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sapropel

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Journal Article
Published: 01 November 2019
Russ. Geol. Geophys. (2019) 60 (11): 1278–1299.
...G.A. Leonova; T.A. Kopoteva; V.N. Melenevskii; A.E. Maltsev; M.A. Klimin; V.A. Bobrov Abstract —We present results of study of the chemical composition of organic matter (C, H, N, and S) from Holocene sections of lake sapropels with undisturbed stratification penetrated by vibratory drilling...
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Journal Article
Journal: Geology
Published: 25 September 2019
Geology (2019) 47 (11): 1088–1092.
...Nicole J. Bale; Rick Hennekam; Ellen C. Hopmans; Denise Dorhout; Gert-Jan Reichart; Marcel van der Meer; Tracy A. Villareal; Jaap S. Sinninghe Damsté; Stefan Schouten Abstract Sapropels are organic-rich sediment layers deposited in the eastern Mediterranean Sea during precession minima, resulting...
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Journal Article
Journal: Interpretation
Published: 13 February 2019
Interpretation (2019) 7 (2): T293–T308.
... analysis of the pyrolysis oil and pyrolysis gas. The results indicate that the surface sediments had poor to fair gas-prone hydrocarbon generation potential and that the type of insoluble OM was III-IV. The macerals were dominantly vitrinite, followed by sapropelic amorphogen. Bulk geochemistry data...
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Journal Article
Published: 01 October 2018
Italian Journal of Geosciences (2018) 137 (3): 452–464.
... epibathyal palaeonvironment in this Eastern Mediterranean area reacted to the palaeoclimate changes with the water mass stratification (warm periods) and/or with enhanced primary productivity (cool/cold periods) leading to the deposition of sapropel layers with different degrees of bottom oxygenation...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 2017
AAPG Bulletin (2017) 101 (11): 1835–1858.
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2016
AAPG Bulletin (2016) 100 (1): 1–16.
... carbon) in the rock and by its hydrogen content. Type I and II kerogens are dominated by sapropelic organic matter commonly deposited under oxygen-restricted conditions in marine or lacustrine environments. These kerogens are characterized by high H/C ratios and typically break down to form oil and gas...
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Journal Article
Published: 01 November 2014
Journal of Sedimentary Research (2014) 84 (11): 961–974.
... imaging of eastern Mediterranean sapropels (Pliocene–Pleistocene age from Ocean Drilling Program drill sites) was performed on samples prepared by Ar-ion cross-section polishing. The immaturity of marine kerogen in these rocks allows inspection of petrographic textures without overprints related...
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Journal Article
Journal: Geology
Published: 01 October 2012
Geology (2012) 40 (10): 919–922.
...Alice M. Milner; Richard E.L. Collier; Katherine H. Roucoux; Ulrich C. Müller; Jörg Pross; Stavros Kalaitzidis; Kimon Christanis; Polychronis C. Tzedakis Abstract The deposition of sapropels in the eastern Mediterranean Sea is thought to occur during intervals of intensified African monsoon...
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Journal Article
Published: 01 February 2011
Italian Journal of Geosciences (2011) 130 (1): 106–118.
...Luigi Vigliotti; Alessandra Asioli; Caterina Bergami; Lucilla Capotondi; Andrea Piva Abstract The youngest sapropel S1 has been investigated by a multiproxy study on a core (ET99-M11) collected in the western Ionian Sea at a water depth of 2800 m, which is considered to represent anoxic conditions...
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Journal Article
Journal: Palynology
Published: 01 January 2009
Palynology (2009) 33 (1): 1–24.
... yr BP. The high African monsoon index for this pre-Holocene time corresponds with pollen evidence of relatively high Nile discharge. The organic-rich S1 sapropel sediments, dated as around 9,500–6,270 yr BP, were deposited several thousand years later, during a time of lower Monsoon index, warmer...
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Journal Article
Published: 01 May 2008
Journal of Micropalaeontology (2008) 27 (1): 45–61.
...SIMONA STEFANELLI; LUCILLA CAPOTONDI Abstract Foraminifera were investigated across the sapropel unit corresponding to insolation cycle 90 deposited in three different oceanographic and depositional settings of the Mediterranean Sea (Alboran Sea, South Adriatic Sea and Ionian Sea). The constant...
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Journal Article
Journal: Geology
Published: 01 August 2007
Geology (2007) 35 (8): 675–678.
... to climate forcing, driving large-scale hydrographic adjustments throughout the eastern Mediterranean and beyond. 17 03 2007 24 02 2007 16 03 2007 Geological Society of America 2007 Mediterranean Sea thermohaline circulation sapropels stable isotopes biomarkers...
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Journal Article
Published: 01 March 2006
Bulletin de la Société Géologique de France (2006) 177 (2): 79–88.
... was therefore a true sapropel at the time of deposition. This result indicates that anoxic conditions are not a prerequisite for sapropelic sediment formation. However, the pristine concentration of the organic carbon in the dark layers at Punta Piccola is lower than those of coeval sapropels cored...
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Journal Article
Published: 01 January 2006
Journal of the Geological Society (2006) 163 (1): 185–204.
... for the placement and age of archaeological sites in the Koobi Fora Formation, and for ages of mammalian faunas (including hominids). Many tuffs were deposited during a 90 ka interval during which Mediterranean sapropels are lacking, suggesting that Nile flow was reduced, and that the level of a lake that occupied...
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Journal Article
Journal: Geology
Published: 01 November 2005
Geology (2005) 33 (11): 889–892.
...Leon Moodley; Jack J. Middelburg; Peter M.J. Herman; Karline Soetaert; Gert J. de Lange Abstract Clarification of the factors involved in the formation of unusual ancient organic carbon– rich deposits (like eastern Mediterranean sapropels) is central in understanding oceanic carbon cycling...
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Journal Article
Journal: PALAIOS
Published: 01 February 2005
PALAIOS (2005) 20 (1): 64–77.
... France; Erbacher et al., 1999 ; Holbourn et al., 2001a ). This suggests that OAE 1b deposition did not occur under stable environmental conditions, and was characterized by short-term changes. Similar repopulation events have been reported from Quaternary Mediterranean sapropels (e.g., Rohling et al...
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Journal Article
Journal: Geology
Published: 01 July 2004
Geology (2004) 32 (7): 565–568.
...-Matthews , M. , Ayalon , A. , and Kaufmann , A. , 2000 , Timing and hydrological conditions of sapropel events in the Eastern Mediterranean, as evident from speleothems, Soreq cave, Israel: Chemical Geology , v. 169 p. 145 - 156 . Burton , K.W. , and Vance , D. , 2000...
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Journal Article
Journal: Geology
Published: 01 July 2002
Geology (2002) 30 (7): 615–618.
... data on postdepositional aerobic OM degradation at natural oxidation fronts in sediments of the late Quaternary Madeira Abyssal Plain f-turbidite and the last eastern Mediterranean sapropel (S1) reveals a stable ranking of the OM components with respect to their degree of degradation. In contrast...
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Journal Article
Journal: Geology
Published: 01 April 2002
Geology (2002) 30 (4): 303–306.
... this interval, two major climatic events occurred in the region; the sapropel S6 layer formed ca. 176 ka in the eastern Mediterranean basin owing to the increase in the African monsoon, and another event, although not large enough to form sapropel, occurred ca. 151 ka. The isotopic composition of Soreq Cave...
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Journal Article
Published: 01 January 2002
Micropaleontology (2002) 48 (1): 87–91.