Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France)
Abstract
:1. Introduction
2. Geological Background
2.1. Geological Setting
2.2. Burial History
3. Methods
3.1. Sampling and Mineralogy
Sampling Site | Sample | Latitude | Longitude | Lithology | Mean Ro (%) | SD Ro | TOC (%) |
---|---|---|---|---|---|---|---|
Allons (Al) | 1A | N 43°59′05.9″ | E 6°34′56.3″ | Marl (MBl) | |||
2A | N 44°00′09.4″ | E 6°34′11.1″ | Marl (MBl) | ||||
Rouaine (R) | 4A | N 43°56′01.1″ | E 6°40′12.9″ | Marl (MBl) | |||
5A | N 43°56′06.6″ | E 6°40′29.4″ | Fine-grained sandstone (GA) | ||||
Braux (B) | 6A | N 43°58′16″ | E 6° 42′17.2″ | Marl (MBl) | |||
7A | N 43°58′16″ | E 6°42′17.2″ | Fine-grained sandstone (GA) | ||||
Annot (A) | A0 | N 43°57′43.1″ | E 6°40′34.6″ | Marl (MBl) | |||
11A | ND | ND | Marl (MBl) | ||||
12A | ND | ND | Fine-grained sandstone (GA) | ||||
Le Ruch (RU) | RUmg | N 44°02′40.5″ | E 6°40′28.1″ | Marl (MBl) | |||
RUmb | N 44°02′40.5″ | E 6°40′28.1″ | Turbiditic pelite (MBr) | 0.54 | 0.1 | 0.23 | |
Grand Coyer (GC) | CY1p | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | 0.61 | 0.07 | 0.35 |
CY3p | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | 0.65 | 0.06 | 0.68 | |
CY5 | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | ||||
CY6 | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | ||||
CY7 | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | ||||
CY8 | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | ||||
CY10 | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | ||||
CY11 | N 44°05′09.1″ | E 6°41′0″ | Turbiditic pelite (GA) | ||||
Peyresq (P) | 20A | N 44°02′12.0″ | E 6°36′25.6″ | Marl (MBl) | |||
Colmars (Co1) | 21A | N 44°09′11.1″ | E 6°32′41.2″ | Marl (MBl) | |||
22A | N 44°09′26.2″ | E 6°32′29.1″ | Marl (MBl) | ||||
23A | N 44°09′49.3″ | E 6°31′50.7″ | Marl (MBl) | ||||
Colmars (Co2) | 25A | N 44°09′07.7″ | E 6°40′28.7″ | Marl (MBl) | |||
26A | N 44°09′26.9″ | E 6°39′19.0″ | Marl (MBl) | ||||
Villars-Colmars (VC) | 13A | ND | ND | Turbiditic pelite (GA) | |||
14A | ND | ND | Turbiditic pelite (GA) | ||||
15A | ND | ND | Fine-grained sandstone (GA) | ||||
La Moutière (MT) | MT12 | N 44°18′58″ | E 6°47′46″ | Turbiditic pelite (GA) | 4.06 | 0.16 | 0.34 |
MT17 | N 44°18′58″ | E 6°47′46″ | Turbiditic pelite (GA) | ||||
MT29 | N 44°18′58″ | E 6°47′46″ | Turbiditic pelite (GA) | 4.13 | 0.17 | 0.28 | |
MT120 | N 44°18′58″ | E 6°47′46″ | Turbiditic pelite (GA) | ||||
MTmg | N 44°18′58″ | E 6°47′46″ | Marl (MBl) | ||||
Gias Vallonetto (GV) | GV1 | N 44°21′41.7″ | E 7°03′32.4″ | Turbiditic pelite (GA) | 6.29 | 0.41 | 0.61 |
GV11 | N 44°21′41.7″ | E 7°03′32.4″ | Turbiditic pelite (GA) | 7.47 | 0.4 | 0.43 | |
GVmg | N 44°21′41.7″ | E 7°03′32.4″ | Marl (MBl) |
3.2. Analytical Methods
4. Results
4.1. General Trends
Sampling Site | Sample | χ (μSI) | RT-SIRM300 K (μAm2/kg) | LT-SIRM10 K (μAm2/kg) |
---|---|---|---|---|
Allons (Al) | 1A | 74 | 18 | 387 |
2A | 29 | 29 | 317 | |
Rouaine (R) | 4A | 54 | 18 | 314 |
5A | 28 | 29 | 148 | |
Braux (B) | 6A | 171 | 42 | 572 |
7A | 123 | 41 | 399 | |
Annot (A) | A0 | 101 | 28 | 378 |
11A | 261 | 111 | 702 | |
12A | 170 | 92 | 905 | |
Le Ruch (RU) | RUmg | 152 | 116 | 642 |
RUmb | 185 | 59 | 2,894 | |
Grand Coyer (GC) | CY1p | 201 | 32 | 1,372 |
CY3p | 220 | 37 | 5,077 | |
CY5 | 229 | 37 | 1,334 | |
CY6 | 251 | 22 | 1,534 | |
CY7 | 231 | 35 | 1,976 | |
CY8 | 229 | 51 | 4,613 | |
CY10 | 168 | 24 | 329 | |
CY11 | 133 | 45 | 353 | |
Peyresq (P) | 20A | 45 | 29 | 422 |
Colmars (Co1) | 21A | 50 | 20 | 238 |
22A | 60 | 25 | 205 | |
23A | 41 | 28 | 311 | |
Colmars (Co2) | 25A | 121 | 78 | 1,212 |
26A | 125 | 108 | 901 | |
Villars-Colmars (VC) | 13A | 194 | 27 | 783 |
14A | 128 | 72 | 981 | |
15A | 205 | 220 | 816 | |
La Moutière (MT) | MT12 | 307 | 35 | 2,249 |
MT17 | 259 | 59 | 7,148 | |
MT29 | 301 | 34 | 3,208 | |
MT120 | 198 | 39 | 3,359 | |
MTmg | 130 | 17 | 467 | |
Gias Vallonetto (GV) | GV1 | 239 | 23 | 10,265 |
GV11 | 244 | 39 | 709 | |
GVmg | 26 | 113 | 538 | |
La Moutière (MT) | MT12 | 307 | 35 | 2,249 |
MT17 | 259 | 59 | 7,148 | |
MT29 | 301 | 34 | 3,208 | |
MT120 | 198 | 39 | 3,359 | |
MTmg | 130 | 17 | 467 | |
Gias Vallonetto (GV) | GV1 | 239 | 23 | 10,265 |
GV11 | 244 | 39 | 709 | |
GVmg | 26 | 113 | 538 |
4.2. Allons, Rouaine and Annot Areas
4.3. Braux Area
4.4. Le Ruch and Grand Coyer Areas
4.5. Villars-Colmars, La Moutière and Gias Vallonetto Areas
5. Discussion
5.1. Origin of the Magnetic Assemblage
5.2. Toward a Burial Model
5.3. Analog for a Gas Shale System?
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Kars, M.; Aubourg, C.; Labaume, P.; Berquó, T.S.; Cavailhes, T. Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France). Minerals 2014, 4, 667-689. https://doi.org/10.3390/min4030667
Kars M, Aubourg C, Labaume P, Berquó TS, Cavailhes T. Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France). Minerals. 2014; 4(3):667-689. https://doi.org/10.3390/min4030667
Chicago/Turabian StyleKars, Myriam, Charles Aubourg, Pierre Labaume, Thelma S. Berquó, and Thibault Cavailhes. 2014. "Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France)" Minerals 4, no. 3: 667-689. https://doi.org/10.3390/min4030667