Sea-Level Fluctuations in the Tremadocian of the Ordovician in the Upper Yangtze Region of South China

doi:10.13209/j.0479-8023.2016.123

Abstract

Abstract:

Four Tremadocianian sections of the Upper Yangtze Region of South China are intensively studied for biostratigraphical division and correlation. Based on the analysis of lithofacies, lithofacies associations, and facies successions, the detailed sea level curves of Tremadocian are revealed. Ten lithofacies which are grouped into three lithofacies associations deposited in the shallow subtidal, deep subtidal and shale basin zones. At least five major transgression events are recognized from each section in early TS.1a, late TS.1a, early TS.1c, late TS.1c and late TS.1d. The most major transgression event occurred in early TS.1c. Compared with other paleoplates, eustatic sea level changes might be the major controlling factor for the sea level fluctuations of the Upper Yangtze Region of South China.

Key words: Tremadocian, Upper Yangtze Region, sea level changes

摘要：

在较为精细的生物地层学研究基础上, 对位于华南上扬子区 4 条剖面的沉积相组合以及沉积相序列进行分析, 建立上扬子区特马豆克期高分辨率相对海平面变化曲线。识别出 10 个沉积相, 划分出 3 个沉积相组合, 分别沉积于浅潮下带、深潮下带和页岩盆地带; 识别出 5 次重要的海侵事件, 分别发生在 TS.1a 早期、TS.1a 晚期、TS.1c 早期、TS.1c 晚期和TS.1d 晚期, 其中 TS.1c 早期的海侵为特马豆克期最大海侵事件。通过与其他板块海平面变化曲线的对比, 发现上扬子区海平面变化主要受全球海平面变化的控制。

关键词: 特马豆克, 上扬子区, 海平面变化

CLC Number:

P539

Yongchao SUN, Jianbo LIU. Sea-Level Fluctuations in the Tremadocian of the Ordovician in the Upper Yangtze Region of South China[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2017, 53(1): 66-80.

孙永超, 刘建波. 华南上扬子区奥陶纪特马豆克阶的海平面变化[J]. 北京大学学报自然科学版, 2017, 53(1): 66-80.

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URL: https://xbna.pku.edu.cn/EN/10.13209/j.0479-8023.2016.123

https://xbna.pku.edu.cn/EN/Y2017/V53/I1/66

Figures/Tables 10

Fig. 1 Paleogeographic map of the Yangtze Platform during Tremadocianian and localities of the studied sections are indexed (after Ref. [6])

Fig. 2 Field views of the lithofacies and lithofacies associations of the Tremadocian on the Upper Yangtze Region

Fig. 3 Biostratigraphic framework of the Tremadocian at the studied sections

Fig. 4 Photographs of slabs and thin-sections of the Tremadocian on the Upper Yangtze Region

Fig. 5 Photographs of sedimentary structures of the Tremadocian on the Upper Yangtze Region

Fig. 6 Photographs of thin-sections of the Tremadocian on the Upper Yangtze Region

Fig. 7 Sedimentary model for lithofacies distribution on a carbonate ramp

Fig. 8 Lithofacies changes and relative sea-level fluctuations in the Tremadocian on the Upper Yangtze Region

Fig. 9 Relative sea-level fluctuations in the Tremadocianon the Upper Yangtze Region

Fig. 10 Comparison of the Tremadocian relative sea-level fluctuations between the Upper Yangtze Region and other paleoplates

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