Stratigraphic control on mudrock chemistry, Kimmeridgian boulder bed succession, NE Scotland

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doi: 10.1016/S0009-2541(98)00179-X
Authors:Davies, Sarah J.; Pickering, Kevin T.
Author Affiliations:Primary:
University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
University College London, United Kingdom
Volume Title:Chemical Geology
Source:Chemical Geology, 156(1-4), p.5-23. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1999
Note:In English. Includes an appendix. 29 refs.; illus., incl. strat. col., 3 tables, sketch map
Summary:A geochemical study of the fine-grained background sediments to the Boulder Beds from the Kimmeridgian (144-136 Ma) coastal outcrops around Helmsdale, NE Scotland, show that there is a stratigraphic change in the trace and rare earth element (REE) abundances. From the oldest sediments of the Helmsdale Boulder Beds (Mutabilis Zone) to the younger (Pectinatus Zone), there is an increase in Rb and Ba with a corresponding decrease in U, V, and the REE. In the Eudoxus Zone, element abundances are generally intermediate between the Mutabilis Zone and the Pectinatus, but the samples have LaN/YbN ratios which have most in common with the Mutabilis Zone. This trend is interpreted as reflecting changing sediment input into the basin on the hanging wall of the Helmsdale Fault during the Kimmeridgian, as the footwall shelf was progressively denuded to remove initially older Jurassic and then Devonian sediments. Most of the REE characteristics are inherited from the source region with a provenance from river waters draining the hinterland. Abstract Copyright (1999) Elsevier, B.V.
Subsections:Sedimentary rocks
Subjects:Ammonoidea; Basins; Biostratigraphy; Biozones; Cephalopoda; Chemostratigraphy; Clastic rocks; Conglomerate; Controls; Depositional environment; Discriminant analysis; Faults; Geochemistry; Jurassic; Kimmeridgian; Lithogeochemistry; Major elements; Marine environment; Mesozoic; Metals; Mollusca; Mudstone; Provenance; Rare earths; Sedimentary basins; Sedimentary rocks; Shelf environment; Spectra; Statistical analysis; Trace elements; Upper Jurassic; X-ray fluorescence spectra; Caithness Scotland; Europe; Great Britain; Highland region Scotland; Scotland; United Kingdom; Western Europe; Boulder Beds; Helmsdale Scotland; Invertebrata; Tetrabranchiata
Coordinates:N575000 N584000 W0030000 W0041500
Abstract Numbers:99M/3985
Record ID:1999032012
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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