|Table of Contents|

Origin Models of Molar Tooth Structures and Their Temporal Spatial Distribution Significances(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2009年第03期
Page:
245-253
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Origin Models of Molar Tooth Structures and Their Temporal Spatial Distribution Significances
Author(s):
CHEN Liu-qin
(School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)
Keywords:
Molar tooth carbonates;  Precambrian conundrum;  molar tooth structure;  genetic model
PACS:
P534.1;P588.24+5
DOI:
-
Abstract:
Molar tooth carbonate is a category of fine-grained cryptocrystalline mud carbonate in the Precambrian era with molar tooth structure, which are characterized by various morphologic features and different sizes filled with equigranular microspar calcite, and there is no analog in the Phanerozoic. On the basis of the research course analysis and the latest investigation on molar tooth structures, six dominating origin models are outlined. The core issue is how to construct a reasonable physical, chemical and microbial condition for early rapid precipitation and filling of molar tooth cracks in the subtidal shallow marine. Of these, three models of gas bubble and expansion crack origin, microbial-geochemical origin and synsedimentary seismic origin are the most representative ones. Molar tooth structures are episodically located in Precambrian subtidal shallow marine environment, and their temporal and spatial characteristics indicate incompatibility with stromatolites. The fact that molar tooth carbonates were concentrated in the period of Mid- and Neo-Proterozoic may reflect the only combination of favorable physical, chemical and biological conditions in the entire geological history. Understanding the genetic origin of molar tooth structures is a crucial clue to the complicated Precambrian carbonate world.

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Last Update: 2009-09-20