Permian-Triassic magmatism and Ag-Sb mineralization in southeastern Altai and northwestern Mongolia
Permian-Triassic magmatism and Ag-Sb mineralization in southeastern Altai and northwestern Mongolia (in Large igneous provinces of Asia, mantle plumes and metallogeny, N. L. Dobretsov (prefacer), A. E. Izokh (prefacer) and A. S. Borisenko (prefacer))
Russian Geology and Geophysics (July 2008) 49 (7): 545-555
- absolute age
- Altai Mountains
- Altai Russian Federation
- antimony ores
- Ar/Ar
- Asia
- back-arc basins
- basins
- Cambrian
- carbonate rocks
- Commonwealth of Independent States
- copper ores
- Devonian
- diabase
- diabase porphyry
- dikes
- Far East
- gabbros
- Gorny Altai
- granites
- igneous rocks
- intrusions
- lamprophyres
- lower Mesozoic
- Lower Triassic
- magmatism
- mercury
- Mesozoic
- metal ores
- metals
- mineral deposits, genesis
- mineralization
- Mongolia
- Neoproterozoic
- Paleozoic
- Permian
- Permian-Triassic boundary
- plutonic rocks
- Precambrian
- Proterozoic
- Russian Federation
- sedimentary rocks
- silver ores
- stratigraphic boundary
- terrigenous materials
- Triassic
- Upper Permian
- upper Precambrian
- Vendian
- Chuya Complex
- Terekta-Tolbonur Fault
- Kurai-Kobdo Fault
- Delyun-Yustyd Basin
In the 1980s, Ag-Sb deposits were discovered in a new ore cluster of the Delyun-Yustyd back-arc rift basin in southeastern Altai and northwestern Mongolia. The Delyun-Yustyd basin is filled with up to 9 km thick Devonian volcanosedimentary and terrigenous rocks lying over Vendian-Cambrian carbonate-terrigenous strata. Volcanosedimentary rocks are intruded by D (sub 3) -C (sub 1) granites of the Yustyd complex, as well as by pre-granite mafic rocks, post-granite gabbro-diabase, diabase porphyry dikes, and younger lamprophyre dikes of the Chuya complex (245-236 Ma Ar-Ar biotite age). Ag-Sb ores in the Yustyd cluster formed at the Early Mesozoic stage at 240+ or -1.6 Ma (Early-Middle Triassic boundary) and were thus nearly coeval with the Chuya lamprophyre intrusion. The age of Cu-Ag-Sb-Hg mineralization is about 234.4+ or -1.0 Ma (Ar-Ar, sericite). Sb-Hg mineralization is the latest in the province (231.5+ or -1.0 Ma, Ar-Ar, sericite). Gradual change of Ag-Sb (siderite-tetrahedrite) ores to complex Cu-Ag-Sb-Hg (Hg-Ag-tetrahedrite) and Sb-Hg (cinnabar with Sb sulfosalts and stibnite) mineralization along the Kurai-Kobdo and Terekta-Tolbonur large faults is interpreted as development of stage metallogenic zoning along major ore-controlling faults.
