贵州开阳龙水地区震旦系洋水组沉积特征及生物成磷作用<sup>*</sup>

doi:10.7605/gdlxb.2021.03.032

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Abstract

The Kaiyang phosphate mine has attracted much attention due to its thick and rich phosphate ore resources. In this paper,stratigraphy,petrology and sedimentology are studied for the phosphorous-bearing Yangshui Formation in Longshui,Kaiyang,and the sedimentary environment and phosphorus formation are discussed. The lithologic assemblages of the phosphorous-bearing rock systems in the area are clay rock-dolomite-clastic phosphate rock-siliceous rock-micritic phosphate rock-stromatolite phosphate rock. In the Doushantuo age,the Longshui area was a coastal tidal flat close to the old landmass,and experienced transgression-regression twice. The sedimentary environment of the Doushantuo age changed from the barrier-free beach in the early stage to the tidal flat in the late stage,indicating a relatively dynamic environment with frequent sea-level fluctuations. The dense micritic phosphate rock,cylindrical stromatolite and phosphate biological aggregates rich in biological fossils belong to the original phosphate rock. The phosphate content of the three lithofacies is high,belonging to the high grade phosphate block rock. The depositional environment was likely a low-energy subtidal zone with medium-acidity to weak alkalinity. The close relationship between organisms and high grade phosphate rock suggests that organisms played an important role in the formation of high grade phosphate rock. Its formation has three prerequisite conditions: seawater rich in phosphorus,biological mass reproduction and conducive to biological reproduction and phosphate crystal environments.

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	Articles by authors
	Wu Wen-Ming
	Yang Rui-Dong
	Liu Jian-Zhong
	Wang Ze-Peng
	Luo Chao-Kun
	Ye Tai-Ping
	Feng Kang-Ning
	Yang Guang-Hai
	Wang Long-Bo
	Liu Song
	Wang Da-Fu
	Huang Yi
	Pan Qi-Quan
	Zhang Cheng

Key words： Kaiyang Sinian biophosphorites micritic phosphorite sedimentary environment biomineralization

Received: 14 June 2020

ZTFLH:

P588.24+4

Fund:

National Natural Science Foundation of China(Nos. U1812402,41890841),the Geological Scientific Research Projects of Guizhou Geology and Mineral Exploration and Development Bureau(Guizhou Geology and Mineral Exploration Development[2016]No.10 and No.11),the Science and Technology Department of Guizhou Provincial(No. [2018]5613),the Projects of China Geological Survey(Nos. 121201004000150017-77,121201004000160901-34)

Corresponding Authors: Yang Rui-Dong,born in 1963,is a professor and Ph.D. supervisor of Guizhou University. He is mainly engaged in sedimentary deposits. E-mail: rdyang@gzu.edu.cn.

About author: Wu Wen-Ming,born in 1984,is a Ph.D. candidate of Guizhou University. He is mainly engaged in sedimentary deposits and solid mineral exploration. E-mail: 272180889@qq.com.

Cite this article:

Wu Wen-Ming,Yang Rui-Dong,Liu Jian-Zhong et al. Sedimentary characteristics and biophosphorization of the Sinian Yangshui Formation in Longshui, Kaiyang, Guizhou Province[J]. JOPC, 2021, 23(3): 625-638.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2021.03.032 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2021/V23/I3/625

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