Titlebook: Siliceous Deposits of the Tethys and Pacific Regions; James R. Hein,Jelena Obradović (Faculty of Mining Conference proceedings 1989 Sprin

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Length-Slow Chalcedony in Sedimentary Rocks of the Mesozoic Allochthonous Terrane in Central Japan acedony formed in evaporitic environments. Recent geologic, paleomagnetic, and paleontologic syntheses of the tectonic evolution of the Japanese Islands have revealed the allochthonous nature of the Mino Terrane. I suggest that length-slow chalcedony can be used as a tracer mineral to identify the pr

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Thermal Alteration of Chert in the Ophiolite Basement of Southern Central Americalages with scapolite were found close to igneous contacts and indicate medium to high grade metamorphism. Secondary minerals in veins with dominantly barite and zeolites commonly formed under low temperature conditions of less than 150°C. These different petrologic changes are discussed as to their

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Radiolarian Evidence: Late Cretaceous Through Eocene Ocean Circulation Patternsns today indicate normal saline, oceanic conditions, so their presence in the fossil record documents seaways analogous to areas of present-day radiolarian deposition. The circulation patterns indicated by radiolarian distributions support and slightly modify previous paleoceanographic models. Durin

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Radiolarians, Radiolarites, and Mesozoic Paleogeography of the Circum-Mediterranean Alpine Beltsble to date radiolarites and many age dates are scattered through the specialized geologic literature. The inventory of available data from the Mesozoic of the circum-Mediterranean Alpine fold belts reveals two general periods of radiolarite sedimentation, both associated with sedimentary and ophiol

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Distribution and Evolution of Siliceous Rocks in Bulgariaite, spongolite, radiolarite, siliceous shale, jasper, silicified limestone, nodular chert, chert pebbles, and chalcedony sand. The mineral composition is also variable including quartz, chalcedony, cristobalite, opal-CT, and opal-A. The siliceous rocks are polygenetic. Their evolution is governed b

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