Geochemical Correlation In An Exhumed Submarine Channel Complex (Tabernas Basin, Se Spain): Comparison To Sedimentological Correlation At Various Length Scales

Abstract

has not yet been calibrated by testing chemostratigraphic correlations against physical 23 stratigraphic correlations from outcrop. Chemical data from a well-exposed siliciclastic 24 succession in a Tortonian (Late Miocene) submarine slope channel system in the Tabernas 25Basin of Southern Spain were generated using X-ray fluorescence supplemented by X-ray 26 diffraction, SEM analysis and light microscopy. Amongst the >60 elements measured nearly 27 a quarter of them have proved to be useful or reliable for geochemically-based correlation at 28 the tested scales (~10m, ~50m, ~100m). These elements are SiO 2 , K 2 O, Al 2 O 3 , CaO, and 29TiO 2 , as well as Zr, Nb, Th, Rb, Cs, As, and the Rare Earth Elements; La, Nd, and Ce. High 30 resolution, bed-to-bed geochemical correlation is feasible over short distances (~10m). 31Geochemical data from sections in beds that are traceable suggest that a given stratigraphic 32 level seems to be geochemically homogeneous with respect to some key elements. 33Geochemical data also provide a useful aid for high resolution sedimentary correlation, at 34 distances of several tens of meters up to at least 100m. Since each individual bed seems to be 35 broadly homogenous in composition, at a larger scale it is be possible to discern a provenance 36 signal within geochemical data. Chemical stratigraphy thus seems to work even in 37 stratigraphically-complicated submarine channel complexes. 38 39

Spatial variability in depositional reservoir quality of deep-water channel-fill and lobe deposits

“…Previous publications related to the integration of architectural-and grain-scale observations typically consider broad proximal-to-distal trends, or consider facies variability with limited spatial control (Hirst et al, 2002;Lien et al, 2006;Njoku and Pirmez, 2011;Kilhams et al, 2012;Marchand et al, 2015;Porten et al, 2016). Geochemical and mineralogical variations have been recognized within a deep-water channel complex and attributed to the primary texture (Aehnelt et al, 2013).…”

Sedimentology and Paleoenvironmental Characteristics of Fine‐grained Sediments in Coal‐bearing Strata in the Eastern Ordos Basin: A Case Study of the Exploratory Well in the Zizhou Area

“…Jones et al (1994) analyzed the chemical properties of U and Th and found that they would be deposited in finegrained sediments during deposition. Many scholars calculated δU to determine the redox condition during deposition (Alias et al, 2012;Aehnelt et al, 2013). More specifically, this effective method requires estimating the value of δU.…”

Geochemical Characteristics and Chemostratigraphic Analysis of Wufeng and Lower Longmaxi Shales, Southwest China

“…Thus, the proxies used to unveil the geochemical information of strata should be comprehensive. Currently, efforts to use easily available and high-resolution elemental proxies, including their ratios (e.g., [5,11,16,17]), have attempted to establish chemostratigraphic correlation schemes; Ratcliffe et al [5] applied inorganic whole-rock geochemical data to create a regional chemostratigraphic correlation framework of the Eagle Ford Formation. The recognition of chemozones is another integral step for chemostratigraphy.…”