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Distinguishing between primary and secondary volcaniclastic deposits
1Department of Geology and Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, Republic of Korea.
Scientific Reports
|August 29, 2019
Summary
A new category, "reprocessed" volcaniclastic deposits, is proposed for volcanic materials altered by nonvolcanic processes. This challenges traditional primary/secondary classifications, especially when both reprocessed and reworked particles coexist.
Area of Science:
- Geology
- Volcanology
- Sedimentology
Background:
- Distinguishing primary (direct volcanic) and secondary (reworked) volcaniclastic deposits is crucial for understanding volcanic processes.
- Current definitions struggle with deposits influenced by both volcanic and nonvolcanic events.
Purpose of the Study:
- To propose a new term, "reprocessed" volcaniclastic deposits, for materials originating from eruptions but modified by nonvolcanic processes.
- To demonstrate the coexistence of reprocessed and reworked particles in a single deposit.
- To refine the classification of volcaniclastic deposits.
Main Methods:
- Case study of the 3.7 ka BP Songaksan tuff ring eruption on Jeju Island, Korea.
- Analysis of volcaniclastic deposits formed during a concurrent typhoon event.
- Examination of particle origins (vent-derived vs. substrate-derived) and depositional processes.
Main Results:
- A unique volcaniclastic deposit was identified, influenced by both the volcanic eruption and subsequent typhoon-induced wave activity.
- This deposit contained a mixture of vent-derived (primary) and substrate-derived (reworked) particles.
- The coexistence of "reprocessed" and reworked particles challenges the binary primary/secondary classification.
Conclusions:
- The proposed "reprocessed" category accounts for volcaniclastic materials deposited by nonvolcanic processes.
- Secondary volcaniclastic deposits are redefined to include both "reprocessed" and reworked particles.
- This new classification improves the interpretation of complex volcaniclastic deposits and their genetic links to volcanism.
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