Coniacian-Campanian magnetostratigraphy of the Marambio Group: The Santonian-Campanian boundary in the Antarctic Peninsula and the complete Upper Cretaceous – Lowermost Paleogene chronostratigraphical framework for the James Ross Basin

Abstract

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Characterizing the Geomagnetic Field at High Southern Latitudes: Evidence From the Antarctic Peninsula

“…James Ross Island (JRI) has been relatively well‐studied compared to typical Antarctic localities due to the presence of nearby Argentinian, Czech, and Chilean bases, which facilitate frequent visits by scientists from these countries as well as American and British scientists. The geology of the area has been the subject of numerous studies, most of which focused on igneous petrology (e.g., Košler et al., 2009; Sykes, 1988), geochronology (compilation of ages in Smellie, 2021b), glaciology (Carrivick et al., 2012; Engel et al., 2012), sedimentology/stratigraphy (Milanese et al., 2020; Tobin et al., 2012, 2020), and paleontology (Olivero, 2012; Roberts et al., 2014). The area consists of a thick Cretaceous‐Paleogene sedimentary basin, capped by a large basaltic polygenetic shield volcano along with several smaller outlying volcanoes (Figures 1 and 2a) (Smellie et al., 2013).…”

“…These samples were collected over the course of the six-week field season in February/March 2016. In addition, >1,000 cores were taken from Cretaceous-Paleogene sediments in the JRI area in the same timeframe, which are the subject of other studies (Milanese et al, 2019(Milanese et al, , 2020Tobin et al, 2020). Igneous samples were targets of opportunity, as the Cretaceous sediments were the main focus of the expedition.…”