A Paleoproterozoic mantle source modified by subducted sediments under the North China craton
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F19%3APU136093" target="_blank" >RIV/00216305:26620/19:PU136093 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0016703718306185" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0016703718306185</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.gca.2018.10.032" target="_blank" >10.1016/j.gca.2018.10.032</a>
Alternative languages
Result language
angličtina
Original language name
A Paleoproterozoic mantle source modified by subducted sediments under the North China craton
Original language description
Subduction is an effective mechanism for deep recycling of supracrustal rocks and mantle refertilization. However, the timing of the onset of modern-style deep subduction is debated. Here we report geochronogical and geochemical data for an intrusive suite of ultramafic, syenitic and carbonatitic rocks, a carbonatite-hosted peridotite xenolith, and granulites from the Paleoproterozoic Trans-North China orogen in the North China craton (NCC). The xenolith differs in composition from typical cratonic mantle peridotites. It equilibrated at T approximate to 1100 degrees C and P approximate to 29 kbar, i.e. under hotter conditions than cratonic mantle xenoliths worldwide. The carbonatites and associated alkaline rocks were emplaced at 1810 +/- 3 Ma and are related to the Paleoproterozoic collision between the Western and Eastern segments of the NCC. These intrusions show Sr-Nd isotope compositions consistent with an enriched mantle source [(Sr-87/Sr-86)(i) = 0.7027-0.7039; epsilon Nd-(t) = -4 to -6], and contain zircon characterized by unradiogenic Hf isotope compositions [epsilon Hf-(t) = -5 to -9] and high delta O-18(smow) values (7.9-9.5 parts per thousand). In contrast, basement granulites and wall-rock granites are enriched in radiogenic Nd and Hf isotopes, but low in O-18. These differences rule out the possibility of crustal contamination. Our results thus suggest that modern-style plate tectonics dates back at least to the Paleoproterozoic Era, and the post-collisional Paleoproterozoic alkaline magmatism in the NCC tapped mantle sources modified by deep sediment recycling.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geochimica et cosmochimica acta
ISSN
0016-7037
e-ISSN
1872-9533
Volume of the periodical
245
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
222-239
UT code for WoS article
000453771600013
EID of the result in the Scopus database
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