Giant iron-ore deposits of the Hamersley province related to the breakup of Paleoproterozoic Australia: New insights from in situ SHRIMP dating of baddeleyite from mafic intrusions

Geology (2005)

Stefan Müller Bryan KrapeMark Barley Ian R. Fletcher

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Research Article| July 01, 2005 Giant iron-ore deposits of the Hamersley province related to the breakup of Paleoproterozoic Australia: New insights from in situ SHRIMP dating of baddeleyite from mafic intrusions Stefan G. Müller; Stefan G. Müller 1School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Bryan Krapež; Bryan Krapež 1School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Mark E. Barley; Mark E. Barley 1School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Ian R. Fletcher Ian R. Fletcher 1School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Geology (2005) 33 (7): 577–580. https://doi.org/10.1130/G21482.1 Article history received: 21 Dec 2004 rev-recd: 16 Mar 2005 accepted: 17 Mar 2005 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Stefan G. Müller, Bryan Krapež, Mark E. Barley, Ian R. Fletcher; Giant iron-ore deposits of the Hamersley province related to the breakup of Paleoproterozoic Australia: New insights from in situ SHRIMP dating of baddeleyite from mafic intrusions. Geology 2005;; 33 (7): 577–580. doi: https://doi.org/10.1130/G21482.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Banded iron formations of the ca. 2770–2405 Ma Hamersley province of Western Australia were locally upgraded to high-grade hematite ores during the Early Paleoproterozoic by a combination of hypogene and supergene processes after the initial rise of atmospheric oxygen. Ore genesis was associated with the stratigraphic break between the Lower and Upper Wyloo Groups of the Ashburton province, and has been variously linked to the Ophthalmian orogeny, late-orogenic extensional collapse, and anorogenic continental extension. Small-spot in situ Pb/Pb dating of baddeleyite by sensitive high-resolution ion microprobe (SHRIMP) has resolved the ages of two key suites of mafic intrusions, constraining for the first time the tectonic evolution of the Ashburton province and the age and setting of iron-ore formation. Mafic sills dated as ca. 2208 Ma were folded during the Ophthalmian orogeny and then cut by the unconformity at the base of the Lower Wyloo Group. A mafic dike swarm that intrudes the Lower Wyloo Group and has a close genetic relationship to iron ore is ca. 2008 Ma, slightly younger than a new syneruptive 2031 ± 6 Ma zircon age for the Lower Wyloo Group. These new ages constrain the Ophthalmian orogeny to the period between ca. 2208 and 2031 Ma, before Lower Wyloo Group extension, sedimentation, and flood-basalt volcanism. The ca. 2008 Ma dikes pre s ent a new maximum age for iron-ore genesis and deposition of the Upper Wyloo Group, thereby linking ore genesis to a ca. 2050–2000 Ma period of continental extension similarly recorded by Paleoproterozoic terrains worldwide well after the initial oxidation of the atmosphere by ca. 2320 Ma. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Keywords:

Baddeleyite

Topics:

Geological and Geochemical Analysis

Geochemistry and Elemental Analysis

Paleontology and Stratigraphy of Fossils

10.1130/g21482.1

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Precise U–Pb dating of Paleoproterozoic mafic dyke swarms of the Dharwar craton, India: Implications for the existence of the Neoarchean supercraton Sclavia

Precambrian Research (2010)

Jason E. French Larry M. Heaman

Baddeleyite

Dharwar Craton

Large igneous province

10.1016/j.precamres.2010.05.003

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A new 1.32 Ga Tianshui mafic sill in the Liaodong area and its relations to the Yanliao large igneous province in the northern North China Craton

Precambrian Research (2021)

Xin Ping Wang Peng Peng Chong Wang

Baddeleyite

Sill

Large igneous province

Mantle plume

Primitive mantle

10.1016/j.precamres.2021.106535

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Citations (7)

Baddeleyite U–Pb age and geochemical data of the mafic dykes from South Qinling: Constraints on the lithospheric extension

Geological Journal (2017)

Guishan Zhang Shuwen Liu Wenhua Han Houyi Zheng

The nature of magma sources, time frame, and geodynamic settings of the late Early Paleozoic mafic magmatic activities in the South Qinling Orogen is not clearly understood. The Ziyang area with concentrated and representative outcrops of the late Early Paleozoic mafic dykes was selected as a study area, and detailed petrology, whole‐rock geochemistry, isotopic geochemistry, and baddeleyite U–Pb chronology were combined to reveal the origin of the mafic dykes. Baddeleyite U–Pb chronological study shows that the formation age of the mafic dykes is 425.4 ± 6.4 Ma, indicating they were formed in the Late Silurian. The mafic dykes in the Ziyang area are alkaline rock series, are generally characterized by enriched Rb, Ba, Sr, La, Ce, Nb, and Ta, and have similar geochemical characteristics to those of OIB‐type basalt. The spider diagram of trace elements shows that the mafic dykes are weakly depleted in K and strongly depleted in Zr, Hf, and Ti. The mafic dykes are composed of depleted Nd and Pb isotopes and moderately enriched Sr isotopes, with ε Nd ( t ) = +3.4 to +3.6, ( 87 Sr/ 86 Sr) i = 0.70382–0.70412, ( 206 Pb/ 204 Pb) i = 17.542–17.802, ( 207 Pb/ 204 Pb) i = 15.557–15.569, and ( 208 Pb/ 204 Pb) i = 37.531–37.880. The elemental and isotopic geochemistry shows that the mafic dykes in the Ziyang area did not undergo crustal contamination during formation and that their geochemical characteristics could reflect the characteristics of their source. Amphibole whose formation was related to metasomatism by carbonate fluids was likely present in the mantle source. Therefore, the mantle source might have underwent metasomatism by carbonate fluids. The mantle metasomatism occurred recently, so the metasomatism of mantle source was likely caused by a subducted ocean plate in the early Neoproterozoic. The mafic dykes in the Ziyang area were formed in an intracontinental rift environment, and mantle plume activities were the main cause of the intracontinental rifting.

Baddeleyite

10.1002/gj.3074

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Citations (7)

Pb-Pb baddeleyite ages of mafic dykes from the Western Dharwar Craton, Southern India: a window into 2.21–2.18 Ga global mafic magmatism

Journal of Asian Earth Sciences (2019)

Pooja Yadav D. Srinivasa Sarma V. Parashuramulu

Baddeleyite

Dharwar Craton

Large igneous province

Baltica

10.1016/j.jseaes.2019.104221