#pseudotachylite

[spacenutspod]

SpaceTime Series 27 Episode 119 *Australian Crater Offers Fresh Insights into Earth's History Scientists have uncovered a potential 600-kilometre-wide crater in Australia's outback, which could revolutionise our understanding of Earth's geological past. This discovery, presented at the 37th International Geological Congress in South Korea, suggests the existence of Mapix, a massive Cambrian-Precambrian impact structure. The crater's unique characteristics could provide new insights into the geological and biological evolution of our planet. The study's authors have found significant geological evidence, including pseudotachylite breccia and shock minerals like lonsdaleite, supporting the age, size, and location of this impact structure. *Perseverance Rover Discovers Striped Rock on Mars NASA's Mars Perseverance rover has spotted an unusual black and white striped rock on the Red Planet. The discovery was made during the rover's exploration of the outer rim of Jezero Crater. The rock, named Freya Castle, has a striking pattern and is unlike anything previously observed on Mars. Early interpretations suggest that igneous and metamorphic processes could have created its distinctive stripes. This finding adds to the variety of intriguing rocks discovered by the rover, which could be among the oldest or youngest ever investigated on Mars. *Blue Origin's New Glenn Completes Second Stage Hot Fire Test Blue Origin's new heavy-lift rocket, the New Glenn, has successfully completed a hot fire test of its second stage booster. This critical test at Cape Canaveral's Space Launch Complex 36 marks a key step towards the rocket's inaugural test flight, scheduled for next month. The NG-1 mission will carry the prototype Blue Ring spacecraft, designed for refuelling, transporting, and hosting satellites. The 15-second hot fire test demonstrated the integrated operation of the vehicle's BE-3U engines and various subsystems, setting the stage for future missions. www.spacetimewithstuartgary.com www.bitesz.com 🌏 Get Our Exclusive NordVPN deal here ➼ www.bitesz.com/nordvpn. The discount and bonuses are incredible! And it’s risk-free with Nord’s 30-day money-back guarantee! ✌ Check out our newest sponsor - Old Glory - Iconic Music and Sports Merch. Well worth a look.... Become a supporter of this podcast and access commercial-free episodes plus bonuses: https://www.spreaker.com/podcast/spacetime-with-stuart-gary--2458531/support. 00:00 - This is spacetime series 27 episode 119 for broadcast on 2 October 2024 00:49 - Scientists have discovered a possible crater stretching more than 600 kilometres across Australia's outback 02:54 - NASA's Mars Perseverance rover has discovered an unusual striped rock 05:46 - The Mars Perseverance rover is exploring ancient Martian rocks 10:59 - Researchers have found nanostructures around deep ocean hydrothermal vents 12:57 - 61% of Americans admit to self censoring, according to study 15:09 - Meta showing off their new Orion augmented reality glasses; Huawei releasing threefold phones 19:16 - Spacetime is available every Monday, Wednesday and Friday through various podcasting services

[butchharrydalton]

I will now recite the rocks in alphabetical order:

adamellite

amphibolite

andesite

anorthosite

anthracite

appinite

aphanite

arenite

argillite

arkose

basalt

basanite

blueschist 

biomicrite

biosparite

boundstone

breccia

carbonatite

cataclasite

chalk

chert

claystone

clinopyroxenite

coal

conglomerate 

coquina

dacite

diamictite

diatomite

diorite

dolomite 

dunite

eclogite

essexite

evaporite

flint

foidite

gabbro

gabbronorite

gneiss

gossan

granite

granodiorite 

granophyre

granulite

graywacke

gritstone

greensand

greenschist

harzburgite

hornblendite

hornfel

hyaloclastite

icelandite

ignimbrite

ijolite

itacolumite

jadeitite

jasperoid

jaspillite

kenyte

kimberlite

komatiite

lamproite

lamprophyre

larvikite

laterite

latite

lherzolite

lignite

limestone

litchfieldite

litharenite

llanite

luxullianite

mangerite

marble

marl

metapelite

metapsammite

migmatite

minette

monzodiorite

monzogranite

monzonite

mudstone

mylonite

nepheline syenite

nephelinite

norite

novaculite

obsidian

oil shale

oolite

pantellerite

pegmatite

peridotite

phonolite

picrite

porphyry

phyllite

pseudotachylite

pumice

pyrolite

pyroxenite

quartzarenite

quartzite

rhyolite

sandstone

schist

scoria

shale

siltstone

serpentinite

shonkinite

skarn

slate

suevite

soapstone

syenite

syenogranite

taconite

tephrite

teschenite

theralite

tholeiite

tonalite

trachyte

travertine

tuff

turbidite

urtite

variolite

wackestone

websterite

wehrlite

whiteschist

xenolith

[mousefluff]

ace rights, adakite, adamellite, andesite, alkali feldpsar granite, anorthosite, anthracite, amphibolite, aphanite, aplite, appinite, argilite, arkose, banded iron formation, basalt, basaltic trachyandesite, basanite, benmoreite, blairmorite, blue granite, blueschist, boninite, borolanite, breccia, calcarenite, calcflinta, carbonatite, cataclasite, chalk, charnockite, chert, claystone, coal, comendite, conglomerate, coquina, corsite, dacite, diabase, diamictite, diatomite, diorite, dolostone, dunite, eclogite, enderbite, epidosite, essexite, evaporite, felsite, flint, foidolite, gabbro, ganister, geyserite, gneiss, gossan, granite, granodiorite, granophyre, granulite, greenschist, greywacke, gritstone, harzburgite, hawaiite, hornblendite, hornfels, hyaloclastite, icelandite, ignimbrite, ijolite, itacolumite, jadeite, jasperoid, jaspillite, kenyte, kimberlite, komatiite, lamproite, lamprophyre, lapis lazuli, larvikite, laterite, latite, lherzolite, lignite, limestone, litchfieldite, llanite, luxullianite, mangerite, marble, marl, metapelite, metapsammite, migmatite, minette, monzogranite, monzonite, mudstone, mugearite, mylonite, nepheline syenite, nephelinite, norite, novaculite, obsidian, oil shale, oolite, pantellerite, pegmatite, peridotite, phonolite, phonotephrite, phosphorite, phyllite, picrite, pietersite, porphyry, pseudotachylite, pumice, pyrolite, pyroxenite, quartz diorite, quartz monzonite, quartzite, quartzolite, rapakivi granite, rhomb porphyry, rhyodacite, rhyolite, rodingite, sandstone, schist, scoria, serpentinite, shale, shonkinite, shoshonite, siltstone, skarn, slate, soapstone, sovite, suevite, syenite, sylvinite, tachylite, taconite, talc carbonate, tectonite, tephriphonolite, tephrite, teschenite, theralite, tillite, tonalite, trachyandesite, tracybasalt, travertine, trachyte, troctolite, trondhjemite, tufa, tuff, turbidite, unakite, variolite, vogesite, wackestone, wad, websterite, wehrlite, whiteschist

[spacetimewithstuartgary]

Australian crater could offer fresh insight into Earth’s geological history

A probable crater stretching more than 370 miles, or 600 kilometers, across the heart of Australia could reshape our understanding of Earth’s geological history.

Researcher Daniel Connelly and Virginia Commonwealth University’s Arif Sikder, Ph.D., believe they have found evidence to support the existence of MAPCIS – the Massive Australian Precambrian-Cambrian Impact Structure -– which is a nonconcentric complex crater that could provide new insights into the geological and biological evolution of our planet.

“Working on the MAPCIS project has been an incredible journey,” said Sikder, an associate professor in the Center for Environmental Studies, a unit of VCU Life Sciences. “The data we’ve gathered offers a unique glimpse into the forces that have shaped our planet, and I’m excited about the future research this discovery will inspire.”

This month, Connelly will make a presentation in Anaheim, California, at Connects 2024, the Geological Society of America’s annual meeting. In August, he presented at the 37th International Geological Congress 2024 in Busan, South Korea. According to researchers, the impact occurred at the end of the Ediacaran period, within the Neoproterozoic Era, which spans from 1 billion to 538.8 million years ago.

Among the geological evidence they have uncovered to support the age, size and location of the impact are massive deposits of pseudotachylite breccia, or melt rock, near the crater center. The researchers found shocked minerals, including lonsdaleite, or shocked diamond, in the deposits, along with impact level amounts of iridium.

“The discovery of MAPCIS is a testament to the power of collaborative research,” Connelly said. “Our findings not only highlight the significance of this impact structure but also open new avenues for understanding Earth’s geological past.”

[geologyjohnson]

The weird black and pink rock I'm stood next to its called Pseudo-tachylite and it formed in a spectacular and cataclysmic event. Around 2 billion years ago, a 15km wide chunk of rock face planted into what would become south africa at a velocity of around 200,000km+ an hour. It created a crater 60 km deep and 300 km wide with a central uplift region around 17 km high. This was one of the biggest impacts in Earth's history, including being larger than the one that caused the K-Pg. Luckily the microbes that inhabited earth at this time were pretty tough critters so life continued in the aftermath. Today most of the structure has been eroded away, a ring hills 90 km across is all that survives on the surface near the towns of Parys and Vredefort South Africa. These hills represent rock that was tilted upwards by the blast during the impact. The underlying rock made of hard granitic gneiss was shattered and blasted outwards as huge blocks carried in a slurry of melted rock. The melted rock quickly cooled to glass as water poured into the new crater. This rock is the pseudo-tachylite I'm stupid next to in the photo. It was injected into the bedrock in these wonderfully messy veins by the force of the impact. I've wanted to see this place in person for a long time and it did not disappoint! If you are in the area, contact Karen or Graeme at Otters Haunt for a tour of the quarry and the geological details! #geologyjohnson #geology #meteor #crater #pseudotachylite #vredefort #parys #archean #precambrian #paleoproterozoic #SouthAfrica #granite #gneiss https://www.instagram.com/p/Ccc_th8twwv/?igshid=NGJjMDIxMWI=

[earthstory]

Glassy This is such a neat rock. Ever seen obsidian? It’s formed when rock is molten and cools fast enough that it can’t form crystals. The dark material in this rock is very similar – a rock type called a pseudotachylite. A tachylyte is the term for basaltic glass, typically formed when basaltic lava enters the ocean and rapidly cools. The dark portion of this rock, a pseudotachylite, forms when the rock is rapidly heated and cooled, leaving behind a dark, glassy rock with either very fine crystals or no crystals. This rock started as a part of the Precambrian crust in Colorado. In this case, the rocks are found in a 1.4 billion year old fault zone. The rocks were fractured and heated by friction caused by the faulting. -JBB Image credit: James St. John https://flic.kr/p/yggCSf

[minourp]

Day 14: Fight

No idea where I was going with this but I think it ended up being New Tail (2e1)

[quasarlasar]

Sam awakened in a pile of crushed rock and shifted sediment. Ptoo! Not again…he thought to himself as he sat up out of the dirt and spat powdery soil from his mouth. I hope I didn’t get caught in a collapsing building…

He leaned his back onto the wall of rock behind him, and gasped for breath. It was dark, but not as pitch black as it had been when he had been trapped under the parking structure at Long Beach. As his eyes adjusted to the gloom he began to make out the patterns: sedimentary layers, speckled flecks of minerals…and an enormous crystalline crimson eye, staring down at him with its slit pupil.

He screamed and edged his back further into the wall behind him, but more eyes glinted towards him, embedded like clasts in breccia. Jagged offset fangs gleamed from within thousands of tiny cracks in the rock, slowly shifting as the rocks adjusted and re-adjusted ever so slowly. The eyes tracked him with their slit pupils as he painfully shuffled down the length of the crevasse, tears streaming down his face as he tried his best not to scream.

Breathing. The ground was breathing. He could feel its heartbeat: a heavy, echoing thump that reverberated through the ground and into the soles of his feat, twitching his legs and shivering his spine. He could hear its voice, pained, labored groaning that undulated along the crevasse walls and resonated in his chest, a sobering, haunting feeling. Molten rock dripped down like blood from the walls, oozing out from where friction had glassed over the interior of the Earth itself.

Alive. This place was alive…part of the body of a living, breathing force that ran its way through the entire state of California. An ancient elder god that shaped the landscape solely according to its own unknowable schedule.

Sam felt terrified. Powerless. Forced to bow down to the Earth itself. What was dropping, covering, and holding on if not an admission of your own insignificance, prostrate and groveling before the inviscid ground?

He placed his hand on the walls, feeling every curve and bump in the damaged rock. More molten rock drizzled down from above, hissing before solidifying into pseudotachylite as it hit the rubble.

“You’re in pain…aren’t you?” Sam said.

The eyes closed, and the rocks released something almost like a sigh.

“I HAVE SUFFERED WORSE. A BETTER QUESTION IS: ARE YOU?”

“I don’t know…I guess I am…mostly just feeling pretty shaken?”

Sam grinned at his lame pun before suddenly panicking and covering his mouth. Crap! What happens if he actually laughs? Could he rip open again?

Fortunately for him, San Andreas seemed too worn out from his battle with Cascadia to do anything more.

“…JUST…NEXT TIME…TRY NOT TO PISS OFF A SUBDUCTION ZONE, OKAY KID?”

===========================================================

Sorry for the lack of comics again...I’ve been busy with my thesis and getting sick for a while didn’t exactly help either. 

I’ve been spending what creative time I have working on the second draft of my sci-fi novel as well as outlines and rough drafts of other stories I hope to potentially publish someday.

Those of you who are earlier followers of mine might remember a little something called the “San Andreas Campaign”...I sort of fell off the wagon on this one, not adding any new comics to it since the end of 2018. 

To be quite frank after the Ridgecrest earthquakes happened last year I got too freaked out to do anything with my fault characters for a long time. 

I’m finally starting to feel comfortable enough to actually get back to using them...though so far this has only taken the form of me writing the story of how the spirit of the San Andreas Fault actually got around to becoming sorta-friends with a human in the first place.

...For whatever reason in the past few years I have been getting less and less ideas for jokes or comic strips, and more ideas for long form stories that I pretty much only have time to put down in writing. 

[environmentguru]

Dating paleo-seismic faulting in the Taiwan Mountain Belt

Abstract In-situ 40Ar/39Ar laser microprobe dating was carried out on the Hoping pseudotachylite from a mylonite-fault zone in the metamorphosed basement complex of the active Taiwan Mountain Belt to determine the timing of the responsible earthquake https://www.environmentguru.com/pages/elements/element.aspx?utm_source=dlvr.it&utm_medium=tumblr&id=5993774

[xtruss]

The Earth Story: Glassy

This is such a neat rock. Ever seen obsidian? It’s formed when rock is molten and cools fast enough that it can’t form crystals. The dark material in this rock is very similar – a rock type called a pseudotachylite.

A tachylyte is the term for basaltic glass, typically formed when basaltic lava enters the ocean and rapidly cools. The dark portion of this rock, a pseudotachylite, forms when the rock is rapidly heated and cooled, leaving behind a dark, glassy rock with either very fine crystals or no crystals. This rock started as a part of the Precambrian crust in Colorado. In this case, the rocks are found in a 1.4 billion year old fault zone. The rocks were fractured and heated by friction caused by the faulting.

[earthstory]

Pseudotachylite

Rub your hands together. Feel warm? Now imagine that you could squeeze them together harder, and that well, your hands were rocks, so that there was a whole lot more friction. How hot would your imaginary rock hands get if they kept rubbing together. Hot enough to melt maybe?

That’s a pseudotachylite. In active fault zones, rocks are rubbing together rapidly, with huge amounts of friction between the rocks. That friction can be converted to heat energy when the fault moves, so much heat that the rock can melt.

A fault pseudotachylite is created from the friction of rocks rubbing together in a fault zone. The heat melts a small amount of the rock, creating a thin layer of molten rock that rapidly cools, leaving it with an extremely fine-grained or even glassy texture. Often, chunks of the surrounding rock are found chewed up and trapped within the glassy pseudotachylite. Other pseudotachylites can be found in impact zones, produced when rocks are again rubbed up against each other at high speeds during the impact.

This pseudotachylite is found within 1.3 billion year old crystalline rocks in Homestake Creek Valley, in Colorado.

-JBB

Image credit: James St. John https://flic.kr/p/yVWugg

References: http://geology.about.com/od/rocks/a/aa_fractfrict.htm http://www.lpl.arizona.edu/~rlorenz/pseud.html