New and recalculated radiometric data supporting a carboniferous age for the emplacement of the Bathurst batholith, New South Wales

Facer, R. A.

doi:10.1080/00167617808729052

Cited by 14 publications

(7 citation statements)

References 7 publications

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“…The presence of trernolite and epidote (Ps < 0.25) and the absence of dolomite and diopside in the regional metamorphic assemblages limit possible T-XcOz conditions to 3 8 W O " C and Xco, < 0.5 at PTola, = 200 MPa (2 kbar) according to the data of Kerrick (1977) and Slaughter, Kerrick & Wall (1975). During the late Carboniferous (310 k 7 Ma, see : Evernden & Richards, 1962;Facer, 1978) the Bathurst Batholith intruded the sequence at Diamond Hill. Its thermal aureole covers all but the southernmost part of the area shown in Fig.…”

Section: Geological Settingmentioning

confidence: 92%

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P‐T‐X (CO₂) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

Andrew

1984

Journal Metamorphic Geology

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The Rockley Volcanics from near .Oberon, New South Wales occur within the aureole of the Carboniferous Bathurst Batholith and have been contact metamorphosed at P z 100 f 50 MPa ( I & 0.5 kbar) and a maximum T 'v 565°C in the presence of a C-0-H fluid. Prior to contact metamorphism the volcanics were regionally metamorphosed and altered with the extensive development of actinolite, chlorite, plagioclase, quartz and calcite. The contact metamorphosed equivalents of these rocks have been subdivided into: Ca-poor (cordierite + gedrite), Mg-rich (amphibole + olivine + spinel), mafic (amphibole + plagioclase) and Ca-rich (amphibole +garnet + diopside; diopside + plagioclase; garnet + diopside + wollastonite) rocks.The chemistry of the minerals in the hornfelses was controlled by the bulk rock chemistry and fluid composition. Pargasites and hastingsites as well as an unusual phlogopite with blue green pleochroism, are found in Ca-rich hornfelses. A comparison of the assemblages with experimentally derived equilibria suggests that the fluid phase associated with the Ca-rich hornfelses was water-rich (Xco, = 0.1 to 0.3) while that associated with the Mg-rich hornfelses was enriched in CO, (Xco, > 0.7). The different hornfels types have reacted to contact metamorphism independently in both their solid and fluid chemistries.

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Section: Geological Settingmentioning

confidence: 92%

“…During the late Carboniferous (310 k 7 Ma, see : Evernden & Richards, 1962;Facer, 1978) the Bathurst Batholith intruded the sequence at Diamond Hill. Its thermal aureole covers all but the southernmost part of the area shown in Fig.…”

Section: Geological Settingmentioning

confidence: 99%

P‐T‐X (CO₂) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

Andrew

1984

Journal Metamorphic Geology

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“…Previous studies estimated that the intrusions were emplaced at ca. 310 Ma based on Rb/Sr and K/Ar analyses (Facer, 1978) or with a maximum intrusive age of 330-325 Ma (Rb/Sr analysis, Shaw & Flood, 1993) (Table S1 in Supporting Information S2). Recently, Jeon and Williams (2018) analyzed three samples from the middle and eastern part of the batholith that gave zircon U-Pb ages of 331-328 Ma.…”

Section: Previous Studiesmentioning

confidence: 99%

Cross‐Orogen Granite Migration as an Indicator of Slab Rollback Along Eastern Gondwana

Zhang

Buckman

Mitchell

et al. 2023

Geochem Geophys Geosyst

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Slab rollback during subduction plays a key role in controlling continental growth at convergent plate boundaries. The dynamics of currently subducting slabs can be precisely constrained using geophysical techniques. In contrast, ancient episodes of slab rollback can be difficult to constrain, yet are critical to unlocking the tectonic evolution of long‐lived orogens such as the Phanerozoic Australian Tasmanides of eastern Gondwana. Recognition of ancient slab rollback relies on the identification of the progressive migration of magmatic arcs. Here, we investigate the timing and isotopic variation of ∼90 km of the trans‐orogen migration of the Carboniferous Bathurst Batholith as a potential indicator of slab rollback. U–Pb–Hf isotopes, combined with a regional zircon Hf isotope data set, suggest that the eastward migration of the batholith over ∼18 Myr, from 340.1 to 322.4 Ma, records a maximum slab steepening rate of ∼0.6–1.2° Myr−1 in a relatively stable trench setting. These results provide a magmatic record of Carboniferous slab rollback and establish a missing link between the long‐lived Lachlan and New England orogens of the eastern Gondwanan Tasmanides.

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“…The first deposit of the Sydney Basin in the west-the dacitic and rhyolitic ignimbrites, coherent lavas, and reworked volcaniclastic rocks of the Rylstone Volcanics (Shaw et al, 1989), dated as 292 Ma (Rb/Sr on biotite)-nonconformably overlies the Bathurst Granite, which ranges in age from a mode of 325-320 Ma by Rb/Sr on biotite (S. E. Shaw, personal communication, 1990) to a tail of K/Ar dates of 312 Ma (Evernden and Richards, 1962, GA 197) and 310 Ma (Facer, 1978). The intrusion of the Bathurst Granite postdates the megakinking (Powell, 1984b) of the eastern Australian foldbelt, which underwent regional metamorphism and terminal east-west shortening (Kanimblan Orogeny, Powell et al, 1977) that formed the Hill End synclinorium immediately west of Hampton, with K/Ar ages from metamorphic biotite of 338 ± 10 Ma and 349 ± 10 Ma (Cas et al, 1976), and this intrusion affected the 405 ±11 Ma Wologorong Batholith 25 km south of Hampton generating Rb/Sr dates of biotite of 339 Ma and 348 Ma .…”

Section: Time Relations Central Sydney Basin-nefb (Fig 12 Table 5)mentioning

confidence: 99%

Eastern Australia

Veevers¹,

Conaghan²,

Powell³

et al. 1994

Geological Society of America Memoirs

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The Sydney-Gunnedah-Bowen Basin developed above the junction between (a) the western, early to mid-Paleozoic Lachlan and Thomson Fold Belts, terminally deformed and intruded in the mid-Carboniferous, and (b) the eastern, mid-to late Paleozoic New England Fold Belt (NEFB). Accordingly, the basement of the Sydney-Gunnedah-Bowen Basin varies along strike. In the south, the Sydney-Gunnedah Basin developed above the Late Devonian-Early Carboniferous Andean-type magmatic arc and fore arc, whereas in the north, the Bowen Basin developed behind the magmatic arc. The magmatic arc was displaced by crustal transtension during the latest Carboniferous-Early Permian. During transtension, the NEFB was intruded by S-type granitoids with co-magmatic ignimbrites and uplifted during right-lateral shearing to form the initial stage of an orocline.Thereafter to the end of the Triassic, eastern Australia developed through seven stages: Stage A (290-268 Ma), extension-volcanism of the collapsed Kanimblan-NEFB upland with thick volcanics and sediment, was a local manifestation of the first release of Pangean-induced heat and is comparable with the vast magmatic province of the same age that developed after the Variscan Orogeny in Europe. A glacio-eustatic marine transgression at 277 Ma crossed the NEFB to reach the newly formed Bowen and Sydney Basins. Stage B (268-258 Ma), a marine sag on the platform and embryonic magmatic arc/foreland basin, brought the sea to the western edge of the Bowen-Gunnedah-SydneyBasin and covered Tasmania. The first tuff attributable to the north-migrating convergent magmatic arc reached Tasmania 265 Ma, and the first convergent granitoid reached the NEFB also at 265 Ma and was followed by the deposition of coarse sediment in the embryonic foreland basin. Stage C (258-250 Ma), orogenic piedmont coal/tuff, initiated the foreland basin between the uplift of the mature NEFB and a foreswell that bounded the Galilee, Coorabin, and Tasmania Basins of the western craton. In Stage D (250-241 Ma), orogenic piedmont redbeds barren of coal and tuff, the sea was driven from the foreland basin by climactic outpouring of volcanolithic sediment from granitoids in the orogenic upland. Waning plutonic activity in the narrowing NEFB upland led to Stage E (241-235 Ma), a cratonic quartz-sand sheet that covered the entire foreland basin.Stage F (235-230 Ma), orogenic paralic sediment, saw a final pulse of sediment shed from the overthrusted NEFB. The terminal deformation and uplift of the NEFB represents the northern part of the Gondwanide event that involved the entire Panthalassan margin to South America in the final episode of the foreland basin/orogen. The final Stage G (230-200 Ma) involved rifting of the orogen by right-lateral transtension to form the Tarong and Ipswich coal and volcanic basins in a second release of Pangean heat. By the Early Jurassic, cratonic quartz sand breached the NEFB upland at the Queensland-New South Wales border. The modern New England upland dates from the mid-Cretaceous inception of the East...

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New and recalculated radiometric data supporting a carboniferous age for the emplacement of the Bathurst batholith, New South Wales

Cited by 14 publications

References 7 publications

P‐T‐X (CO₂) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

P‐T‐X (CO₂) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

Cross‐Orogen Granite Migration as an Indicator of Slab Rollback Along Eastern Gondwana

Eastern Australia

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New and recalculated radiometric data supporting a carboniferous age for the emplacement of the Bathurst batholith, New South Wales

Cited by 14 publications

References 7 publications

P‐T‐X (CO2) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

P‐T‐X (CO2) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

Cross‐Orogen Granite Migration as an Indicator of Slab Rollback Along Eastern Gondwana

Eastern Australia

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Product

Resources

About

P‐T‐X (CO₂) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia

P‐T‐X (CO₂) conditions in mafic and calc‐silicate hornfelses from Oberon, New South Wales, Australia