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Title: Diagenetic history of Pipe Creek Jr. Reef,
Silurian, north-central Indiana,
Author(s): Simo JA, Lehmann PJ
Source: JOURNAL OF SEDIMENTARY RESEARCH 70 (4): 937-951 Part B,
Document Type: Article
Abstract: Calcite cements in the Silurian (Ludlovian)
Pipe Creek Jr, Reef, north-central
are compositionally zoned with characteristic minor-element concentrations
and stable isotope signatures, and were precipitated in different
diagenetic environments. Superposition and crosscutting relationships
allow us to group cement zones and to relate them to the sequence
stratigraphic evolution of the reef.
Pipe Creek Jr, Reef grew in normal marine waters, with the reef top high
(greater than 50 m) above the platform floor. Flank facies are
volumetrically important and are preserved largely as limestone, in
contrast to most dolomitized Silurian reefs in the midcontinent,
Syndepositional marine cements fill primary porosity and synsedimentary
fractures and are interlayered with marine internal sediment. Now low
magnesium calcite, their isotopic compositions are similar to those of
depositional grains and cements estimated to have precipitated from
Ludlovian sea waters. Depositional porosity was reduced by 75% by the
precipitation of these syndepositional cements, which stabilized the
steeply dipping flank slope.
Postdepositional, clear calcite cements are interpreted as shallow-phreatic
and burial cements on the basis of their relationship to periods of
karstification and fracturing, Shallow-phreatic cements, with concentric
cathodoluminescent (CL) zonation, precipitated in primary pores and are
postdated by fractures and caves filled with Middle Devonian sandstone. CL
zonal boundaries are sharp, and some, near a major stratigraphic
unconformity, show evidence of dissolution. The volumetric abundance of
the individual CL zones varies in the reef, indicating a complex
superposition of waters of varying chemistry and rock-water interaction
that are probably related to relative sea level changes. This important
aspect of the reef stratigraphy is recorded only by the diagenetic
succession, because evidence of earlier sea-level changes is removed by a
major later regional unconformity.
Burial cements are the youngest diagenetic feature recognized, and they
rest conformably or unconformably over older cements. They exhibit both
concentric CL zonation acid sectoral zoning, they are ferroan to
nonferroan, and they contain thin sulfide zones along growth-band
boundaries, Their isotopic compositions do not overlap with shallow-phreatic
or marine cement values. Degraded oil postdates burial cements, and is
composed of the same sterane class as the Devonian-age Antrim Shale, the
probable source rock, This source contrasts with that of reef reservoirs
in the Michigan Basin, where Silurian strata are commonly the hydrocarbon
KeyWords Plus: ZONED
CALCITE CEMENTS; FORMATION MISSISSIPPIAN; NEW-MEXICO; CARBONATE;
GEOCHEMISTRY; STRATIGRAPHY; PETROGRAPHY; PLEISTOCENE; CLINOTHEMS;
Addresses: Simo JA (reprint author), Univ
Dept Geol & Geophys,
1215 W Dayton St,
Madison, WI 53706 USA
Dept Geol & Geophys,
ExxonMobile Explorat Co,
TX 77210 USA
Publisher: SEPM-SOC SEDIMENTARY GEOLOGY,
1731 E 71ST
STREET, TULSA, OK 74136-5108 USA
What is a Field?
A specific type of information shown in a database record. The record
above contains the Title, Author, Source, Abstract and KeyWords Plus fields, among others.
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