Thermal modelling of very long-lived (&gt;140 Myr) high thermal gradient metamorphism as a result of radiogenic heating in the Reynolds Range, central Australia

Alessio, Kiara L.; Hand, Martin; Hasterok, Derrick; Morrissey, Laura J.; Kelsey, David E.; Raimondo, Tom

doi:10.1016/j.lithos.2019.105280

Cited by 11 publications

(10 citation statements)

References 74 publications

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“…The estimated peak conditions of the studied granulites are 850–920°C at ~6 kbar, indicating a prominent LPHT metamorphic event with an apparent geothermal gradient of ~150 C/kbar. The possible heat sources and mechanisms for generating LPHT metamorphism have previously been suggested to be related to (1) upwelling mantle material due to delamination, slab breakoff and ridge subduction (Vilà et al, 2007); (2) underplating of mantle‐derived basaltic magma in continental magmatic arcs (Okay et al, 2014); (3) conductive heat transfer from the thermal boundary layer (mantle) during continental extension (Cipar et al, 2020; Craven et al, 2012; Sandiford & Powell, 1986); and (4) radiogenic heating (Alessio et al, 2020; Clark et al, 2011; Morrissey et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Metamorphic terranes/complexes with thermal gradients exceeding 110°C/kbar (or >35°C/km) are generally categorized as low‐pressure high‐temperature (LPHT) metamorphic regions. Typical examples include the Reynolds Range in Central Australia (Alessio et al, 2020; Clarke & Powell, 1991; Morrissey et al, 2014), Geme Complex in the Central Pontides of Turkey (Okay et al, 2014), Namaqualand Complex in South Africa (Bial et al, 2015; Robb et al, 1999; Waters, 1990), and Central Asian Orogenic Belt (Burenjargal et al, 2014; Zhang et al, 2018). In most cases, LPHT conditions are attained by advective heating because of magmatic accretion (Bodorkos et al, 2002; Burenjargal et al, 2014; Clark et al, 2014; Janoušek et al, 2006; Kuhn et al, 2004; Millonig et al, 2010; Okay et al, 2014; Pitra & De Waal, 2001; Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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P–T–t conditions of Early Palaeozoic low‐P high‐T granulite facies metamorphism in the southern Truong Son Belt, Central Vietnam

Duc

Usuki

et al. 2023

Journal Metamorphic Geology

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High‐grade metamorphic rocks are widely exposed along the SE–NW‐ to E–W‐trending shear zones in the Truong Son Belt, Central Vietnam, but few petrological studies have been conducted in this area. Herein, we report the occurrence of mylonitized granulites that crop out along the Dai Loc shear zone in the southernmost Truong Son Belt. Detailed petrographic analysis, geochemistry and P–T–t estimates of the evolution of two granulite samples are presented to elucidate the formation processes of these high‐grade metamorphic rocks. The results indicate that the rocks underwent two distinct metamorphic cycles. The first cycle (M1) is characterized by coarse‐grained granulite mineral assemblages, defining a tight clockwise P–T path with near‐isobaric heating to a near ultrahigh‐temperature peak at low pressure, followed by cooling. The prograde mineral assemblage (M1a) is indicated by inclusions of cordierite + sillimanite + biotite + quartz + spinel ± plagioclase in coarse‐grained garnet, orthopyroxene and cordierite. The mineral assemblage of garnet + orthopyroxene + cordierite + plagioclase + K‐feldspar + ilmenite + melt ± biotite (M1b) defines the peak P–T conditions of 5.3–6.3 kbar and 850–920°C. Post‐peak cooling (M1c) is marked by the formation of quartz + biotite symplectites around garnet and orthopyroxene. The second cycle involved medium‐pressure amphibolite facies metamorphism (M2), characterized by domainal development of fine‐grained kyanite‐bearing mineral associations. Petrographic observations indicate that these fine‐grained associations were formed during mylonitization. Zircon U–Pb dating reveals that the timing of granulite facies metamorphism appears to be coeval with the intrusion of a post‐collisional granitoid at 430–410 Ma. Granulite facies metamorphism and crustal melting were probably driven by asthenospheric mantle upwelling triggered by slab breakoff during the Early Palaeozoic. Considering previous structural and geochronological studies, the second metamorphic event likely occurred during the Triassic Indosinian orogeny.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

P–T–t conditions of Early Palaeozoic low‐P high‐T granulite facies metamorphism in the southern Truong Son Belt, Central Vietnam

Duc

Usuki

et al. 2023

Journal Metamorphic Geology

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“…The Aileron Province, and particularly the Anmatjira Range area, is typified by abnormally high crustal heat production (Figure 6), generated from highly radiogenic basement (Alessio et al., 2020; Anderson et al., 2013; Sandiford & Hand, 1998). Permian–Triassic crustal heat production in the Aileron Province (∼6 to 4 μW m −3 ; Figure 6) is significantly greater than that observed in the western Murphy Province (∼2 to 1 μW m −3 ; Figure 6) and sub‐surface basement of the Warramunga Province (∼3.5 to 2.5 μW m −3 ; Figure 6), and notably higher than the global crustal average (∼1 μW m −3 ; e.g., Hasterok & Webb, 2017; McLennan & Taylor, 1996; Rudnick et al., 1998), which has produced a highly elevated regional geothermal gradient over time (e.g., Alessio et al., 2020; Anderson et al., 2013; Howlett et al., 2015; Morrissey et al., 2014). In addition, regional metasomatic alteration in this area, partially along shear‐zones, has further weakened the crustal strength of the region (Raimondo et al., 2011).…”

Section: Discussionmentioning

confidence: 99%

Intracontinental Fault Reactivation in High Heat Production Areas of Central Australia: Insights From Apatite Fission Track Thermochronology

Nixon

Glorie

Fernie³

et al. 2022

Geochem Geophys Geosyst

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Deformation, metamorphism and structural reactivation in response to evolving forces at the plate boundaries are interpreted to have occurred across much of central and eastern Australia throughout the Paleozoic-Early-Mesozoic. In the North Australian Craton (NAC; Figure 1), the far-field effects of accretionary orogenesis along eastern Gondwana are traditionally grouped together as the Ordovician-Carboniferous Alice Springs Orogeny, but are unevenly distributed across both basement terranes and overlying sedimentary basins (e.g.,

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“…We argue that progressive sedimentation in the Adelaide Rift Complex, corresponding to increasing pressures, allowed the propagation of already elevated geotherms through the sedimentary pile facilitated by heat produced from the highly HPE-enriched Mesoproterozoic basement (e.g. Alessio et al, 2020;. Once a critical depth was attained and monazite started to form, the onset of prograde metamorphism was recorded.…”

Section: Ark 2016mentioning

confidence: 91%

Th–U powered metamorphism: Thermal consequences of a chemical hotspot

Leeuwen

Hand

Morrissey

et al. 2021

Journal Metamorphic Geology

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The Arkaroola region of the northern Flinders Ranges, South Australia, records high geothermal gradient mineral assemblages that are not spatially or temporally associated with intrusive magmatism. Cordierite-bearing schists from the base of a ~12 km thick Neoproterozoic sedimentary sequence known as the Adelaide Rift Complex directly overlie Mesoproterozoic metasedimentary and granitic rocks with regional heat production values of ~7.9 µW/m 3 at 580 Ma, two to three times greater than global average values for granitic rocks. We integrate in-situ U-Pb monazite geochronology, Y+HREE-in-monazite thermometry and mineral equilibria modelling to show that rocks at the base of the sedimentary succession record amphibolite facies metamorphism at c. 580 Ma while the overlying sediments were still accumulating. Metamorphism took place under average geothermal gradient conditions in excess of 180°C/kbar (>60°C/km) that propagated to depths of at least 12 km. These thermal gradients persisted for upwards of 150 Ma, maintained by a lack of crustal erosion, and are documented by long-lived crustal anatexis. This system may be the archetypal example of Th-U powered metamorphism, recording the interplay between chemically extreme basement and thermally insulating sedimentary cover.

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Thermal modelling of very long-lived (>140 Myr) high thermal gradient metamorphism as a result of radiogenic heating in the Reynolds Range, central Australia

Cited by 11 publications

References 74 publications

P–T–t conditions of Early Palaeozoic low‐P high‐T granulite facies metamorphism in the southern Truong Son Belt, Central Vietnam

P–T–t conditions of Early Palaeozoic low‐P high‐T granulite facies metamorphism in the southern Truong Son Belt, Central Vietnam

Intracontinental Fault Reactivation in High Heat Production Areas of Central Australia: Insights From Apatite Fission Track Thermochronology

Th–U powered metamorphism: Thermal consequences of a chemical hotspot

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