Mike Fowler

University of Portsmouth

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Craig Storey

University of Portsmouth

Emilie Bruand

Université de Bretagne Occidentale

Rob Strachan

University of Portsmouth

Hugo Moreira

Université de Montpellier

Chris Clark

Parkland Health & Hospital System

Henrique Bruno

Universidade do Estado do Rio de Janeiro

Inalee Jahn

Curtin University

Richard Taylor

Curtin University

Samuel Moreira Bersan

Universidade do Estado do Rio de Janeiro

Jiyuan Yin

Chinese Academy of Geological Sciences

Cooperative Institutions

University of Portsmouth

Oxford Brookes University

Universidade do Estado do Rio de Janeiro

Curtin University

Chinese Academy of Geological Sciences

Centre National de la Recherche Scientifique

Universidade Federal de Ouro Preto

Northwest University

State Key Laboratory of Continental Dynamics

Czech Academy of Sciences, Institute of Geology

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Titanium Isotope Insights into the Formation and Evolution of Sanukitoid Magmas

Goldschmidt Abstracts (2023)

Laura Spencer Capucine Albert Helen M. Williams Oliver Nebel I. J. Parkinson

10.7185/gold2023.14477

Cite

Citations (0)

High-K calc-alkaline to shoshonitic intrusions in SE Tibet: implications for metasomatized lithospheric mantle beneath an active continental margin

Contributions to Mineralogy and Petrology (2021)

Ren‐Zhi Zhu Ewa Słaby Shaocong Lai Li‐Hui Chen Jiangfeng Qin

Felsic

Lile

10.1007/s00410-021-01843-z

Cite

Citations (7)

Ion microprobe U–Th–Pb age data for zircon. Evidence from U–Pb zircon geochronology for early Neoproterozoic (Tonian) reworking of an Archaean inlier in northeastern Shetland, Scottish Caledonides

Figshare (2016)

Inalee Jahn Rob Strachan Mike Fowler Emilie Bruand Pete D Kinny

Table 2. Ion microprobe U–Th–Pb age data for zircon from samples SH12-004, SH12-009, SH12-014 and SH12-016

Geochronology

Shetland

Microprobe

10.6084/m9.figshare.4232039

Cite

Citations (0)

U−Pb geochronology and microstructural analysis of apatite within a Proterozoic crustal-scale shear zone, Outer Hebrides, NW Scotland

Journal of the Geological Society (2024)

Joe H. Metcalfe Rob Strachan James Darling Mike Fowler Glenn Chapman

U–Pb apatite geochronology is increasingly recognized as a valuable tool for constraining the age of mid-crustal ductile shear zones. The crustal-scale Outer Hebrides Fault Zone (OHFZ) within the Laurentian foreland of the Scottish Caledonides has long been of uncertain age and tectonic significance. Earliest deformation within the OHFZ was associated with top-to-the-NW ductile thrusting that formed a belt of greenschist facies mylonites within host Archean−Paleoproterozoic basement gneisses. Previous estimates for the timing of thrusting vary between c . 1600 Ma and c . 430 Ma. The mylonitic fabrics are defined by a recrystallized assemblage of quartz + albite/oligoclase + sericite + actinolite + epidote + apatite ± calcite, consistent with deformation temperatures of 400–500°C and within the range of reported closure temperatures for Pb diffusion in apatite. U–Pb (LA−ICP−MS) dating of two texturally distinct apatite grain types within the mylonites has yielded ages mostly in the range c . 1100–900 Ma. The OHFZ is therefore interpreted as a Grenville–Sveconorwegian structure that formed during the tripartite collision of Laurentia, Baltica, and Amazonia and the assembly of Rodinia. Supplementary material : U–Pb isotopic data (Table S1), trace element data (Table S2) and laser ablation spot images are available at https://doi.org/10.6084/m9.figshare.c.7084925

Geochronology

10.1144/jgs2023-139

Cite

Citations (2)

LA–ICPMS U–Th–Pb data for zircon standards. Evidence from U–Pb zircon geochronology for early Neoproterozoic (Tonian) reworking of an Archaean inlier in northeastern Shetland, Scottish Caledonides

Figshare (2016)

Inalee Jahn Rob Strachan Mike Fowler Emilie Bruand Pete D Kinny

Table 1. LA–ICPMS U–Th–Pb data for zircon standards

Geochronology

Shetland

10.6084/m9.figshare.4232036

Cite

Citations (0)

Mid-crustal melting in Western Yunnan and its influence on extrusion of the Tibetan Plateau

Research Square (Research Square) (2024)

Ren‐Zhi Zhu Mike Fowler Nigel Harris Shaocong Lai Jess King

Abstract The Himalayan-Tibetan system is growing upward and outward, influenced by mid-lower crustal melting and flow. This study offers a missing geochemical perspective on current geophysics, linking mid-crustal melting beneath SE Tibet to the initiation of transcurrent tectonics that have facilitated the ongoing southeastward extrusion of the Tibetan plateau. New zircon U-Pb data reveal a pulse of Miocene felsic magmatism southeast of the Eastern Himalayan Syntaxis. These have high SiO₂, variable but low ɛ_Hf(t) and high δ¹⁸O which strongly suggest metasedimentary anatexis. Moderate La/Yb and Sr/Y, with high ⁸⁷Sr/⁸⁶Sr_(i) and low ɛ_Nd(t) are comparable with mid-lower crust biotite-bearing granitic gneisses. Together with biotite and zircon thermobarometry, these characteristics suggest biotite-dehydration anatexis in the middle crust. Experimental and rheological data suggest melt fractions (> 10%) sufficient to reduce crustal viscosity and allow rheological accommodation for Miocene extrusion of the plateau, and the continued presence of mid-crustal melt is supported by current geophysical data.

10.21203/rs.3.rs-4715341/v1

Cite

Citations (0)

Petrogenesis of high Ba–Sr plutons from the Northern Highlands Terrane of the British Caledonian Province

Lithos (2008)

Mike Fowler H. Kocks D. P. F. Darbyshire P. B. Greenwood

Petrogenesis

Fractional crystallization (geology)

Ultramafic rock

10.1016/j.lithos.2008.03.003

Cite

Citations (198)

A microcosm of modern crust formation: Evidence from zircon ages, Hf O and Nd Sr isotopes and bulk geochemistry of the Menglian Batholith, SE Tibet

Chemical Geology (2022)

Ren‐Zhi Zhu Shaocong Lai Mike Fowler Jin‐Cheng Xie Sarah Glynn

Batholith

Felsic

Adakite

Underplating

10.1016/j.chemgeo.2022.121276

Cite

Citations (6)

Mineral chemistry of accessory phases in a High Ba-Sr suite: Scottish Caledonian appinites and granites

The EGU General Assembly (2013)

Emilie Bruand Mike Fowler Craig Storey

Crustal evolution is currently governed by plate tectonics and it has been shown that between the Archean and the Phanerozoic major changes in subduction styles occured. Among others, the chemistry of different plutonic rocks through time and the understanding of their petrogenesis have helped to define different stages in the evolution of plate tectonics. An important change around 2.7 Ga led to the genesis of rocks that are the result of a metasomatized mantle wedge: the sanukitoids. This event is interpreted as the result of the evolution from a shallow to a steep subduction style. Modern plate tectonics is now generally generating calc-alkaline suites but exceptions can occur such as the Caledonian (Palaeozoic) high Ba-Sr plutons in northern Scotland. The latter have been interpreted as a modern analogue of the sanukitoids. In this contribution, we aim to study this Caledonian sanukitoid-like suite from northern Scotland. Whole rock chemistry (trace elements and stable isotopes) of these rocks ranging from appinitic to granitoid in composition are well constrained but it has been argued that careful study of accessory phases can give more information on the petrogenesis of the plutons. The incorporation of trace elements and more particularly rare earth elements (REE) into their structures make them ideal to understand petrogenetic processes. Here, we present a detailed petrographic study and systematic analysis of trace elements of apatite, titanite and zircon in a range of plutonic rocks from appinitic to granitoid compositions. Trace elements in these accessory phases give direct access to the crystallisation history of these plutons. With these data, we suggest that apatite and titanite record in-situ crystal fractionation and mixing processes. Whole-rock reverse modelling, using single grain apatite or titanite trace element compositions, give reliable results. These results also highlight the relationship between the appinite and granitoid rocks and their petrogenetic history.

Petrogenesis

Titanite

Anatexis

Trace element

Source

Cite

Citations (0)

Evidence for a late Cambrian juvenile arc and a buried suture within the Laurentian Caledonides of Scotland: Comparisons with hyperextended Iapetan margins in the Appalachian Mountains (North America) and Norway

Geology (2019)

M. Dunk R. A. Strachan Kathryn Cutts Stéphanie Lasalle Craig Storey

Abstract Uranium-lead (U-Pb) zircon dating establishes a late Cambrian (Drumian) protolith age of 503 ± 2 Ma for a trondhjemitic gneiss of the calc-alkaline Strathy Complex, northern Scottish Caledonides. Positive εHf and εNd values from trondhjemitic gneisses and co-magmatic amphibolites, respectively, and an absence of any inheritance in zircon populations support published geochemistry that indicates a juvenile origin distal from Laurentia. In order to account for its present location within a stack of Laurentia-derived thrust sheets, we interpret the complex as allochthonous and located along a buried suture. We propose that a microcontinental ribbon was detached from Laurentia during late Neoproterozoic to Cambrian rifting; the intervening oceanic tract closed by subduction during the late Cambrian and formed a juvenile arc, the protolith of the Strathy Complex. The microcontinental ribbon was reattached to Laurentia during the Grampian orogeny, which transported the Strathy Complex as a tectonic slice within a nappe stack. Peak metamorphic conditions for the Strathy Complex arc (650–700 °C, 0.6–0.75 GPa) are intermediate in pressure between those published previously for Grampian mineral assemblages in structurally overlying low-pressure migmatites (670–750 °C, <0.4 GPa) that we deduce to have been derived from an adjacent backarc basin, and structurally underlying upper amphibolite rocks (650–700 °C, 1.1–1.2 GPa) that we interpret to represent the partially subducted Laurentian margin. This scenario compares with that of the northern Appalachian Mountains and Norway where microcontinental blocks are interpreted to have their origins in detachment from passive margins of the Iapetus Ocean during Cambrian rifting and to have been re-amalgamated during Caledonian orogenesis.

Laurentia

Protolith

Rodinia

Baltica

Orogeny

10.1130/g46180.1

Cite

Citations (18)