#Diatreme

[thorsenmark]

Shiprock and a Look Across the New Mexico High Desert by Mark Stevens Via Flickr: A setting looking to the northwest while taking in views across the northern New Mexico high desert with a distant view to the Shiprock formation. This is at a roadside pullout along Indian Service Rte 13. With this image, I pulled back on the focal length to include more of the surrounding landscape to add to the setting in the image captured.

[coffeenuts]

Agathla Peak by ShutterJack https://flic.kr/p/2k85DYw

[rock-swag-tournament]

Rock Swag Tournament Round 1: Igneous Rocks Part 9

This is a matchup I've been looking forward to because both of these rocks do not currently form on earth, which is so cool.

Remember Bowen's Reaction Series? (Find it here, along with other igneous rock information). It tells us that certain minerals (particularly those with a lot of silica) require less heat to become molten. Meanwhile, our ultramafic minerals take a lot of heat to do the same.

Well, right now, the earth is plenty hot enough to melt mafic and felsic magmas. However, the earth has been cooling down over its 4.5 billion years of being a planet. Of course, the atmosphere is undoubtedly heating up due to human activity as we sit here and read this, but both the atmosphere AND the inside of the earth used to be much hotter. And it's a good thing, because if earth didn't cool off, we would all be super dead.

And so, a consequence of the earth cooling down is that ultramafic magmas really don't erupt anymore, which means ultramafic igneous rocks don't form anymore!

Komatiite specifically contains a lot of mangesium, and often shows spinifex texture, which is when olivine forms needle-like (acicular) grains.

And here's a word on kimberlite from out submitter (who also provided the picture at the top of the poll):

Type of peridotite that erupts from deep mantle sources in the form of diatremes (basically inverted volcano cones that are holes in the ground, sometimes called pipes). Commonly hosts diamonds bc it hits the diamond stability zone inside the mantle on the way up, but also brings up other xenoliths. Composition is mainly forsterite olivine [magnesium-rich olivine] and carbonates. When kimberlite magmas erupt they are extremely explosive due to the insane amounts of volatiles in it (one research calculated an ascent rate of 30 m/sec in comparison to Hawaiian type volcanoes having an ascent rate of 1.7 m/sec as its fastest...so that is CRAZY FAST). It's named after the Kimberly mines where it was first discovered BTW

And here's a kimberlite with a big ol' diamond.

And that's all from me unless anyone has questions :)

[rabbitcruiser]

Kayenta, AZ (No. 3)

Agathla Peak or Agathlan (Navajo: Aghaałą́, Spanish: El Capitan) is a peak south of Monument Valley, Arizona, which rises over 1,500 feet (460 meters) above the surrounding terrain. It is 7 miles (11 km) north of Kayenta and is visible from U.S. Route 163. The English designation Agathla is derived from the Navajo name aghaałą́ meaning 'much wool', apparently for the fur of antelope and deer accumulating on the rock. The mountain is considered sacred by the Navajo.

Agathla Peak is an eroded volcanic plug consisting of volcanic breccia cut by dikes of an unusual igneous rock called minette. It is one of many such volcanic diatremes that are found in Navajo country of northeast Arizona and northwest New Mexico. Agathla Peak and Shiprock in New Mexico are the most prominent. These rocks are part of the Navajo Volcanic Field, in the southern Colorado Plateau. Ages of these minettes and associated more unusual igneous rocks cluster near 25 million years.

Source: Wikipedia

[wigmund]

From Earth Science Picture of the Day; September 16, 2018:

Archive - Shiprock, New Mexico Photographer and Summary Author: Dr. Jack B. Share

Each Sunday we present a notable item from our archives. This EPOD was originally published September 15, 2012.

Shiprock gives the impression of having been volcanically thrust out from the sands of the Mancos desert, but this isn't the case. Shiprock is indeed a volcano but of a class called a diatreme, having formed explosively from gas-charged magma escaping at great velocity. It possessed a crater at the surface called a maar, but erosion has long since removed it along with much of the sedimentary strata through which it erupted. What we see now is the solidified plumbing that remains called a neck and its system of magma-radiating conduits called dikes. Thus, Shiprock is a partially-exhumed, erosionally-sculpted diatreme.

The entire Shiprock volcanic complex emplaced between 28 and 19 million years ago during the Late Oligocene to Early Miocene. Its maar crater is estimated to have been located 3,250 ft (991 m) above the present day land surface of the Mancos Shale. That means Shiprock erupted through most, if not all, of the Late Cretaceous Western Interior Seaway’s sandstones and shales as well as some overlying Tertiary sandstones. The tectonic forces that created the uplift of the Colorado Plateau were likely responsible for the diatreme’s placement within the Navajo Volcanic Field and its subsequent exhumation and erosion. Photo taken on July 5, 2012.

Photo Details: Camera Maker: Canon; Camera Model: Canon EOS 7D; Focal Length: 69.0mm; Aperture: f/8.0; Exposure Time: 0.0040 s (1/250); ISO equiv: 100; Software: Adobe Photoshop Elements 5.0 Windows.

Shiprock, New Mexico Coordinates: 36.6875, -108.836389

Related Links

Shiprock

Geology of the Colorado Plateau

Jack's Website

Student Links

A Field Trip to Maar Volcanoes

Create Sedimentary Strata

Earth Observatory

Shiprock Formation, New Mexico

[plokoonsdisapprovingeyebrows]

ive got another one for the collection of rock vegetables

FORBIDDEN CARROT

[vainaspaver]

Agathla Peak by ShutterJack +

[data-and-vision]

[geoledgy]

can I join volcano rp tumblr by being a kimberlite diatreme my specialty

[unkillability]

ghhhh ??

[thorsenmark]

Ford Butte and a Look Across the New Mexico High Desert by Mark Stevens Via Flickr: While at a roadside pullout along Indian Service Rte 5 with a view looking to the north-northwest across the northern New Mexico high desert setting. Off in the distance is the volcanic pipe, or diatreme, of Ford Butte. Given the mostly overcast skies that afternoon, I decided to zoom in and focus on the butte itself. I pulled back a little on the focal link to include some of the nearby foreground to add an interest to the image while including some skies to use as a backdrop. The rest was metering to best bring out the colors present on this somewhat overcast day.

[skrzydlanawietrze]

W oczach rozbłysnęło sto milionów gwiazd Przy ramionach czule tańczą twoje dłonie Szept najczulszych słów otula tkliwość w nas Ciało pożądaniem całe płonie Delikatnie mnie dotykasz niczym motyl Pieszczotliwie muskający skrzydeł wiatrem Serca rytm rozbrzmiewał będzie potem W tym momencie czułość płynie diatrem Wydobywa się w najgłębszych szczelin duszy Gdzie emocje kłębią w nas się niczym lawa Wciąż spragniona głębi twoich źrenic Czuję pasję co na miłość mi zakrawa

[j-august]

At some point shortly after his being hired by Walsh, he developed a strong belief that the Busang claim was exactly such a diatreme. He wrote academic-sounding papers on it and gave presentations at mining conferences. (This is normal behaviour, by the way, for the geological staff of small mining companies. It is part of the capital-raising process and by no means evidence of dishonesty in and of itself. Like the pool hall next to a saloon, however, geological presentations at investor conferences are often places where trouble starts.)

Dan Davies, Lying for Money

[wigmund]

From Earth Science Picture of the Day; January 6, 2018:

Encore - Shiprock, New Mexico

Today and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.

Photographer and Summary Author: Dr. Jack B. Share

Shiprock gives the impression of having been volcanically thrust out from the sands of the Mancos desert, but this isn't the case. Shiprock is indeed a volcano but of a class called a diatreme, having formed explosively from gas-charged magma escaping at great velocity. It possessed a crater at the surface called a maar, but erosion has long since removed it along with much of the sedimentary strata through which it erupted. What we see now is the solidified plumbing that remains called a neck and its system of magma-radiating conduits called dikes. Thus, Shiprock is a partially-exhumed, erosionally-sculpted diatreme.

The entire Shiprock volcanic complex emplaced between 28 and 19 million years ago during the Late Oligocene to Early Miocene. Its maar crater is estimated to have been located 3,250 ft (991 m) above the present day land surface of the Mancos Shale. That means Shiprock erupted through most, if not all, of the Late Cretaceous Western Interior Seaway’s sandstones and shales as well as some overlying Tertiary sandstones. The tectonic forces that created the uplift of the Colorado Plateau were likely responsible for the diatreme’s placement within the Navajo Volcanic Field and its subsequent exhumation and erosion. Photo taken on July 5, 2012.

Photo Details: Camera Maker: Canon; Camera Model: Canon EOS 7D; Focal Length: 69.0mm; Aperture: f/8.0; Exposure Time: 0.0040 s (1/250); ISO equiv: 100; Software: Adobe Photoshop Elements 5.0 Windows.

Ship Rock, New Mexico Coordinates: 36.6875, -108.836389

Related Links

Shiprock

Cretaceous Paleogeography, Southwestern US

Geology of the Colorado Plateau

Jack's Website

Student Links

A Field Trip to Maar Volcanoes

Earth Observatory

Shiprock Formation, New Mexico

[sparklestheunicorn15]

ABANDONED: Exploring the Quarry, Hornsby, NSW, Australia

Hornsby Quarry was operated by private businesses from the early 1900s until 2002, when it became unprofitable and Hornsby Shire Council was legally obliged to buy it from CSR Limited.

A decision by the Valuer-General meant the council was forced to pay more than $25 million for the site of Hornsby Quarry, though Council was able to recover $9 million during later legal proceedings.

Hornsby Quarry is historically valuable, ecologically important and visually spectacular – all within walking distance of Hornsby’s CBD. It is well-known as “the largest volcanic diatreme in the Sydney area”.

Especially significant is the east face that provides a cross-section of the diatreme, which is seen at only a few sites in the region.

The bushland on the site is also significant and includes blue gum high forest, which is listed as an endangered ecological community.

The Higgins family cemetery is also located on the site and is listed as a heritage item of state significance, with burials ranging from 1875 to 1925.

The 100-metre-deep pit looks set to receive up to 1.5 million cubic metres of dirt and rock spoil from the construction of the NorthConnex motorway tunnel.

The proposal was approved on the 18th of Jury 2016 and the the project would support Hornsby Shire Council’s plan to rehabilitate the Hornsby Quarry site into a recreational facility for the local and regional community.

Source: https://lostcollective.com/gallery/hornsby-quarry/

[soft-cheek]

tagged by @bandhoorah for another thing haha

favorite fictional characters: hhhhhhhhh there are many i still really love akaashi from haikyuu and like all of the owl boysand also saeko, uuum todoroki? love that boy....... fuck listen i cant think of things and also this list could go on for a very long time

✈️: favorite city you want to visit: i know its kinda cliche but i kinda wanna visit new york city at least once but like not by myself

💗: 3 things you like about yourself: my hair, my uuuuuuuuuuh perseverance? im out of things

💔: 2 things you want to change about yourself: my indecisiveness and like all of my mental health problems

👻: one item from your bucket list: I mean its mostly just travel stuff i wanna travel to many places because travelling is fun

🎹: instrument you want to learn: piano and guitar!

🤥: scent/smell- one you love, one you hate: i really love honeysuckle its a very calming scent and i wouldnt say hate per se but gardenia isnt good as like a perfume scent its way too strong. actual gardenias smell fine though

🎵: sound- one you love, one you hate: i like deep bass like sounds like cello and shit. or just like calming basslines in general i guess? and i have really bad misophonia so like all eating related sounds kind of drive me up the wall and make me wanna punch things

🙊: unpopular opinion: uuuuuuuuuh

💵: one thing you can’t stop buying: mother keeps giving me the bath and body works coupons she gets in the mail and as a result i end up buying a lot of bath and body works products. listen they keep giving out coupons for free shit how do i say no to that

6️⃣: 6 words to describe your tumblr: im gay and draw my ocs

💞: your first follower ever <3: its @muckkles so yknow just my sister

💪: useless skill you have: basically all of my geological knowledge, although i guess thats debatable as useless. so maybe instead my ability to like pick up any hobby and become relatively proficient at it?

🏠: could you live as a hermit?: probably although i would probably get kinda lonely without at least the internet

🤓: 3 random facts you know: many popular gemstones are really just some kind of variation of quartz with minor color or structural variants. placoderms are those Big fish youll see in a lot of paleo art with the armor like plating and despite their outward appearances most members dont actually have teeth and instead bite solely with their big armor plates. they were also considered like the tanks and apex predators of the devonian seas which is why i was super worried seeing ponyo and sosuke just kinda swimming over them in that movie. and uuuuuuuh god im out of things that arent geology related. theres a type of volcano called a diatreme thats essentially just a big cone of volcanoclastic material going into the earth and it erupts in rings onto the surrounding surface

👑: favorite Disney princess and why: still really love tiana just cause shes great but merida is also very good

ughh tagging im so bad at tagging @bitchbugboy @miraculeio @chronotaraxia @kawaiianimeredhead @unfilteredinferno