Ancient thermal anomaly of an active fault system: Zircon fission‐track evidence from Nojima GSJ 750 m borehole samples

Murakami, Masaki; Tagami, Takahiro; Hasebe, Noriko

doi:10.1029/2002gl015679

Cited by 27 publications

(22 citation statements)

References 18 publications

(27 reference statements)

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“…Bigot-Cormier et al 2006;Malusá et al 2005Malusá et al , 2006Wölfler et al 2008); (c) correlation among fault-rock types, deformation mechanisms, hydrothermal regimes and low-temperature geochronometers (Malusá et al 2009); (d) thermochronological analyses of low-temperature systems at short distance across fault zones (Murakami et al 2002;Tagami and Murakami 2007); (e) combination of some of these approaches (Siebel et al 2010). In this work, we will follow the approach that near-surface brittle faulting may lead to thermal anomalies by infiltration of hydrothermal fluids or frictional heating (e.g., Maddock 1983;d'Alessio et al 2003;Otsuki et al 2003;Wölfler et al 2010).…”

Section: Methods Used For Thermochronologymentioning

confidence: 99%

Polyphase movement on the Lavanttal Fault Zone (Eastern Alps): reconciling the evidence from different geochronological indicators

et al. 2011

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The Lavanttal Fault Zone (LFZ) is generally considered to be related to Miocene orogen-parallel escape tectonics in the Eastern Alps. By applying thermochronological methods with retention temperatures ranging from *450 to *40°C we have investigated the thermochronological evolution of the LFZ and the adjacent Koralm Complex (Eastern Alps). 40 Ar/ 39 Ar dating on white mica and zircon fission track (ZFT) thermochronology were carried out on host rocks (HRs) and fault-related rocks (cataclasites and fault gouges) directly adjacent to the unfaulted protolith. These data are interpreted together with recently published apatite fission track (AFT) and apatite (U-Th)/He ages. Sample material was taken from three drill cores transecting the LFZ. Ar release spectra in cataclastic shear zones partly show strongly rejuvenated incremental ages, indicating lattice distortion during cataclastic shearing or hydrothermal alteration. Integrated plateau ages from fault rocks (*76 Ma) are in parts slightly younger than plateau ages from HRs ([80 Ma). Incremental ages from fault rock samples are in part highly reduced (*43 Ma). ZFT ages within fault gouges (*65 Ma) are slightly reduced compared to the ages from HRs, and fission tracks show reduced lengths. Combining these results with AFT and apatite (U-Th)/He ages from fault rocks of the same fault zone allows the recognition of distinct faulting events along the LFZ from Miocene to Pliocene times. Contemporaneous with this faulting, the Koralm Complex experienced accelerated cooling in Late Miocene times. Late-Cretaceous to Palaeogene movement on the LFZ cannot be clearly proven. 40 Ar/ 39 Ar muscovite and ZFT ages were probably partly thermally affected along the LFZ during Miocene times.

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Section: Methods Used For Thermochronologymentioning

confidence: 99%

Polyphase movement on the Lavanttal Fault Zone (Eastern Alps): reconciling the evidence from different geochronological indicators

et al. 2011

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“…In regions with relatively low relief vertically aligned samples from deep boreholes are particularly favourable, since approximations to a true vertical section are possible only in mountainous regions with high relief. This sampling approach has led to many successful applications of FT analysis on borehole cores evaluating the thermal history of sedimentary basins (e.g., Gleadow et al 1983;Green et al 1989;Duddy 1994;Tingate & Duddy 2002;House et al 2002) or revealing the palaeothermal anomalies in different geological settings (Green et al 2001;Murakami et al 2002).…”

Section: Introductionmentioning

confidence: 99%

The low-temperature thermal history of northern Switzerland as revealed by fission track analysis and inverse thermal modelling

Timar-Geng

Fügenschuh

Wetzel

et al. 2006

Eclogae geol. Helv.

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Low-temperature thermal history of N-Switzerland 255 ABSTRACT New zircon and apatite fission track (FT) data from four boreholes, which penetrate the Mesozoic and pre-Mesozoic sediments and crystalline basement of northern Switzerland, are presented. Inverse thermal modelling of the measured apatite FT parameters unravels the low-temperature (below ~120 °C) thermal history of the crystalline basement of northern Switzerland. Zircon FT central and single-grain ages cluster around 250 Ma, thus maximum palaeotemperatures did not exceed ~330 °C after late-Variscan consolidation of the crystalline basement. Apatite FT central ages vary between 25 and 87 Ma. Confined mean track lengths range between 9.3 µm and 11.6 µm, suggesting substantial track annealing within all apatite samples. Modelled time-temperature paths offer a clear picture about the low-temperature thermal history of the crystalline basement of northern Switzerland: Cretaceous cooling is followed by an Eocene heating event and subsequent cooling to present-day temperatures. The Eocene heating episode is contemporaneous with the initial rifting stage of the nearby Upper Rhine Graben and the associated increasing volcanic activity. Crustal-scale faults of the Permo-Carboniferous Trough of northern Switzerland could have acted as major pathways for circulating hydrothermal fluids giving rise to the observed Middle to Late Eocene thermal event. ZUSAMMENFASSUNGNeue Zirkon-und Apatit-Spaltspurdaten werden aus vier Bohrungen, welche die mesozoische und pre-mesozoische Sedimentbedeckung, sowie das oberste kristalline Grundgebirge der Nordschweiz durchteufen, vorgelegt. Inverse thermische Modellierung der gemessenen Apatit-Spaltspurparameter erlaubt, die Niedrigtemperaturgeschichte (unter ~120 °C) des kristallinen Grundgebirges der Nordschweiz zu enträtseln. Die Zirkon-Spaltspuralter (Zentralalter) und die Einzelkornalter zeigen eine Häufung um 250 Ma. Daraus folgt, dass die maximalen Paläotemperaturen nach der spätvariszischen Konsolidierung des Kristallins ~330 °C nicht mehr überschritten haben. Apatit-Spaltspuralter (Zentralalter) variieren zwischen 25 und 87 Ma. Die mittleren Spaltspurlängen reichen von 9,3 µm bis 11,6 µm und weisen auf eine substantielle Ausheilung in den Apatiten hin. Die modellierten Zeit-Temperatur-Pfade bieten ein klares Bild der Niedrigtemperaturgeschichte des kristallinen Grundgebirges in der Nordschweiz: Einer kretazischen Abkühlung folgt ein eozänes Wärmee-reignis und anschliessend eine Abkühlung zur heutigen Temperaturverteilung. Der eozäne Wärmepuls ist zeitgleich mit der initialen Riftingphase des nahegelegenen Oberrheingrabens und der damit verbundenen erhöhten vulkanischen Aktivität. Zum Nordschweizer Permokarbontrog-System gehörige Stö-rungen im Krustenmassstab könnten als Fliesswege für zirkulierende Fluide gedient haben, die zum beobachteten mittel-bis späteozänen thermischen Ereignis führten.

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“…Fig. 1 a Location of Awaji Island, Japan, showing active faults and geology in the Kobe-Osaka area, modified after Lin et al (2015) and Murakami et al (2002). b Nojima fault gouge sampling location, modified after Otsuki et al (2003).…”

Section: Methodsmentioning

confidence: 99%

Generation of billow-like wavy folds by fluidization at high temperature in Nojima fault gouge: microscopic and rock magnetic perspectives

Fukuzawa

Nakamura

Oda

et al. 2017

Earth Planets Space

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Microscopic billow-like wavy folds have been observed along slip planes of the Nojima active fault, southwest Japan. The folds are similar in form to Kelvin-Helmholtz (KH) instabilities occurring in fluids, which implies that the slip zone underwent "lubrication" such as frictional melting or fluidization of fault gouge materials. If the temperature range for generation of the billow-like wavy folds can be determined, we can constrain the physical properties of fault gouge materials during seismic slip. Here, we report on rock magnetic studies that identify seismic slip zones associated with the folds, and their temperature rises during ancient seismic slips of the Nojima active fault. Using a scanning magneto-impedance magnetic microscope and a scanning superconducting quantum interference device microscope, we observed surface stray magnetic field distributions over the folds, indicating that the folds and slip zones are strongly magnetized. This is due to the production of magnetite through thermal decomposition of antiferromagnetic or paramagnetic minerals in the gouge at temperatures over 350 °C. The presence of micrometer-sized finely comminuted materials in the billow-like wavy folds, along with our rock magnetic results, suggests that frictional heatinginduced fluidization was the driving mechanism of faulting. We found that the existence of the magnetized KH-type billow-like wavy folds supports that the low-viscosity fluid induced by fluidization after frictional heating decreased the frictional strength of the fault slip zone.

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Ancient thermal anomaly of an active fault system: Zircon fission‐track evidence from Nojima GSJ 750 m borehole samples

Cited by 27 publications

References 18 publications

Polyphase movement on the Lavanttal Fault Zone (Eastern Alps): reconciling the evidence from different geochronological indicators

Polyphase movement on the Lavanttal Fault Zone (Eastern Alps): reconciling the evidence from different geochronological indicators

The low-temperature thermal history of northern Switzerland as revealed by fission track analysis and inverse thermal modelling

Generation of billow-like wavy folds by fluidization at high temperature in Nojima fault gouge: microscopic and rock magnetic perspectives

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