| 新疆晚奥陶世床板珊瑚、日射珊瑚及其生物地层学意义 |
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| 引用本文： | 王宝瑜.新疆晚奥陶世床板珊瑚、日射珊瑚及其生物地层学意义[J].新疆地质,1990(1). |
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| 作者姓名： | 王宝瑜 |
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| 作者单位： | 新疆维吾尔自治区地质矿产局地质矿产研究所 |
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| 摘 要： | 新疆晚奥世床板珊瑚、日射珊瑚化石现已发现44属.152种.本文建立了三个床板珊瑚组合(Catenipora-Eofletcheria组合,Agetolites-Rhabdotetradium组合,Procatenipora-Para-tetradium组合)和二个日射珊瑚组合(Fuyunolites组合,Plasmoporella组合).根据珊瑚的分布规律,推测晚奥陶世新疆存在环准噶尔海和环塔里木海两个海区,并推测现北纬20°—80°为当时热带和亚热带气候区,古赤道位于现北纬50°位置.新疆当时处于赤道以南热带和亚热带范围,致使床板珊瑚、日射珊瑚空前繁盛.
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| 关 键 词： | 床板珊瑚 日射珊瑚 组合特征 生物地层学意义 晚奥陶世 新疆 |
THE LATE ORDOVICIAN TABULATA AND HELIOLITIDEA IN XINJIANG AND THEIR BIOSTRATIGRAPHICAL SIGNIFICANCE |
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| Wang Baoyu.THE LATE ORDOVICIAN TABULATA AND HELIOLITIDEA IN XINJIANG AND THEIR BIOSTRATIGRAPHICAL SIGNIFICANCE[J].Xinjiang Geology,1990(1). |
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| Authors: | Wang Baoyu |
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| Abstract: | The tabulata and heliolitidea of the late Ordovician in Xinjiang are widely di-stributed. At present, 44 genera, 152 species have been discovered or described. Some of them have become the important basis for the subdivision and correlation-of the late Ordovician rocks. They ,are collected from Altai , West Junggar, East Junggar, North Tianshan, Kuruktag, Altun etc.
In the paper, the three tabulata assemblages of late Ordovician in Xinjiang have been determined. They are as follows:
Lower part of late Ordovician: Catenipora-Eofletcheria assemblage, containing, Catenipora, Eofletcheria, Rhabdotetradium, etc.,obtained in Keziletesikela Formation and Aketashi Fm.
Middle-upper part of late Ordovician: Agetolites-Rhabdotetradium assemblage,yielding Agetolites, Hemiagetolites, Agetolitella, Hemiagetolitella,Palaeofavosites, Mesofa-vosites, Mesosolenia, Catenipora, Nyctopora, Saffordophyllum, Lyoppra, Eofletcheria, Eofletcheriella, Reuschia, Rhabdotetradium, Paratetradium, etc., occurring in Baihaba Fm, Bulongguoer Fm, Jianbosar Fm, Huduketaban Fm, Wuligezitag Fm and the Upper Ordovician of Altun.
Upper part of late Ordovician: Procatenipora-Paratetradium assemblage, bearing Procatenipora, Paratetradium, only occurring from Basitawukuduke Fm.
The author has also set up two heliolitidea assemblages of late Ordovician ire above mentioned regions:
Lower part of late Ordoviciani Fuyunolites assemblage,obtained in Keziletesikela Fm. It consists of only Fuyunolites.
Middle-upper part: Plasmoporella assemblage, comprising Acdalopora, Concavi-tes, Cosmiolites, Dilites, Diploepora, Heliolites, Khadzhingia, Karagemia. Khangailites, Cytophyllum, Plasmoporella, Neoplasmoporella, Protrochiscolithus, Proheliolites,Propora, Taeniolites, Protaraea, Wormsipora, Neowormsipora, Stelliporella Parastelliporella, Sy-ringoheliolites, Sinolites, Sibiriolites, Neosibiriolites, etc. It usually appears together with Agetolites-Rhabdotetradium. assemblage.
On the basis of the distributive law of the late Ordovician tabulata and heliolitidea in Xinjiang, the author infers that there are two seas of late Ordovician in Xinjiang, i.e. Circum-Junggar sea and Circum-Tarim sea. They are situated at the surrounding regions of the Junggar land and Tarim land, and communicated with each other. Each of them communicated with it's neighbour seas areas such as; Cansu, Qinghai, Nei Mongol, Sichuan, Zhejiang-Jiangxi, Yunnan-Guizhou and USSR (Altai, Kazakhstan, Siberia, Middle Asia, Ural etc. ), West Europe, North
America, as well ;as Australia.For this reason,the tahulata and heliolitidea in late
Ordovician all over the world were similar.
In addition, based on the distribution trend of late Ordovician tabulata and he-liolitidea in the world, the author also infers that the present area of north latitude 20-80 is analogous to the tropical and subtropical zones of late Ordovician period. At that time, the equator was situated in the present north latitude 50. The Xinjiang area was located at that time tropical and subtropical zones. That's why the tabulata and heliolitidea of late Ordovician are widely developed in Xinjiang. |
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| Keywords: | Tabulata Heliolitidea Biostratigraphy Late Ordovician Xinjiang |
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