Palaeomagnetic and geochemical evaluation of a terrane-linking ignimbrite: evidence for the relative position of the Grampian and Midland Valley terranes in late Silurian time

Trench, Allan; Haughton, Peter D. W.

doi:10.1017/s0016756800014515

Cited by 15 publications

(3 citation statements)

References 45 publications

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“…Drainage in the Lower Old Red Sandstone of the area was generally to the SW, and thus drainage could have been blocked by a combination of the Ochil Lavas and the progradation of alluvial fans from the NW margin of the basin. Evidence (Trench & Haughton 1990) correlating the 'Lintrathen Porphyry' (an ignimbrite) to the NW of the Highland Boundary Fault with the Crawton Group to the SE of the fault implies that there has been little net displacement on the Highland Boundary Fault. However, the great thickness of the Dundee Formation requires rapid subsidence, which was probably fault-related.…”

Section: Dalradianmentioning

confidence: 99%

An Early Devonian lake and its associated biota in the Midland Valley of Scotland

Trewin

Davidson²

1995

Transactions of the Royal Society of Edinburgh: Earth Sciences

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The Tillywhandland fish bed of the Lower Old Red Sandstone in the Strathmore area of the Scottish Midland Valley accumulated in a lake, here called Lake Forfar, which was created suddenly following a period of fluvial deposition. Lake creation may have been due to basin faulting or the disruption of drainage patterns by contemporaneous volcanic activity. The fish bed laminites accumulated in a hydrologically open lake under a seasonal climatic regime. When fully developed, laminites comprise repeated quadruplets of clastic silt/carbonate/organic/green clay–shale laminae averaging 0·5 mm in thickness. Following 2000 years of laminite deposition an increasingly silty succession with thin current-rippled sandstones provided the lake-fill.The fish fauna is dominated by Mesacanthus and Ischnacanthus with rare Euthacanthus, Parexus, Climatius, Vernicomacanthus and Cephalaspis. Most fish carcasses were partially decayed before deposition in the laminites on the poorly oxygenated lake floor. Abundant coprolites are the result of predation on Mesacanthus and small Ischnacanthus, probably by larger Ischnacanthus. Arthropods present include eurypterids (Pterygotus), washed in as near complete exuviae and fragments, and millipeds which were washed in from surrounding terrestrial environments along with plants, of which Parka and Zosterophyllum are common. Bioturbation indicates that conditions were not permanently anoxic during deposition of the laminites.Comparison of our collections with the Mitchell Collection accumulated in the 19th century indicates that Tillywhandland Quarry was the main source of specimens in laminite lithologies labelled ‘Turin Hill’.

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Section: Dalradianmentioning

confidence: 99%

An Early Devonian lake and its associated biota in the Midland Valley of Scotland

Trewin

Davidson²

1995

Transactions of the Royal Society of Edinburgh: Earth Sciences

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“…Both Bluck (2000) and Tanner (2008) present the view that strike-slip movement of the Highland Boundary Fault was limited after the Early Devonian due to the Lintrathen ignimbrite, correlated across the fault (Paterson and Harris, 1969) and constraining lateral movement to a few tens of kilometres (Trench and Haughton, 1990). However, both consider movement on the fault during deposition of the Lower Old Red Sandstone to be plausible.…”

Section: Implications Of a Lochkovian Age For The Cowie Formationmentioning

confidence: 99%

Archetypally Siluro-Devonian ichnofauna in the Cowie Formation, Scotland: implications for the myriapod fossil record and Highland Boundary Fault Movement

Shillito

Davies

2017

Proceedings of the Geologists' Association

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“…The conglomerate beds contain abundant clasts of the lavas. The outcrops were probably once part of a continuous expanse of subaerial volcanic rocks that extended across the major lineaments of the Highland Boundary Fault and Southern Uplands Fault (Trench & Haughton 1990; Browne et al 2002), and occupied at least 100,000 sq. km (Fig.…”

Section: Lower Devonian Lavas In the British Islesmentioning

confidence: 99%

Carbon dioxide drawdown by Devonian lavas

Parnell¹,

MacLeod²,

Hole³

2014

Earth and Environmental Science Transactions of the Royal Socie

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Lower Devonian volcanic rocks in the northern British Isles, especially Scotland, show extensive evidence for contemporaneous subaerial weathering. Basalt and andesite lavas were altered to red iron oxides, commonly accompanied by calcite. Measurement of carbonate contents in 104 samples over a region of 100,000 km2 show an average of 13% calcite. Weighted for outcrop thickness, this represents an estimated 7.3×1016 moles CO2, extracted from surface waters and ultimately the atmosphere. The time frame for this drawdown is difficult to constrain, but complete weathering of a one-metre unit over 1000 years would involve CO2 consumption comparable with the highest rates determined in modern basaltic watersheds. These data demonstrate that volcanic activity can be a major sink, as well as a source for CO2, and provide a data set for modelling of CO2 flux during episodes of volcanic activity in the geological record. The high capacity of the Devonian lavas for CO2 drawdown emphasises the potential of basalts for CO2 sequestration.

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Palaeomagnetic and geochemical evaluation of a terrane-linking ignimbrite: evidence for the relative position of the Grampian and Midland Valley terranes in late Silurian time

Abstract: The proposed correlation of Lower

Cited by 15 publications

References 45 publications

An Early Devonian lake and its associated biota in the Midland Valley of Scotland

An Early Devonian lake and its associated biota in the Midland Valley of Scotland

Archetypally Siluro-Devonian ichnofauna in the Cowie Formation, Scotland: implications for the myriapod fossil record and Highland Boundary Fault Movement

Carbon dioxide drawdown by Devonian lavas

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