Mineral Geothermobarometry

Ревердатто, В. В.; Лиханов, И. И.; Polyansky, O. P.; Sheplev, V. S.; Kolobov, V. Yu.

doi:10.1007/978-3-030-03029-2_2

Cited by 3 publications

(1 citation statement)

References 141 publications

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“…Based on exchange equilibria, various mineral assemblages (e.g., phengite, sphalerite, hornblende, and clinopyroxene) have been used as "geobarometer" to define differential stress conditions in crustal rocks (see Reverdatto et al, 2019, for a review). However, these "stress proxy" minerals are usually absent in fault zones.…”

Section: Ams and Strain Geometry In Fault Zonesmentioning

confidence: 99%

Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

Yang

Chou

Ferré

et al. 2020

Reviews of Geophysics

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As iron-bearing minerals-ferrimagnetic minerals in particular-are sensitive to stress, temperature, and presence of fluids in fault zones, their magnetic properties provide valuable insights into physical and chemical processes affecting fault rocks. Here, we review the advances made in magnetic studies of fault rocks in the past three decades. We provide a synthesis of the mechanisms that account for the magnetic changes in fault rocks and insights gained from magnetic research. We also integrate nonmagnetic approaches in the evaluation of the magnetic properties of fault rocks. Magnetic analysis unveils microscopic processes operating in the fault zones such as frictional heating, energy dissipation, and fluid percolation that are otherwise difficult to constrain. This makes magnetic properties suited as a "strain indicator," a "geothermometer," and a "fluid tracer" in fault zones. However, a full understanding of faulting-induced magnetic changes has not been accomplished yet. Future research should focus on detailed magnetic property analysis of fault zones including magnetic microscanning and magnetic fabric analysis. To calibrate the observations on natural fault zones, laboratory experiments should be carried out that enable to extract the exact physicochemical conditions that led to a certain magnetic signature. Potential avenues could include (1) magnetic investigations on natural and synthetic fault rocks after friction experiments, (2) laboratory simulation of fault fluid percolation, (3) paleomagnetic analysis of postkinematic remanence components associated with faulting processes, and (4) synergy of interdisciplinary approaches in mineral-magnetic studies. This would help to place our understanding of the microphysics of faulting on a much stronger footing. Plain Language Summary The Earth's surface is riddled with faults that largely contribute to landscape evolution and human activities. Some of these faults produce earthquakes of different magnitudes including some with catastrophic consequences. Understanding faulting mechanisms benefits society when predictions about rupture are made. Fault zones preserve an excellent record of chemical and physical processes involved in failure. Among other analytical methods, magnetic studies prove to be an emergent and untapped source of information on these processes. These methods, focused on prefaulting, synfaulting, and postfaulting mineral changes, have resulted in significant advances in our understanding of the conditions of faulting. In this review, we present an extensive account of the state of knowledge and highlight current challenges and future avenues of fault magnetism research.

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Section: Ams and Strain Geometry In Fault Zonesmentioning

confidence: 99%

Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

Yang

Chou

Ferré

et al. 2020

Reviews of Geophysics

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Garnet major-element composition as an indicator of host-rock type: a machine learning approach using the random forest classifier

Schönig

Eynatten

Tolosana‐Delgado

et al. 2021

Contrib Mineral Petrol

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The major-element chemical composition of garnet provides valuable petrogenetic information, particularly in metamorphic rocks. When facing detrital garnet, information about the bulk-rock composition and mineral paragenesis of the initial garnet-bearing host-rock is absent. This prevents the application of chemical thermo-barometric techniques and calls for quantitative empirical approaches. Here we present a garnet host-rock discrimination scheme that is based on a random forest machine-learning algorithm trained on a large dataset of 13,615 chemical analyses of garnet that covers a wide variety of garnet-bearing lithologies. Considering the out-of-bag error, the scheme correctly predicts the original garnet host-rock in (i) > 95% concerning the setting, that is either mantle, metamorphic, igneous, or metasomatic; (ii) > 84% concerning the metamorphic facies, that is either blueschist/greenschist, amphibolite, granulite, or eclogite/ultrahigh-pressure; and (iii) > 93% concerning the host-rock bulk composition, that is either intermediate–felsic/metasedimentary, mafic, ultramafic, alkaline, or calc–silicate. The wide coverage of potential host rocks, the detailed prediction classes, the high discrimination rates, and the successfully tested real-case applications demonstrate that the introduced scheme overcomes many issues related to previous schemes. This highlights the potential of transferring the applied discrimination strategy to the broad range of detrital minerals beyond garnet. For easy and quick usage, a freely accessible web app is provided that guides the user in five steps from garnet composition to prediction results including data visualization.

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Geologic history of the Sabzevar oceanic Basin, NE Iran: An overview from continental rifting to obduction in the NeoTethys oceanic system

Jafari

Ghasemi

2023

Journal of Asian Earth Sciences

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Mineral Geothermobarometry

Cited by 3 publications

References 141 publications

Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

Garnet major-element composition as an indicator of host-rock type: a machine learning approach using the random forest classifier

Geologic history of the Sabzevar oceanic Basin, NE Iran: An overview from continental rifting to obduction in the NeoTethys oceanic system

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