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Prospect dolerite intrusion information


Prospect dolerite intrusion
Stratigraphic range: Early Jurassic or Middle Jurassic
View of intrusion from Prospect Highway
Typeigneous
OverliesAshfield Shale and Sydney sandstone
Area2.4 kms by 1.4 kms
Thickness76.2 metres (250 ft)
Lithology
Primarypicrite, dolerite, prehnite, basalt, calcite, pegmatite, etc
Location
Coordinates33°49′30″S 150°55′5″E / 33.82500°S 150.91806°E / -33.82500; 150.91806
RegionWestern Sydney, New South Wales
CountryAustralia
ExtentCity of Blacktown and Cumberland City Council
Type section
Named forProspect, New South Wales
Named byGovernor Arthur Phillip and Lieutenant (later Governor) Philip Gidley King[1]

The Prospect dolerite intrusion, or Prospect intrusion, is a Jurassic picrite or dolerite laccolith that is situated in Sydney, New South Wales, Australia.[2] Lying in the heart of Cumberland Plain, in the suburb of Pemulwuy (previously Greystanes), the intrusion is Sydney's largest body of igneous rock, rising to a height of 117 metres (384 ft) above sea level.[3] The site is formed by an intrusion of dolerite rock into Ashfield Shale. At least seven different rock types occur in the intrusion.

The site was formed from around 200 million years ago when volcanic material (hot magmatic fluids) from the Earth's upper mantle moved upwards and then sideways, which produced many different minerals in the upper part. Also known as Prospect Quarry, the eroded residue of the volcanic core became a quarry of the basalt plug that was carried out from 1820s until the late 2000s, where it contributed most of the crushed rock that were used for building construction and roads in the Sydney area. The intrusion comprises: prospect dolerite and prospect teschenite, in addition to an abundance of coarse grained picrite, olivine and its prehnite specimens.[4]

  1. ^ King, P. G. (1793). Hunter, J. (ed.). An Historical Journal of the Transactions at Port Jackson and Norfolk Island. London: Stockdale.
  2. ^ Igneous intrusions by the Australian Museum. 13 November 2018. Retrieved 1 November 2021.
  3. ^ Ashton, W. (2000). Landscape Heritage Assessment: CSIRO Division of Animal Production.
  4. ^ NSW Government Architect's Office, Prospect Hill Heritage Landscape Study and Plan, NSW Department of Commerce, 2008, p 31.

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