Study of the Radiolarian Fauna from Kaduo in Zedang of Southern Tibet and the Geological Significance

doi:10.19657/j.geoscience.1000-8527.2019.03.10

Abstract

Abstract:

The Yarlung-Zangbo Ophiolite Zone has long been considered as the lithospheric residual of Neo-Tethys, jointly with the marine stratum within the Yarlung-Zangbo Suture Zone, recorded the evolution of the Neo-Tethys and the collision between India Plate and Eurasian Plate. Moderate preserved Mesozoic radiolarian fossils have been found from the Kaduo Chert, near the southwest of the Zedang of southern Tibet. And 39 radiolarian species belonging to 31 genera have been identified preliminary. Four radiolarian assemblages have been recognized as follows in ascending: Alievium longispineum-Transhsuum maxwelli assemblages (Late Bathonian-Early Callovian), Hsuum maxwelli-Triactoma mexicana assemblages (Late Callovian-Oxfordian), Holocryptocapsa hindei-Hiscocapsa grutterinki assemblages (Late Barremian-Early Aptian) and Hemicryptocapsa polyhedra-Obeliscoites giganteus assemblages (Late Albian-Cenomanian). The radiolarian assemblages in the Kaduo chert can provide an important micropaleontological evidence for the formation time constrain on the Zedang ophiolite and the evolution of the Neo-Tethys Ocean.

Key words: Yarlung-Zangbo suture, ophiolite, chert, radiolarian, Mesozoic

CLC Number:

P539

MA Xuesong, LI Guobiao. Study of the Radiolarian Fauna from Kaduo in Zedang of Southern Tibet and the Geological Significance[J]. Geoscience, 2019, 33(03): 574-586.

Figures/Tables 7

References 45

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属种名称	样品编号				分布时限
属种名称	KD-5	KD-7	KD-14	KD-29	分布时限
Acaeniotyle aff. longispina			R	C	阿普特期—早土仑期
Acaeniotyle umbilicata			A	R	晚巴柔期—晚坎潘期
Alievium longispineum		A			巴通期—卡洛夫期
Archaeocenosphaera (?) sp.			R		安尼期—坎潘期
Canoptum poissoni		C			晚三叠世—早卡洛夫期
Cinguloturris carpatica	R	C			晚巴通期—早凡兰吟期
Cryptamphorella sp.			R		早提塘期—晚马斯特里赫特期
Dantze rutogensis		R			早普林斯巴期—早牛津期
Distylocapsa squama				C	中阿尔布期—晚土仑期
Dorypyle ? anisa				R	中阿尔布期—晚赛诺曼期
Emiluvia chica	C	R			早辛涅缪尔期—晚凡兰吟期
Emiluvia sp.	R				早辛涅缪尔期—晚凡兰吟期
Gongylothorax verbeeki				C	晚巴通期—马斯特里赫特期
Hemicryptocapsa polyhedra				A	欧特里夫期—土仑期
Hiscocapsa grutterinki			A		晚巴通期—中阿尔布期
Holocryptocanium barbui				A	阿尔布期—早土仑期
Holocryptocanium geyserensis				A	阿尔布期—晚赛诺曼期
Holocryptocapsa fallax			R		晚凡兰吟期—中阿普特期
Holocryptocapsa hindei			R		晚凡兰吟期—中阿普特期
Hsuum maxwelli	C				巴通期—钦莫利期
Obeliscoites giganteus				A	晚欧特里夫期—晚赛诺曼期
Olanda olorina			C		早巴柔期—中阿尔布期
Praeconocaryomma sp.	R				早侏罗世—坎潘期
Pseudoaulophacus venadoensis				C	晚阿尔布期—土仑期
Pseudodictyomitra sp.		R			早巴通期—土仑期
Pseudoeucyrtis hanni			C		巴雷姆期—阿普特期
Thanarla brouweri			A	R	早贝里阿斯期—早土仑期
Transhsuum maxwelli	R	A			巴柔期—中钦莫利期
Triactoma mexicana	A	R			卡洛夫期—早提塘期

属种名称	样品编号				分布时限
属种名称	KD-5	KD-7	KD-14	KD-29	分布时限
Acaeniotyle aff. longispina			R	C	阿普特期—早土仑期
Acaeniotyle umbilicata			A	R	晚巴柔期—晚坎潘期
Alievium longispineum		A			巴通期—卡洛夫期
Archaeocenosphaera (?) sp.			R		安尼期—坎潘期
Canoptum poissoni		C			晚三叠世—早卡洛夫期
Cinguloturris carpatica	R	C			晚巴通期—早凡兰吟期
Cryptamphorella sp.			R		早提塘期—晚马斯特里赫特期
Dantze rutogensis		R			早普林斯巴期—早牛津期
Distylocapsa squama				C	中阿尔布期—晚土仑期
Dorypyle ? anisa				R	中阿尔布期—晚赛诺曼期
Emiluvia chica	C	R			早辛涅缪尔期—晚凡兰吟期
Emiluvia sp.	R				早辛涅缪尔期—晚凡兰吟期
Gongylothorax verbeeki				C	晚巴通期—马斯特里赫特期
Hemicryptocapsa polyhedra				A	欧特里夫期—土仑期
Hiscocapsa grutterinki			A		晚巴通期—中阿尔布期
Holocryptocanium barbui				A	阿尔布期—早土仑期
Holocryptocanium geyserensis				A	阿尔布期—晚赛诺曼期
Holocryptocapsa fallax			R		晚凡兰吟期—中阿普特期
Holocryptocapsa hindei			R		晚凡兰吟期—中阿普特期
Hsuum maxwelli	C				巴通期—钦莫利期
Obeliscoites giganteus				A	晚欧特里夫期—晚赛诺曼期
Olanda olorina			C		早巴柔期—中阿尔布期
Praeconocaryomma sp.	R				早侏罗世—坎潘期
Pseudoaulophacus venadoensis				C	晚阿尔布期—土仑期
Pseudodictyomitra sp.		R			早巴通期—土仑期
Pseudoeucyrtis hanni			C		巴雷姆期—阿普特期
Thanarla brouweri			A	R	早贝里阿斯期—早土仑期
Transhsuum maxwelli	R	A			巴柔期—中钦莫利期
Triactoma mexicana	A	R			卡洛夫期—早提塘期