Ordovician-Silurian Baltic Basin keeps in it's layers the record of mega-colossal volcanic eruption events (VEI8 en.wikipedia.org/wiki/Volcani...) in a form of metabentonites. Apparently some of them came from England--many thousands of km away back in the day
doi.org/10.1130/B388...
🧪⚒️ #Geology
doi.org/10.1130/B388...
🧪⚒️ #Geology
September 4, 2026 at 2:12 PM
Ordovician-Silurian Baltic Basin keeps in it's layers the record of mega-colossal volcanic eruption events (VEI8 en.wikipedia.org/wiki/Volcani...) in a form of metabentonites. Apparently some of them came from England--many thousands of km away back in the day
doi.org/10.1130/B388...
🧪⚒️ #Geology
doi.org/10.1130/B388...
🧪⚒️ #Geology
#WeekendReading: Mangano et al., about the shift from extension to strike-slip tectonics in the Central Mediterranean. 🧪⚒️
Link: agupubs.onlinelibrary.wiley.com/doi/full/10....
Link: agupubs.onlinelibrary.wiley.com/doi/full/10....
December 26, 2025 at 7:38 AM
#WeekendReading: Mangano et al., about the shift from extension to strike-slip tectonics in the Central Mediterranean. 🧪⚒️
Link: agupubs.onlinelibrary.wiley.com/doi/full/10....
Link: agupubs.onlinelibrary.wiley.com/doi/full/10....
Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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tinyurl.com/38k4ykry
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #kinematics #backarc #earthquake #fault #faulting #platetectonics
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tinyurl.com/38k4ykry
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #kinematics #backarc #earthquake #fault #faulting #platetectonics
June 9, 2025 at 8:59 AM
Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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tinyurl.com/38k4ykry
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #kinematics #backarc #earthquake #fault #faulting #platetectonics
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tinyurl.com/38k4ykry
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #kinematics #backarc #earthquake #fault #faulting #platetectonics
Probably not in tremendous volumes ... but there always seems to be fruity things especially in backarc settings. Distinguishing which of these are syn-subduction enrichment from what might be lurking in the lithosphere (even in nominally oceanic arcs) can be challenging though.
July 24, 2026 at 3:41 PM
Probably not in tremendous volumes ... but there always seems to be fruity things especially in backarc settings. Distinguishing which of these are syn-subduction enrichment from what might be lurking in the lithosphere (even in nominally oceanic arcs) can be challenging though.
Probably of secondary concern at this point but I'm not aware of "continental" lithosphere in central and eastern Mindanao. It's a mosaic of oceanic (backarc) and quite young arc lithosphere (see Cardwell et al.'s 1980 Geophysical Monograph contribution).
October 10, 2025 at 4:45 PM
Probably of secondary concern at this point but I'm not aware of "continental" lithosphere in central and eastern Mindanao. It's a mosaic of oceanic (backarc) and quite young arc lithosphere (see Cardwell et al.'s 1980 Geophysical Monograph contribution).
My view is that they are just low degree partial melt of a particular type of mantle which, I suspect, could occur anywhere but (particularly backarc of) subduction zones are prone to melting a range of mantle compositions to a range of degrees and allowing eruption of some low degree melts.
October 3, 2025 at 6:55 AM
My view is that they are just low degree partial melt of a particular type of mantle which, I suspect, could occur anywhere but (particularly backarc of) subduction zones are prone to melting a range of mantle compositions to a range of degrees and allowing eruption of some low degree melts.
There are also some clear systematic departures from this pattern (particularly north of Merapi and Sumbing) towards the backarc. We attributed those to magma exploiting lithospheric structures (faults?, terrane boundaries?) oblique to the main arc. 2/6
May 19, 2025 at 10:20 AM
There are also some clear systematic departures from this pattern (particularly north of Merapi and Sumbing) towards the backarc. We attributed those to magma exploiting lithospheric structures (faults?, terrane boundaries?) oblique to the main arc. 2/6
Strong M6+ vertical up (reverse) faulting #earthquake near W #Japan coast. Limited societal impact, but unusual location in eastern Japan Sea, reflecting contraction of (backarc) basin.
earthquake.usgs.gov/earthquakes/...
earthquake.usgs.gov/earthquakes/...
November 26, 2024 at 4:35 PM
Strong M6+ vertical up (reverse) faulting #earthquake near W #Japan coast. Limited societal impact, but unusual location in eastern Japan Sea, reflecting contraction of (backarc) basin.
earthquake.usgs.gov/earthquakes/...
earthquake.usgs.gov/earthquakes/...
Probably closer to a backarc than a rift. Maybe.
October 15, 2025 at 6:44 PM
Probably closer to a backarc than a rift. Maybe.
3) Alvarado et al. 2005 looking at the earthquakes and faulting above the Sierras Pampeanas Flat Slab to understand basement involved faulting geologists at the time usually attributed to flat-slab subduction:
Crustal deformation in the south-central Andes backarc terranes as viewed from regional broad-band seismic waveform modelling
Summary. The convergence between the Nazca and South America tectonic plates generates a seismically active backarc region near 31°S. Earthquake locations
academic.oup.com
August 6, 2025 at 5:12 PM
3) Alvarado et al. 2005 looking at the earthquakes and faulting above the Sierras Pampeanas Flat Slab to understand basement involved faulting geologists at the time usually attributed to flat-slab subduction:
Ok, found it. It's in San Pablo in Canchis Province, southwest rather than northwest of Cusco. It's extremely close to the extinct (and weird) young backarc volcanic center Quimsachata.
July 12, 2025 at 11:10 AM
Ok, found it. It's in San Pablo in Canchis Province, southwest rather than northwest of Cusco. It's extremely close to the extinct (and weird) young backarc volcanic center Quimsachata.
Slabs are sufficiently large to establish *regional* flow patterns and effect the upper plate from the forearc to well into the backarc, so 100s of km in scale and exert enough of a suction force to pull down the upper plate by like a km in elevation.
April 9, 2025 at 11:29 AM
Slabs are sufficiently large to establish *regional* flow patterns and effect the upper plate from the forearc to well into the backarc, so 100s of km in scale and exert enough of a suction force to pull down the upper plate by like a km in elevation.
I wouldn't suggest making comparisons between a possible arc/backarc volcanic center and anything in Iceland or Mayotte. At least without talking to volcanologists first....
*subtweet*
*subtweet*
February 14, 2025 at 7:42 AM
I wouldn't suggest making comparisons between a possible arc/backarc volcanic center and anything in Iceland or Mayotte. At least without talking to volcanologists first....
*subtweet*
*subtweet*
(This is going to be where someone who works on Indonesian tectonics comes in and says all of this is wrong--so a qualifier: collisional settings and settings with lots of backarc extension may be different, there may be a factor involving degree convergence vector orthogonality to plate boundary.)
November 7, 2024 at 3:21 PM
(This is going to be where someone who works on Indonesian tectonics comes in and says all of this is wrong--so a qualifier: collisional settings and settings with lots of backarc extension may be different, there may be a factor involving degree convergence vector orthogonality to plate boundary.)
It's something like a backarc basin attempting to from within a continent.
March 21, 2024 at 3:59 AM
It's something like a backarc basin attempting to from within a continent.
How does magma move beneath slow-spreading backarc ridges?
A new #GSABulletin paper reveals a reversed plumbing systembeneath the Marsili seamount—the largest submarine volcano in the Euro-Mediterranean.
Read more: geosociety.co/Gennaro_et_al
#Volcanology #EarthScience
Image: Fig 1 from the paper
A new #GSABulletin paper reveals a reversed plumbing systembeneath the Marsili seamount—the largest submarine volcano in the Euro-Mediterranean.
Read more: geosociety.co/Gennaro_et_al
#Volcanology #EarthScience
Image: Fig 1 from the paper
February 23, 2026 at 4:01 PM
How does magma move beneath slow-spreading backarc ridges?
A new #GSABulletin paper reveals a reversed plumbing systembeneath the Marsili seamount—the largest submarine volcano in the Euro-Mediterranean.
Read more: geosociety.co/Gennaro_et_al
#Volcanology #EarthScience
Image: Fig 1 from the paper
A new #GSABulletin paper reveals a reversed plumbing systembeneath the Marsili seamount—the largest submarine volcano in the Euro-Mediterranean.
Read more: geosociety.co/Gennaro_et_al
#Volcanology #EarthScience
Image: Fig 1 from the paper
Shallow M7.1 earthquake near Northern Mariana Islands is not located near trench, so potentially a backarc event, not a shallow subduction thrust earthquake. Updated depth and focal mechanism should provide more info on the tectonic setting. 🧪⚒️
earthquake.usgs.gov/earthquakes/...
earthquake.usgs.gov/earthquakes/...
November 24, 2023 at 9:44 AM
Shallow M7.1 earthquake near Northern Mariana Islands is not located near trench, so potentially a backarc event, not a shallow subduction thrust earthquake. Updated depth and focal mechanism should provide more info on the tectonic setting. 🧪⚒️
earthquake.usgs.gov/earthquakes/...
earthquake.usgs.gov/earthquakes/...
Are you into science related to mid-ocean ridges or island arc and backarc systems? Then you may want to consider submitting an abstract to one of these sessions at the upcoming #EGU24 meeting in Vienna:
meetingorganizer.copernicus.org/EGU24/sessio...
meetingorganizer.copernicus.org/EGU24/sessio...
meetingorganizer.copernicus.org/EGU24/sessio...
meetingorganizer.copernicus.org/EGU24/sessio...
December 7, 2023 at 1:26 PM
Are you into science related to mid-ocean ridges or island arc and backarc systems? Then you may want to consider submitting an abstract to one of these sessions at the upcoming #EGU24 meeting in Vienna:
meetingorganizer.copernicus.org/EGU24/sessio...
meetingorganizer.copernicus.org/EGU24/sessio...
meetingorganizer.copernicus.org/EGU24/sessio...
meetingorganizer.copernicus.org/EGU24/sessio...
En route to Sado Island and Noto Peninsula in the Sea of 🇯🇵. Goal: understand how tectonic and wave conditions promote/prevent the creation of marine terraces. Sado is made of backarc volcaniclastics later thrusted up. I'll let the Sado Geopark explain:
1/2
1/2
October 27, 2023 at 7:46 AM
En route to Sado Island and Noto Peninsula in the Sea of 🇯🇵. Goal: understand how tectonic and wave conditions promote/prevent the creation of marine terraces. Sado is made of backarc volcaniclastics later thrusted up. I'll let the Sado Geopark explain:
1/2
1/2
Start your morning with views of #pillowlava
@nautiluslive.org is diving in the Mariana backarc at the Burke vent field ~3700m nautiluslive.org
@nautiluslive.org is diving in the Mariana backarc at the Burke vent field ~3700m nautiluslive.org
May 20, 2025 at 12:24 PM
Start your morning with views of #pillowlava
@nautiluslive.org is diving in the Mariana backarc at the Burke vent field ~3700m nautiluslive.org
@nautiluslive.org is diving in the Mariana backarc at the Burke vent field ~3700m nautiluslive.org
Deep source regions for Patagonia backarc volcanism imaged by finite frequency body wave tomography
https://doi.org/10.31223/X5XF08
https://doi.org/10.31223/X5XF08
April 10, 2025 at 10:00 AM
Deep source regions for Patagonia backarc volcanism imaged by finite frequency body wave tomography
https://doi.org/10.31223/X5XF08
https://doi.org/10.31223/X5XF08
Findings from western North America suggest small-scale convection in the backarc asthenosphere may play a key role in maintaining high temperatures. Read more in this CJES collection honouring Roy D. Hyndman ➡️ buff.ly/wP9uBzJ
April 4, 2025 at 2:53 PM
Findings from western North America suggest small-scale convection in the backarc asthenosphere may play a key role in maintaining high temperatures. Read more in this CJES collection honouring Roy D. Hyndman ➡️ buff.ly/wP9uBzJ