Cretaceous Environments of Asia by Hakuyu Okada and Nlall J. Mateer (Eds.)

By Hakuyu Okada and Nlall J. Mateer (Eds.)

This ebook offers a synthesis of the valuable environmental features of the Cretaceous in East and South Asia. The examine used to be complete less than IGCP venture 350, which offers with the organic, climatological and actual environments of this zone in the course of the Cretaceous. This synthesis discusses points of stratigraphy, sedimentology, paleontology, geochemistry, tectonics, petrology, mineralogy, and geophysics. The study effects are summarised through kingdom, and comprise some distance East Russia, Mongolia, japanese China, Korea, Japan, Philippines, Vietnam, Laos, Cambodia, Thailand, and India. even supposing those international locations don't surround the total area, this assurance offers an exceptional viewpoint of the evolution of the zone throughout the Cretaceous. The files integrated during this booklet current a wealth of marine and nonmarine information on weather, biotic range, movement and chemistry of the sea in addition to basic plume tectonism. The latter looks to have prompted a lot of the environmental switch during this huge quarter, together with either an more desirable greenhouse impression and excessive sea degrees.

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The Gomorechensky floral complex is dominated by Peculnea, Trochodendroides, Celastrinites, Renea, Dyrana, Platanus, Viburnum, Quereuxia, Palaeotrapa, and Corylus. The coniferous species are not abundant and represented by typical Late Cretaceous Sequoia minuta, Cryptomerites, and Taxites, and younger elements Metasequoia and Glyptostrobus. A role of the Ginkgo and cycadophytes (Nilssonia), which formed probably monodominant communities, is rather considerable in the flora. Ferns are represented by occasional occurrences of Osmunda.

The mid-latitude coal-bearing belt southern boundary lies approximately at 30┬░ N, but somewhat further south in eastern China. In East Russia coals are dominant with occurring kaolinites and bauxites in other parts of the belt [103]. During the early Neocomian the South Yakutiya, Udsk, Amur-Zeya and Bureya coal fields formed within the belt. In the Hauterivian-Barremian an intense coal accumulation also initiated in the Partizansk and Razdolnensky basins (Primorye). The Cretaceous is regarded as a non-glacial period.

Trochodendroides arctica, Platanus cf. heeri, Corylites protoinsignus, and Viburniphyllum asperum. The Senonian dominants among the conifers are still found in this complex, but Danian forms prevailed among the angiosperms. The palynocomplexes demonstrate the same relationships. 38 A boundary interval (Maastrichtian-Danian) of the Yurievsky floral complex in Sakhalin is absent [94]. At that time uplifting and volcanic activity commenced on the continental margin. To establish an iridium anomaly sampled representatives from plant-bearing beds at the Cretaceous/Danian boundary on the Yury island have been chosen for a geochemical analysis.

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