Origin of Melting Anomalies in the Japan-Baikal Corridor of Asia at the Latest Geodynamic Stage: Evolution From the Mantle Transition Layer and Generation by Lithospheric Transtension

Chuvashova, Irina; Рассказов, С. В.; Sun, Yimin; Yang, Chen

doi:10.5800/gt-2017-8-3-0256

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Кроме силового поля геодинамического коридора, на Азию воздействовало также другое силовое поле, обусловленное ее конвергентным взаимодействием с Индостаном. Конвергенция отразилась в развитии литосферных структур юго-юго-западного фланга геодинамического коридора и не оказала заметного влияния на развитие структуры литосферы северо-северо-восточного фланга [Chuvashova et al, 2017b].…”

Section: Introductionunclassified

General Pb‐isotope Systematics of Sources for Volcanic Rocks of the Latest Geodynamic Stage in Asia

Рассказов

Chuvashova

Ясныгина

et al. 2019

Geodin. tektonofiz.

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The modern theory of the evolving Earth is based on integrated isotopic data obtained for the accessible part of the planet and cosmic bodies, in which the U–Pb isotope system plays a key role. The theory is tested by the isotope systematics of oceanic basalt sources. The origin of continental volcanic rocks is often interpreted in terms of the isotopic systematics of oceanic basalts. However, such interpretations, as a rule, reveal contradictions arising from differences in the history and current mantle dynamics of oceans and continents. Under the oceans, a mantle material has long lost connection with the accessible Earth tectonic units; under the continents such a connection is often established. The nature of the evolution of deep‐seated processes under the continents remains uncertain and, by analogy with the oceans, requires deciphering in terms of the components of the mantle sources for volcanic rocks. In modern lithospheric plates of the Earth, there are regions ranging in width from hundreds to thousands of kilometers, which are characterized by high strain rates and, consequently, at least one to two orders of magnitude lower viscosity relative to that of the internal stable parts of the plates. This gives them a special structural status of “dispersed plate boundaries”. The isotope‐geochemical studies of volcanic rocks from regions of the unstable Asia revealed the different nature of components in sources, for which particular interpretations have been proposed. In this paper, a general systematics of sources is defined for volcanic rocks of the latest geodynamic stage in Asia through estimating the incubation time on the 207Pb/204Pb versus 206Pb/204Pb diagram. Two domains are designated: (1) low 238U/204Pb (LOMU) derived from the viscous protomantle (VIPMA), and (2) elevated 238U/204Pb (ELMU). The mantle domains evolved from the Earth's primary material between 4.51 and 4.36 Gyr ago, 4.0 and 3.7 Gyr ago, 2.9 and 2.6 Gyr ago, 2.0 and 1.8 Gyr ago, about 0.66 Gyr ago and <0.09 Gyr ago. Melting anomalies of ELMU sources characterize the unstable mantle of Southern Asia, and those of LOMU sources belong to the Japan‐Baikal geodynamic corridor of the transitional region between the unstable mantle of Asia and its stable core. The Late Cenozoic evolution of the Japan‐Baikal geodynamic corridor resulted in cutting the LOMU domain by the Jeju‐Vitim ELMU source line.

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Section: Introductionunclassified

General Pb‐isotope Systematics of Sources for Volcanic Rocks of the Latest Geodynamic Stage in Asia

Рассказов

Chuvashova

Ясныгина

et al. 2019

Geodin. tektonofiz.

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“…Mobile systems of unstable Asia: Indo-Asian (IACZ) and American-Asian (AACZ) collision zones; Central Asian (CAOS) and Olekma-Stanovoy (OSOS) orogenic systems; Baikal (BRS), Circum-Ordoss (CORS), and East China (ECRS) rift systems; Okhotsk-Japan-Philippine (OJP), South China (SC), and Andaman Sea (AS) deep-water basins of back-arc rifting and spreading. The mobile systems and Japan-Baikal geodynamic corridor are shown after [14,66].…”

Section: Strategy For Analysis Of Pb Isotope Datamentioning

confidence: 99%

“…In diagrams (b,c), designated is the Inner Asia common component of volcanic rocks. Data used are from[14,38,66,[109][110][111] and unpublished data of authors.…”

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Mantle Evolution of Asia Inferred from Pb Isotopic Signatures of Sources for Late Phanerozoic Volcanic Rocks

et al. 2020

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We present a systematic study of Pb isotope ages obtained from sources of the late Phanerozoic volcanic rocks from unstable Asia and also volcanic rocks and kimberlites from stable regions of the Siberian and Indian paleocontinents. In the mantle sources, we have recorded events of the Early, Middle, and Late epochs of the Earth’s evolution. Evidence on the Early epoch are preserved in sources of the protolithosphere and viscous lower protomantle likely generated from the Hadean magma ocean about 4.51 and 4.44 Ga and in sources of the viscous upper mantle that acquired low µ and elevated µ (LOMU and ELMU) signatures in the early Archean (4.0–3.7 Ga). The Middle and Late epochs are denoted by sources of the viscous upper mantle that was generated, respectively, in the late Archean-Paleoproterozoic (2.9–2.6 Ga and 2.0–1.8 Ga) and in the Neoproterozoic-late Phanerozoic (0.7–0.6 Ga and < 0.25 Ga). Our results show the specific role of the mantle beneath unstable Asia in terms of globally varied µ signatures and the same mantle epochs in sources of the late Phanerozoic volcanic rocks and kimberlites from stable regions of the Siberian and Indian paleocontinents, but with high μ (HIMU) signatures that are distributed worldwide and explained by sulfide sequestration of Pb from the mantle to the core. We refer the LOMU-ELMU mantle sources to the Asian high-velocity lower mantle domain and propose that the HIMU generating processes were focused mainly in the South Pacific and African low-velocity lower mantle domains in the Middle Mantle Epoch of the Earth’s evolution due to influence of the unbalanced solid core.

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Late Cenozoic high and low temperature magma generation from primordial and age-modified mantle materials beneath Dariganga in Southeast Mongolia: Factors of mantle degassing and adiabatic upwelling

Rasskazov,

Chuvashova,

Yasnygina

et al. 2024

Geosystems and Geoenvironment

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Origin of Melting Anomalies in the Japan-Baikal Corridor of Asia at the Latest Geodynamic Stage: Evolution From the Mantle Transition Layer and Generation by Lithospheric Transtension

Cited by 4 publications

References 7 publications

General Pb‐isotope Systematics of Sources for Volcanic Rocks of the Latest Geodynamic Stage in Asia

General Pb‐isotope Systematics of Sources for Volcanic Rocks of the Latest Geodynamic Stage in Asia

Mantle Evolution of Asia Inferred from Pb Isotopic Signatures of Sources for Late Phanerozoic Volcanic Rocks

Late Cenozoic high and low temperature magma generation from primordial and age-modified mantle materials beneath Dariganga in Southeast Mongolia: Factors of mantle degassing and adiabatic upwelling

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