
Mikael Calner
Professor

Evidence for rapid environmental changes in low latitudes during the Late Silurian Lau Event: the Burgen-1 drillcore, Gotland, Sweden
Författare
Summary, in English
Erosional outliers are an important component of the Ludlow (Late Silurian) stratigraphy of Gotland, Sweden. However, due to the poor degree of exposure, outcrop studies have not revealed a detailed section from any of these outliers. The first complete stratigraphy of such an erosional remnant. the Burgen outlier, is presented here, based on the recently recovered Burgen-1 drillcore. Stratigraphical units encountered are, from oldest to Youngest, the uppermost Hemse Group (> 35 m), Eke Formation (0.4 m), Burgsvik Formation (3.4 m) and the basal Hamra Formation (12 in preserved). Based on carbon stable isotopes and lithological correlation to nearby outcrops that are zoned by conodonts, it can be concluded that the most profound late Ludlow sedimentary changes took place shortly after the onset of the globally recognized Lau Event (delta(13)C values reach 8.7 parts per thousand in the lower Hamra Formation). Sedimentary changes include development of discontinuity surfaces, widespread occurrence of an intraclastic conglomerate, increased microbial activity (Rothpletzella and Wetheredella), and influx of clastics to the basin. These changes are linked to substantial base-level changes during the event. A general comparison with the Prague basin suggests contemporaneous sedimentary changes on Baltica and on cratonic elements from peri-Gondwana during the event.
Avdelning/ar
- Berggrundsgeologi
Publiceringsår
2006
Språk
Engelska
Sidor
15-24
Publikation/Tidskrift/Serie
Geological Magazine
Volym
143
Issue
1
Dokumenttyp
Artikel i tidskrift
Förlag
Cambridge University Press
Ämne
- Geology
Nyckelord
- Baltica
- Gotland
- Silurian
- microbial
- Lau Event
- stable isotopes
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 0016-7568