NDLI: Samples from Core Lbo 8 a : First Material Recovered from the Central Uplift of the Bosumtwi Impact Crater , Ghana

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Samples from Core Lbo 8 a : First Material Recovered from the Central Uplift of the Bosumtwi Impact Crater , Ghana

Content Provider	Semantic Scholar
Author	Ferrière, Ludovic Koeberl, Christian Uwe, Wiechert Reimold
Copyright Year	2006
Abstract	Borehole LB-08A was drilled into the crater fill and underlying bedrock of the Bosumtwi impact structure, on the outer flank of the central uplift. Here we present mineralogical observations and shock petrography of drillcore LB-O8A. We find that suevites from this core show a lower proportion of melt particles and diaplectic quartz glass than suevites from outside the northern crater rim. Some PDFs in quartz grains are strongly decorated and the amount of shock deformation of the metasediment (bedrock) decreases with depth (also a shock heterogeneity related to different lithologies). Introduction: The 1.07 Ma old Bosumtwi impact structure, centered at 0630 ́N and 0125 ́W, with a rim-to-rim diameter of 10.5 km, is a well-preserved complex impact crater with a pronounced rim and small central uplift [1-2]. The crater is almost entirely filled by a lake. The LB-O8A borehole, recovered between 235.6 and 451.33 m depth, was drilled as part of the 2004 International Continental Scientific Drilling Program (ICDP) [3]. This drillcore consists of approximately 25 meters of typical suevite (suevite definition according to [4], Fig. 1) overlying fractured/brecciated metasediment that displays a large variation in lithology and grain size (fine-grained to gritty). The metasediment is intercalated locally with suevite or granitoid dikes (see [5] for details). For this study we examined more than 150 thin sections representing 20 suevite and 100 metasediment samples and selected some of them for additional investigations (e.g., universal stage measurements, point-counting, SEM study).
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Alternate Webpage(s)	http://www.meteorimpactonearth.com/PDF%20files/Abs07_Ferriere%20et%20al_Lockne%20conf_2006_Shock%20metamorphism-Core%20LB-08A.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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