AN ELECTRON MICROSCOPE STUDY OF THE SURFACE TEXTURE OF SAND GRAINS FROM A BASAL CONGLOMERATE

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SUMMARY

Quartz grain surface textures from the basal glauconitic chalk of the Belemnitella mucronata Zone southwest of Belfast, Northern Ireland, show the effects of solution during the last stages of diagenesis of the limestone. The postulated chemical environment, in which quartz is more soluble than calcite, is one of moderate temperature and pressure and alkaline circulating ground water.

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