...E. Kovaleva; M.S. Huber; F. Zaccarini Abstract Vredefort Granophyre dykes are generally considered to be a part of impact melt, which intruded downward from the melt sheet of the Vredefort impact structure (South Africa). This work reports enigmatic textural inhomogeneities found within the Daskop...

...Christian Koeberl; Wolf Uwe Reimold; Steven B. Shirey Abstract The origin of granophyric rock dikes (the Vredefort Granophyre) at the 2 Ga Vredefort structure in South Africa has been controversial. They have been interpreted as either impact melt or igneous intrusions. Most Vredefort Granophyre...

...A. M. Therriault; W. U. Reimold; A. M. Reid Abstract The Vredefort impact structure contains a suite of granophyric dykes, referred to as the Vredefort Granophyre, occurring within and at the edge of the Archaean basement core. New whole-rock chemical analyses, together with previous data...

...Elizaveta Kovaleva; Dmitry A. Zamyatin; Gerlinde Habler Abstract The Vredefort impact structure, South Africa, is a 2.02 Ga deeply eroded meteorite scar that provides an opportunity to study large impact craters at their lower stratigraphic levels. A series of anomalous granophyre dikes in the core...

.... and Praekelt , H. , 2018 . Pseudotachylite vein hosted by a clast in the Vredefort Granophyre: characterization, origin and relevance . South African Journal of Geology , doi:25131/sajg.121.0002 Lieger , D. and Riller , U. , 2012 . Emplacement history of Granophyre dikes in the Vredefort...

... , P.C. and Reimold , W.U. , 2002 . Planar deformation features and impact glass in inclusions from the Vredefort Granophyre, South Africa . Meteoritics and Planetary Science 37 , 807 – 822 . Cavosie , A.J. , Erickson , T.M. , Timms , N.E. , Reddy , S.M. , Talavera...

...E. Kovaleva; M.S. Huber; F. Roelofse; M. Tredoux; H. Praekelt Abstract A small, meta-granitic clast with a crosscutting microcrystalline vein was found enclosed within the Vredefort Granophyre. Semi-quantitative chemical analyses of the granophyre, granitic clast, and the vein were obtained in situ...

...C. HARRIS; D.S. FOURIE; A. FAGERENG Abstract We have determined the major element composition, δ 18 O and δD values, and water content of impact-related granophyre, and pseudotachylite, from various Vredefort Dome localities, aiming to constrain the mechanism of melt formation and the relationship...

... of locally occurring granitoids and amphibolite. Harmonic least-squares mixing (HMX) calculations also do not indicate that additional components, such as a Vredefort Granophyre-like impact melt intrusive phase, contributed to the formation of these PTB. Absence of evidence (such as significant displacements...

... S.E. , 1986 , Quartz crystallization in igneous rocks : The American Mineralogist , v . 71 , p. 331 – 342 . Therriault A.M. Reimold W.U. Reid A.M. , 1997 , Geochemistry and impact origin of the Vredefort granophyre : South African Journal of Geology , v. 100 , p. 115...

... , p. 416 – 430 , doi:10.1016/j.icarus.2011.11.020 . Kamo S. Reimold W.U. Krogh T.E. Colliston W.P. , 1996 , A 2.023 Ga age for the Vredefort impact event and a first report of shock metamorphosed zircons in pseudotachylitic breccias and granophyre : Earth and Planetary...

... to Paleoproterozoic supracrustal rocks and intrusions ( Fig. 1 ). The rocks display a variety of impact-related features, including shatter cones, coesite and stishovite, planar deformation features in quartz, dikes of impact melt breccia (Vredefort Granophyre, Fig. 1 ), and voluminous pseudotachylitic breccias...

... and Gerdes, 2012 ) and Ventersdorp and Transvaal units ( Stevenson and Patchett, 1990 ) that would have melted to form the Vredefort melt sheet. Because a similar 3.2 Ga Sm-Nd model age is exhibited by the 2.02 Ga bronzite granophyre dikes that have crustal and meteoritic composition ( Koeberl et al., 1996...

... pegmatite from the Vredefort dome. South African Journal of Geology , 91 : 550 – 552 . Buchanan P.C. Reimold W.U. 2002 . Planar deformation features and impact glass in inclusions from the Vredefort Granophyre, South Africa. Meteoritics & Planetary Science , 37 ( 6 ): 807 – 822...

..., and planar deformation features in quartz, zircon and feldspar (see reviews in Reimold & Gibson, 1996 ; Gibson & Reimold, 2000 , 2001 ; Gibson et al. , 2001 ). In addition, the detection of a small meteoritic component in the Re-Os systematics of the Vredefort Granophyre ( Koeberl et al. , 1996...

... of quartz in nature and experiment: I. Basic observation and theory . Meteoritics and Planetary Science , 29 , 155 – 181 . Therriault A.M. Reimold W.U. Reid A.M. ( 1996 ) Field relations and petrography of the Vredefort Granophyre . South African Journal of Science , 99 , 1 – 21...

... locally-derived composition of pseudotachylitic melt (e.g. Mohr-Westheide et al., 2009 ; Harris et al., 2013 ; Reimold et al., 2017 ). Additionally, recent work has demonstrated that at least one generation of PT was formed prior to the emplacement of Vredefort Granophyre, thereby limiting...

... microdeformation, shatter cones, pseudotachylite veins and related breccias, as well as dykes of bronzite granophyre (referred to as the Vredefort Granophyre) deemed to be impact melt ( Gibson and Reimold, 2001 ; Reimold and Gibson, 2005 ; and references therein). The age of the impact event was dated by Kamo...

... at the Vredefort Dome, both of which have been interpreted to represent impact melts, including granophyre ( Kamo et al., 1996 ) and metanorite ( Moser, 1997 ; Cupelli and Moser, 2009 ). Given that granular texture zircon has only been reported from these two relatively minor rock types, it is remarkable...

... specific types of melt rock that are related to the impact event: pseudotachylitic breccia and the Vredefort impact melt rock known as “Vredefort Granophyre” ( Reimold and Gibson, 2006 ). The basement rocks and supracrustal strata were intruded by several phases of dioritic and alkali granitic magmas...