From: Dolomitization of the Upper Jurassic carbonate rocks in the Geneva Basin, Switzerland and France
References | Geological age | Locality | Formation | Type(s) and characteristics of dolomite(s) | Model(s)/Origin(s) of dolomitization |
---|---|---|---|---|---|
Iannace et al. (2014) | Early-Late Cretaceous | Southern Apennines, Italy | Mt. Faito and Mt. Chianello | 1. Fine (~ 50 µm) 2. Fine to medium (~ 120 µm)—subhedral to euhedral—cloudy cores and clear rims | Few pulses of reflux of only slightly concentrated marine brines |
Gomez-Rivas et al. (2014) | Early Cretaceous | Maestrat Basin, Spain | Benicassim | Fine to coarse—subhedral to anhedral—replacive fabric-retentive—cloudy | Hydrothermal dolomitization by thermal convection of concentrated seawater migrating per-ascencum from Permian–Triassic and/or Paleozoic basement, along major faults and permeable beds |
Papaioanou and Carotsieris (1993) | Jurassic-Cretaceous | Central Peloponnesus, Greece | Tripoli unit | 1. Unimodal—very fine to fine—euhedral 2. Polymodal—very-fine to fine—subhedral 3. Unimodal—medium—subhedral 4. Polymodal—medium to coarse—subhedral- void filling 5. Uni to polymodal—medium to coarse—euhedral 6. Polymodal—fine to medium—euhedral | 1. Penecontemporaneous, supratidal replacive and/or direct precipitation 2. Mechanical introduction of dolomitic sediments 3. Replacement or neomorphism of type 1 dolomite during burial 4, 5, 6. Replacive dolomitization |
Cervato (1990) | Jurassic-Cretaceous | Southern Alps, Italy | – | Fine grained to sucrosic with microamygdaloidal porosity | Hydrothermal dolomitization related to volcanic activity |
Rustichelli et al. (2017) | Late Jurassic-Early Cretaceous | Gargano Promontory, S. Italy |  | Unimodal—medium to coarse—sub-euhedral and euhedral—limpid, cloudy, sometimes cloudy cores with limpid rims—fabric destructive | Fault-related dolomitization by modified seawater during shallow burial |
Rameil ( 2008 ) | Late Jurassic-Early Cretaceous | NW Switzerland, France | Twannbach | 1. Medium—euhedral to subhedral—cloudy cores and clear rims—replacive 2. Fine—euhedral—replacive 3. Fine to medium—subhedral | 1. Reflux of dense hypersaline brines from evaporitic lagoons into the platform 2. Tidal/evaporitic pumping 3. Microbial mediation dolomitization of burrows 4. Dedolomitization during long-term emersion by meteoric waters |
Reinhold ( 1998 ) | Late Jurassic | Swabian Alb, S. Germany | Lacunosmaergel Untere Felsenkalke Obere Felsenkalke | 1. Fine to coarse—euhedral to anhedral—porphyrotopic—fabric selective to pervasive; idiotopic to xenotopic 2. Medium to very-coarse—subhedral to anhedral—pervasive; xenotopic 3. Medium to coarse—euhedral to anhedral—porphyrotopic to pervasive; idiotopic to xenotopic 4. Fine to coarse—euhedral to subhedral—void filling cement 5. Medium to coarse—anhedral—void filling, syntaxial cement 6. Fine to coarse—euhedral to anhedral—void filling cement | 1. Early dolomitization during shallow burial by modified seawater 2. Two recrystallization phases of dolomite by: interaction with modified seawater or mixed meteoric/marine water during burial and then descending meteoric waters 3. Shallow burial dolomitization leading to dolomite and ferroan dolomite cements 4. Late shallow burial saddle dolomite cementation related to deep-burial hydrothermal fluids transported along reactivated fractures |
Baldermann et al. ( 2015 ) | Late Jurassic | N. German Basin, Germany | Langenberg section | 1. Fine to medium—euhedral to subhedral 2. Fine to medium—euhedral to subhedral—hypidiotopic to idiotopic—fabric destructive—cloudy cores and clear rims 4. Coarse—euhedral—void filling cement—fabric retentive | Shallow seepage reflux and/or evaporitic tidal pumping at moderate temperatures (26 to 37 °C) by pristine marine to slightly evaporitic and reducing seawater derived interstitial solutions. Dolomitization was facilitated by bacterial sulfate reduction |
Vincent ( 2001 ) | Late Jurassic | Paris Basin, France | Callovian-Oxfordian | Fine—idiotopic—cloudy cores | Associated to pressure/dissolution features Dewatering of Callovian-Oxfordian clays rich in Mg, Fe, and Mn |