气候变化领域集成服务门户(CCPortal): Integration of gamma ray spectrometry; magnetic susceptibility and calcareous nannofossils for interpreting environmental perturbations: An example from the Jenkyns Event (lower Toarcian) from South Iberian Palaeomargin (Median Subbetic; SE Spain)

CCPortal

DOI	10.1016/j.palaeo.2020.110031
	Integration of gamma ray spectrometry; magnetic susceptibility and calcareous nannofossils for interpreting environmental perturbations: An example from the Jenkyns Event (lower Toarcian) from South Iberian Palaeomargin (Median Subbetic; SE Spain)
	Reolid M.; Iwańczuk J.; Mattioli E.; Abad I.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	The Pliensbachian-Toarcian sedimentary rocks of the Median Subbetic (Betic Cordillera, SE Spain) were deposited in the South Iberian Palaeomargin under hemipelagic conditions. In the Arroyo Mingarrón section (SE Spain) these deposits are composed by a marl and marl and limestone alternation with abundant radiolarians. The application of magnetic susceptibility and gamma ray spectrometry to these deposits allows to interpret environmental changes related to the fluctuations in the continental influx of terrigenous and phytodetritus to a hemipelagic setting in the South Iberian Palaeomargin. The increase of terrigenous input was coincident with the negative carbon isotopic excursion (CIE) at the base of the NJT6 nannofossil Zone that correlates with the Jenkyns Event. The increase of Th and K content is related to enhanced detrital input, especially oxides and silicates, including clay minerals. The gamma ray signal derived from U is comparatively low with respect to K and Th. Nevertheless, the U content shows an increase in the base of NJT6 nannofossil Zone that indicates a relative increase of organic matter content coincident with the Jenkyns Event. Changes in the calcareous nannofossil assemblages at the beginning of the NJT6a nannofossil Subzone and, in particular, the sharp decrease in abundance of the species Mitrolitus jansae during the negative CIE of the Jenkyns Event are interpreted as related to sea-water stratification and a probable poor oxygenation making inhospitable the deep photic zone during this event. © 2020 Elsevier B.V.
英文关键词	Betic Cordillera; Calcareous nannofossil biostratigraphy; Lower Jurassic; Negative CIE; Petrophysical data
语种	英语
scopus关键词	clay mineral; detection method; environmental change; fossil assemblage; gamma ray spectrometry; integrated approach; magnetic susceptibility; nanofossil; photic zone; phytodetritus; radiolaria; Toarcian; Betic Cordillera; Spain; Radiolaria (protozoans)
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150293
作者单位	Departamento de Geología, Universidad de Jaén, Campus Lagunillas sn, Jaén, 23071, Spain; The Polish Geological Institute–National Research Institute, 4, Rakowiecka Street, Warsaw, 00-975, Poland; University of Lyon 1, ENSL, CNRS, LGL-TPE, Villeurbanne, F-69622, France; Institut Universitaire de France (IUF), France; Centro de Estudios Avanzados en Ciencias de la Tierra y Medio Ambiente (CEACTEMA), Spain
推荐引用方式 GB/T 7714	Reolid M.,Iwańczuk J.,Mattioli E.,et al. Integration of gamma ray spectrometry; magnetic susceptibility and calcareous nannofossils for interpreting environmental perturbations: An example from the Jenkyns Event (lower Toarcian) from South Iberian Palaeomargin (Median Subbetic; SE Spain)[J],2020,560.
APA	Reolid M.,Iwańczuk J.,Mattioli E.,&Abad I..(2020).Integration of gamma ray spectrometry; magnetic susceptibility and calcareous nannofossils for interpreting environmental perturbations: An example from the Jenkyns Event (lower Toarcian) from South Iberian Palaeomargin (Median Subbetic; SE Spain).Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Reolid M.,et al."Integration of gamma ray spectrometry; magnetic susceptibility and calcareous nannofossils for interpreting environmental perturbations: An example from the Jenkyns Event (lower Toarcian) from South Iberian Palaeomargin (Median Subbetic; SE Spain)".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).