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Geobiology, Geochemistry and Diagenesis of Carbonates

Diagenesis continuously alters carbonate rocks and consequently their petrophysical properties. Our research projects have thus a double focus; one to understand the diagenetic processes, and two, to relate the diagenetic alterations to the resulting rock properties. 
Modern sediments on Great Bahama Bank and elsewhere provide baseline information about the geochemical signature of “unaltered” carbonate platform sediments. Cores from the shallow subsurface along the western margin of Great Bahama Bank and in Florida document the effects of early diagenesis on porosity, velocity, and permeability in platform carbonates and grainstone shoal complexes in particular. The geochemical studies of the dolomites and limestones from deeper cores on Great Bahama Bank and the Marion Plateau are ideal to examine the influence of burial diagenesis on the petrophysical properties and to assess the fluid flow in isolated carbonate platforms. Deeply buried rocks that were later uplifted such as the Mississippian Madison Formation underwent several episodes of diagenesis from shallow to deep burial. Our current geochemical projects in this formation try to unravel these different episodes and to document the importance of each event on the reservoir quality of the formation. In addition, we test the applicability of geochemical tracers, in particular δ13C for the stratigraphic correlation of the widely spaced section in Wyoming and Idaho and to other sections around the world.

Current Projects



EXAMINING THE ROLE OF MICROBIAL CONTRIBUTION TO CEMENTATION

24.Santiago_Microbial

Project Media
     
24.Santia...bial.pdf
Media Type:Media Type
File Size:566KB

 

Investigators: Alejandra Santiago, Mara R. Diaz, G. Michael Grammer and Gregor P. Eberli

Project Objectives:

  • Determine the potential contribution of microbes to cementation processes on carbonate slopes and reefal boundstone deposits.
  • Describe and interpret sedimentary structures and textures within reefal boundstone deposits.

 



     

GEOCHEMICAL SIGNATURES OF HAMELIN POOL STROMATOLITES

23.Oehlert_Stromatolites

Project Media
     
23.Oehler...ites.pdf
Media Type:Media Type
File Size:249KB

 

Investigators: Amanda Oehlert, Erica Suosaari, Ingrid Izaguirre, Brooke Vitek, Sean Ahearn, Peter Swart and R. Pamela Reid

Project Objectives:

  • Characterize the geochemical signatures of microfabrics of Hamelin Pool stromatolites.
  • Relate stable isotope, rare earth element and trace element geochemistry of stromatolite microfabrics to formation mechanism and environmental geochemistry.

 



     

GEOCHEMICAL FACIES OF THE BAHAMAS REVISITED

18.Swart_bahamas

Project Media
     
18.Swart_...amas.pdf
Media Type:Abstract
File Size:583KB

 

Investigators: Peter K Swart, John J. G. Reijmer, Gregor P. Eberli, Sam Purkis, Greta J. Mackenzie, and Amanda M. Oehlert

Project Objectives:

  • To explore geochemical variations in the surface sediments of the Great Bahama Bank and relate these to sedimentary facies.

  • To apply this information to core material from the Bahamas and other carbonate platforms, both in the Neogene and ancient carbonates.

 

 



     

NEW APPROACHES TO CONSTRAINING THE TEMPERATURE VS. CLUMPED ISOTOPE CALIBRATION FOR DOLOMITE

19.Lu_Dolomite

Project Media
     
19.Lu_Dol...mite.pdf
Media Type:Media Type
File Size:320KB

 

Investigators: Chaojin Lu, Ardiansyah Koeshidayatullah, Deniz Atasoy, Sean T. Murray, and Peter K. Swart

Project Objectives:

  • Measure the difference between the Δ47 produced at 25 and 90oC for dolomites with different initial Δ47 values
  • Use this information to constrain the clumped isotope equation for dolomite

 



     

CLUMPED ISOTOPIC VARIATIONS IN MODERN CARBONATE SEDIMENTS

Project Media
     
20.Smith_...lump.pdf
Media Type:Media Type
File Size:92KB

 

Investigators: Megan E. Smith and Peter K. Swart

Project Objectives:

  • Determine the relationship between Δ47 and temperature for a range of different carbonate allochems.

  • Analyze a wide range of bulk carbonate sediments in order to ascertain the extent of deviation from their expected temperature of the formation.

 



     

THE ROLE OF DIAGENESIS IN THE CONTROL OF B, S, AND CLUMPED ISOTOPES: THE ROLE OF EARLY DIAGENESIS

Project Media
     
21.Moore_...esis.pdf
Media Type:Media Type
File Size:85KB

 

Investigators: Evan Moore, Sean T. Murray, and Peter K. Swart

Project Objectives:

  • To constrain the behavior of the stable isotopes of boron (11B and 10B), sulfur (32S and 34S), and clumped isotopes during marine and meteoric diagenesis. 


     

RELATIONSHIPS BETWEEN THE CARBON VALUES OF INORGANIC AND ORGANIC MATERIAL FROM THE MALDIVES, BAHAMAS AND THE NICARAGUAN RISE

Project Media
     
22.Swart_...rbon.pdf
Media Type:Media Type
File Size:78KB

 

Investigators: Peter K Swart, Amanda M. Oehlert, and Greta J. Mackenzie

Project Objectives:

  • To determine the nature of the changes in the 13C values of organic material relative to 13C values in carbonate sediments.



     
 

 

 

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