Artinskian (Early Permian) marine environmental disparity and evolved fusulinid foranminifa in the Dianqiangui Basin, South China

doi:10.13745/j.esf.sf.2020.6.12

Abstract

Abstract:

During the Artinskian age of the Early Permian, the marine environment was diverse in the Yunnan-Guizhou-Guangxi junction area, namely the Dianqiangui Basin, in South China, where restricted or semi-restricted marine lagoon and open and marginal marine platforms have been recognized and distinct fusulinid fauna evolved. The current study is designed to pursue the relationships among different marine environments and fusulinids. Two carbonate sections, the Dawang and Zhuzichong Sections in southern Guizhou, were studied in detail and described here for their Asselian to Artinskian strata. The Artinskian strata of the Dawang Section are mainly composed of sparite bioclastic and microcrystalline bioclastic limestones, indicating an open or marginal marine platform environment. Eighty-two fusulinid species belonging to 19 genera are recovered there, and four fusulinid biostratigraphic zones are recognized, including, in ascending order, the Pseudoschwagerina beedei-Sphaeroschwagerina constans concurrent range zone, the Staffella xiushuiensis-Eoparafusulina contracta abundance zone, the Pseudofusulina ellipsoidalis abundance zone, and the Misellina subcycloidea interval zone. In the Zhuzichong Section, calcareous mudstones were deposited during the Artinskian, suggesting a restricted or semi-restricted marine lagoon environment. Sixty-two fusulinid species belonging to 14 genera are found there and three fusulinid zones have been defined, ascendingly: the Pseudoschwagerina uddeni-Sphaeroschwagerina sphaerica assemblage zone, the Eoparafusulina certa abundance zone, and the Staffella discoides range zone. Moreover, another section of this area, the Zongdi Section, was introduced for its Artinskian strata, as well as the Staffella-Pseudoendothyra assemblage zone recognized there. An extended cross-sectional study, covering sections featuring different types of marine environments in the Dianqiangui Basin, revealed the characteristics of fusulinid fauna that evolved there. During the Artinskian, Pamirina was the typical genus in the open or marginal marine platform along with thriving schwagerines, while staffellines developed abundantly in the restricted or semi-restricted environment. The main marine environmental factors affecting the fusulinid foraminifera included hydrodynamics and sunlight and oxygen, which could explain the fusulinid distributions in different marine environments. Fusulinids developed large fusiform tests and strong septa flutes, such as schwagerines, with small test surface-to-volume ratios, therefore are more suited for the open and marginal platform environments with strong waves, good sunlight, and sufficient oxygen. However, staffellines have small lenticular tests and simple inner structures with large test surface-to-volume ratios, which enabled their survival in restricted environments with less sunlight and low oxygen.

Key words: Artinskian, Dianqiangui Basin, fusulinid foraminifera, biostratigraphy, paleoecology

CLC Number:

P52
P534.4

HUANG Mingli, TIAN Kunxuan, SHI Yukun. Artinskian (Early Permian) marine environmental disparity and evolved fusulinid foranminifa in the Dianqiangui Basin, South China[J]. Earth Science Frontiers, 2020, 27(6): 313-328.

Figures/Tables 9

Fig.1 Paleogeographic map of South China in the Artinskian.Modified after [16,31].

Fig.2 Geographical locations of the Dawang and Zhuzichong Sections in southern Guizhou

Fig.3 Fusulinids from the Dawang and Zhuzichong Sections (Ⅰ)

Fig.4 Fusulinids from the Dawang and Zhuzichong Sections (Ⅱ)

Fig.5 Fusulinids from the Dawang and Zhuzichong Sections (Ⅲ)

Fig.6 Biostratigraphic zones and species ranges of fusulinid fossils in the Dawang Section

Fig.7 Biostratigraphic zones and species ranges of fusulinid fossils in the Zhuzichong Section

Table 1 Correlation of Early Permian fusulinid zones of the Dawang and Zhuzichong Sections in Guizhou and South China (Fusulinid zones in South China adapted from [13,21,45]).

Table 2 Comparison of fusulinid faunas in the Artinskian Stage in the Dianqiangui Basin

亚科	属	开阔海台地或台地边缘环境各剖面种数											局限或半局限海台地环境各剖面种数
亚科	属	贵州打望	云南小独山		贵州扁平		贵州猴场		贵州大营打拜		广西隆林常么		贵州宗地	贵州普安龙吟	贵州竹子冲	广西宜山马脑山	贵州盘县新塘	贵州盘县上平川
Kahlerininae	Pamirina	1		4		1		7		2		1
Schwagerininae	Schwagerina	2		4		4		3				7	15	4
	Pseudofusulina	9		4				2		2		9	18	16
	Eoparafusulina	3						1					1
	Chalaroschwagerina			3		2		1				1	1
	Rugosofusulina							1		1				1
	Parafusulina											3	2	1
Staffellininae	Staffella	5		2				1		2		1	3	2	4	1	1	1
	Nankinella														2			3
	Pseudoendothyra											1	2			4	1
Pseudoschwa- gerininae	Sphaeroschwagerina			1
	Robustoschwagerina												1	1
	Zellia							1									1	1
参考文献		本文		[30]		[42]		[29]		[42]		[49]	[32,54]	[55]	本文	[28]	[42][42]

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