Difference between revisions of "The peopling of the Philippines: theories, literature, evidence"
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There are actually several theories on how the various geological (including tectonic and climatic) forces resulted in the emergence and shaping of the Philippine islands, as well as the time scales involved. These theories agree on some key aspects and conflict on others. For detailed explanation about particular theories and their ramifications, see: [[Geological development of the Philippine islands]]. | There are actually several theories on how the various geological (including tectonic and climatic) forces resulted in the emergence and shaping of the Philippine islands, as well as the time scales involved. These theories agree on some key aspects and conflict on others. For detailed explanation about particular theories and their ramifications, see: [[Geological development of the Philippine islands]]. | ||
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| + | === Fundamental role of plate tectonics === | ||
On vast time scales of millions of years, it is now well-established that tectonic plate movements shaped much of the geological structure that now underlies the Philippines. The plate tectonic reconstructions of SEARG [http://searg.rhul.ac.uk/current-research/research-by-topic/plate-tectonic-reconstructions-models/] show these movements in a graphic way that is easily grasped by ordinary people. | On vast time scales of millions of years, it is now well-established that tectonic plate movements shaped much of the geological structure that now underlies the Philippines. The plate tectonic reconstructions of SEARG [http://searg.rhul.ac.uk/current-research/research-by-topic/plate-tectonic-reconstructions-models/] show these movements in a graphic way that is easily grasped by ordinary people. | ||
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[[File:Eurasia-Pacific tectonic plates.png]] | [[File:Eurasia-Pacific tectonic plates.png]] | ||
| − | On relatively shorter time scales of a few million years or less, tectonic plate movements have a less dramatic impact on the configuration of the emergent archipelago. Meanwhile, on such scales, volcanism, subsidence and uplifting, and major climate changes continue to reshape particular island arcs, "land bridges", and mountain ranges whether now submerged or above sea level. In that context, the continued movement and reshaping of the Philippine land forms have greatly affected the pattern of how the country was eventually | + | |
| + | === Effect of other geological forces === | ||
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| + | On relatively shorter time scales of a few million years or less, tectonic plate movements have a less dramatic impact on the configuration of the emergent archipelago. Meanwhile, on such scales, volcanism, subsidence and uplifting, and major climate changes continue to reshape particular island arcs, "land bridges", and mountain ranges whether now submerged or above sea level. | ||
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| + | In that context, the continued movement and reshaping of the Philippine land forms on finer scales, vis-a-vis the Eurasian land mass and neighboring island arcs, have greatly affected the pattern of how the country was eventually populated by our hominin (proto-human and later fully human) ancestors after the first founding populations arrived and settled the land. | ||
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Revision as of 02:24, 11 May 2019
Contents
General theory on the geological emergence of the Philippine islands
There are actually several theories on how the various geological (including tectonic and climatic) forces resulted in the emergence and shaping of the Philippine islands, as well as the time scales involved. These theories agree on some key aspects and conflict on others. For detailed explanation about particular theories and their ramifications, see: Geological development of the Philippine islands.
Fundamental role of plate tectonics
On vast time scales of millions of years, it is now well-established that tectonic plate movements shaped much of the geological structure that now underlies the Philippines. The plate tectonic reconstructions of SEARG [1] show these movements in a graphic way that is easily grasped by ordinary people.
Most geological experts are now agreed that the structure underlying the bulk of the country -- the Philippine Mobile Belt (PMB) sometimes simply called the Philippine Plate -- was created by the gradual convergence of the Philippine Sea Plate (itself just the western margin of the much bigger Pacific Plate domain) to the east, the Eurasian Plate (particularly its Sunda Block) to the west, and the Indo-Australian Plate to the south.
Effect of other geological forces
On relatively shorter time scales of a few million years or less, tectonic plate movements have a less dramatic impact on the configuration of the emergent archipelago. Meanwhile, on such scales, volcanism, subsidence and uplifting, and major climate changes continue to reshape particular island arcs, "land bridges", and mountain ranges whether now submerged or above sea level.
In that context, the continued movement and reshaping of the Philippine land forms on finer scales, vis-a-vis the Eurasian land mass and neighboring island arcs, have greatly affected the pattern of how the country was eventually populated by our hominin (proto-human and later fully human) ancestors after the first founding populations arrived and settled the land.
Sources
- SEARG Plate Tectonic Reconstructions – Models
- New Definition of Philippine Plate Boundaries and Implications to the Philippine Mobile Belt
- Philippine Sea and East Asian plate tectonics since 52 Ma constrained by new subducted slab reconstruction methods
- Timing and tectonic controls in the evolving orogen of SE Asia and the western Pacific and some implications for ore generation
