scholarly journals A Late Cretaceous‐Eocene Geomagnetic Polarity Timescale (MQSD20) That Steadies Spreading Rates on Multiple Mid‐Ocean Ridge Flanks

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
A. Malinverno ◽  
K. W. Quigley ◽  
A. Staro ◽  
J. Dyment
Keyword(s):  
Late Cretaceous ◽  
Mid Ocean Ridge ◽  
Spreading Rates ◽  
Geomagnetic Polarity ◽  
Ocean Ridge

scholarly journals Global variation of seismic energy release with oceanic lithosphere age

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nicolás Pinzón ◽  
Carlos A. Vargas
Keyword(s):  
Cross Sections ◽  
Thermal Evolution ◽  
Seismic Energy ◽  
Oceanic Lithosphere ◽  
Physical Factors ◽  
Additional Tool ◽  
Mid Ocean Ridge ◽  
Mid Atlantic Ridge ◽  
Spreading Rates ◽  
Ocean Ridge

AbstractVariations in Mid Ocean Ridge seismicity with age provide a new tool to understand the thermal evolution of the oceanic lithosphere. The sum of seismic energy released by earthquakes during a time, and for an area, is proportional to its lithospheric age. Asthenospheric temperatures emerge on ridge centers with new crust resulting in high seismic activity; thus, the energy released sum is highest on the young lithosphere and decreases with age. We propose a general model that relates the systematic variation of seismic energy released with the lithospheric age. Our analysis evaluates the main physical factors involved in the changes of energy released sum with the oceanic lithosphere age in MOR systems of different spreading rates. These observations are substantiated based on three cross-sections of the East Pacific Rise, six sections in the Mid Atlantic Ridge, and three profiles in the Central Indian Ridge. Our global model provides an additional tool for understanding tectonic processes, including the effects of seismicity and mid-plate volcanism, and a better understanding of the thermal evolution for the young oceanic lithosphere.

scholarly journals Steadying Mid-Ocean Ridge Spreading Rates

Eos ◽  
2020 ◽  
Vol 101 ◽  
Author(s):  
Kate Wheeling
Keyword(s):  
Magnetic Field ◽  
Magnetic Anomaly ◽  
Data Set ◽  
Mid Ocean Ridge ◽  
History Of ◽  
Spreading Rates ◽  
Ocean Ridge

Researchers used an up-to-date global magnetic anomaly data set to track the history of magnetic field reversals and obtain more accurate estimates of tectonic spreading rates.

scholarly journals 2D reactive transport simulations of mid-ocean ridge hydrothermal systems

2019 ◽  
Vol 98 ◽  
pp. 05006
Author(s):  
Donald DePaolo ◽  
Eric Sonnenthal ◽  
Nicholas Pester
Keyword(s):  
Reactive Transport ◽  
Hydrothermal Systems ◽  
Maximum Temperature ◽  
Charge Balance ◽  
Seawater Chemistry ◽  
Fluid Chemistry ◽  
Mid Ocean Ridge ◽  
Spreading Rates ◽  
Ocean Ridge ◽  
Model Fluids

Water-rock interactions in mid-ocean ridge hydrothermal systems are a critical part of Earth system evolution. Extensive insights have been developed from vent fluid chemistry and laboratory experiments, but these leave unanswered many questions about the temporal evolution and spatial structure of the hydrothermal systems that can only be addressed with reactive transport simulations. Other issues are the effects of changing spreading rates and seawater chemistry through Earth history. We are addressing this problem using the Toughreact code, starting with 2D static (no seafloor spreading) simulations of the near-axis region where most of the interaction occurs. The simulations use a dual-permeability grid to represent fractured rocks, and also have a formulation for Sr isotope exchange. Vent fluid Ca, Mg, SO4, and Na concentrations and Sr isotopes can be used as a guide to fluid chemical evolution. Initial simulations reproduce modern vent fluid chemistry even with maximum temperature only at 380°C, and suggest that fluids need not be in equilibrium with the rocks at any point in the system. Model fluids continue to evolve chemically even in the upflow zone prior to venting. The effects of different seawater chemical composition, as proposed for the Cretaceous, for example, can be captured with charge-balance models.

scholarly journals Depth-Dependent Permeability and Heat Output at Basalt-Hosted Hydrothermal Systems Across Mid-Ocean Ridge Spreading Rates

2018 ◽  
Vol 19 (4) ◽  
pp. 1259-1281 ◽  
Author(s):  
Thibaut Barreyre ◽  
Jean-Arthur Olive ◽  
Timothy J. Crone ◽  
Robert A. Sohn
Keyword(s):  
Hydrothermal Systems ◽  
Heat Output ◽  
Mid Ocean Ridge ◽  
Spreading Rates ◽  
Ocean Ridge

Late Cretaceous charnockite with adakitic affinities from the Gangdese batholith, southeastern Tibet: Evidence for Neo-Tethyan mid-ocean ridge subduction?

2010 ◽  
Vol 17 (4) ◽  
pp. 615-631 ◽  
Author(s):  
Zeming Zhang ◽  
Guochun Zhao ◽  
M. Santosh ◽  
Jinli Wang ◽  
Xin Dong ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Ridge Subduction ◽  
Mid Ocean Ridge ◽  
Ocean Ridge ◽  
Southeastern Tibet

scholarly journals Geology of the Shelves surrounding the New Siberian Islands, Russian Arctic

2009 ◽  
Vol 4 ◽  
pp. 35-44 ◽  
Author(s):  
D. Franke ◽  
K. Hinz
Keyword(s):  
Late Cretaceous ◽  
Rift Basins ◽  
New Siberian Islands ◽  
Seismic Reflection Data ◽  
The North ◽  
Reflection Data ◽  
Mid Ocean Ridge ◽  
East Siberian Shelf ◽  
Multichannel Seismic Reflection Data ◽  
Ocean Ridge

Abstract. A total of 11 700 km of multichannel seismic reflection data were acquired during recent reconnaissance surveys of the wide, shallow shelves of the Laptev and western East Siberian Seas around the New Siberian Islands. To the north of the Laptev Sea, the Gakkel Ridge, an active mid-ocean ridge which separates the North American and Eurasian Plates, meets abruptly the steep slope of the continental shelf. Extension has affected the Laptev Shelf since at least the Early Tertiary and has resulted in the formation of three major, generally north-south trending rift basins: the Ust' Lena Rift, the Anisin Basin, and the New Siberian Basin. Our data indicate that the rift basins on the Laptev Shelf are not continuous with those on the East Siberian Shelf. The latter shelf can best be described as an epicontinental platform which has undergone continuous subsidence since the Late Cretaceous. The greatest subsidence occurred in the NE, manifested by a major depocentre filled with inferred (?)Late Cretaceous to Tertiary sediments up to 5 s (twt) thick. On the basis of deep reflection data we revise and adjust Mesozoic domain boundaries around the New Siberian Islands.

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