Next Article in Journal
Northern Hemisphere Snow-Cover Trends (1967–2018): A Comparison between Climate Models and Observations
Next Article in Special Issue
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling
Previous Article in Journal
Modelling External Magnetic Fields of Magnetite Particles: From Micro- to Macro-Scale
Previous Article in Special Issue
Molecular and Isotopic Composition of Hydrate-Bound, Dissolved and Free Gases in the Amazon Deep-Sea Fan and Slope Sediments, Brazil
Article

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(3), 134; https://doi.org/10.3390/geosciences9030134
Received: 25 February 2019 / Revised: 14 March 2019 / Accepted: 15 March 2019 / Published: 20 March 2019
(This article belongs to the Special Issue Gas Hydrate: Environmental and Climate Impacts)
The occurrence of seep-carbonates associated with shallow gas hydrates is increasingly documented in modern continental margins but in fossil sediments the recognition of gas hydrates is still challenging for the lack of unequivocal proxies. Here, we combined multiple field and geochemical indicators for paleo-gas hydrate occurrence based on present-day analogues to investigate fossil seeps located in the northern Apennines. We recognized clathrite-like structures such as thin-layered, spongy and vuggy textures and microbreccias. Non-gravitational cementation fabrics and pinch-out terminations in cavities within the seep-carbonate deposits are ascribed to irregularly oriented dissociation of gas hydrates. Additional evidences for paleo-gas hydrates are provided by the large dimensions of seep-carbonate masses and by the association with sedimentary instability in the host sediments. We report heavy oxygen isotopic values in the examined seep-carbonates up to +6‰ that are indicative of a contribution of isotopically heavier fluids released by gas hydrate decomposition. The calculation of the stability field of methane hydrates for the northern Apennine wedge-foredeep system during the Miocene indicated the potential occurrence of shallow gas hydrates in the upper few tens of meters of sedimentary column. View Full-Text
Keywords: gas hydrates; seep-carbonates; clathrites; Miocene; northern Apennines gas hydrates; seep-carbonates; clathrites; Miocene; northern Apennines
Show Figures

Figure 1

MDPI and ACS Style

Argentino, C.; Conti, S.; Fioroni, C.; Fontana, D. Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy). Geosciences 2019, 9, 134. https://doi.org/10.3390/geosciences9030134

AMA Style

Argentino C, Conti S, Fioroni C, Fontana D. Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy). Geosciences. 2019; 9(3):134. https://doi.org/10.3390/geosciences9030134

Chicago/Turabian Style

Argentino, Claudio, Stefano Conti, Chiara Fioroni, and Daniela Fontana. 2019. "Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)" Geosciences 9, no. 3: 134. https://doi.org/10.3390/geosciences9030134

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop