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Mastodon: AboutGet the appKeyboard shortcutsView source codev4.4.0-nightly.2025-04-01

#volcanism

2 posts2 participants0 posts today
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anlomedad

A new paper states that 44 thousand year old things like ropes and remains of tuna, found on the Philippine's Ilin Island, suggest that the people were skilled seafarers and deep-sea fishers who did not arrive on the islands by happenstance on bamboo rafts but as intentional explorers in actual boats.
Press release by the researchers' university:
ateneo.edu/news/2025/02/21/clu

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Now, given how many known volcanoes there are, wouldn't it be likely that some kind of Philippine Pompeji could be found if one follows clues as to where pre-historic people might have favoured to settle?

Below is a GoogleEarth map of South East Asia, with Smithsonian's locations of #volcano sites volcano.si.edu/ge/PlacemarkLin

The red marker in the centre-right indicates Ilin Island where the archeologists did their field research.

And if they were so used to fishing, boating, maybe sailing, could they have survived a 17 thousand km trip to South America, too? ^^ With a few stopovers? What would they have done for drinking water on their island hopping?

Screenshot from Google Earth showing land and ocean in South East Asia. Also shows markers for volcanos and a marker for the Philippine's Ilin Island. Multiple volcanoes are on almost every island and many on mainland South East Asis.
#archaeology#paleontology#volcanism
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“we report two newly recognized episodes of basaltic volcanism with Pb-Pb dating for basalt fragments returned by the #Change6 mission. One high-Al basalt fragment dated at 4,203 ± 4 million years ago (Ma) has a source 238U/204Pb ratio (µ value) of ~1,620, implying a KREEP-rich (K, rare earth elements, and P) source for this oldest-known occurrence of #basaltic #volcanism among returned samples”

🌘🌋

#lunar / #moon / #volcano <nature.com/articles/s41586-024>

NatureLunar farside volcanism 2.8 billion years ago from Chang’e-6 basalts - NatureUnravelling the volcanic history of the enigmatic lunar farside is essential for understanding the hemispheric dichotomy of the Moon1-3. Cratering chronology established for the lunar nearside has been used to suggest long-lived volcanism on the farside of the Moon3,4, but without sample verification. Here we report two newly recognized episodes of basaltic volcanism with Pb-Pb dating for basalt fragments returned by the Chang’e-6 mission. One high-Al basalt fragment dated at 4,203 ± 4 million years ago (Ma) has a source 238U/204Pb ratio (µ value) of ~1,620, implying a KREEP-rich (K, rare earth elements, and P) source for this oldest-known occurrence of basaltic volcanism among returned samples. The main volcanic episode of the Chang’e-6 basalt documents a surprisingly young eruption age of 2,807 ± 3 Ma, which is not recognized from the nearside of the Moon. The initial Pb isotope compositions of these younger basalts indicate derivation from a source with a µ value of ~360, indicating a KREEP-poor mantle source. Mare volcanism on the lunar farside thus persisted for >1.4 billion years even with a shift to a source depleted in heat-producing elements. The consistency between the 2.8-billion-year basalt age and its crater-counting age indicates that the cratering chronology model established for the lunar nearside is also applicable to the farside of the Moon.
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