Do Neoproterozoic tuffs (Moine) calc-silicate rocks represent metamorphosed tuffs? A geochemical re-appraisal

Richard A. Batchelor

doi:10.1017/S1755691018000063

Do Neoproterozoic tuffs (Moine) calc-silicate rocks represent metamorphosed tuffs? A geochemical re-appraisal

Richard A. Batchelor

School of Earth & Environmental Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

Following the identification of grey quartz–albite–chlorite–calcite–muscovite rocks in Meso- to Neo-proterozoic sequences in Scotland as metamorphosed tuffs of intermediate composition, it has been shown that this lithology will generate calc-silicate rocks at higher metamorphic grades. Both rock types occur as thin beds with sharp contacts with their host, occur as multiple beds in isolated suites, and share chemical compositions suggestive of volcanic sources with tholeiitic andesite affinities. The failure to recognise calc-silicate rocks as tuffs might explain the apparent scarcity of volcanogenic material through c. 220 million years of early Earth history in Scotland.

Original language	English
Pages (from-to)	333-349
Journal	Earth and Environmental Science Transactions Of The Royal Society Of Edinburgh
Volume	107
Issue number	4
Early online date	18 Apr 2018
DOIs	https://doi.org/10.1017/S1755691018000063
Publication status	E-pub ahead of print - 18 Apr 2018

Keywords

Calc-silicates
Tuffs
Moine

Access to Document

10.1017/S1755691018000063

Batchelor_2017_EESTRSE_MoineCalc-silicates_AAM
COPYRIGHT: © The Royal Society of Edinburgh 2018. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1017/S1755691018000063
Accepted author manuscript, 818 KB

Emeritus Fellowship: Are calc-silicate rocks altered volcanic ashes?
Batchelor, R. A. (PI)
The Leverhulme Trust
1/08/09 → 31/10/11
Project: Fellowship
LEVERHULME TRUST F/00 268/AB: NEOPROTEROZOIC EVENTS: DATING THE CLASSIC TORRIDONIAN OF SCOTLAND
Prave, T. (PI) & Batchelor, R. A. (CoI)
The Leverhulme Trust
1/03/05 → 31/12/08
Project: Standard

Cite this

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title = "Do Neoproterozoic tuffs (Moine) calc-silicate rocks represent metamorphosed tuffs? A geochemical re-appraisal",

abstract = "Following the identification of grey quartz–albite–chlorite–calcite–muscovite rocks in Meso- to Neo-proterozoic sequences in Scotland as metamorphosed tuffs of intermediate composition, it has been shown that this lithology will generate calc-silicate rocks at higher metamorphic grades. Both rock types occur as thin beds with sharp contacts with their host, occur as multiple beds in isolated suites, and share chemical compositions suggestive of volcanic sources with tholeiitic andesite affinities. The failure to recognise calc-silicate rocks as tuffs might explain the apparent scarcity of volcanogenic material through c. 220 million years of early Earth history in Scotland.",

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author = "Batchelor, {Richard A.}",

note = "This work was carried out during the tenure of a Leverhulme Emeritus Fellowship (Grant No. EM/20343) held by the author. The grey tuffs were sampled by the author while employed as a Research Fellow funded by a Leverhulme Trust Research Grant (Grant No. F/00268/AB) awarded to Dr. Tony Prave, University of St. Andrews.",

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AB - Following the identification of grey quartz–albite–chlorite–calcite–muscovite rocks in Meso- to Neo-proterozoic sequences in Scotland as metamorphosed tuffs of intermediate composition, it has been shown that this lithology will generate calc-silicate rocks at higher metamorphic grades. Both rock types occur as thin beds with sharp contacts with their host, occur as multiple beds in isolated suites, and share chemical compositions suggestive of volcanic sources with tholeiitic andesite affinities. The failure to recognise calc-silicate rocks as tuffs might explain the apparent scarcity of volcanogenic material through c. 220 million years of early Earth history in Scotland.

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KW - Tuffs

KW - Moine

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Do Neoproterozoic tuffs (Moine) calc-silicate rocks represent metamorphosed tuffs? A geochemical re-appraisal

Abstract

Keywords

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Projects

Emeritus Fellowship: Are calc-silicate rocks altered volcanic ashes?

LEVERHULME TRUST F/00 268/AB: NEOPROTEROZOIC EVENTS: DATING THE CLASSIC TORRIDONIAN OF SCOTLAND

Cite this