Devonian to Triassic successions of the Changning-Menglian Belt, western;Yunnan, China

	Devonian to Triassic successions of the Changning-Menglian Belt, western;Yunnan, China
	Jin, XC; Wang, YZ; Xie, GL
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2003
卷号	77 期号:4 页码:440-456
关键词	stratigraphy Devonian carboniferous permian Triassic Changning-Menghan Belt western Yunnan
ISSN号	1000-9515
英文摘要	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 limestone lenses in the mid-section, changing up-section into alternations of fine clastics and cherts; (2) clastics with chert intercalations and limestone lenses, and topped by Permian basic volcanics; (3) clastics-basic volcanics-carbonates-elastics; and (4) limestones, dolomitic limestones-lark gray thin-bedded limestones, argillaceous limestones, mudstones and siliceous mudstones. Devonian to Triassic cherts occur in different horizons and different zones from east to west. These cherts are usually transitional to their neighboring clastics. There is no continuous Devonian 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 to have formed in a marine environment on continental crust. Succession (4) is newly recognized in the area from Menglai to Yong'an in Cangyuan County and further north to Padi of Gengma County. Basalts, cherts and clastics also appear in this area. Mid-Triassic (very probably Ladinian) radiolarians extracted from bedded cherts in the Ganzhejidi section indicate that they are in higher stratigraphic positions. The change from bedded cherts via siltstones to thick-bedded sandstones with thin-bedded fine intercalations in the Ganzhejidi section and (some other outcrops along the road from Cangyuan to Gengma) suggests a fundamental change of sedimentary environment caused by a rapid increase of a large quantity of detritus supply. These siliciclastic sediments are possibly syn-orogenic deposits.
学科主题	地层学与地史学
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000188701400004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37591]
专题	中国地质科学院地质研究所
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Jin, XC,Wang, YZ,Xie, GL. Devonian to Triassic successions of the Changning-Menglian Belt, western;Yunnan, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2003,77(4):440-456.
APA	Jin, XC,Wang, YZ,&Xie, GL.(2003).Devonian to Triassic successions of the Changning-Menglian Belt, western;Yunnan, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,77(4),440-456.
MLA	Jin, XC,et al."Devonian to Triassic successions of the Changning-Menglian Belt, western;Yunnan, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 77.4(2003):440-456.