About This Item
Share This Item
Abstract
Journal of Sedimentary Research, Section
A: Sedimentary Petrology and Processes
Vol. 67 (1997)No.
3. (May), Pages 531-535
Assessing Mineralogical and Geochemical Heterogeneity in the Sub 63 Micron
Size Fraction of Holocene Lime Muds
Julian E. Andrews, Socrates Christidis (1), Paul F. Dennis
ABSTRACT
Silt- and clay-size material (<= 63 µm) of Holocene lime muds
from south Florida and south Australia were subdivided into five fractions
(<= 10 µm, >10-20 µm, >20-30 µm, >30-45 µm,
and >45-63 µm) by wet sieving. Carbonate mineralogy, elemental chemistry
(Mg, Sr, Fe, and Mn), and stable carbon and oxygen isotopic compositions
were determined for each size fraction. The only statistically significant
variation in carbonate mineralogy with size was enrichment in aragonite
in the south Florida <= 10 µm fraction, by up to 10% relative
to other size classes. This aragonite enrichment causes increase in Sr
concentration and increase in d13C
and d18O values (on average by up
to 1.0% and 0.8% respectively, relative to means of other size classes).
In south Florida, this very fine-grained, high Sr, isotopically enriched
aragonite probably has a calcareous algal source. Overall, within-sample
mineralogical and geochemical variation is probably not large enough to
invalidate use of the <= 63 µm fraction as a comparator for ancient
micrites. However, local and regional-scale facies variation does cause
significant change in mineralogy and geochemistry. Carbon isotope compositions,
in particular, show marked variation that might survive burial diagenetic
stabilization.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
| Protected Document: $10 |
Protected PDF Document – A Protected Document provides both the reader and the publisher with maximum security and helps guard against unauthorized users. A Protected Document is delivered as a PDF file “wrapped” in a registration file (DRM – Digital Rights Management file) that only allows the user to review and print the PDF from the machine to which it was originally downloaded. Certainly the best value and the lowest price, Protected Documents are recommended for librarians and others for whom security and copyright control is important.
|
| Internal PDF Document: $14 |
Internal Document – An Internal Document is branded with the name of the original licensed customer to discourage unauthorized users from sharing the document outside the user's organization. The PDF is no longer restricted to one machine, but can be circulated to others in the same company or department. An Internal Document also can be printed for hard copy distribution internally but is not authorized for outside distribution nor posting on the internet. Users will not be able to cut-and-paste text or images from one document to another.
|
| Open PDF Document: $24 |
Open Document – An Open Document is a fully functional PDF that can be circulated (a digital copy or hard-copy printed documents) outside the purchasing organization. Purchase of an Open Document does NOT constitute license for republication in any form, nor does it allow web posting without prior written permission from AAPG/Datapages ([email protected]).
|
GIS Map Publishing Program
