Collisional mafic magmatism of the fold-thrust belts framing southern Siberia (Western Sangilen, southeastern Tuva)

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Collisional mafic magmatism of the fold-thrust belts framing southern Siberia (Western Sangilen, southeastern Tuva). / Shelepaev, R. A.; Egorova, V. V.; Izokh, A. E. et al.

In: Russian Geology and Geophysics, Vol. 59, No. 5, 01.05.2018, p. 525-540.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{a0bb910dd25143b4bde81df77e347354,

title = "Collisional mafic magmatism of the fold-thrust belts framing southern Siberia (Western Sangilen, southeastern Tuva)",

abstract = "We consider geochemical features of mafic magmatism manifested during the evolution of a complex nappe-folded structure in Western Sangilen, resulted from the Cambrian-Ordovician collisional tectogenesis. There are abundant ultramafic-mafic and mafic associations of different types in this region: layered low-Ti low-alkali ultramafic-mafic intrusions, high-Ti medium-alkali gabbroids, gabbro-monzodiorite intrusions, and alkali basalts. Isotope-geochronological data showed that these complexes formed over a wide time interval, from 570 to 440 Ma. At this time, the geodynamic setting in Western Sangilen changed from an island-arc one via a collision one to an intercontinental rift setting. At the early and late stages of the evolution of Western Sangilen, the geochemical features of mafites were typical of their geodynamic settings. The properties of mafites that formed synchronously with the collision are of particular interest. The studies have shown that the chemical composition of collisional mafites of Western Sangilen changed with time. They became richer in alkalies, titanium, and incompatible elements. This fact indicates a change in the type of mantle source from suprasubductional in the Cambrian to enriched deeper-level one in the Ordovician.",

keywords = "Cambrian-Ordovician collision, collisional orogen, dunite-wehrlite-clinopyroxenite-gabbro, and alkali basalts, gabbro-monzodiorite, mafic magmatism, peridotite-gabbro, southern Siberia",

author = "Shelepaev, {R. A.} and Egorova, {V. V.} and Izokh, {A. E.} and R. Seltmann",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = may,

day = "1",

doi = "10.1016/j.rgg.2018.04.006",

language = "English",

volume = "59",

pages = "525--540",

journal = "Russian Geology and Geophysics",

issn = "1068-7971",

publisher = "Elsevier Science B.V.",

number = "5",

}

RIS

TY - JOUR

T1 - Collisional mafic magmatism of the fold-thrust belts framing southern Siberia (Western Sangilen, southeastern Tuva)

AU - Shelepaev, R. A.

AU - Egorova, V. V.

AU - Izokh, A. E.

AU - Seltmann, R.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - We consider geochemical features of mafic magmatism manifested during the evolution of a complex nappe-folded structure in Western Sangilen, resulted from the Cambrian-Ordovician collisional tectogenesis. There are abundant ultramafic-mafic and mafic associations of different types in this region: layered low-Ti low-alkali ultramafic-mafic intrusions, high-Ti medium-alkali gabbroids, gabbro-monzodiorite intrusions, and alkali basalts. Isotope-geochronological data showed that these complexes formed over a wide time interval, from 570 to 440 Ma. At this time, the geodynamic setting in Western Sangilen changed from an island-arc one via a collision one to an intercontinental rift setting. At the early and late stages of the evolution of Western Sangilen, the geochemical features of mafites were typical of their geodynamic settings. The properties of mafites that formed synchronously with the collision are of particular interest. The studies have shown that the chemical composition of collisional mafites of Western Sangilen changed with time. They became richer in alkalies, titanium, and incompatible elements. This fact indicates a change in the type of mantle source from suprasubductional in the Cambrian to enriched deeper-level one in the Ordovician.

AB - We consider geochemical features of mafic magmatism manifested during the evolution of a complex nappe-folded structure in Western Sangilen, resulted from the Cambrian-Ordovician collisional tectogenesis. There are abundant ultramafic-mafic and mafic associations of different types in this region: layered low-Ti low-alkali ultramafic-mafic intrusions, high-Ti medium-alkali gabbroids, gabbro-monzodiorite intrusions, and alkali basalts. Isotope-geochronological data showed that these complexes formed over a wide time interval, from 570 to 440 Ma. At this time, the geodynamic setting in Western Sangilen changed from an island-arc one via a collision one to an intercontinental rift setting. At the early and late stages of the evolution of Western Sangilen, the geochemical features of mafites were typical of their geodynamic settings. The properties of mafites that formed synchronously with the collision are of particular interest. The studies have shown that the chemical composition of collisional mafites of Western Sangilen changed with time. They became richer in alkalies, titanium, and incompatible elements. This fact indicates a change in the type of mantle source from suprasubductional in the Cambrian to enriched deeper-level one in the Ordovician.

KW - Cambrian-Ordovician collision

KW - collisional orogen

KW - dunite-wehrlite-clinopyroxenite-gabbro, and alkali basalts

KW - gabbro-monzodiorite

KW - mafic magmatism

KW - peridotite-gabbro

KW - southern Siberia

UR - http://www.scopus.com/inward/record.url?scp=85046690161&partnerID=8YFLogxK

U2 - 10.1016/j.rgg.2018.04.006

DO - 10.1016/j.rgg.2018.04.006

M3 - Article

AN - SCOPUS:85046690161

VL - 59

SP - 525

EP - 540

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 5

ER -

ID: 13333058