Were transgressive black shales a negative feedback modulating glacioeustasy in the Early Palaeozoic Icehouse?

Page, Alex; Zalasiewicz, Jan; Williams, Mark; Попов, Л. Е.

doi:10.1144/tms002.6

Cited by 64 publications

(87 citation statements)

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“…The Early Ordovician to Early Silurian time interval represents a period of black shale deposition under stratified and anoxic bottom water conditions in many areas of North Africa, the Middle East and Europe, Fig. 1 (Berry, 2010;Leggett, 1980;Thickpenny and Leggett, 1987;Trela and Podhalanska, 2010;Wilde, 1987) including Poland (Melchin et al, 2013;Page et al, 2007). During the Ordovician-Silurian transition, there were considerable changes in the atmosphere, ocean, biosphere and, hence, in the general marine depositional conditions (Underwood et al, 1997) inextricably linked with the Late Ordovician (End Hirnantian) glacial event (Melchin et al, 2013;Sheehan, 2001).…”

Section: Introductionmentioning

confidence: 99%

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Mustafa

Sephton

Watson

et al. 2015

Marine and Petroleum Geology

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Black shales in the Holy Cross Mountains area of Poland provide a record of environmental change across the Ordovician-Silurian boundary. The changing depositional conditions have generated a variation in organic matter contents above and below the boundary. Investigating the organic constitution of these black shales has the potential to reveal how their organic matter contents were generated and how suitable these rocks and their lateral equivalents may be for exploitation as shale and Silurian rocks, these rocks were buried and subjected to thermal maturation. Rock Eval and Mustafa, K.A., Sephton M.A., Spathopoulos, F., Watson, J.S., Krzywiec, P. Organic geochemical characteristics of black shales across the Ordovician-Silurian boundary in the Holy Cross Mountains, Central Poland, Marine and Petroleum Geology, doi:10.1016/j.marpetgeo.2015.08.018. 2 biomarker thermal maturity parameters all indicate that the organic matter is mature and lies within the oil window. The Ordovician and Silurian shales have direct relevance to recent attempts to discover and exploit shale gas reservoirs in Poland. Our data and interpretations suggest that the relatively low TOC values (<2%) and low maturities for gas generation render these rocks unsuitable for commercial shale gas production. The progressive improvement in conditions for preserving organic matter across the Ordovician-Silurian boundary does, however, leave the possibility that more suitable deposits occur in Early Silurian rocks in other parts of the basin.

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Section: Introductionmentioning

confidence: 99%

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Mustafa

Sephton

Watson

et al. 2015

Marine and Petroleum Geology

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“…Others, by recognising its peak in the mid Aeronian leptotheca 464 Biozone (e.g. Loydell, 1998Loydell, , 2007Johnson, 1996Johnson, , 2010, imply a link with at least part of 465 shoaling episode E. The depiction of a discrete early Aeronian lowering of sea level by Ross 466 and Ross (1996) is replicated in the subsequent curves of Page et al (2007) and Haq and 467 Schutter (2008). It compares with a lower order progradation (Ceg 0 ) seen at Llandovery, but 468 the biostratigraphical dating of this global event is suspect (see Fig.…”

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confidence: 95%

“…Ross and Ross, 1996), imply a wider significance for the basal 456 sedgwickii Biozone flooding surface (9). The late sedgwickii-halli biozonal interval is widely 457 recognised as a period of falling sea levels, shown by Johnson (1996), Ross and Ross (1996) 458 and Page et al (2007) to have reached its acme close to the base of the guerichi Biozone (F).…”

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“…There is no indication of a discrete persculptus Biozone 473 deepening maximum (A), or of a subsequent shallowing event on the scale seen at 474 Llandovery (D). Ross and Ross (1996) and Page et al (2007) depict what appears to be a low deepening at Llandovery (10) appears to show the abrupt termination of the preceding 478 progradation (F) and the rapid onset of deep and distal sedimentation. This is consistent with the onset of regional subsidence and of a period when contemporary 480 orogenesis became the dominant influence on sedimentation within the Welsh Basin (e.g.…”

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confidence: 99%

“…Such exclusion may account for the poor and inconsistent 598 record of events within this interval (see Section 8). However, it is now acknowledged that suggested to Dias-Martinez and Grahn (2007) Ross and Ross, 1996;Loydell, 1998Loydell, , 2007Nestor et al, 2003;Zhang and Barnes, 608 2002b; Page et al, 2007;Haq and Schutter, 2008;Johnson, 2010;Munnecke et al, 2010 log of glacigenic deposits (Fig. 13), a re-advance during the triangulatus 628 Biozone established an extensive, slowly down-wasting ice mass that was sustained 629 throughout much of the Aeronian, prior to an abrupt and marked retreat at or close to the base 630 of the sedgwickii Biozone.…”

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Gauging the impact of glacioeustasy on a mid-latitude early Silurian basin margin, mid Wales, UK

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Stratigraphic and Earth System approaches to defining the Anthropocene

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Stratigraphy provides insights into the evolution and dynamics of the Earth System over its long history. With recent developments in Earth System science, changes in Earth System dynamics can now be observed directly and projected into the near future. An integration of the two approaches provides powerful insights into the nature and significance of contemporary changes to Earth. From both perspectives, the Earth has been pushed out of the Holocene Epoch by human activities, with the mid-20th century a strong candidate for the start date of the Anthropocene, the proposed new epoch in Earth history. Here we explore two contrasting scenarios for the future of the Anthropocene, recognizing that the Earth System has already undergone a substantial transition away from the Holocene state. A rapid shift of societies toward the UN Sustainable Development Goals could stabilize the Earth System in a state with more intense interglacial conditions than in the late Quaternary climate regime and with little further biospheric change. In contrast, a continuation of the present Anthropocene trajectory of growing human pressures will likely lead to biotic impoverishment and a much warmer climate with a significant loss of polar ice.

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Were transgressive black shales a negative feedback modulating glacioeustasy in the Early Palaeozoic Icehouse?

Cited by 64 publications

References 177 publications

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

Gauging the impact of glacioeustasy on a mid-latitude early Silurian basin margin, mid Wales, UK

Stratigraphic and Earth System approaches to defining the Anthropocene

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