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地质科学  1998, Vol. Issue (3): 282-289    DOI:
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浙西上奥陶统于潜组Spirodesmos遗迹化石组合的环境意义
晋慧娟, 李育慈
中国科学院兰州地质研究所 兰州 730000
ENVIROMENTAL SIGNIFICANCE OF A Spirodesmos ICHNOFOSSIL ASSEMBLAGE FROM UPPER ORDOVICIAN YUQIAN FORMATION IN THE WESTERN ZHEJIANG PROVINCE, CHINA
Jin Huijuan, Li Yuci
Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000
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摘要 在概述了浙江西部上奥陶统于潜组的沉积学特征,并进而描述了发现的14个遗迹化石属基础上,从4个方面对Spirodesmos为代表的遗迹组合进行了环境分析:(1)14个遗迹属中仅3个属为穿相型分子,其余占遗迹总属2/3以上的遗迹化石均为典型的深水型分子,它们都是Nereites遗迹相的主要成员,因此该遗迹组合可归属于深海Nereites遗迹相中;(2)大部分遗迹化石呈复杂规则弯曲的形态,这种形态的遗迹化石是深海环境的遗迹化石标志;(3)14个遗迹属均为觅食迹和牧食迹,它们的行为习性,尤其是牧食迹主要分布于深海环境;(4)多数遗迹属的水深分布均在200m以下。由此可认为Spirodesmos遗迹组合是半深海-深海环境的产物。
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晋慧娟
李育慈
关键词Spirodesmos遗迹组合   环境意义   上奥陶统于潜组   浙江省西部     
Abstract: The Upper Ordovician Yuqian Formation, a rhythmic unit composed of silty to fine sandstones and mudstones with different thickness, is widely developed in the aera from Lingan to Jiande in western Zhejiang Province. The thick terrigenous clastic rock series clearly characterizes turbidity deposits in which lenticular or wavy beddings occasionly occour. On the Te surface or under the Ta bottom surface of the Bouma sequence,abyssal ichnofossils of Nereites ichnofacies appear. Graptolites shales are commonly intercalated in the Te member. Based on the facts above, the formation is considered as a flysch facies. Fourteen ichnospecies were found in the facies. They are Chondrites, Granularia, Helminthoida, Helminthopsis, Megagrapton, Paleodictyon, Paleomeandron, Planolites, Protopaleodictyon, Spirodesmos, Subphyllochorda, Subularia, Tuberculichnus and Urohelminthoida. The Spirodesmos ichnogenuses are abundant in the ichnocoehose, so the ichnofossil assemblage can be named a Spirodesmos one. Besides, because the ichnofossils above are usual in the Nereites ichnofacies, the Spirodesmos assemblage can be included in it. The enviroment of the assemblage is investigated in terms of the following four aspects: 1. A Nereites ichnofacies is generally thought as a common ichnofacies in a bathyal to abyssal area where turbidity currents can flow. 2. Fourteen ichnofossils are predominant in winding, meandering and network shapes, which characterizes shapes of abyssal ichnofossils. 3. Fourteen ichnofossils are superior in ethology of Fodichnia, especilly Pasichnia which are common in a abyssal environment. 4. According to water depths at which the ichnofossils were formed, the fourteen ichnogenuses were mainly generated at the depths less than 200m below sea level. In light of the analysis above, it can be concluded that the Spirodesmos assemblage is an abyssal indicator.
Key wordsSpirodesmos ichnofossil assemblage   Environmental significiance   Upper Ordovician Yuqian Formation   Western Zhejiang Province   
收稿日期: 1997-05-19;
基金资助:国家自然科学基金
引用本文:   
晋慧娟,李育慈. 1998, 浙西上奥陶统于潜组Spirodesmos遗迹化石组合的环境意义. 地质科学, (3): 282-289.
Jin Huijuan,Li Yuci. ENVIROMENTAL SIGNIFICANCE OF A Spirodesmos ICHNOFOSSIL ASSEMBLAGE FROM UPPER ORDOVICIAN YUQIAN FORMATION IN THE WESTERN ZHEJIANG PROVINCE, CHINA[J]. Chinese Journal of Geology, 1998, (3): 282-289.
 
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[1] 张沛全, 刘小汉, 孔屏. 雅鲁藏布江大拐弯地区末次冰期以来的冰川活动证据及其构造—环境意义[J]. 地质科学, 2008, (3): 588-602.
[2] 晋慧娟, 李育慈. 西秦岭二叠纪-三叠纪遗迹化石及其环境意义[J]. 地质科学, 1995, (4): 321-328.
 
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