Lower to Middle Ordovician carbonate sedimentology and stratigraphy of the Pakri peninsula, north-western Estonia
(2016) In Dissertations in Geology at Lund University GEOR02 20151Department of Geology
- Abstract (Swedish)
- Sedimentologi och stratigrafi från senaste tidiga ordovicium till och med mellanordovicium i nordvästra Estland har undersökts. Studien omfattar klippsektioner och Testepere stenbrott på Pakrihalvön, samt en vägskärning utanför staden Tabasalu strax väster om Tallinn. De exponerade lagerföljderna representerar en epeirisk karbonatramp med låg relief som utvecklats i det baltoskandiska grundhavet. Studier av karbonatmikrofacies, hårdbottnar och dess glaukonitinnehåll indikerar högst havsnivåer under etagerna Volkhov (Dapingian) och Kunda (tidig Darriwilian). Lägre havsnivå sammanfaller med gränsen mellan etagerna Volkhov och Kunda. Långsam eller ingen avsättning kännetecknas av den höga halten av glaukonit och/eller hårdbottnar.... (More)
- Sedimentologi och stratigrafi från senaste tidiga ordovicium till och med mellanordovicium i nordvästra Estland har undersökts. Studien omfattar klippsektioner och Testepere stenbrott på Pakrihalvön, samt en vägskärning utanför staden Tabasalu strax väster om Tallinn. De exponerade lagerföljderna representerar en epeirisk karbonatramp med låg relief som utvecklats i det baltoskandiska grundhavet. Studier av karbonatmikrofacies, hårdbottnar och dess glaukonitinnehåll indikerar högst havsnivåer under etagerna Volkhov (Dapingian) och Kunda (tidig Darriwilian). Lägre havsnivå sammanfaller med gränsen mellan etagerna Volkhov och Kunda. Långsam eller ingen avsättning kännetecknas av den höga halten av glaukonit och/eller hårdbottnar. Glaukonitinnehållet är högst i Leetseformationen men förekommer i stora mängder hela vägen till och med Pakriformationen. Hårdbottnar är mestadels av korroderad typ men abraderade förekommer också. Ett exempel på en serie abraderade hårdbottnar är den utbredda "Püstakkiht", i Toilaformationen som markerar gränsen mellan Floian-Dapingian. (Less)
- Abstract
- The sedimentology and stratigraphy of the latest Early Ordovician through Middle Ordovician of northwestern
Estonia has been investigated. The study encompasses coastal cliff sections and the Testepere quarry on the
Pakri peninsula, as well as a road-cut outside the town of Tabasalu just west of Tallinn. The exposed successions
represent a low relief epeiric carbonate ramp developed in the Baltoscandian basin. Study of carbonate microfacies,
hardgrounds and glauconite content indicates a sea level highstand during the Volkhov (Dapingian) or Kunda stages
(early Darriwilian) and a sea level drop coinciding with the Volkhov-Kunda boundary. Slow or non-deposition is
marked by the high content of glauconite and/or hardgrounds. The... (More) - The sedimentology and stratigraphy of the latest Early Ordovician through Middle Ordovician of northwestern
Estonia has been investigated. The study encompasses coastal cliff sections and the Testepere quarry on the
Pakri peninsula, as well as a road-cut outside the town of Tabasalu just west of Tallinn. The exposed successions
represent a low relief epeiric carbonate ramp developed in the Baltoscandian basin. Study of carbonate microfacies,
hardgrounds and glauconite content indicates a sea level highstand during the Volkhov (Dapingian) or Kunda stages
(early Darriwilian) and a sea level drop coinciding with the Volkhov-Kunda boundary. Slow or non-deposition is
marked by the high content of glauconite and/or hardgrounds. The glauconite content is highest in the Leetse Formation
but exists in high amounts also all the way through the Pakri Formation. Hardgrounds are mostly of corroded
character but abraded hardgrounds are present, such as the widespread “Püstakkiht” hardground complex, which
marks the Floian-Dapingian boundary in the Toila Formation. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8880998
- author
- Brådenmark, Niklas LU
- supervisor
-
- Mikael Calner LU
- Oliver Lehnert LU
- organization
- course
- GEOR02 20151
- year
- 2016
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- berggrundsgeologi, ordovicium, baltoskandiska grundhavet, havsnivå, kalksten, glaukonit hårdbottnar.
- publication/series
- Dissertations in Geology at Lund University
- report number
- 489
- language
- English
- id
- 8880998
- date added to LUP
- 2016-06-16 11:47:14
- date last changed
- 2016-06-16 13:33:04
@misc{8880998, abstract = {{The sedimentology and stratigraphy of the latest Early Ordovician through Middle Ordovician of northwestern Estonia has been investigated. The study encompasses coastal cliff sections and the Testepere quarry on the Pakri peninsula, as well as a road-cut outside the town of Tabasalu just west of Tallinn. The exposed successions represent a low relief epeiric carbonate ramp developed in the Baltoscandian basin. Study of carbonate microfacies, hardgrounds and glauconite content indicates a sea level highstand during the Volkhov (Dapingian) or Kunda stages (early Darriwilian) and a sea level drop coinciding with the Volkhov-Kunda boundary. Slow or non-deposition is marked by the high content of glauconite and/or hardgrounds. The glauconite content is highest in the Leetse Formation but exists in high amounts also all the way through the Pakri Formation. Hardgrounds are mostly of corroded character but abraded hardgrounds are present, such as the widespread “Püstakkiht” hardground complex, which marks the Floian-Dapingian boundary in the Toila Formation.}}, author = {{Brådenmark, Niklas}}, language = {{eng}}, note = {{Student Paper}}, series = {{Dissertations in Geology at Lund University}}, title = {{Lower to Middle Ordovician carbonate sedimentology and stratigraphy of the Pakri peninsula, north-western Estonia}}, year = {{2016}}, }