| Titre | Facies architecture of a subaqueous volcano-sedimentary succession on Bogda Mountains, NW China - evidence of extension in Late Carboniferous |
| |
| Auteur | Memtimin, M; Zhang, Y; Furnes, H; Pe-Piper, G; Piper, D J W ; Guo, Z |
| Source | Geological Journal vol. 54, 2019 p. 1-15, https://doi.org/10.1002/gj.3582 |
| Image |  |
| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190153 |
| Éditeur | Wiley |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1002/gj.3582 |
| Media | papier; en ligne; numérique |
| Formats | pdf (Adobe® Reader®); html |
| Région | Bogda Mountains; Urumqi |
| Lat/Long OENS | 87.5000 88.0833 43.8833 43.6000 |
| Sujets | Carbonifère supérieur; ceintures volcano-sédimentaires; lithofaciès; sediments volcanogènes; milieux tectoniques; volcanisme; affaissement; soulèvement de la croûte; intrusions; evolution du bassin;
paléoenvironnement; antecedents de sedimentation; milieu sédimentaire; géologie du substratum rocheux; lithologie; roches ignées; roches volcaniques; basaltes; laves en oreiller; volcanoclastique; hyaloclastites; pépérites; coulées de lave; roches
intrusives; granites; roches sédimentaires; calcaires; caractéristiques structurales; failles; sédimentation; analyses stratigraphiques; géologie régional; stratigraphie; tectonique; Sciences et technologie; Nature et environnement; Phanérozoïque;
Paléozoïque; Carbonifère |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; diagrammes stratigraphiques; échelles stratigraphiques; coupes lithologiques; tableaux; photographies; photomicrographies; graphiques;
représentations schématiques |
| Programme | Division de la CGC atlantique |
| Diffusé | 2019 07 11 |
| Résumé | (disponible en anglais seulement)
A Late Carboniferous volcano-sedimentary complex outcrops on the southwestern flank of the Bogda Mountains, NW China. The volcanic architecture, spatial
relationships, and emplacement mechanisms of the lithofacies were studied in detail, providing a lithofacies context for previously published structural and geochemical studies and constraining the reconstruction of palaeo-environments. Four distinct
volcano-sedimentary facies are identified in the Qijiagou Formation: close-packed pillow basalts, pillow basalts with interstitial sediments, hyaloclastites, and peperites. Textural features of the lithofacies, especially hyaloclastites and
peperites, provide clear evidence for in situ fragmentation of lava flows, co-volcanic sedimentation of limestone, and intimate interaction between lava, water, and sediments. They demonstrate autochthonous, subaqueous origin of the succession.
Discovery of peperites and stratigraphic transitions of the related lithofacies indicate a progressively deepening subaqueous environment, resembling a volcanic evolution from early stage of eruption at a shallower level to increasingly subsiding
basin with increasing eruption frequency of basaltic lava at greater water depth. Vesicularity of basalts, ambient pressure, and peperitic features indicate eruption depth at between 1,500 and 2,500 m. The deep extensional basin in the Baiyanggou
area was coeval with bimodal volcanism, uplift, and granite intrusion along strike in the region, all indicating continental collision and post-collisional extension. The substantial depth of the Baiyanggou Basin indicates that it may have been a
back-arc or even a residual oceanic basin. |
| GEOSCAN ID | 315026 |
|
|