Within the Late Precambrian crystalline complexes of the Arzybei and Shumikha blocks two contrasting geochemical types of granitoids of tonalite-trondhjemite series have been distinguished — high- and low-alumina, similar in petrogeochemistry to “continental” and “oceanic” plagiogranitoids, respectively (according to the classification by J. Art). The geologic position, composition, and petrogenesis of the granitoids evidence their formation under strongly different PT-conditions related to the development of island-arc systems. The available data show that such associations of tonalites and trondhjemites of two types are also present in other Precambrian subductional complexes. The coexistence of high- and low-alumina tonalites and trondhjemites testifies to contrasting PT-conditions of formation of their parental melts in subduction settings. The high-alumina varieties resulted from high-pressure melting of metabasic rocks of the subducting oceanic slab, whereas the low-alumina ones are the products of fractional crystallization of basaltic melt or low-pressure melting of metabasic rocks at the initial stage of evolution of island arcs or during the back-arc spreading. The above association can be considered indicative for Precambrian oceanic suprasubduction settings.
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Research Article|
May 01, 2002
TONALITE-TRONDHJEMITE COMPLEXES OF SUBDUCTION-RELATED SETTINGS (by the example of Late Riphean plagiogranitoids of the southwestern margin of the Siberian Platform)
O.M. Turkina
O.M. Turkina
Institute of Geology, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
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O.M. Turkina
Institute of Geology, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
Publisher: Novovsibirsk State University
Received:
25 Dec 2000
First Online:
29 Oct 2022
Online ISSN: 1878-030X
Print ISSN: 1068-7971
© 2002 UIGGM, SIBERIAN BRANCH OF THE RAS
UIGGM, SIBERIAN BRANCH OF THE RAS
Russ. Geol. Geophys. (2002) 43 (5): 420–433.
Article history
Received:
25 Dec 2000
First Online:
29 Oct 2022
Citation
O.M. Turkina; TONALITE-TRONDHJEMITE COMPLEXES OF SUBDUCTION-RELATED SETTINGS (by the example of Late Riphean plagiogranitoids of the southwestern margin of the Siberian Platform). Russ. Geol. Geophys. 2002;; 43 (5): 420–433. doi:
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Index Terms/Descriptors
- aluminum
- amphibolites
- Asia
- chemical composition
- Commonwealth of Independent States
- diorites
- fractional crystallization
- gneisses
- igneous rocks
- Krasnoyarsk Russian Federation
- magmas
- major elements
- metals
- metamorphic rocks
- numerical models
- P-T conditions
- partial melting
- plagiogranite
- plutonic rocks
- Precambrian
- Proterozoic
- rare earths
- restites
- Riphean
- Russian Federation
- Siberian Platform
- tonalite
- trace elements
- trondhjemite
- upper Precambrian
- Mana River
- Kan River
- Arzybei Block
- Shumikha Block
- Kuvai Massif
- Arzybei Massif
Latitude & Longitude
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