Monitoring of a methane-seeping pockmark by cabled benthic observatory (Patras Gulf, Greece)

Marinaro, G.; Etiope, Giuseppe; Bue, Nadia Lo; Favali, P.; Papatheodorou, George; Christodoulou, Dimitris; Furlan, F.; Gasparoni, F.; Ferentinos, G.; Masson, M.; Rolin, Jean-François

doi:10.1007/s00367-006-0040-4

Cited by 32 publications

(26 citation statements)

References 12 publications

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“…Indeed, long-term time series are of prime importance in furthering our understanding of shallow-sea hydrothermal systems. Notably, more usage should be made of existing real-time technologies such as the cabled seafloor observatory first deployed already a decade ago to monitor an actively seeping pockmark in the Gulf of Patras, Ionian Sea (Marinaro et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea

Megalovasilis

Γοδελίτσας

2015

Geo-Mar Lett

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The Kos-Nisyros volcanic centre is a long-active, Plio-Pleistocene magmatic system in the subduction zone along the easternmost edge of the active Hellenic volcanic arc in the Aegean Sea. Although today there are signs of relative quiescence in volcanic activity, active onshore fumaroles and shallow-sea hydrothermal vents persist on, amongst others, the island of Kos. The present study explores the largescale imprint of hydrothermally sourced heavy metals and nutrients on the island's coastal marine environment, based on geochemical data collected in September 2007 from hydrothermal waters and surficial nearshore sediments (<10 m water depth) at several vents in the Bros Thermi and Kephalos Bay hydrothermal fields. There were strong spatiotemporal fluctuations in gas and water flow rates at the vent sites-for example, the gas/water flux ratio varied by as much as two orders of magnitude (0.03-1.30) at Kephalos Bay vents over a 2-day measurement period on 15-16 September 2007. Confirming earlier work, hydrothermal waters had higher levels of F, Ca and Sr, and lower levels of Na, Mg and SO 4 compared with ambient seawater. Moreover, there was novel evidence of strong, widespread Zn and also Mn enhancement. Cluster and factor analyses of surficial sediment data from the Bros Thermi vents (fine (mud) fractions, <63 μm, 6N HCl dissolution) revealed distinct groups of elements such as Cu+ Pb+Zn and Mn+Mg. Spatial distribution maps showed similarities in the dispersion of Cu and Pb, and of Ca and Ba. The distribution of HCl-soluble material is the inverse mirror image of the distribution of the residual (silicate and Al-silicate) phase. These findings considerably expand on existing knowledge that the coastal zone of Kos is severely influenced by ongoing submarine hydrothermal activity, and confirm that shallow-water sediment Fe, Mn, Zn and Pb levels are substantially higher than those of other islands along the Hellenic volcanic arc, and even exceed those of some deepwater hydrothermal vents in other world regions. Evidently, there may be significant metallic sulphide deposits of hydrothermal origin at depth beneath Kos.

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Section: Discussionmentioning

confidence: 99%

Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea

Megalovasilis

Γοδελίτσας

2015

Geo-Mar Lett

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“…Leifer et al, 2004;Marinaro et al, 2006;Person et al, 2006). A problem with this type of monitoring is that it cannot take into account the subsurface deformations or consider Table 2 Physical parameters used in the Hele-Shaw sandbox and existing in natural seepage environments…”

Section: Dimensional Analysis From the Hele-shaw Sandbox Experimentsmentioning

confidence: 91%

Complex plumbing systems in the near subsurface: Geometries of authigenic carbonates from Dolgovskoy Mound (Black Sea) constrained by analogue experiments

Mazzini

Ivanov

Nermoen

et al. 2008

Marine and Petroleum Geology

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“…Such instruments are typically employed in the marine environment, in vertical casts, in horizontal profilers, or in benthic platforms (e.g., Marinaro et al 2006;Camilli and Duryea 2007;Newman et al 2008;Krabbenhoeft et al 2010;Gasperini et al 2012;Embriaco et al 2014). A review of the present technology is provided in Boulart et al (2010).…”

Section: Dissolved Gasmentioning

confidence: 99%

Detecting and Measuring Gas Seepage

Etiope

2015

Natural Gas Seepage

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This chapter provides a representative overview of current methodologies for detection of gas seepage on Earth's surface, both on land and in aquatic environments (rivers, lakes, oceans). Most of the techniques described can be utilised to discover gas seepage independent of the study objective (i.e. whether for petroleum exploration, geo-hazards, or environmental studies). Most of these techniques can also be used to measure anthropogenic gas leaks, such as fugitive emissions from petroleum production and distribution facilities. Applications to petroleum exploration, as well as related interpretative tools and limits, with references to microseepage detection, are discussed in Chap. 5.The goal of this chapter is not (and cannot be) an exhaustive manual or review for all of the currently available surface seepage prospecting methods. As outlined in the sections below, several traditional techniques have been described in review papers. Here, a synthetic and synoptic picture for several currently available methodologies is provided, including the latest techniques and capabilities offered by new generation instruments. The discussion provided here focuses on direct gas detection methods. The use of gas seepage in petroleum exploration is outlined in Chap. 5. Indirect methods, including geophysical techniques and measurements of chemical, physical, or microbiological parameters in soils, water, rocks, or vegetation, modified by the presence of hydrocarbons, are briefly illustrated. Specific references, as well as a few case histories, are provided for those interested in a deeper reading of the technical details of sensing principles and instrumentation design. The detection of oil is not the objective of this book. Gas Detection MethodsAs illustrated in Fig. 4.1, gas seepage can be detected above the ground (atmospheric measurements), in the ground (soils and well head-space), and in water bodies (shallow aquifers, springs, rivers, bogs, lakes, and seas). Several of the methodologies are visually reviewed in the tree diagram shown in Fig. 4.2.

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Monitoring of a methane-seeping pockmark by cabled benthic observatory (Patras Gulf, Greece)

Cited by 32 publications

References 12 publications

Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea

Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea

Complex plumbing systems in the near subsurface: Geometries of authigenic carbonates from Dolgovskoy Mound (Black Sea) constrained by analogue experiments

Detecting and Measuring Gas Seepage

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