Research output: Contribution to journal › Article › peer-review
Mantle-triggered intrusions in the western Central Asian Orogenic Belt : implications for the fertilisation of the crust in Tian Shan, Uzbekistan. / Choulet, Flavien; Seltmann, Reimar; Divaev, Farid; Shatov, Vitaly; Konopelko, Dmitry.
In: International Journal of Earth Sciences, Vol. 111, No. 8, 11.2022, p. 2691-2714.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Mantle-triggered intrusions in the western Central Asian Orogenic Belt
T2 - implications for the fertilisation of the crust in Tian Shan, Uzbekistan
AU - Choulet, Flavien
AU - Seltmann, Reimar
AU - Divaev, Farid
AU - Shatov, Vitaly
AU - Konopelko, Dmitry
N1 - Publisher Copyright: © 2022, Geologische Vereinigung e.V. (GV).
PY - 2022/11
Y1 - 2022/11
N2 - Mantle intrusive rocks (lamproites and basalts) were collected from different units of the Uzbek Tian Shan, Central Asia to investigate xenoliths and xenocrysts aiming at tracking the shallow or deep nature of the mantle source. Whole-rock geochemistry and petrography revealed that these rocks are mostly of basaltic composition and may contain various exotic materials. These rocks originate from composite mantle magmas; they often result from the mixing between an evolved primary melt and more primitive melts, as indicated by the composition and textures of clinopyroxenes. Olivine, orthopyroxene and spinel mineral geochemistry from xenocrysts and lherzolitic xenoliths is consistent with a shallow mantle source (spinel lherzolite). Trace element content of clinopyroxenes shows LREE depletion supporting the removal of the magma from an undepleted sub-continental lithospheric mantle. The latter one is heterogenous, though and some parts recorded evidence of intense metasomatism. The upwelling asthenospheric magmas, emplacing in trans-lithospheric structures, were probably directly transferred into the crust or just below the crust, without significantly changing the geochemical composition of the sub-continental lithospheric mantle.
AB - Mantle intrusive rocks (lamproites and basalts) were collected from different units of the Uzbek Tian Shan, Central Asia to investigate xenoliths and xenocrysts aiming at tracking the shallow or deep nature of the mantle source. Whole-rock geochemistry and petrography revealed that these rocks are mostly of basaltic composition and may contain various exotic materials. These rocks originate from composite mantle magmas; they often result from the mixing between an evolved primary melt and more primitive melts, as indicated by the composition and textures of clinopyroxenes. Olivine, orthopyroxene and spinel mineral geochemistry from xenocrysts and lherzolitic xenoliths is consistent with a shallow mantle source (spinel lherzolite). Trace element content of clinopyroxenes shows LREE depletion supporting the removal of the magma from an undepleted sub-continental lithospheric mantle. The latter one is heterogenous, though and some parts recorded evidence of intense metasomatism. The upwelling asthenospheric magmas, emplacing in trans-lithospheric structures, were probably directly transferred into the crust or just below the crust, without significantly changing the geochemical composition of the sub-continental lithospheric mantle.
KW - Central Asia
KW - Lamproites
KW - Mantle magma
KW - Tian Shan
KW - Xenocrysts
KW - Xenoliths
KW - TRACE
KW - TIEN-SHAN
KW - A-TYPE GRANITES
KW - PARTITION-COEFFICIENTS
KW - NW CHINA
KW - MINERAL SYSTEMS
KW - ORTHO-PYROXENE
KW - SPINEL PERIDOTITE XENOLITHS
KW - MURUNTAU GOLD DEPOSIT
KW - GEODYNAMIC EVOLUTION
UR - http://www.scopus.com/inward/record.url?scp=85125623477&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/9f1d5721-e05f-306b-9be5-7495e383da56/
U2 - 10.1007/s00531-022-02172-7
DO - 10.1007/s00531-022-02172-7
M3 - Article
AN - SCOPUS:85125623477
VL - 111
SP - 2691
EP - 2714
JO - International Journal of Earth Sciences
JF - International Journal of Earth Sciences
SN - 1437-3254
IS - 8
ER -
ID: 93304726