Deep origin of Cenozoic volcanoes in Northeast China revealed by 3-D electrical structure

Li, Shiwen; Weng, Aihua; Li, Jianping; Shan, Xuanlong; Han, Jiangtao; Tang, Yu; Zhang, Yanhui; Wang, Xueqiu

doi:10.1007/s11430-018-9537-2

Cited by 29 publications

(32 citation statements)

References 67 publications

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“…We note that a plume produced in the regime III (X MTZ ≥ X C2 ) will be geophysically visible, but migrating melt in the regime II (X C2 ≥ X MTZ ≥ X C1 ) without substantial hydration of minerals will be hard to detect geophysically. There is evidence from seismic tomography (Tao et al 2018;Zhang et al 2018;Zhao and Ohtani 2009) and magnetotelluric (Li et al 2020) studies for plumes originated from the MTZ. Those might correspond to plumes formed under the condition of X MTZ ≥ X C2 .…”

Section: Evidence Of Wet Plumesmentioning

confidence: 99%

“…We also note that geophysical anomalies in the Appalachian (Evans et al 2019) might represent evidence for a wet plume associated with the breakup of the Pangea. In addition to geophysical observations, geochemical observations suggest the important contributions of MTZ materials to the composition of some volcanic rocks (e.g., Bonatti 1990;Kuritani et al 2013;Li et al 2020;Metrich et al 2014;Nichols et al 2002;Sobolev et al 2019). Fig.…”

Section: Evidence Of Wet Plumesmentioning

confidence: 99%

“…Seismological studies also show low-velocity regions across the MTZ suggesting partial melting in these regions (Tao et al 2018;Zhang et al 2018;Zhao and Ohtani 2009). Also, a study on electrical conductivity suggests upwelling of water-rich materials from the MTZ (e.g., Li et al 2020). However, details of how water transported by wet plumes is added to the oceans are not well known.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

“…Processes below the mantle transition zone (MTZ; a layer between~410 and 660 km depth) have been treated in a highly simplified fashion, with a few exceptions (Bercovici and Karato 2003;Karato 2012;Karato et al 2006) where the role of melting above the MTZ on global chemical circulation was emphasized. Observational evidence for deepmantle melting and water transport has been reported (e.g., Kuritani et al 2011;Li et al 2020;Liu et al 2016Liu et al , 2018Schmandt et al 2014;Tao et al 2018;Tauzin et al 2010;Yang and Faccenda 2020;Zhao and Ohtani 2009). Nakagawa et al (2015) is an important exception where they emphasized the separation of subducted oceanic crust into the MTZ.…”

Section: Introductionmentioning

confidence: 99%

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Deep mantle melting, global water circulation and its implications for the stability of the ocean mass

Karato

Karki

Park

2020

Prog Earth Planet Sci

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Oceans on Earth are present as a result of dynamic equilibrium between degassing and regassing through the interaction with Earth’s interior. We review mineral physics, geophysical, and geochemical studies related to the global water circulation and conclude that the water content has a peak in the mantle transition zone (MTZ) with a value of 0.1–1 wt% (with large regional variations). When water-rich MTZ materials are transported out of the MTZ, partial melting occurs. Vertical direction of melt migration is determined by the density contrast between the melts and coexisting minerals. Because a density change associated with a phase transformation occurs sharply for a solid but more gradually for a melt, melts formed above the phase transformation depth are generally heavier than solids, whereas melts formed below the transformation depth are lighter than solids. Consequently, hydrous melts formed either above or below the MTZ return to the MTZ, maintaining its high water content. However, the MTZ water content cannot increase without limit. The melt-solid density contrast above the 410 km depends on the temperature. In cooler regions, melting will occur only in the presence of very water-rich materials. Melts produced in these regions have high water content and hence can be buoyant above the 410 km, removing water from the MTZ. Consequently, cooler regions of melting act as a water valve to maintain the water content of the MTZ near its threshold level (~ 0.1–1.0 wt%). Mass-balance considerations explain the observed near-constant sea-level despite large fluctuations over Earth history. Observations suggesting deep-mantle melting are reviewed including the presence of low-velocity anomalies just above and below the MTZ and geochemical evidence for hydrous melts formed in the MTZ. However, the interpretation of long-term sea-level change and the role of deep mantle melting in the global water circulation are non-unique and alternative models are reviewed. Possible future directions of studies on the global water circulation are proposed including geodynamic modeling, mineral physics and observational studies, and studies integrating results from different disciplines.

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Section: Evidence Of Wet Plumesmentioning

confidence: 99%

Section: Evidence Of Wet Plumesmentioning

confidence: 99%

Section: Summary and Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deep mantle melting, global water circulation and its implications for the stability of the ocean mass

Karato

Karki

Park

2020

Prog Earth Planet Sci

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“…Since the studies by Burov & Cloetingh (2009, 2010), no new attempts have been made to investigate plume‐lithosphere interaction as the driving mechanism for subduction‐like downward movements of the continental lithosphere. This is still the case despite a growing body of robust geophysical data, including observations from seismic tomography and magneto‐telluric sounding in areas such as the Caucasus (Ismail‐Zadeh et al., 2020; Koulakov et al., 2012; Zabelina et al., 2016); Central Asia (He & Santosh, 2018); North‐East China (Kuritani et al., 2019; Li et al., 2020; Wang et al., 2018; Zhang, 2012); Iberia and its margins (Civiero et al., 2019); the Carpathians (e.g., Wortel & Spakman, 2000; Koulakov et al., 2010; Ismail‐Zadeh et al., 2012; Ádám et al., 2017; Petrescu et al., 2019), and the Colorado Plateau (Levander et al., 2011) where upwelling of hot mantle material flanked by downgoing slabs of sinking mantle lithosphere has been recently documented. This makes plume‐induced intra‐continental mantle sinking/foundering a viable and testable mechanism, deserving detailed investigation by means of both modeling and critical analysis of pertinent observations.…”

Section: Subduction Initiation: a Survey Of Mechanisms And Scenariosmentioning

confidence: 99%

Plume‐Induced Sinking of Intracontinental Lithospheric Mantle: An Overlooked Mechanism of Subduction Initiation?

Cloetingh

Koptev

Kovàcs

et al. 2021

Geochem Geophys Geosyst

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Although many different mechanisms for subduction initiation have been proposed, only few of them are viable in terms of consistency with observations and reproducibility in numerical experiments. In particular, it has recently been demonstrated that intra‐oceanic subduction triggered by an upwelling mantle plume could greatly contribute to the onset and operation of plate tectonics in the early and, to a lesser degree, modern Earth. On the contrary, the initiation of intra‐continental subduction still remains underappreciated. Here we provide an overview of 1) observational evidence for upwelling of hot mantle material flanked by downgoing proto‐slabs of sinking continental mantle lithosphere, and 2) previously published and new numerical models of plume‐induced subduction initiation. Numerical modeling shows that under the condition of a sufficiently thick (>100 km) continental plate, incipient downthrusting at the level of the lowermost lithospheric mantle can be triggered by plume anomalies of moderate temperatures and without significant strain‐ and/or melt‐related weakening of overlying rocks. This finding is in contrast with the requirements for plume‐induced subduction initiation within oceanic or thinner continental lithosphere. As a result, plume‐lithosphere interactions within continental interiors of Paleozoic‐Proterozoic‐(Archean) platforms are the least demanding (and thus potentially very common) mechanism for initiation of subduction‐like foundering in the Phanerozoic Earth. Our findings are supported by a growing body of new geophysical data collected in various intra‐continental areas. A better understanding of the role of intra‐continental mantle downthrusting and foundering in global plate tectonics and, particularly, in the initiation of “classic” ocean‐continent subduction will benefit from more detailed follow‐up investigations.

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Deep geophysical anomalies beneath the Changbaishan Volcano

Ferrand

et al. 2022

Preprint

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Subsurface imaging is key to understanding the origin of intraplate volcanos. The Changbaishan volcano, located about 2000 km away from the western Pacific subduction zone, has several debated origins. To investigate this, we compared regional seismic tomography with the electrical resistivity results and performed high-resolution 1D and quasi-2D velocity-depth profiles. We show that the upper mantle is characterized by two anomalies exhibiting distinct features which cannot be explained by the same mechanism. We document a localized low-velocity anomaly atop the 410-km discontinuity, where the P-wave velocity is reduced more than that of the S-wave (i.e., low Vp/Vs). We propose that this anomaly is caused by the reduction of the effective moduli during the phase transformation of olivine. The other anomaly, located between 300 km and 370 km depth, reveals a significant reduction of the S-wave velocity (i.e., high Vp/Vs), associated with a reduction of the electrical resistivity, altogether consistent with partial melting.

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Deep origin of Cenozoic volcanoes in Northeast China revealed by 3-D electrical structure

Cited by 29 publications

References 67 publications

Deep mantle melting, global water circulation and its implications for the stability of the ocean mass

Deep mantle melting, global water circulation and its implications for the stability of the ocean mass

Plume‐Induced Sinking of Intracontinental Lithospheric Mantle: An Overlooked Mechanism of Subduction Initiation?

Deep geophysical anomalies beneath the Changbaishan Volcano

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