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Pyroxene Ar-40/Ar-39 Dating of Basalt and Applications to Large Igneous Provinces and Precambrian Stratigraphic Correlations
Zi, Jian-Wei1,2; Haines, Peter W.3; Wang, Xuan-Ce4; Jourdan, Fred2,4; Rasmussen, Birger5; Halverson, Galen P.6; Sheppard, Stephen7; Li, Chao-Feng8
2019-08-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume124Issue:8Pages:8313-8330
AbstractCorrelations within and between Precambrian basins are heavily reliant on precise dating of volcanic units (i.e., tuff beds and lava flows) in the absence of biostratigraphy. However, felsic tuffs and lavas are rare or absent in many basins, and direct age determinations of Precambrian basaltic lavas have proven to be challenging. In this paper, we report the first successful application of Ar-40/Ar-39 dating to pyroxene from a Neoproterozoic basalt unit, the Keene Basalt in the Officer Basin of central Australia. Ar-40/Ar-39 analyses of igneous pyroxene crystals yielded an age of 752 4 Ma (mean squared weighted deviation = 0.69, p = 72%), which is underpinned by Ar-40/Ar-39 plagioclase age (753.04 0.84 Ma) from the basalt. This age is significant because the Keene Basalt is one of the very few extrusive igneous rocks identified within the Neoproterozoic successions of central Australia and is potentially an important time marker for correlating the Neoproterozoic stratigraphy within, and beyond, the central Australian basins. Our geochronological and geochemical data show that the Keene Basalt, which is characterized by enriched elemental and Nd-Pb isotopic signatures, is strikingly similar to, and coeval with, the 755 3 Ma Mundine Well Dolerite in northwestern Australia. Here we suggest that both are part of the same large igneous province (similar to 6.5 x 10(5) km(2)) related to breakup of the supercontinent Rodinia. This study demonstrates the potential of pyroxene Ar-40/Ar-39 geochronology to date ancient flood basalts and to provide pivotal time constraints for stratigraphic correlations of Precambrian basins. Plain Language Summary Ancient basaltic lavas erupted on Earth's crust hold critical clues about the tectonic and igneous history of geologic past and are important for correlating Precambrian stratigraphy and reconstructing supercontinents. However, constraining the crystallization age of basaltic lavas proves challenging due to the dearth of commonly used uranium-lead geochronometers such as zircon in such rocks. In this research, we applied Ar-40/Ar-39 dating of pyroxene and plagioclase to establish the eruption age of a critical basalt lava suite, the Keene Basalt, in the Neoproterozoic Officer Basin in central Australia. The new age, combined with geochemical constraints, contributes to conclusively defining the genetic affinity and geodynamic setting of the basalt unit. Application of pyroxene Ar-40/Ar-39 dating to terrestrial basalts represents an important technical breakthrough, and we report the first successful result for a Precambrian basalt. The robustly dated Keene Basalt is an important time marker for correlating the Neoproterozoic successions and associated glacial deposits in Australia and worldwide. The new age and geochemistry of the basalt are used to test its relationship to known Neoproterozoic igneous events. Our data, integrated with existing evidence, reveals a 755- to 750-Ma large igneous province related to Rodinia breakup.
Keywordpyroxene Ar-40/Ar-39 dating Keene Basalt Mundine Well Dolerite large igneous province Neoproterozoic
DOI10.1029/2019JB017713
Funding OrganizationState Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities
WOS KeywordNEOPROTEROZOIC GLACIAL DEPOSITS ; WELL DYKE SWARM ; WESTERN-AUSTRALIA ; SOUTH-AUSTRALIA ; OFFICER BASIN ; MANTLE BENEATH ; EXCESS AR-40 ; AGE ; GEOCHRONOLOGY ; CONSTRAINTS
Language英语
Funding ProjectState Key Lab of Geological Processes and Mineral Resources[MSFGPMR19] ; State Key Lab of Geological Processes and Mineral Resources[GPMR201802] ; National Natural Science Foundation of China[41873062] ; Fundamental Research Funds for the Central Universities[310827163412]
Funding OrganizationState Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Lab of Geological Processes and Mineral Resources ; State Key Lab of Geological Processes and Mineral Resources ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000491283500041
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95695
Collection岩石圈演化国家重点实验室
Corresponding AuthorZi, Jian-Wei
Affiliation1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Hubei, Peoples R China
2.Curtin Univ, John de Laeter Ctr, Bentley, WA, Australia
3.Geol Survey Western Australia, East Perth, WA, Australia
4.Curtin Univ, Sch Earth & Planetary Sci, Bentley, WA, Australia
5.Univ Western Australia, Sch Earth Sci, Perth, Australia
6.McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ, Canada
7.Calidus Resources Ltd, Perth, WA, Australia
8.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Zi, Jian-Wei,Haines, Peter W.,Wang, Xuan-Ce,et al. Pyroxene Ar-40/Ar-39 Dating of Basalt and Applications to Large Igneous Provinces and Precambrian Stratigraphic Correlations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(8):8313-8330.
APA Zi, Jian-Wei.,Haines, Peter W..,Wang, Xuan-Ce.,Jourdan, Fred.,Rasmussen, Birger.,...&Li, Chao-Feng.(2019).Pyroxene Ar-40/Ar-39 Dating of Basalt and Applications to Large Igneous Provinces and Precambrian Stratigraphic Correlations.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(8),8313-8330.
MLA Zi, Jian-Wei,et al."Pyroxene Ar-40/Ar-39 Dating of Basalt and Applications to Large Igneous Provinces and Precambrian Stratigraphic Correlations".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.8(2019):8313-8330.
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