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Carbonatites as recorders of mantle-derived magmatism and subsequent tectonic events: An example of the Gifford Creek Carbonatite Complex, Western Australia

Published on Mar 1, 2019in Lithos 3.91
· DOI :10.1016/j.lithos.2019.01.028
Paul Slezak1
Estimated H-index: 1
(JCU: James Cook University),
Carl Spandler27
Estimated H-index: 27
(JCU: James Cook University)
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Abstract
Abstract The Gifford Creek Carbonatite Complex (GCCC), Western Australia contains a diverse suite of alkaline igneous rocks, including magnesiocarbonatites, ferrocarbonatites, phoscorites, fenites, magmatic-hydrothermal peralkaline dykes, and ironstones. This study employs U-Pb, Sm-Nd, and Lu-Hf radiogenic isotope techniques on monazite – (Ce), fluorapatite, and zircon to determine the origin, age, and history of the GCCC. Zircon crystals found in glimmerite alteration selvages adjacent to ferrocarbonatites exhibit pyramidal crystal morphologies, eHf values of −1.8 to −4.3, high Th/U, and variable Zr/Hf, all of which are indicative of carbonatitic zircon sourced from an enriched mantle component. Uranium-Pb dating of these zircons returned a definitive magmatic age of ~1370 Ma for the GCCC. Monazite hosted in the ferrocarbonatites, phoscorites, and fenite alteration assemblages yielded variable U-Pb ages ranging from ca. 1250 Ma to 815 Ma. Neodymium isotope isochrons determined from coexisting monazite and apatite gave ages between ca. 1310 Ma to ca. 1190 Ma, but all with similar initial 143 Nd/ 144 Nd values of 0.51078–0.51087. The 1370 Ma age of the GCCC does not correspond to any known mantle plume activity, but does broadly correlate with the separation of the North China Craton from the West Australian Craton as part of the greater breakup of Nuna. The monazite and apatite eNd data illustrate that the multiple younger U-Pb monazite and Nd isotope isochron ages are not recording multiple magmatic intrusions into the complex, but rather represent partial recrystallisation/resetting of REE-bearing minerals during the protracted tectonic history of the Western Australia Craton from ~1300 Ma to 815 Ma and its involvement in the breakup of Nuna and assembly and disassembly of Rodinia. The age variability in the U-Pb and the Sm-Nd isotope systems in monazite and apatite reveal that tectonically-induced hydrothermalism can contribute to the isotopic resetting of phosphate minerals. This age resetting, if properly identified, can be used as a thorough geochronological record of tectonism affecting alkaline igneous complexes after initial magmatic emplacement.
  • References (84)
  • Citations (2)
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References84
Newest
Published on Nov 1, 2018in Geology 5.01
Shuan-Hong Zhang23
Estimated H-index: 23
,
Richard E. Ernst43
Estimated H-index: 43
(Carleton University)
+ 3 AuthorsGuo-Hui Hu1
Estimated H-index: 1
Published on Oct 1, 2018in Precambrian Research 3.83
J. Camilla Stark2
Estimated H-index: 2
(Curtin University),
Xuan Ce Wang1
Estimated H-index: 1
(Curtin University)
+ 3 AuthorsJian-Wei Zi6
Estimated H-index: 6
(China University of Geosciences)
Abstract The Archean Yilgarn Craton in Western Australia hosts at least five generations of mafic dykes ranging from Archean to Neoproterozoic in age, including the craton-wide ca. 2408 Ma Widgiemooltha and the 1210 Ma Marnda Moorn Large Igneous Provinces (LIP), the 1888 Ma Boonadgin dykes in the southwest and the 1075 Ma Warakurna LIP in the northern part of the craton. We report here a newly identified NNW-trending mafic dyke swarm, here named the Biberkine dyke swarm, in the southwestern Yilg...
Published on Sep 1, 2018in Canadian Mineralogist 1.40
Paul Slezak1
Estimated H-index: 1
(JCU: James Cook University),
Carl Spandler27
Estimated H-index: 27
(JCU: James Cook University),
Kevin Blake14
Estimated H-index: 14
(JCU: James Cook University)
Published on Sep 1, 2018in Geology 5.01
Carl Spandler27
Estimated H-index: 27
(JCU: James Cook University),
Johannes Hammerli7
Estimated H-index: 7
(UWA: University of Western Australia),
Cassian Pirard7
Estimated H-index: 7
(JCU: James Cook University)
Neodymium isotope geochemistry is pivotal to understanding magma genesis and crustal recycling processes at convergent plate margins. Here, we present Nd isotope compositions of rare earth element (REE)–rich minerals from blueschist- to eclogite-facies rocks that represent previously subducted continental sediments. We find Nd isotope heterogeneity in all of our samples. Apatite preserves diverse detrital isotopic compositions despite metamorphism up to at least 600 °C and 3.0 GPa, whereas lawso...
Published on Feb 9, 2018in Geology 5.01
Song Wenlei1
Estimated H-index: 1
(PKU: Peking University),
Xu Cheng2
Estimated H-index: 2
(PKU: Peking University)
+ 7 AuthorsHaiyan Tang1
Estimated H-index: 1
(JLU: Jilin University)
The unique, giant, rare earth element (REE) deposit at Bayan Obo, northern China, is the world’s largest REE deposit. It is geologically complex, and its genesis is still debated. Here, we report in situ Th-Pb dating and Nd isotope ratios for monazite and Sr isotope ratios for dolomite and apatite from fresh drill cores. The measured monazite ages (361–913 Ma) and previously reported whole-rock Sm-Nd data show a linear relationship with the initial Nd isotope ratio, suggesting a single-stage evo...
Published on Aug 1, 2017in Lithos 3.91
Roger H. Mitchell39
Estimated H-index: 39
(Lakehead University),
Thomas Chudy2
Estimated H-index: 2
(UBC: University of British Columbia)
+ 1 AuthorsWUFuyuan87
Estimated H-index: 87
(CAS: Chinese Academy of Sciences)
Abstract Apatites from the Verity, Fir, Gum, Howard Creek and Felix carbonatites of the Blue River (British Columbia, Canada) area have been investigated with respect to their paragenesis, cathodoluminescence, trace element and Sr–Nd isotopic composition. Although all of the Blue River carbonatites were emplaced as sills prior to amphibolite grade metamorphism and have undergone deformation, in many instances magmatic textures and mineralogy are retained. Attempts to constrain the U–Pb age of th...
Published on Jul 1, 2017in Chemical Geology 3.62
Jian-Wei Zi6
Estimated H-index: 6
(Curtin University),
Courtney J. Gregory6
Estimated H-index: 6
(Curtin University)
+ 2 AuthorsJanet R. Muhling20
Estimated H-index: 20
(UWA: University of Western Australia)
Abstract Carbonatites are carbonate-dominated igneous rocks derived by low-degree partial melting of metasomatized mantle, although the geodynamic processes responsible for their emplacement into the crust are disputed. Current models favor either reactivation of lithospheric structures in response to plate movements, or the impingement of mantle plumes. Geochronology provides a means of testing these models, but constraining the age of carbonatites and related metasomatic events is rarely strai...
Published on Apr 1, 2017in Precambrian Research 3.83
Shuan-Hong Zhang23
Estimated H-index: 23
(Ministry of Land and Resources of the People's Republic of China),
Yue Zhao3
Estimated H-index: 3
(Ministry of Land and Resources of the People's Republic of China),
Yongsheng Liu48
Estimated H-index: 48
(China University of Geosciences)
Abstract The Bayan Obo in the northern North China Craton (NCC) is the world’s largest light rare earth element (LREE) deposit and is hosted in carbonatite sills emplaced into sedimentary rocks of the Bayan Obo Group. However, the timing and genesis of the Bayan Obo deposit has been highly controversial for many decades. Here we report a precise zircon 208 Pb/ 232 Th age of 1301 ± 12 Ma (N = 47, mean square of weighted deviates [MSWD] = 2.2) for a REE-Nb-rich carbonatite sill from the Bayan Obo ...
Published on Apr 1, 2017in Chemical Geology 3.62
Sebastian Tappe21
Estimated H-index: 21
(UJ: University of Johannesburg),
Natalie B. Brand1
Estimated H-index: 1
(UJ: University of Johannesburg)
+ 6 AuthorsRoger H. Mitchell39
Estimated H-index: 39
(Lakehead University)
Abstract Neoproterozoic kimberlite, ultramafic lamprophyre, and carbonatite magmatic activity was widespread across the Canadian-Greenland Shield. Models to explain the preponderance of this deeply-derived CO 2 -rich magmatism between 680–540 Ma range from impingement of multiple mantle plumes to rifting activity linked to the breakout of the Laurentian plate from the Rodinia supercontinent configuration. We add to the debate about the origin of kimberlite magmas and evaluate possible mantle sou...
Published on Jan 1, 2017in Precambrian Research 3.83
Xiaoyong Yang19
Estimated H-index: 19
(USTC: University of Science and Technology of China),
Xiaodong Lai5
Estimated H-index: 5
(USTC: University of Science and Technology of China)
+ 3 AuthorsWeidong Sun47
Estimated H-index: 47
Abstract The Bayan Obo deposit in Inner Mongolia, North China Craton (NCC) is the largest rare-earth element (REE) resource in the world. Due to the complex element and mineral compositions and the activity of several geological events, the ore-forming mechanism is still controversial. Previous models are reviewed here to provide information for further investigation on the Bayan Obo deposit. In this study, we summarize all different types of Fe-REE-Nb mineralization using field observations and...
Cited By2
Newest
Published on Jun 25, 2019in Mineralogy and Petrology 1.57
Teimoor Nazari-Dehkordi1
Estimated H-index: 1
(JCU: James Cook University),
Carl Spandler27
Estimated H-index: 27
(JCU: James Cook University)
This study investigates the paragenesis and ore mineral composition of xenotime [(Y,HREE)PO4] and florencite [LREEAl3(PO4)2(OH)6] from heavy rare earth element (HREE) deposits/prospects of the Tanami and Hall Creek regions of Western Australia. Two stages of xenotime-(Y) formation are recognized: (1) early xenotime-(Y) in breccias (breccia-hosted) and in quartz-xenotime-(Y) veins (vein-type); and (2) late xenotime-(Y) that occurs largely as dipyramidal-shaped overgrowths on the pre-existing earl...
Published on May 2, 2019in Mineralium Deposita 3.40
Teimoor Nazari-Dehkordi1
Estimated H-index: 1
(JCU: James Cook University),
Carl Spandler27
Estimated H-index: 27
(JCU: James Cook University)
+ 1 AuthorsRobin Wilson2
Estimated H-index: 2
Metasedimentary rock-hosted heavy rare earth element (HREE) mineralization occurs as numerous orebodies distributed across a large district of the Tanami region of central Australia, close to a regional unconformity between Archean metasedimentary rocks of the Browns Range Metamorphics (BRM) and overlying Proterozoic Birrindudu Group sandstones. The orebodies consist predominantly of quartz, xenotime, and minor florencite and occur along steeply dipping structures within a stockwork of hydrother...