Yúnnán xībù ā lěng chū pōumiàn xià ní pén tǒng yá xíng lèi shēngwù dìcéng

0496852 - GLÚ 2019 RIV CN chi J - Článek v odborném periodiku
Wang, H.-h. - Ma, X.-p. - Slavík, Ladislav - Wei, F. - Zhang, M.-f. - Lü, D.
Yúnnán xībù ā lěng chū pōumiàn xià ní pén tǒng yá xíng lèi shēngwù dìcéng.
[Lower Devonian Conodont Biostratigraphy of the Alengchu Section in Western Yunnan Province, South China.]
Dicengxue Zazhi = Journal of stratigraphy. Roč. 42, č. 3 (2018), s. 288-300. ISSN 0253-4959
Institucionální podpora: RVO:67985831
Klíčová slova: biostratigraphy * conodont * Alengchu Fm. * Shanjiang Fm. * Baizitian Fm. * Lower Devonian * Silurian * South China
Obor OECD: Paleontology

Huánán dìqū zǎo ní pén shì zǎo—zhōngqí dì dìcéng zhōng hányǒu jiào duō de suì xiè yán, quēshǎo liánxù de huī yán pōumiàn jí yá xíng lèi huàshí, yīncǐ gāi dìqū luò hè kē fū jiē, bùlāgé jiē hé āi mǔ sī jiē de dǐ jiè jūn wèi néng yǐ yá xíng lèi quèlì. Diān xī ā lěng chū pōumiàn hǎi xiàng tàn suān yán yán fāyù, jùbèi jiào hǎo de yá xíng lèi shēngwù dìcéng yánjiū tiáojiàn. Tōngguò duì gāi pōumiàn yá xíng lèi de yánjiū, quèdìngle zhì liú xì-ní pén xì de dàzhì jièxiàn, luò hè kē fū jiē -bùlāgé jiē de jièxiàn hé bùlāgé jiē-āi mǔ sī jiē de jièxiàn, bìng duì pōumiàn zhì liú xì dì dìcéng jìnxíngle chūbù de huàfēn. Gēnjù xiàn yǒu de yá xíng lèi yánjiū jiāng luò hè kē fū jiē huàfēn wéi xià, zhōng, shàng sān bùfèn, bùlāgé jiē de dǐ jiè yǐ Latericriodus steinachensis eta morphotype hé Pseudogondwania ethingtoni de shǒucì chūxiàn wèi biāozhì, zì xià ér shàng shìbié chūle irregularis dài hé kindlei-pireneae dài, zài huánán dìqū shǒucì fāxiànle āi mǔ sī jiē dǐ jiè de biāozhì fēnzǐ Eocostapolygnathus kitabicus. Jù cǐ, rènwéi shānjiāng zǔ xiàbù de shídài shǔyú luò hè kē fū qī, zhōng shàngbù shǔyú bùlāgé qī, ā lěng chū zǔ de shídài wéi āi mǔ sī qī, lóngmǎ xī zǔ shàngbù kěnéng zhǔ wén luòkè tǒng, bài zǐ tián zǔ zé wèi wén luòkè tǒng jí yǐshàng dì dìcéng.

Due to the lack of continuous lower to middle Lower Devonian limestone successions, the bases of the Lochkovian, Pragian and Emsian in South China have not been defined in terms of conodont biostratigraphy. The Alengchu section in western Yunnan currently represents one of the most continuous Lochkovian to Lower Emsian limestone sequences in South China that is suitable for conodont biostratigraphic work. In this study, we have roughly defined the bases of the Lochkovian, Pragian and Emsian, and made a preliminary division of the Silurian. The Lochkovian has been divided into lower, middle and upper parts. In the Pragian the irregularis Zone is based on Pseudogondwania ethingtoni and Latericriodus steinachensis eta morphotype. The succeeding kindlei-pireneae Zone is delimited herein indirectly based on E. trilinearis and Gondwania nevadensis alpha as reference markers. Eocostapolygnathus kitabicus is reported here for the first time in South China. Study of conodont distributions shows that the lower part of the Shanjiang Formation. is Lochkovian in age, its middle and upper parts are Pragian in age, the Alengchu Formation. is earliest Emsian in age. The age of the upper Longmaxi Formation. is probably Wenlock, whereas the Baizitian Formation. corresponds to an interval from the Wenlock through the rest of the Silurian.

Due to the lack of continuous lower to middle Lower Devonian limestone successions, the bases of the Lochkovian, Pragian and Emsian in South China have not been defined in terms of conodont biostratigraphy. The Alengchu section in western Yunnan currently represents one of the most continuous Lochkovian to Lower Emsian limestone sequences in South China that is suitable for conodont biostratigraphic work. In this study, we have roughly defined the bases of the Lochkovian, Pragian and Emsian, and made a preliminary division of the Silurian. The Lochkovian has been divided into lower, middle and upper parts. In the Pragian the irregularis Zone is based on Pseudogondwania ethingtoni and Latericriodus steinachensis eta morphotype. The succeeding kindlei-pireneae Zone is delimited herein indirectly based on E. trilinearis and Gondwania nevadensis alpha as reference markers. Eocostapolygnathus kitabicus is reported here for the first time in South China. Study of conodont distributions shows that the lower part of the Shanjiang Formation. is Lochkovian in age, its middle and upper parts are Pragian in age, the Alengchu Formation. is earliest Emsian in age. The age of the upper Longmaxi Formation. is probably Wenlock, whereas the Baizitian Formation. corresponds to an interval from the Wenlock through the rest of the Silurian.
Trvalý link: http://hdl.handle.net/11104/0291578