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Please take this quick survey to tell us about what happens after you publish a paper. Contributions to Mineralogy and Petrology. July , Cite as. Calcite veins are a common product of hydrothermal fluid circulation. To model whether the reconstructed temperatures represent calcite precipitation or closed-system resetting, the precipitation age must be known. LA-ICP-MS U—Pb dating of calcite is a recently developed approach to direct dating of calcite and can provide precipitation ages for modelling clumped-isotope systematics in calcite veins.
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What do you think about this particular story? Your message to the editors. Your email only if you want to be contacted back. Send Feedback. E-mail the story Using coseismic calcite veins to date New Mexico fault line earthquakes back half a million years. Your friend's email. Given that the THRMs indicate that no bond reordering occurred in the samples, the clumped-isotope data, together with the calcite dating and field and petrographic analyses, can be integrated to provide insight into hydrothermal fluid conditions in the case-study regions.
At this time, subsidence and extension in western Scotland led to a relative sea-level rise and a transition from terrestrial to marine sedimentation Glennie ; Warrington and Ivimey-Cook ; this change in tectonic regime was likely the cause of fracture opening the formation of the veins at Corrie. The coarse blocky calcite vein in sample AR09 could not be dated, but field relationships show that it is cross-cutting the vein from which AR08 was sampled Fig.
The thermal evolution determined by Cogne et al. Volcanic activity, in the form of the Clyde Plateau Lava Formation, was occurring at the time of the host-rock formation, but there is no documented volcanic or magmatic activity at ca.
Clumped-isotope palaeothermometry and LA-ICP-MS U–Pb dating of lava-pile hydrothermal calcite veins
A combination of magmatic and meteoric fluid sources has been documented in active geothermal systems and could be a possibility for Arran. Using clumped isotopes Lu et al.
The ca. However, the amount of available water present in metamorphic rocks along grain boundaries or in fluid inclusions is very small to be of consequence as a fluid reservoir e. Another possible source of the isotopically enriched source fluid for the Arran calcite veins could be highly evaporated seawater.
Marine transgression extended north-westwards over much of Scotland in the late Triassic when the vein precipitatedsuggesting that an evaporated seawater source is a possibility Glennie A purely meteoric fluid source would need to undergo a strong degree of water—rock interaction to achieve the isotopically heavy fluids calculated from the clumped-isotope analysis.
Evidence for water—rock interaction can clearly be seen in the alteration of the host basalt around the veins to an assemblage including hydrous minerals such as chlorite Fig.
It is possible that the calcite veins in their current form do not represent the primary fracture-filling precipitation but instead represent a later open-system recrystallisation via dissolution—reprecipitation. Such recrystallisation would reset the U—Pb age and clumped-isotope systematics e. It should be noted, however, that the calcite in sample AR08 has a fibrous texture and so is likely to represent primary precipitation during opening of a highly restricted fracture aperture e.
The later sample AR09 has a blocky texture, perhaps representing an open fracture through which flow could occur, yields a higher temperature than the fibrous vein. This is more likely to represent a fluid which was warmer than the ambient rock temperature. While it is difficult to be certain without further analysis, it is, therefore, interpreted that the Arran veins represent primary precipitation but from a fluid which has undergone significant water—rock interaction with relatively restricted flow.
The Variscan Orogeny gave rise to E—W extension in Northern Europe in the early Permian Glennie ; Monaghan and Parrishand rift-related alkaline mafic intrusions, lavas, and breccias are widely developed in Ayrshire.
However, at the time of calcite precipitation, there may have been a significant cover thickness of Carboniferous sedimentary rocks, including extensive coal-bearing sequences of the Scottish Coal Measures Group Read et al.Crystals Beneath the Calcite Cap - Rock and Mineral Collecting
However, the palaeogeography of Scotland in the early Permian at the time of calcite precipitation at Loanhead is continental in Pangaea Glennieand therefore, a marine fluid source can be discounted. Lu et al.
The most likely source for the fluids from which the calcite veins precipitated at Loanhead is interpreted to be meteoric water which has undergone some water—rock interaction. While the absolute age could not be measured due to low radiogenic Pb contents, the homogeneity of the isotopic values suggests precipitation in a single event. This is interpreted to have been synchronous with the emplacement of the Mull Central Complex Walker at Walker suggests a hydrothermal reservoir within the ca.
There may have been a component of juvenile magmatic water in the aureole but the clumped-isotope analysis of the calcite veins from Tobermory ca. However, there is no record of glaciation in the Palaeogene in Scotland and the active volcanism along the west of Scotland at this time would render this scenario unlikely Murray A meteoric precipitation water source is deemed most likely for this sample.
Soulsby et al. This could be due to the presence of winter-only precipitation percolating down through the rocks to form the veins, although the hydrothermal system would be expected to be active over much longer timescales e.
A high altitude setting is a more likely cause of a highly isotopically depleted precipitation which was the ultimate fluid source for the vein, as the isotopic composition of water becomes lighter at altitude due to cooler temperatures e. The Mull Plateau Lava Formation is interpreted to be ca. This meteoric water would have percolated down through the lava pile, undergoing some limited water—rock interaction resulting in an isotopic enrichment from its value on precipitation, to the calculated ca.
In the Isle of Mull sample, where a U—Pb date could not be obtained, bond reordering models had to be run for a range of thermal histories, as the calcite precipitation age was not known. This meant that bond reordering could not be eliminated as conclusively as in the Arran and Loanhead samples, where a precipitation age from the LA-ICP-MS U—Pb dating led to more certainty in the thermal history reordering models. This paired approach is shown to be a robust approach to constrain the timing and precipitation temperature of calcite formation, and thus for tracking hydrothermal processes.
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Advertisement Hide. Download PDF. Contributions to Mineralogy and Petrology JulyCite as. Authors Authors and affiliations J. MacDonald J. Faithfull N. Roberts A. Davies C. Holdsworth M. Newton S.
Williamson A. Boyce C. Open Access. First Online: 11 July Introduction Calcite veins are a common product of hydrothermal fluid circulation. Calcite veins from three sites in Scotland were analysed for this study: Arran, Loanhead, and Mull Fig. The samples are from the reddened upper part of the sequence, which is heavily veined with calcite, and primary silicate minerals are pervasively altered. The lower part of the sequence, however, preserves fresh olivine, clinopyroxene and rarer plagioclase.
Later, Palaeogene faults, fractures, and deformation bands are associated with the emplacement of the nearby ca. The thermal influence from the emplacement of the North Arran Granite was low England ; Stevenson and Grove and samples were taken from beyond this.
The basalt host rock adjacent to the veins is highly altered by fluid circulation in both samples, with quartz, chlorite, and haematite present. Both samples exhibit a mix of calcite morphologies with fibrous veins Fig.
Open image in new window. No meaningful age was derived from this sample due to elevated common Pb. Thermal history reordering models THRMs Calcite which has resided in the subsurface at high temperatures ca. THRMs were run for the Arran and Loanhead samples using thermal evolution modelling from apatite fission track and apatite helium data from sample Sct-2 of Cogne et al. Kinetic parameters for both optical and spar labile and refractory calcite from Passey and Henkes were used, but the choice of kinetic parameters did not affect the model output.
U-Pb dating of calcite veins reveals complex stress evolution and thrust sequence in the Bighorn Basin, Wyoming, USA: REPLY. Dating of the Devils Hole Calcite Vein. By R. Lawrence Edwards, Christina D. Gallup. See allHide authors and affiliations. Science 12 Mar Vol. , Issue . for dating fault activity in the East Anatolian and Dead Sea fault zones. P. NURIEL1*, G. In the Duzici Fault, calcite-filled veins and hydraulic frac-.
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We report U-Pb absolute ages of calcite cements from a diffuse vein network documented in the Bighorn Basin (Wyoming, USA), where distinct. U-Pb dating of calcite veins reveals complex stress evolution and thrust sequence in the Bighorn Basin, Wyoming, USA: COMMENT. Jacob O. recently been applied to dating diagenetic calcite in fossils (Li et al., ), and to hydrothermal veins in oceanic crust (Coogan et al., ). These studies.
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Calcite veins are a common product of hydrothermal fluid circulation. Clumped- isotope palaeothermometry is a promising technique for. Feb An improved method of UPb dating of vein calcite formed during deformation is used to determine the age and cause of folding along the south coast. Abstract. An improved method of U–Pb dating of vein calcite formed during deformation is used to determine the age and cause of folding along.
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