Portal de Periódicos da CAPES

SEVEN SEDIMENTARY ROCK REFERENCE SAMPLES FROM ESTONIA

2000; Estonian Academy Publishers; Volume: 17; Issue: 3 Linguagem: Inglês

10.3176/oil.2000.3.02

1736-7492

Tarmo Kiipli, A Batchelor, Juan Pablo Bernal, C Cowing, M Hagel-Brunnström, Mark Ingham, David P. Johnson, J. Kivisilla, C Knaack, Peter Kump, Rufino Lozano-Santacruz, D Michiels, K Orlova, E Pirrus, Ronald Rousseau, Jan Růžička, H. Sandström, J. P. Willis,

Marine and environmental studies

The major oxide and trace element compositions of seven sedimentary rock reference samples (claystone, organic-rich argillite, two limestones, dolostone, sandstone and feldspathized volcanic ash) are presented.Among studied samples the organic-rich argillite ("Dictyonema shale") 15 conspicuous for wide range of chemical elements with higher contents than in common sedimentary rocks.The content of 68 elements and components has been determined.Tallinn Technical University, Estonia.Two samples (Es-14 and Es-15) were prepared later in 1996.The sample set includes common silicate and carbonate rocks but also organic-rich argillite ("Dictyonema shale") characterized by higher content of many elements.The initial weight of the samples was about 5 kg.Rock material selected for sampling exhibits visual homogeneity (except bedded limestone Es-14) and intensive mixing was used to improve it.In 1998 a project of international calibration of the seven Estonian samples was initiated.An XRF discussion group in the Internet (address: XRF-L@LISTSERV.SYR.EDU) served as a helpful medium for connecting people from laboratories all over the world. Geological Data of the SamplesThe location of sampling sites 1s presented in the Figure.Es-1 Silty, mottled, greenish-gray claystone of Early Cambrian Lontova age from the central part of the Kestla Member.Sampled from the upper quarry for cement production near the town of Kunda [2].Es-2 Organic-rich, brown graptolite-argillite of Early Ordovician Pakerort age.Sampled in Tallinn from a temporary outcrop at Lasnamée, 0.5-1.5 m below the upper boundary of the Tiirisalu Formation [3]. Es-3Organogenic, gray limestone of Middle Ordovician age.Sampled from an old quarry at Lasnamie (Tallinn), 2.0-2.4 m below the upper boundary of the Vdo Formation.Description of the section about 1 km from the sampling site is given in [4, s]. Es-4Finely crystalline, gray dolostone of Lower Silurian age; Raikkiila Stage.Sampled from the Miindi quarry, Central Estonia [6]. Es-5Mottled gray and red sandstone of Middle Devonian age; Burtnieki Stage.Sampled from the Suur-Taevaskoja outcrop near the Ahja River [7]. Es-14Micritic, yellowish-white limestone of Lower Silurian age; Raikkiila Stage.Sampled from the Taagepera core (South Estonia) from the depth interval of 319.0-319.6 m.The Taagepera core is stored in Geological Survey of Estonia.