Water in the lower crust plays a critical role in rheological layering of the continental lithosphere. Sixteen granulite xenoliths were collected from the Late Devonian Udachnaya and Komsomolskaya kimberlites in the Siberian Craton. Mafic granulite samples experienced pressures of 0.6–1.0 GPa and temperatures of 549°–800°C using the Grt-Cpx (garnet-clinopyroxene) Fe-Mg thermometer, which are consistently lower than equilibrium temperatures of 737°–899°C from the REE-in-Grt-Cpx thermobarometer. Compared with pseudosection calculations, our samples experienced continuous cooling since the last granulite facies metamorphism. Moderate to high water content was measured in clinopyroxene (334–977 ppm H2O), garnet (23–149 ppm H2O), and plagioclase (157–779 ppm H2O), resulting in the bulk water content of 267–707 ppm H2O in granulite samples. Given the very limited later metasomatism and hydrogen loss, water content in granulite xenoliths probably represents in situ water-rich lower crust of the Siberian Craton from 1.8 Ga to the Late Devonian. Clinopyroxene and plagioclase show weak crystallographic preferred orientations, whereas garnet has random orientation. Compared with previous studies, the Precambrian lower crust in stable cratons contains comparable or less water than Phanerozoic lower crust in orogenic belts. Magma underplating in cratons can trigger partial melting of ancient water-rich granulites and produce heterogeneous water distribution in the lower crust.
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Research Article|
September 01, 2021
Water Content and Deformation of the Lower Crust beneath the Siberian Craton: Evidence from Granulite Xenoliths Available to Purchase
Tianlong Jin;
Tianlong Jin
1.
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
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Qin Wang;
1.
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China*
Author for correspondence; email: [email protected].
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Vladislav Shatsky;
Vladislav Shatsky
2.
Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia; and Vinogradov Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch, Irkutsk 664033, Russia
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Yue Liao
Yue Liao
3.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
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Tianlong Jin
1.
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China1.
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
Vladislav Shatsky
2.
Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia; and Vinogradov Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch, Irkutsk 664033, Russia
Yue Liao
3.
School of Earth and Space Sciences, Peking University, Beijing 100871, China*
Author for correspondence; email: [email protected].
Publisher: The University of Chicago Press
Received:
24 Apr 2020
Accepted:
29 Jan 2021
First Online:
03 Nov 2023
Online ISSN: 1537-5269
Print ISSN: 0022-1376
© 2021 The University of Chicago. All rights reserved.
The University of Chicago
The Journal of Geology (2021) 129 (5): 475–498.
Article history
Received:
24 Apr 2020
Accepted:
29 Jan 2021
First Online:
03 Nov 2023
Citation
Tianlong Jin, Qin Wang, Vladislav Shatsky, Yue Liao; Water Content and Deformation of the Lower Crust beneath the Siberian Craton: Evidence from Granulite Xenoliths. The Journal of Geology 2021;; 129 (5): 475–498. doi: https://doi.org/10.1086/716514
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Index Terms/Descriptors
- Asia
- chemical composition
- Commonwealth of Independent States
- continental crust
- continental lithosphere
- crust
- crystallography
- deformation
- Devonian
- fabric
- facies
- geologic thermometry
- granulite facies
- granulites
- igneous rocks
- inclusions
- kimberlite
- lithosphere
- lower crust
- mafic composition
- magmatism
- major elements
- metamorphic rocks
- metamorphism
- metasomatism
- mineral composition
- P-T conditions
- Paleozoic
- partial melting
- Precambrian
- preferred orientation
- rheology
- Russian Federation
- Siberia
- structural analysis
- trace elements
- Udachnaya Pipe
- underplating
- Upper Devonian
- water content
- xenoliths
- Yakutia Russian Federation
- Siberian Craton
- Komsomolskaya Pipe
Latitude & Longitude
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