| 青海南部二叠纪类生物古地理区系 |
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| 引用本文： | 牛志军,吴俊.青海南部二叠纪类生物古地理区系[J].地球科学,2015,40(2):346-356. |
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| 作者姓名： | 牛志军 吴俊 |
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| 作者单位： | 武汉地质矿产研究所,湖北武汉430223 |
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| 基金项目： | 国家自然科学基金(No.40972006)国土资源部“百名优秀青年科技人才计划”(2008)中国地质调查局项目(Nos.1212010911035, 200213000003) |
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| 摘 要： | 冈瓦纳与欧亚大陆间的昌都地块构造属性存在争议,解决问题的关键是生物古地理区系判别.青海南部二叠纪类化
石群的研究表明昌都地块该生物群一直表现为暖水的特提斯型,与华南地区始终表现出更多的相似性,其生物古地理归属应
为特提斯大区华夏-特提斯区华南亚区.昌都地块南界龙木错-双湖-澜沧江缝合带在早二叠世为划分青藏高原暖水型特提
斯区的南界,不仅是华南亚区与藏北冷暖混合亚区的分界线,也是特提斯大区与冈瓦纳大区的分界线.中二叠世以后该带不再
构成大区界线,但在确定次一级分区界线上仍是一个很好的划分标志;北界金沙江缝合带二叠纪两侧生物群表现出一致性,
未形成浅海底栖生物自由迁移的障碍,不具有生物古地理分区意义.
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| 关 键 词： | 昌都地块 二叠纪 类 古生物地理 地理分布 地层学 |
Palaeobiogeography of Permian Fusulinid in Southern Qinghai |
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| Niu Zhijun,Wu Jun.Palaeobiogeography of Permian Fusulinid in Southern Qinghai[J].Earth Science-Journal of China University of Geosciences,2015,40(2):346-356. |
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| Authors: | Niu Zhijun Wu Jun |
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| Abstract: | The tectonic affiliation of Qamdo B1ock between the Gondwana and Eurasia remains controversia1, which involves
mainly the determination of the northern boundary of Gondwana and the palaeobiogeography of Qamdo B1ock. Fusulinid fauna,
a kind of benthiclife, is applied to the palaeobiogeography study in this paper. Based on abundant of fusulinid fossils from Early
Permian Schwagerma cushman1 fauna to Late Permian Paiaeofusuiina slnensls fauna in volcano-sedimentary sequences from
southern Qinghai, it is proposed these fusulinid faunas have always been the warm-water Tethyan type, showing more similari-
ty with the counterpart from South China, and has not beenlinked to the fauna from the Gondwana. The fusulinids from the
Qamdo B1ock should be1ong to the South China Subprovince, Cathaysian-Tethyan Province, Tethyan Realm in palaeobiogeo-
graphic affiliation. The Lungmu Co-Shuanghu-Lantsangjiang Suture Zone in the Early Permian is proposed as the southern
boundary of the Cathaysian-Tethyan Province(warm-water type) in the Tibetan Plateau(or the boundary of South China Sub-
province and the northern Tibet Subprovince characterized by a mixed warm and cold biota). This suture zone is the division be-
tweenTethyanand Gondwana Realms which was changed in the Middle and Late Permian and can not be regarded as the
boundary of Realms, although a minor difference between the fusulinid faunas from two areas separated by the suture zone sti11
existed.Furthermore, the similarity of the faunas from both sides of Jinshajiang Suture Zone shows the zone is not the barrier
zone which prevented the migration of benthic biota and can not be regarded as the boundary of palaeobiogeographic provinces. |
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| Keywords: | Qamdo Block Permian fusulinid palaeobiogeography geographical distribution stratigraphy |
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