|
Induction time and total reaction times, and final solid products of the hydrothermal transformation of mackinawite to pyrite a). |
|||||
| Temperature |
Induction Times (min) b) |
Reaction Time (min) |
Products (ED-XRD) |
||
|
|
|||||
| t-0 mack |
t+0 grei |
t+0 pyr |
|||
|
|
|||||
| 200°C c) |
0 |
8 |
0 |
90 |
Pyrite |
| 200°C c) |
0 |
4 |
0 |
70 |
Pyrite, Greigite |
| 175°C |
7 |
n.a.d) |
6 |
60 |
Pyrite, Greigite |
| 150°C |
4 |
6 |
12 |
74 |
Pyrite, Greigite |
| 125°C |
25 (± 3) |
n.a. |
22 |
110 |
Pyrite |
| 100°C |
77 (± 19) |
n.a. |
117 (± 30) |
311 e) |
Mackinawite, Pyrite |
|
a) All experiments: 1.25 ± 0.13 mmol FeS and 1.25 ± 0.13 mmol zerovalent S as polysulfide. b) Mean errors in induction times, unless stated otherwise: ± 1. t-0 mack: induction time for mackinawite decay; t+0 grei, t+0 pyr: induction time for greigite and pyrite growth, respectively. c) The reaction at 200°C was conducted in duplicate. d) n.a.: not available. e) Reaction was interrupted before completion. | |||||
Hunger and Benning Geochemical Transactions 2007 8:1 doi:10.1186/1467-4866-8-1 |
|||||