臼齿碳酸盐岩: 解密前寒武纪海洋化学性质的钥匙<sup>*</sup>

doi:10.7605/gdlxb.2023.01.001

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Abstract

Molar tooth structure(MTS)refers to a series of peculiar, ptygmatically folded and spar-filled cracks in fine-grained carbonates of the Precambrian. Particular Precambrian carbonate with MTS is called the Molar tooth carbonate(MTC). Consensuses have been achieved that the MTS is globally distributed and composed of micro-sized sparry calcite,developed during a specific time limit,early diagenetic product,and has diversified morphologies. Based on a systematical summary of the palaeogeographical distribution,development time limit,macro morphology,and the micro fabric of MTS,this paper systematically analyzes the basic arguments and limitations of the three hypotheses of MTC origin, i.e.,the physical origin,biological origin,and the biogeochemical origin hypothesis. As a globally distributed special carbonate that only appeared during the Meso-and Neoproterozoic,the focuses and hot spots of the MTC researches are the formation and disappear mechanisms. Although there are still controversies about the formation mechanism,the early diagenetic characteristics of the MTC made a growing number of geologists regard the MTC as an important recorder to reestablish the geochemical properties of the Precambrian ocean. The flourishing and(or)dismissal of the MTC has a close relationship with the evolution of paleocean properties,the supercontinent cycles,and a series of global geological events. Further researches about the MTC can go in two aspects: one is to explore the reciprocal response,promotion or inhibition relationship between the MTC and global events such as stromatolites,glacial events, etc.,and how to couple the MTC events to the assembly and breakup processes of the Columbia and Rodinia supercontinents;the other is the microscopic fabric of the microspar in the MTS, select adopt effective geochemical methods,in order to combine the researches of the occurrence,evolution,and cessation of the MTC with the evolution and changes of atmosphere,biosphere,and the Precambrian ocean properties,and finally improve the theory of the MTC formation mechanism. All these researches will help and provide clues to solve several major Precambrian scientific problems.

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	KUANG Hongwei
	PENG Nan
	WANG Yuchong
	BAI Huaqing
	QI Kening
	LIU Yongqing

Key words： molar tooth carbonate molar tooth structure microfabric paleo-ocean Precambrian

Received: 21 July 2022

ZTFLH:

P588.24+5

Fund:

Co-funded by National Key Research and Development Program of China(No. 2022YFF0800302),China Geological Survey(No. DD20221649),the National Natural Science Foundation of China(Nos. 42072135; 41472082),Peking International Innovation and Resource Cooperation Program(No. Z201100008320007)

About author: KUANG Hongwei,born in 1969,is a professor and doctoral supervisor at the Institute of Geology,CAGS. She is mainly engaged in sedimentology,Meso-Neoproterozoic stratigraphy and event sedimentology. E-mail: kuanghw@126.com.

Cite this article:

KUANG Hongwei,PENG Nan,WANG Yuchong et al. Molar tooth carbonate: a key to understand geochemistry characteristics of the Precambrian ocean[J]. JOPC, 2023, 25(1): 1-22.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.01.001 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I1/1

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