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The 4-km-wide and 0.5-km-deep Kärdla Crater, presently buried under a thin sequence of Upper Ordovician limestone, was formed in a complex target: the crystalline basement was covered by about 170 m of poorly consolidated Lower to Middle Ordovician and Cambrian sediments. The basement-derived granitoids and amphibolites that were subjected to low shock pressure (less than 8 GPa) and are at present...
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