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Contacts, collisions, sutures, belts, and margins -- new GSA Bulletin content
Date:4/9/2013

of crustal recycling in the construction of the modern day Andean margin. The lithological character of the xenoliths and their detrital zircon ages are inconsistent with current understanding of the eastern extent of the Arequipa-Antofalla Basement block beneath the Bolivian Altiplano and instead indicate that it terminates farther to the west than previously assumed.


Crustal fracturing and chert dike formation triggered by large meteorite impacts, ca. 3.260 Ga, Barberton greenstone belt, South Africa
Donald R. Lowe, Dept. of Geological and Environmental Sciences, 118 Braun Hall, Stanford University, Stanford, California 94305-2115, USA. Posted online 7 March 2013; http://dx.doi.org/10.1130/B30782.1.

The approx. 3260 million-year-old contact between the largely volcanic Onverwacht Group and overlying largely sedimentary Fig Tree Group in the Barberton greenstone belt, South Africa, is widely marked by chert dikes that extend downward for up to 100 m into underlying sedimentary and volcanic rocks of the Mendon Formation (Onverwacht Group). In the Barite Valley area, these dikes formed as open fractures that were filled by both precipitative fill and the downward flowage of liquefied carbonaceous sediments and ash at the top of the Mendon Formation. Spherules that formed during a large meteorite or asteroid impact event occur in a wave- and/or current-deposited unit, spherule bed S2, which widely marks the Onverwacht-Fig Tree contact, and as loose grains and masses within some chert dikes up to 50 m below the contact. Four main types of chert dikes and veins are recognized: (Type 1) irregular dikes up to 8 m wide that extend downward across as much as 100 m of stratigraphy; (Type 2) small vertical dikes, most less than one m wide, which are restricted to the lower half of the Mendon chert section; (Type 3) small crosscutting veins, most less than 50 cm across, filled
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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