Talk:Siljan (lake)
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[edit] Oil seeps
If anyone's watching this....can you confirm if there are ANY reports of oil seeps in the Siljan Ring? You can report this over at abiogenic petroleum origin or my talkpage as it would help greatly in resolving some of the weird shite going around there, namely in conjunction with
Rolinator 15:15, 3 March 2006 (UTC)
- I can only find that drillings for oil were made near lake Siljan in 1869 , but they only found water [1].
- Here is a book reference: Boden,A., Eriksson,K.G. (1988). The Deep Gas Drilling in the Siljan Impact Structure that I found on [2]. Maybe that's of interest?
- Fred-Chess 17:17, 3 March 2006 (UTC)
- Full title is Deep drilling in crystalline bedrock: Proceedings of the international symposium held in Mora and Orsa, September 7-10, 1987, Volume 1:The deep gas drilling in the Siljan impact structure. Volume 2 is on other topics. (SEWilco 03:39, 15 August 2006 (UTC))
Cheers. Siljan was drilled in 1976, to answer Thomas Gold's abiogenic origin of petroleum theory. It was proposed as the best site to test the theory because it was a ~300Ma old meteorite craer infilled with sediments which were not mature enough to generate biogenic oil. A 7.5km deep borehole was completed and found only 8 barrels of an oil-like substance later found to be diesel contmination of the drilling muds. I had not, however, heard of oil seeps, and it appears this is a myth. Rolinator
- "Some 15 tons of oil were pumped up," [3] And with a quick look I found two mentions of Siljan oil seeps. [4][5] (SEWilco 06:55, 14 August 2006 (UTC))
Hi - I have done a lot of geological field work in the area, and yes, there are oil seeps in the Siljan area, but not of abiological origin. Oil seeps can be found in the limestone quarries, especially in the old Solberga quarry on the eastern side of the impact structure. Vlierboon et al. (1986) concluded that the oil matured as a consequence of the residual heat of the impact event, and the soucre rocks were probably local shales (even though it can't be excluded that the limestone itself acted both as a source rock and reservoir). The amount of oil is clearly small, and it is of no commercial interest. /Tomas Hode, PhD.
Reference: Vlierboom, F.W., Collini, B. and Zumberge, J.E., 1986. The occurrence of petroleum in sedimentary rocks of the meteor impact crater at Lake Siljan, Sweden. Advances in Organic Geochemistry, 10, 153–161.
[edit] Largest crater in Europe?
At 80 km, Puchezh-Katunki crater is larger. I just can't decide whether to reword this as "second largest", or to try to find the right term to restrict this to the non-Russian portion of Europe. Or perhaps just a footnote is needed. Slightly similar to the highest mountain issue. --GregU 18:32, 19 February 2007 (UTC)
- How about side-stepping the issue by calling it the largest visible crater in Europe? There may be many more buried craters which haven't been discovered. (SEWilco 19:24, 19 February 2007 (UTC))
- That may be short-changing its stature, as the majority of known European craters are not visible, but this is larger than all of them other than this one in Russia. I'm leaning towards a footnote. --GregU 20:28, 19 February 2007 (UTC)
- There is also Popigai in eastern Russia (Siberia), 100 km diameter and well exposed at surface. You could say "largest crater in western Europe" or perhaps "largest on the Baltic Shield". --Zamphuor 22:42, 19 February 2007 (UTC)
- Popigai crater is far east of the Urals, and just east of the Chersky Range, so is it part of Europe? (SEWilco 05:19, 20 February 2007 (UTC))
- No... However Kara crater is another larger Russian crater that is in Europe... just barely. So that bumps Siljan down to third if you count the far eastern part of Europe. --GregU 05:58, 20 February 2007 (UTC)
- Kara "crater is not exposed to the surface". Describe Siljan as "one of the largest European craters, and one with visible ring features" ? (SEWilco 16:08, 22 February 2007 (UTC))
