70 research outputs found
Agent and Broker Intermediaries in Insurance Markets - An Empirical Analysis of Market Outcomes
High‐resolution C‐isotope, TOC and biostratigraphic records of OAE 1a (Aptian) from an expanded hemipelagic cored succession, western Tethys : a new stratigraphic reference for global correlation and paleoenvironmental reconstruction
Zinc complexes of the biomimetic N,N,O ligand family of substituted 3,3-bis(1-alkylimidazol-2-yl)propionates: the formation of oxalate from pyruvate
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Late Cenozoic Dolomites of the Bahamas: Metastable Analogues for the Genesis of Ancient Platform Dolomites
The petrographic and geochemical characteristics of a more than 80 m thick sequence of shallow‐burial Late Cenozoic dolomites from Little Bahamas Bank (LBB), northern Bahamas, indicate that these dolomites are seawater‐derived and partially metastable. Dolomites range in composition between calcian and stoichiometric (Ca
.60
Mg
.40
CO
3
–Ca
.51
Mg
.49
CO
3
). Strontium content and oxygen isotopes covary with the major element composition. It is suggested that part of the 2‰ spread in oxygen isotopic composition is a result of natural and laboratory isotope fractionation. After correction for these effects oxygen isotopes are in equilibrium with seawater at 20–22°C. Iron and manganese content of the dolomites is essentially precursor‐controlled. The geometry of one of the dolomite bodies suggests that dolomitization occurred in the seawater phreatic zone. Seawater circulation through LBB was probably driven by an overlying freshwater/mixing zone system during (partial?) platform exposure.
Maturation of the metastable dolomites from LBB during future diagenesis may cause evolution of petrographic and geochemical signatures to those typical of many ancient dolomite sequences. Hence, Late Cenozoic dolomites of the Bahamas can be used as analogues for the genesis of many ancient platform dolomites. Their diagenetic potential permits the prediction of secondary diagenesis and the understanding of its impact seen in older platform dolomites
Diagenetic patterns and rock properties of the Natih Formation in a carbonate oil Field, North Oman
Isolated carbonate platforms of the Mediterranean and their seismic expression — Searching for a paradigm
Seismic stratigraphy and sedimentology of a Miocene carbonate platform in Luconia, South China Sea
Multi‐approach characterization of shallow‐water carbonates off Minamitorishima and their depositional settings/history
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