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Title: Controls on rare earth element distributions in ancient organic-rich sedimentary sequences: Role of post-depositional diagenesis of phosphorus phases

Journal Article · · Chemical Geology
ORCiD logo [1];  [1];  [2];  [3];  [4];  [5]
  1. Oregon State Univ., Corvallis, OR (United States)
  2. Bigelow Lab. for Ocean Sciences, East Boothbay, ME (United States)
  3. Univ. of Cincinnati, Cincinnati, OH (United States); China Univ. of Geosciences, Wuhan (China)
  4. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  5. National Energy Technology Lab. (NETL), Albany, OR (United States)

Here, the processes that dictate the formation and preservation of rare earth element (REE) signatures in ancient marine black shales are incompletely understood, thus potentially limiting the utility of the REEs as geochemical tracers. Here, we report on whole-rock REE analyses of six black shale formations from different ages and depositional settings, which fall within three general groupings: Group 1 is characterized by low whole-rock REE content (ΣREE) (< 250 μg/g) and middle- and heavy-REE-enriched patterns (GdN/LaN < 2, YbN/LaN < 2.5); Group 2 is characterized by low ΣREE (< 250 μg/g) but greater middle-REE-enriched patterns (GdN/LaN > 2, YbN/LaN < 3); and Group 3 is characterized by high ΣREE (> 250 μg/g) and moderately middle-REE-enriched patterns (GdN/LaN ~ 1.5–2.5, YbN/LaN ~ 1). Representative samples from these groups were selected from the Marcellus and Hushpuckney shales and subjected to a multi-step leaching procedure, to isolate four extractable P-phases (reducible, authigenic carbonate-associated, detrital apatite, organic). In Group 1 samples with low carbonate content (< 4% CaCO3), REEs were hosted mainly in the organic (50% of ΣREE) and siliciclastic fractions (37%); whereas in samples with greater carbonate content (> 25% CaCO3), REEs were hosted mainly in carbonate-associated phases (53%). In Group 2, REEs were hosted mainly in the carbonate-associated (64%) and organic fractions (30%), and in Group 3, REEs were hosted mainly in the carbonate-associated (60%), detrital apatite (23%), and siliciclastic fractions (16%). Authigenic phases include minerals such as carbonate fluorapatite and authigenic calcite that, if present, tend to dominate the whole-rock REE inventory. In the absence of carbonate, whole-rock REE content depends on the relative REE contributions of the organic and siliciclastic fractions.

Research Organization:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Albany, OR (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
1415090
OSTI ID:
1485280
Alternate ID(s):
OSTI ID: 1547092
Journal Information:
Chemical Geology, Vol. 466, Issue C; ISSN 0009-2541
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (2)

The behavior of trace elements in seawater, sedimentary pore water, and their incorporation into carbonate minerals: a review journal September 2019
Effect of maturity and mineralogy on fluid-rock reactions in the Marcellus Shale journal January 2019

Figures / Tables (9)