scholarly journals The clumped-isotope geochemistry of exhumed marbles from Naxos, Greece

2017 ◽  
Vol 470 ◽  
pp. 1-12 ◽  
Author(s):  
U. Ryb ◽  
M.K. Lloyd ◽  
D.A. Stolper ◽  
J.M. Eiler
Keyword(s):  
Isotope Geochemistry ◽  
Clumped Isotope

scholarly journals Burial-deformation History of Folded Rocks Unraveled by Fracture Analysis, Stylolite Paleopiezometry and Vein Cement Geochemistry: A Case Study in the Cingoli Anticline (Umbria-Marche, Northern Apennines)

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 135
Author(s):  
Aurélie Labeur ◽  
Nicolas E. Beaudoin ◽  
Olivier Lacombe ◽  
Laurent Emmanuel ◽  
Lorenzo Petracchini ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Central Italy ◽  
Microstructural Analysis ◽  
Northern Apennines ◽  
Foreland Basins ◽  
Deformation History ◽  
The North ◽  
Regional Tectonic ◽  
History Of ◽  
Clumped Isotope

Unravelling the burial-deformation history of sedimentary rocks is prerequisite information to understand the regional tectonic, sedimentary, thermal, and fluid-flow evolution of foreland basins. We use a combination of microstructural analysis, stylolites paleopiezometry, and paleofluid geochemistry to reconstruct the burial-deformation history of the Meso-Cenozoic carbonate sequence of the Cingoli Anticline (Northern Apennines, central Italy). Four major sets of mesostructures were linked to the regional deformation sequence: (i) pre-folding foreland flexure/forebulge; (ii) fold-scale layer-parallel shortening under a N045 σ1; (iii) syn-folding curvature of which the variable trend between the north and the south of the anticline is consistent with the arcuate shape of the anticline; (iv) the late stage of fold tightening. The maximum depth experienced by the strata prior to contraction, up to 1850 m, was quantified by sedimentary stylolite paleopiezometry and projected on the reconstructed burial curve to assess the timing of the contraction. As isotope geochemistry points towards fluid precipitation at thermal equilibrium, the carbonate clumped isotope thermometry (Δ47) considered for each fracture set yields the absolute timing of the development and exhumation of the Cingoli Anticline: layer-parallel shortening occurred from ~6.3 to 5.8 Ma, followed by fold growth that lasted from ~5.8 to 3.9 Ma.

scholarly journals Clumped Isotope Geochemistry of Fe-Carbonates from the Gunflint Formation

2020 ◽  
Author(s):  
Ella Holme ◽  
Gregory Henkes ◽  
Troy Rasbury ◽  
Philip Fralick ◽  
Nicholas Tosca ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Clumped Isotope

Shallow burial alteration of dolomite and limestone clumped isotope geochemistry

Geology ◽  
2016 ◽  
Vol 44 (6) ◽  
pp. 467-470 ◽  
Author(s):  
Ian Z. Winkelstern ◽  
Kyger C Lohmann
Keyword(s):  
Isotope Geochemistry ◽  
Clumped Isotope

Joint application of fluid inclusion and clumped isotope (Δ47) thermometry to burial carbonate cements from Upper Triassic reservoirs of the Paris Basin

2020 ◽  
Author(s):  
Natalia Amanda Vergara ◽  
Marta Gasparrini ◽  
Sveva Corrado ◽  
Stefano Bernasconi
Keyword(s):  
Fluid Inclusion ◽  
Isotope Geochemistry ◽  
Sedimentary Basins ◽  
Upper Triassic ◽  
Temperature History ◽  
Paris Basin ◽  
Carbonate Cements ◽  
Joint Application ◽  
Saddle Dolomite ◽  
Clumped Isotope

<p>A realistic reconstruction of the time-temperature history of sedimentary basins is critical to understand basin evolution and to predict oil maturation as well to assess reservoir quality. Carbonate rocks undergo diagenetic processes that modify their mineralogical and petrophysical properties. Understanding the temperature at which those processes occur and determining the geochemistry of the driving fluids is critical to constrain their occurrence and evolution in space and time.</p><p>Here, we put to the test the joint application of two independent techniques: the traditional fluid inclusion microthermometry (FIM) and the more recent clumped isotopes thermometer (∆<sub>47</sub>). We compare thermal information acquired by Δ<sub>47 </sub>thermometer and FIM on diagenetic carbonates having precipitated at temperatures between 60°C and 130°C in Upper Triassic reservoirs (depths of 1820-2450 m) from the well-known Paris Basin, and having suffered 120°C during maximum burial for about 20 Ma. A conventional diagenesis study (petrography, O-C isotope geochemistry) has been accomplished in samples from three different cores drilled in carbonate-cemented siliciclastic reservoir units of Norian age (<em>Grés de Chaunoy</em> Formation) and located in the northern part of the basin depocenter. A complete cement paragenesis was reconstructed highlighting three different burial cements: two non-ferroan blocky calcite phases (Cal1 and Cal2) and one non-ferroan dolomite phase of saddle type (Dol1). The progressively more negative <strong>δ</strong><sup>18</sup>O<sub>carb</sub> suggests a possible increase in temperature, going from Cal1 to Dol1, whereas the consistently negative <strong>δ</strong><sup>13</sup>C could indicate the involvement of continental fluids.</p><p>FIM indicates homogenization temperatures (Th) spanning from 60°C to 95°C (mode 67.5°C) for Cal1, 70°C to 110°C (mode 84°C) for Cal2, and 100°C to 130°C (mode 115°C) for Dol1. Δ<sub>47</sub> measurements overall reveals lower temperatures for calcite cements, indicating probable thermal re-equilibration of the fluid inclusions, and a fairly similar temperature for the saddle dolomite cement. Uncertainties in the temperatures obtained through FIM and ∆<sub>47</sub> thermometry and in the successively calculated <strong>δ</strong><sup>18</sup>O<sub>fluid</sub>, may lead to an erroneous assessment of the time of precipitation of the different diagenetic phases and to an erroneous thermal history and fluid-flow reconstruction. </p><p>This work emphasizes the necessity of better understanding the limitations and applicability fields of these thermometric tools, especially when applied to burial diagenetic phases precipitated at temperatures above 100°C and/or in reservoirs having experienced temperatures in the gas window.</p>

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