浙西北上奥陶统文昌组和堰口组沉积特征及其意义<sup>*</sup>

doi:10.7605/gdlxb.2012.01.009

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Abstract Based on new collections of fossils from the Upper Ordovician Wenchang，Yankou and Anji Formations in northwestern Zhejiang Province，southeastern China，especially those significant graptolites，the Wenchang Formation is considered to be equivalent to the Yankou Formation，and is largely of Hirnantian Age.In Hirnantian Age，the Gondwana ice sheet，centered in the North Africa，reached its maximum，as evidenced by that more and more glacial deposits(tillites or diamictites)of the age have been reported across the world.The Wenchang and Yankou Formations yield well-developed conglomerates，which are unique in South China and might be related with the glaciation event.Regarding the origination of the conglomerates，there have been some debates and viewpoints from different perspectives.Based on sedimentary studies，these conglomerates display different sedimentary characters and mechanisms among localities and sections in the region.They represent several types of channel depositions in shallow water.A detailed regional lithofacies study of the Wenchang and Yankou Formations in northwestern Zhejiang Province indicates that a Zhe-Wan Basin was developed in the Hirnantian Age，with Cathaysian Land located to its southeast and served as the clastic source.The basin becomes deeper northwestwardly，following the palaeogeographic pattern of pre-Hirnantian.Petrological analysis of the sandstones in the Wenchang and Yankou Formations displays a low compositional maturity along with a low textural maturity，and a provenance of recycled orogenic belt，which indicate a probable sustaining uplift of the Cathaysian Land.The regressional sequence recognized in the Wenchang and Yankou Formations in northwestern Zhejiang Province can be well correlated with that of other continents or regions，such as North Africa，Middle East，U.K.，Sweden and Czech etc.

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	Liu Xiao
	Zhang Yuandong
	Zhou Chuanming

Key words： conglomerate glaciation Wenchang Formation Yankou Formation Hirnantian Age Ordovician northwestern Zhejiang Province

Received: 03 August 2011 Published: 01 February 2012

ZTFLH:

P534.42

About author: Liu Xiao，born in 1982，graduated from Nanjing Institute of Geology and Palaeontology，Chinese Academy of Sciences，majors in sedimentology and stratigraphy.E-mail:liuxsucf@yahoo.com.cn.

Cite this article:

Liu Xiao,Zhang Yuandong,Zhou Chuanming. Sedimentary characteristics of the Upper Ordovician Wenchang and Yankou Formations in northwestern Zhejiang Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(1): 101-116.

Liu Xiao,Zhang Yuandong,Zhou Chuanming. Sedimentary characteristics of the Upper Ordovician Wenchang and Yankou Formations in northwestern Zhejiang Province[J]. JOPC, 2012, 14(1): 101-116.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2012.01.009 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2012/V14/I1/101

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