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- W85930380 abstract "Phanerozoic strata are distributed in several north-south trending zones in the central part of the Changning-Menglian Belt. Four types of Devonian to Triassic stratigraphic successions can be identified: (1) clastics with limestonelenses in the mid-section, changing up-section into alternations of fine clastics and cherts; (2) clastics with chertintercalations and limestone lenses, and topped by Permian basic volcanics; (3) clastics-basicvolcanics-carbonates-clastics; and (4) limestones, dolomitic limestones-dark gray thin-bedded limestones, argillaceouslimestones, mudstones and siliceous mudstones. Devonian to Triassic cherts occur in different horizons and differentzones from east to west. These cherts are usually transitional to their neighboring clastics. There is no continuousDevonian to Middle Triassic chert sequence in the central zone of the Changning-Menglian Belt as Liu et al. (1991, 1993)reported. Volcanics and the overlying carbonates described by some workers as seamount sequences are more likely tohave formed in a marine environment on continental crust. Succession (4) is newly recognized in the area from Menglai toYong'an in Cangyuan County and further north to Padi of Gengma County. Basalts, cherts and clastics also appear in thisarea. Mid-Triassic (very probably Ladinian) radiolarians extracted from bedded cherts in the Ganzhejidi section indicatethat they are in higher stratigraphic positions. The change from bedded cherts via siltstones to thick-bedded sandstoneswith thin-bedded fine intercalations in the Ganzhejidi section and (some other outcrops along the road from Cangyuan toGengma) suggests a fundamental change of sedimentary environment caused by a rapid increase of a large quantity ofdetritus supply. These siliciclastic sediments are possibly syn-orogenic deposits." @default.
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- W85930380 date "2003-01-01" @default.
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- W85930380 title "Devonian to Triassic Successions of the Changning-Menglian Belt, Western Yunnan, China" @default.
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