Pore fluid chemistry of the North Anatolian Fault Zone in the Sea of Marmara: A diversity of sources and processes
Michael D. Tryon,Pierre Henry,M.N. Çağatay,T. Zitter,Louis Géli,Luca Gasperini,P. Burnard,Sylvain Bourlange,Céline Grall,Céline Grall +9 more
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The Marnaut cruise in the Sea of Marmara as discussed by the authors investigated the pore fluid chemistry of sites along the Main MarmARA Fault Zone and determined the sources and evolution of the fluids.Abstract:
As part of the 2007 Marnaut cruise in the Sea of Marmara, an investigation of the pore fluid chemistry of sites along the Main Marmara Fault zone was conducted. The goal was to define the spatial relationship between active faults and fluid outlets and to determine the sources and evolution of the fluids. Sites included basin bounding transtensional faults and strike-slip faults cutting through the topographic highs. The basin pore fluids are dominated by simple mixing of bottom water with a brackish, low-density Pleistocene Lake Marmara end-member that is advecting buoyantly and/or diffusing from a relatively shallow depth. This mix is overprinted by shallow redox reactions and carbonate precipitation. The ridge sites are more complex with evidence for deep-sourced fluids including thermogenic gas and evidence for both silicate and carbonate diagenetic processes. One site on the Western High displayed two mound structures that appear to be chemoherms atop a deep-seated fluid conduit. The fluids being expelled are brines of up to twice seawater salinity with an exotic fluid chemistry extremely high in Li, Sr, and Ba. Oil globules were observed both at the surface and in cores, and type II gas hydrates of thermogenic origin were recovered. Hydrate formation near the seafloor contributes to increase brine concentration but cannot explain their chemical composition, which appears to be influenced by diagenetic reactions at temperatures of 75°C–150°C. Hence, a potential source for fluids at this site is the water associated with the reservoir from which the gas and oil is seeping, which has been shown to be related to the Thrace Basin hydrocarbon system. Our work shows that submerged continental transform plate boundaries can be hydrologically active and exhibit a diversity of sources and processes.read more
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VizualAge: A Novel Approach to Laser Ablation ICP‐MS U‐Pb Geochronology Data Reduction
Joseph A. Petrus,Balz S. Kamber +1 more
TL;DR: VizualAge as discussed by the authors is a new computer software tool for analysing U-Pb data obtained by laser ablation-inductively coupled plasma-mass spectrometry.
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The configuration of Greater Gondwana—Evidence from LA ICPMS, U–Pb geochronology of detrital zircons from the Palaeozoic and Mesozoic of Southeast Asia and China
Clive Burrett,Clive Burrett,Khin Zaw,Sebastien Meffre,Chun-Kit Lai,S Khositanont,Pol Chaodumrong,Mongkol Udchachon,Samuel Ekins,Jacqueline A. Halpin +9 more
TL;DR: In this paper, detrital zircons from samples of Palaeozoic to Mesozoic sedimentary rocks have been collected in Malaysia, Thailand, Laos, Vietnam, Cambodia and China, dated by the LA ICPMS, U-Pb technique and assigned to tectonic terrans or regions within terranes.
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Algal evolution in relation to atmospheric CO2: carboxylases, carbon-concentrating mechanisms and carbon oxidation cycles
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Marine cold seeps and their manifestations: geological control, biogeochemical criteria and environmental conditions
Erwin Suess,Erwin Suess +1 more
TL;DR: A review of cold seeps at different geologic settings is presented in this article, primarily based on results of the Research Consortium SFB 574, which is drawn from examples on the erosive convergent margin off Costa Rica, the accretionary margin off Chile supplemented by examples from the transform margin of the Golf of Cadiz and the convergent Hikurangi margin off New Zealand.
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Uranium isotopes distinguish two geochemically distinct stages during the later Cambrian SPICE event.
Tais W. Dahl,Richard Boyle,Donald E. Canfield,James N. Connelly,Benjamin C. Gill,Timothy M. Lenton,Martin Bizzarro +6 more
TL;DR: High-precision uranium isotopic data in marine carbonates deposited during the Late Cambrian 'SPICE' event is reported, documenting a well-defined -0.18‰ negative δ238U excursion that occurs at the onset of the SPICE event's positive δ13C and δ34S excursions, but peaks (and tails off) before them.
References
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