Special features of heat flow in transform faults of the North Atlantic and Southeast Pacific

Хуторской, М. Д.; Polyak, B. G.

doi:10.1134/s0016852117010022

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…However, only very few detailed heat flow surveys across a fracture zone or a transform fault have been made up to now (von Herzen et al, 1970;Kolandaivelu et al, 2017). Published data from Khutorskoi and Polyak (2017) from the Vema fracture zone in the equatorial North Atlantic indicate remarkably uniform and high heat flow, with values between 100 and 250 mW m −2 (coinciding with similar results by Langseth and Hobart, 1976). Rather than focussing on MTFFZs, most of the offshore data from the Global Heat Flow Database (data from 1965 to 1985; Figure 7) were collected in order to characterize the marine heat flow pattern in conjunction with plate tectonics, and hence the cooling of the oceanic lithosphere.…”

Section: Heat Flowmentioning

confidence: 99%

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Marine Transform Faults and Fracture Zones: A Joint Perspective Integrating Seismicity, Fluid Flow and Life

et al. 2019

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Marine transform faults and associated fracture zones (MTFFZs) cover vast stretches of the ocean floor, where they play a key role in plate tectonics, accommodating the lateral movement of tectonic plates and allowing connections between ridges and trenches. Together with the continental counterparts of MTFFZs, these structures also pose a risk to human societies as they can generate high magnitude earthquakes and trigger tsunamis. Historical examples are the Sumatra-Wharton Basin Earthquake in 2012 (M8.6) and the Atlantic Gloria Fault Earthquake in 1941 (M8.4). Earthquakes at MTFFZs furthermore open and sustain pathways for fluid flow triggering reactions with the host rocks that may permanently change the rheological properties of the oceanic lithosphere. In fact, they may act as conduits mediating vertical fluid flow and leading to elemental exchanges between Earth's mantle and overlying sediments. Chemicals transported upward in MTFFZs include energy substrates, such as H 2 and volatile hydrocarbons, which then sustain chemosynthetic, microbial ecosystems at and below the seafloor. Moreover, up-or downwelling of fluids within the complex system

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Section: Heat Flowmentioning

confidence: 99%

“…To date, no systemic deviations along/across MTFFZs have been observed (background map is reproduced from the GEBCO world map 2014, www.gebco.net). (Khutorskoi and Polyak, 2017), however, the original articles from which the data came from do not contain locations of these measurements.…”

Section: Heat Flowmentioning

confidence: 99%

Marine Transform Faults and Fracture Zones: A Joint Perspective Integrating Seismicity, Fluid Flow and Life

et al. 2019

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“…заливе и Красном море. На флангах трансформных разломов и близлежащих рифтовых сегментов [Khutorskoi, Polyak, 2017] величины кондуктивного теплопотока достаточно однородны -от 70 до 120 мВт/м 2 и в первом приближении зависят от возраста второго слоя океанической коры. Кондуктивный тепловой поток в активных частях трансформных разломов между фрагментами САХ адекватен полному выносу энергии в осевых зонах рифтов.…”

Section: тепловой поток вдоль аарсunclassified

Intensity Indicators of Geodynamic Processes Along the Atlantic-Arctic Rift System

Соколов

Чамов

Хуторской

et al. 2020

Geodin. tektonofiz.

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Seismicity, heat flow, seismic tomography data, prerift and synrift magmatism are considered as intensity indicators of geodynamic processes along the Atlantic-Arctic rift system (AARS). In this rift system, several large (over 100 km ) sub-latitudinal displacements of the rift axis are due to left-lateral strike-slip faulting. The AARS segments are distinguished by the age of splitting of continental plates from each other. A dependence is revealed between the current thermal state of the mantle under the AARS and the age of spreading start. This dependence is established from both seismic tomography and heat flow data. In section δ(Vp/Vs), the locations of the main segmenting faults and 'cold' anomalies in the upper mantle are coincident. Distributions of total seismic moments are practically synchronous in the depth intervals of 0-13, 13-35, and >35 km. The maximum values above the plumes are represented by higher seismic moments in the surface layer. The main demarcation zones differ in maximum energy release values in the AARS with shearing features. Comparison of these values against the age of the start of spreading processes shows trends of heat flow and medium field tomography in the AARS segments. The trends confirm the thermal interpretation of the seismic tomography data and suggest mantle cooling with age and a decrease in the mean temperatures of the mantle. The main factor causing the sublatitudinal asymmetry of heat flow in the AARS is the impact of Coriolis forces on the magma in the asthenospheric source. Most of the synrift igneous formations seem to be related to the influence of long-lived anomalies in the mantle, which had lower rates of magma generation than those typical of the formation of magmatic provinces. In conditions for spreading and the formation of the oceanic crust, the process followed the principle of energy cost minimization, and the prerift magmatic provinces with the pre-processed crust contributed to the choice and positioning of the AARS trajectory. The plume branches are imposed in the tomographic section and thus 'concealing' the relationship between the age and the thermal state. However, that does not change the trend to cooling of the mantle beneath the AARS, proportionally to the time since the start of spreading.

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A tectono-stratigraphic review of continental breakup on intraplate continental margins and its impact on resultant hydrocarbon systems

Alves

Fetter

Busby

et al. 2020

Marine and Petroleum Geology

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Special features of heat flow in transform faults of the North Atlantic and Southeast Pacific

Cited by 7 publications

References 13 publications

Marine Transform Faults and Fracture Zones: A Joint Perspective Integrating Seismicity, Fluid Flow and Life

Marine Transform Faults and Fracture Zones: A Joint Perspective Integrating Seismicity, Fluid Flow and Life

Intensity Indicators of Geodynamic Processes Along the Atlantic-Arctic Rift System

A tectono-stratigraphic review of continental breakup on intraplate continental margins and its impact on resultant hydrocarbon systems

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