气候变化领域集成服务门户(CCPortal): Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents

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DOI	10.1130/B35237.1
	Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents
	Gumsley A.; Stamsnijder J.; Larsson E.; Söderlund U.; Naeraa T.; De Kock M.; Sałacińska A.; Gawȩda A.; Humbert F.; Ernst R.
发表日期	2020
ISSN	167606
起始页码	1829
结束页码	1844
卷号	132 期号:2021-09-10
英文摘要	U-Pb geochronology on baddeleyite is a powerful technique that can be applied effectively to chronostratigraphy. In southern Africa, the Kaapvaal Craton hosts a well-preserved Mesoarchean to Paleoproterozoic geological record, including the Neoarchean Ventersdorp Supergroup. It overlies the Witwatersrand Supergroup and its world-class gold deposits. The Ventersdorp Supergroup comprises the Klipriviersberg Group, Platberg Group, and Pniel Group. However, the exact timing of formation of the Ventersdorp Supergroup is controversial. Here we present 2789 ± 4 Ma and 2787 ± 2 Ma U-Pb isotope dilution- thermal ionization mass spectrometry (ID-TIMS) baddeleyite ages and geochemistry on mafic sills intruding the Witwatersrand Supergroup, and we interpret these sills as feeders to the overlying Klipriviersberg Group flood basalts. This constrains the age of the Witwatersrand Supergroup and gold mineralization to at least ca. 2.79 Ga. We also report 2729 ± 5 Ma and 2724 ± 7 Ma U-Pb ID-TIMS baddeleyite ages and geochemistry from a mafic sill intruding the Pongola Supergroup and on an east-northeast-trending mafic dike, respectively. These new ages distinguish two of the Ventersdorp Supergroup magmatic events: the Klipriviersberg and Platberg. The Ventersdorp Supergroup can now be shown to initiate and terminate with two large igneous provinces (LIPs), the Klipriviersberg and Allanridge, which are separated by Platberg volcanism and sedimentation. The age of the Klipriviersberg LIP is 2791-2779 Ma, and Platberg volcanism occurred at 2754-2709 Ma. The Allanridge LIP occurred between 2709-2683 Ma. Klipriviersberg, Platberg, and Allanridge magmatism may be genetically related to mantle plume(s). Higher heat flow and crustal melting resulted as a mantle plume impinged below the Kaapvaal Craton lithosphere, and this was associated with rifting and the formation of LIPs. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184739
作者单位	Department of Geology, Lund University, Lund, Sweden; Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland; Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden; Department of Geology, University of Johannesburg, Johannesburg, South Africa; Institute of Geological Sciences, Polish Academy of Sciences, Warsaw, Poland; Institute of Earth Sciences, University of Silesia in Katowice, Sosnowiec, Poland; Department of Earth Sciences, Carleton University, Ottawa, Canada; Faculty of Geology and Geography, Tomsk State University, Tomsk, Russian Federation
推荐引用方式 GB/T 7714	Gumsley A.,Stamsnijder J.,Larsson E.,et al. Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents[J],2020,132(2021-09-10).
APA	Gumsley A..,Stamsnijder J..,Larsson E..,Söderlund U..,Naeraa T..,...&Ernst R..(2020).Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents.Bulletin of the Geological Society of America,132(2021-09-10).
MLA	Gumsley A.,et al."Neoarchean large igneous provinces on the Kaapvaal Craton in southern Africa re-define the formation of the Ventersdorp Supergroup and its temporal equivalents".Bulletin of the Geological Society of America 132.2021-09-10(2020).