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Lunt, Peter
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When, how much, how fast, and why it matters; a quantitative view of stratigraphy and the emergence of a new paradigm Lunt, Peter; Luan, Xiwu
Berita Sedimentologi Vol 49, No 3 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.49.3.431

Abstract

Our understanding of the regional geology of SE Asia appears to have stagnated and, to break out of this state, a new approach to stratigraphic studies is required. We must avoid the trap of deductive studies and boilerplate formats as these restrictive methods of investigation rely heavily on assumptions that are not valid in the tectonically active basins of the region. This review examines an alternative workflow that replaces model-based methods with evidence-based ones, and in particular uses stratigraphic properties in a quantitative way to test old concepts. Through this approach a tectono-stratigraphic framework is established, and new data is used to test and then build upon this interdisciplinary framework. It is argued that only this approach can accommodate and predict the unique and locally complex geology of the region. A key component of this approach is the now stable, cross-facies, biostratigraphy, and time scale for the later Eocene to Recent of SE Asia, as well as methods in estimating paleo-bathymetry. These can be used to evaluate the sedimentary history and structural evolution of the basins, using geohistorical analysis.The application of this quantitative approach, combined with a more open attitude to sub-surface data from government authorities, makes it highly probable that there will be a paradigm shift in our understanding of regional geology across SE Asia. Examples given here illustrate the use of the quantitative methods in rejecting long-established and widely cited old ideas, and the start of building of new concepts. We have not yet arrived at the new paradigm, but we can already observe that the attenuation of Sundaland, with two separate axes of extension, both with simultaneous episodes of movement, is not consistent with any current plate tectonic hypothesis, or even any known plate mechanism. The new framework is argued to be both innovative and predictive, replacing the largely descriptive and enervated role of geology in the past few decades. A new, evidence-based role will offer a better understanding of facies palaeogeography through time and exploration risks.
Giving names to features in geology; the choice between subjective listing or researching objective natural divisions Lunt, Peter; Luan, Xiwu
Berita Sedimentologi Vol 49, No 2 (2023)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2023.49.2.429

Abstract

In literature the English playwright Shakespeare proposed that “a rose by any other name would smell as sweet”. Many geologist are also flexible about the names they apply to features, and are tolerant of both over-simplification and even making mistakes in the naming of formations or other features. It appears that precision of a single noun is considered subservient to the essence of the narrative, such as evaluating a hydrocarbon prospect, or giving an interpretation of history. Here it is argued that naming is important because geology is so rich in nouns, and consequently compound errors in the use of multiple, poorly-defined nouns rapidly degrades overall meaning. It is proposed that without names that are both natural and consistently applied, but also continually improved, the scientific framework soon falls apart. By this we mean that the geological understanding of exploration risk, or geological history, rapidly become too easily accommodating of any new data and thus loses all rigour. Good, natural names are the results of tested concepts and are themselves open to further testing. From such testing comes recognition that in nature there are both gradational variation in series as well as discrete categories. A search for good names is inexorably linked to a better understanding of the features concerned.
The importance of process in modern tectono-stratigraphy and regional geology Lunt, Peter; Luan, Xiwu
Berita Sedimentologi Vol 49, No 3 (2024)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2024.49.3.430

Abstract

In its simplest form geology is a history, which appears to only require the compilation of a chronicle. However, our data is fragmentary, and aspects such as the dimension of time and the depositional setting of sediments are obscured, especially the correlation of time over wide areas and determining rates of change. As a result, geology cannot advance just by accumulating observations, expecting that a credible narrative will inevitably emerge. There must be reality checks on the proposed history to avoid confirmation bias towards over-simple expectations. In a region suspected to be complicated and, in many ways, unique we require an abductive investigative technique to reconstruct its history. This means to force testing through cross-checking independent but related data types. Such inter-disciplinary testing can produce a rigorous framework, even to reconstruct special situations not accommodated by ideas models. This essay examines three topics necessary for such evidence-based investigation. The first is to investigate and document the reliability of observations (like the “error-bars” required in hard-sciences). Secondly is the shift from model-based to evidence-based processes (from deductive to abductive reasoning). Thirdly is the need to consider if conclusions are “significant” - i.e., is there confidence that an interpretation would be repeatable by independent workers, as well as being distinct from background variability in data. It is proposed that we must acknowledge the replication crisis highlighted in the past two decades in other sciences by considering how we work in the complex geology of SE Asia, to prevent a similar validation crisis undermining the value of the science here.