Chemistry and petrography of the Marl Slate of S. E. Durham, England

Hirst, Dave; Dunham, K. C.

doi:10.2113/gsecongeo.58.6.912

Cited by 32 publications

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“…Within these parts there are indications that there are contributions to the Mg content other than that from dolomite, suggesting a detrital source for the additional Mg. This source is most likely to be clay minerals, including chlorite and montmorillonite (Hirst & Dunham 1963).…”

Section: Variation In Ca and Mgmentioning

confidence: 99%

“…The Marl Slate represents a relatively short time interval, probably less than 20,000 yr (Oelsner 1959;Hirst & Dunham 1963). The anoxic events are of much shorter duration; sapropel 1 is considered to have lasted 5,000 yr (Magaritz & Turner 1982) and sapropel 2 only a few hundred years.…”

Section: Magaritzmentioning

confidence: 99%

“…The trace metal (particularly base metal) content of the Marl Slate/Kupferschiefer is greater than the average black shale (Hirst & Dunham 1963;Wedepohl 1980) and there has been considerable discussion regarding the source of these metals and how their enrichment took place. Davidson (1962) regarded the mineralization as epigenetic whereas Hirst & Dunham (1963) suggested that the metals may have derived from Palaeozoic mineralization to the west and beneath the Marl Slate and supplied to the Zechstein Sea via submarine springs.…”

mentioning

confidence: 99%

“…Davidson (1962) regarded the mineralization as epigenetic whereas Hirst & Dunham (1963) suggested that the metals may have derived from Palaeozoic mineralization to the west and beneath the Marl Slate and supplied to the Zechstein Sea via submarine springs. However, most authors now acknowledge that metals were probably present in Zechstein seawater and deposited within the Marl Slate as part of the biochemical cycle (Brongersma-Sanders 1965).…”

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confidence: 99%

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Chemical and isotopic studies of a core of Marl Slate from NE England: influence of freshwater influx into the Zechstein Sea

Turner

Magaritz

1986

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SUM M A RY: Detailed mineralogical, chemical and stable isotope analyses have been made of single core through the Marl Slate in order to investigate the Zechstein transgression and its associated mineralization. The core (VT8), drilled by the National Coal Board offthe coast of NE England, contains three subfacies: (1) dark grey, organic-rich, sapropelic siltstones; (2) organic-dolomite laminites; (3) massive finely crystalline dolostones. Two cycles of deposition which include the sequence sapropel~laminite~dolostone are present although the lower one (112 cm) is much thicker than the upper (32 cm).There are some close correlations between the lithological and geochemical variables, including the stable isotope values. The sapropelic units are characterized by high Fe content (as iron sulphide) and strongly negative 6180 values in associated carbonate minerals. Quartz silt and organic carbon are also higher in these units but diminish upwards in each depositional cycle. Each cycle of deposition appears to have been initiated by an influx of freshwater into the Zechstein basin which promoted surface productivity, water stratification and regional anoxic conditions. The relative change in 6'3C to more positive values higher in the Marl Slate is independent oflithological variation and indicates progressive enrichment of ~3C in the Zechstein Sea in response to the precipitation of large amounts of organic matter.The distribution of base metals in the Marl Slate in this core strongly suggests that they were introduced by freshwater influx. Although Pb shows no clear relationship to the depositional cycles, Cu and Zn contents are relatively low in the lower sapropelic parts of the cycles and become higher in the upper parts. We take this to indicate that Cu and Zn sulphides were precipitated interstitially when more 'normal' marine conditions were re-established in the later part of each cycle.

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Section: Variation In Ca and Mgmentioning

confidence: 99%

Section: Magaritzmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Chemical and isotopic studies of a core of Marl Slate from NE England: influence of freshwater influx into the Zechstein Sea

Turner

Magaritz

1986

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“…(b) exposed and denuded mineralization in the Carboniferous rocks (Hirst and Dunham, 1963;King, 1966). Radiometric age determinations of the hydrothermal ores in the Carboniferous rocks of the Derbyshire dome suggest Lower and Upper Permian episodes of mineralization (Ineson and Mitchell, in prep.…”

Section: Origin Of Mineralizationmentioning

confidence: 99%

A Baryte-Galena Vein in the Magnesian Limestone at Whitwell, Derbyshire

Ineson

Richardson

Wood

1972

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Carbon isotopic change at the base of the upper permian zechstein sequence

1981

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Fluctuation of the carbon isotope composition of marine carbonates has recently been developed as a powerful tool for the identification of ocean-wide anoxic conditions and changes in the world budget of carbon and oxygen. A change in 6°C from the normal marine values (0 to +~Y / w ) to values highly enriched in I3C (+3.5 to 4.57') is recorded at the base of the Zechstein sequence both in central

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Chemistry and petrography of the Marl Slate of S. E. Durham, England

Cited by 32 publications

References 0 publications

Chemical and isotopic studies of a core of Marl Slate from NE England: influence of freshwater influx into the Zechstein Sea

Chemical and isotopic studies of a core of Marl Slate from NE England: influence of freshwater influx into the Zechstein Sea

A Baryte-Galena Vein in the Magnesian Limestone at Whitwell, Derbyshire

Carbon isotopic change at the base of the upper permian zechstein sequence

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