Revised Classification of Microbial Carbonates: Complementing the Classification of Limestones

Mingxiang, Mei

doi:10.1016/s1872-5791(07)60044-x

Cited by 66 publications

(26 citation statements)

References 32 publications

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“…Considered as speciWc growth forms, oncoids are generally not distinguished from previous microbial carbonate types (Leinfelder and Schmid 2000). Subsequently, Mei (2007) interpreted oncoids as an additional microbial carbonate type and did not longer consider them as one type of spherical stromatolite. Ooids are also not included in the diVerent categories of microbial carbonates.…”

Section: Microbial Carbonatesmentioning

confidence: 99%

Microbial carbonates and corals on the marginal French Jura platform (Late Oxfordian, Molinges section)

Olivier

Colombié

Pittet

et al. 2010

Facies

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International audienceMolinges was located on an Upper Jurassic ramp system of low-energy regime that developed at the southern margin of the French Jura platform. The sedimentary succession is characterized by the transition from a mixed siliciclastic-carbonate to a carbonate depositional setting that occurred during a long-term shallowing-upward trend. The disappearance of siliciclastics is explained by a climatic change, from humid and cold to drier and warmer conditions, previously identified in Late Oxfordian adjacent basins. The base of the section shows marl-limestone alternations of outer ramp. In its middle part, the section displays oncolitic marls, coral-microbialite beds and oncolitic limestones that deposited in a mid ramp position. Finally, the upper section part is made of oolitic limestones of inner ramp. In outer- to mid-ramp settings submitted to terrigenous inputs, the stacking pattern of deposits and facies evolution allow the identification of elementary, small-, medium-, and large-scale sequences. Small amplitudes of sea-level variations probably controlled rapid shifts of facies belts and reef window occurrences. In small-scale sequences, the coral beds developed during periods of sea-level rise. The decreasing rate of sea-level rise is marked by the downramp shift of the oncolitic limestone belt that led to the demise of coral-microbialite beds. These bioconstructions are mainly represented by thin biostromes in which corals never reach great sizes. The coral assemblages mainly include the genera Enallhelia, Dimorpharaea, Thamnasteria, and some solitary forms (Montlivaltia and Epistreptophyllum). They suggest relatively low-mesotrophic conditions in marine waters during the edification of the primary framework. Relatively cold water temperatures and periods of more elevated nutrient contents are probably responsible of the reduced coral development and the formation of a large amount of microbialites

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Section: Microbial Carbonatesmentioning

confidence: 99%

Microbial carbonates and corals on the marginal French Jura platform (Late Oxfordian, Molinges section)

Olivier

Colombié

Pittet

et al. 2010

Facies

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“…In the past ∼4,000 years, northern China has been ruled by many dynasties. Although some studies have discussed about regional precipitation changes and cultural development (Yin et al, 2005;Gu et al, 2007;Zhang et al, 2008;Tan et al, 2011), there are few research materials discussing the relationship between precipitation and cultural development in large areas. The median grain size of NYSM region, as discussed above, is a good indicator of monsoon precipitation over a large area, which can compensate for the deficiency of previous research.…”

Section: Monsoon Precipitation Changes and Civilization In Northern Cmentioning

confidence: 99%

Monsoon Precipitation, Economy and Wars in Ancient China

et al. 2020

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Northern China, particularly the Yellow River Basin, which is the birth place of Chinese civilization and has been the political center throughout most of China's history, is an ideal region for studying the response of human activities to climate change. However, studies on links between climate change and variations in earlier civilization are limited due to the scarcity of macroscale monsoon precipitation records. In the present study, a ∼4,000-year record of monsoon precipitation, which represents average rainfall in large areas in northern China, was reconstructed from sediments in Northern Yellow Sea Mud (NYSM). The record shows high monsoon precipitation during ∼4,000-2,500 BP, ∼1,350-750 BP and the past ∼250 years. In general, our record of monsoon precipitation exhibits trends similar to the percentages of planted Poaceae pollen in lake sediments and the Chinese economic index, contrasting with the frequency of wars over the past 2,000 years. We postulated that, in the agricultural society of ancient China, low monsoon precipitation in northern China may be an important factor that cause reduced agricultural production, declined economy and even the occurrence of wars.

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“…Mei Mingxiang, a scholar in China, supplemented the classification system of microbialites. He used laminite and oncolite as two types of microbialites (Mei 2007a). Based on the growth form of microbialites, microbialites are divided into two major types in this paper, namely nongranular and granular types.…”

Section: Microbialite Types and Characteristicsmentioning

confidence: 99%

Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China

et al. 2019

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This study is the first systematic assessment of the Lower Ordovician microbial carbonates in Songzi, Hubei Province, China. This paper divides the microbial carbonates into two types according to growth patterns, namely nongranular and granular. The nongranular types include stromatolites, thrombolites, dendrolites, leiolites and laminites; the granular types are mainly oncolites and may include a small amount of microbiogenic oolite. According to their geometric features, the stromatolites can be divided into four types: stratiform, wavy, columnar and domal. Additionally, dipyramidal columnar stromatolites are identified for the first time and represent a new type of columnar stromatolite. The thrombolites are divided into three types: speckled, reticulated and banded. The grazing gastropod Ecculiomphalus and traces of bioturbation are observed in the speckled and reticulated thrombolites. This paper considers these two kinds of thrombolites to represent bioturbated thrombolites. These findings not only fill gaps in the field of domestic Ordovician bioturbated thrombolites but also provide new information for the study of thrombolites. Based on the analysis of the sedimentary characteristics of microbialites, the depositional environments of the various types of microbialites are described, and the distribution patterns of their depositional environments are summarized. The relationship between the development of microbialites and the evolution and radiation of metazoans during the Early to Middle Ordovician is discussed. Consistent with the correspondence between the stepwise and rapid radiation of metazoans and the abrupt reduction in the number of microbialites between the late Early Ordovician and the early Middle Ordovician, fossils of benthonic grazing gastropods (Ecculiomphalus) were found in the stromatolites and thrombolite of the study area. It is believed that the gradual reduction in microbialites was related to the rapid increase in the abundance of metazoans. Grazers not only grazed on the microorganisms that formed stromatolites, resulting in a continuous reduction in the number of stromatolites, but also disrupted the growth state of the stromatolites, resulting in the formation of unique bioturbated thrombolites in the study area. Hydrocarbon potential analysis shows that the microbialites in the Nanjinguan Formation represent better source rocks than those in the other formations.

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Revised Classification of Microbial Carbonates: Complementing the Classification of Limestones

Cited by 66 publications

References 32 publications

Microbial carbonates and corals on the marginal French Jura platform (Late Oxfordian, Molinges section)

Microbial carbonates and corals on the marginal French Jura platform (Late Oxfordian, Molinges section)

Monsoon Precipitation, Economy and Wars in Ancient China

Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China

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