。本研究使用西班牙西南部瓜达尔基维尔盆地的新近纪沉积物,评估了基于浮游和底栖有孔虫代理的三种常用转移方程的可靠性水平,这些方程产生不同的古水深测量结果。最值得信赖的方法是在应用基于底栖有孔虫水深范围和物种存在/不存在的古水深方程之前,去除丰富的底栖有孔虫。这种新方法提供了可靠的古水深测量结果,可以改善对长期和短期相对海平面变化的估计,而埋藏学和生态因素的影响可以忽略不计。当使用一个基于浮游生物/底栖生物比(P/B 比)的方程时,去除所有底栖有孔虫物种可以提高 P/B 比值的准确性,尽管该方程的可信度低和短期相对海平面变化。这种新方法提供了可靠的古水深测量结果,可以改善对长期和短期相对海平面变化的估计,而埋藏学和生态因素的影响可以忽略不计。当使用一个基于浮游生物/底栖生物比(P/B 比)的方程时,去除所有底栖有孔虫物种可以提高 P/B 比值的准确性,尽管该方程的可信度低和短期相对海平面变化。这种新方法提供了可靠的古水深测量结果,可以改善对长期和短期相对海平面变化的估计,而埋藏学和生态因素的影响可以忽略不计。当使用一个基于浮游生物/底栖生物比(P/B 比)的方程时,去除所有底栖有孔虫物种可以提高 P/B 比值的准确性,尽管该方程的可信度低和短期相对海平面变化。
更新日期:2021-06-09
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