Rapid Carbonization: Does Coal Really Require Millions of Years?
Coal formation is commonly associated with geological processes extending over millions of years. Yet laboratory experiments demonstrate something important: the chemical transformation of plant material into carbon-rich, coal-like material can occur surprisingly rapidly when the necessary conditions are present.
This does not, by itself, prove that natural coal deposits formed rapidly. It does demonstrate, however, that the chemistry of carbonization does not inherently require millions of years. The rate depends strongly upon conditions such as temperature, pressure, water, and the chemistry of the original organic material.
“Researchers used to believe that the lignin molecule synthesized in the laboratory by a random polymerization was the same as that occurring in nature, but this may not be true,” said Hatcher. “If we use a different model for lignin, one that is more ordered in the form of a helical structure, we may have to modify how we think of the chemical composition of coal.”
PennState University “Changing Wood into Coal”, Sally Kuzemchak https://news.psu.edu/story/140956/1994/06/01/research/changing-wood-coal
Carbonization Can Be Rapid
Carbonization is the conversion of organic material into increasingly carbon-rich material through chemical reactions that remove hydrogen, oxygen, and other volatile components. Carbonization and related reactions are important components of the broader process called coalification, through which buried plant material is transformed from peat through progressively higher ranks of coal.¹
Laboratory experiments can dramatically accelerate these reactions.
For example, hydrothermal carbonization, which exposes biomass to hot compressed water, can produce a carbon-rich, coal-like substance commonly called hydrochar or biocoal. In one published experiment, beech wood was converted into biocoal after only three hours at 210°C. The carbon content increased from approximately 48% to 57%.²
Other experiments have produced substantial carbonization of plant biomass in minutes rather than millions of years when subjected to elevated temperatures and pressures.
These laboratory products should not simply be equated with every characteristic of naturally occurring geological coal. Nevertheless, the experiments demonstrate an important principle:
Time is not the only controlling variable in coalification. Conditions matter enormously.
Recognizable Plant Structure Can Remain in Coal
Coal is not simply a featureless mass of carbon. Researchers can identify remnants of the plants from which it formed.
Penn State geochemist Patrick Hatcher described coal as a complex mixture derived from wood, roots, stems, leaves, and other organic material. His research examined how original plant structures and molecules survive during coalification.
Hatcher made this striking observation:
“Even in bituminous coal, we can still see the basic heterogeneous structure of plant cells.”
He also noted that tree-ring structure can remain recognizable within coal.³
This is important because the transformation of vegetation into coal does not necessarily obliterate the original biological structure. Coalification can chemically alter plant material while preserving remarkable details of the original plants.
Fossil forests associated with coal-bearing strata likewise preserve enough anatomical detail that researchers can study individual growth rings. In one published study, researchers selected 53 well-preserved fossil trees and measured 2,081 individual tree rings, with some sequences containing as many as 77 rings.⁴
The preservation of such structures provides a remarkable record of the vegetation incorporated into these deposits.
Laboratory Experiments Demonstrate the Importance of Conditions
Experimental carbonization has long been used to investigate the chemistry involved in coalification. Researchers have found similarities between the chemical changes produced experimentally and those observed in naturally occurring coal.
A study published in Carbon, for example, examined the carbonization of biological materials and concluded that laboratory carbonization showed processes comparable to those observed during coalification.⁵
The crucial difference is the conditions.
Conventional geological models generally propose relatively low temperatures operating for long periods. Laboratory experiments can produce related chemical transformations rapidly by greatly increasing temperature, pressure, or both.
This illustrates a fundamental chemical principle:
Reaction rates can change enormously when physical conditions change.
Therefore, demonstrating that a particular reaction proceeds slowly under one set of conditions does not establish that it must always proceed at that rate.
Does Rapid Carbonization Prove Rapid Coal Formation?
No single laboratory experiment can establish how every natural coal seam formed. Laboratory-produced hydrochar or biocoal is also not necessarily chemically or structurally identical to mature bituminous or anthracite coal.
But the experiments establish something more limited, and important:
Organic material does not require millions of years merely to undergo substantial carbonization and develop coal-like characteristics.
Once the appropriate physical and chemical conditions are supplied, major transformations can occur within hours, days, or relatively short experimental periods.
The real geological question therefore is not simply:
“How much time is required?”
It is also:
“What conditions existed while the coal was forming?”
From a creationist Flood model, enormous quantities of vegetation could have been uprooted, transported, sorted, buried, compressed, heated, and chemically altered during catastrophic sedimentation. Under such a model, thick coal deposits would represent rapidly accumulated vegetation subsequently transformed under unusual geological conditions rather than millions of years of slow accumulation in undisturbed peat swamps.
Rapid carbonization experiments do not prove that Flood interpretation. They do, however, demonstrate experimentally that long periods of time are not intrinsically required for many of the chemical transformations involved in turning plant material into carbon-rich, coal-like material.
Sources
- ScienceDirect Topics, “Carbonization,” overview of carbonization and coalification processes.
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/carbonization - Funke et al., research on hydrothermal carbonization and biocoal production. Related experimental work demonstrates conversion of wood biomass into coal-like material at elevated temperature and pressure.
https://www.sciencedirect.com/science/article/pii/S0016236112003675 - Penn State University, “Changing Wood into Coal,” research by Patrick Hatcher concerning preservation of plant structure and the chemistry of coalification.
https://www.psu.edu/news/research/story/changing-wood-coal - Palaeogeography, Palaeoclimatology, Palaeoecology, fossil-tree-ring study involving 2,081 measured rings from 53 specimens.
https://www.sciencedirect.com/science/article/pii/S0031018217300974 - S. Mrozowski, “ESR Studies of Carbonization and Coalification Processes Part II: Biological Materials,” Carbon 26 (1988): 531–541.
https://www.sciencedirect.com/science/article/pii/0008622388901522
