User talk:Rolinator

From Wikipedia, the free encyclopedia

Welcome!

Hello Rolinator, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are a few good links for newcomers:

• The five pillars of Wikipedia
• How to edit a page
• Help pages
• Tutorial
• How to write a great article
• Manual of Style

I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes (~~~~); this will automatically produce your name and the date. If you have any questions, check out Wikipedia:Where to ask a question or ask me on my talk page. Again, welcome!  Andrew_pmk | Talk 04:27, 15 December 2005 (UTC)

Hi - glad to have another geologist on board. And some of us US geologists do have a bit of deep training in economic geology :-)
Also thanks for the work on Hydrothermal circulation, that one has been on my to do list for awhile. Cheers, Vsmith 04:59, 16 December 2005 (UTC)

Contents 1 Reply from Steth 2 Chiro 3 Image copyright problem with Image:Geologyjoint.JPG 4 Alps 5 Natural hisotry 6 License tagging for Image:Anthophyllite.jpg 7 Civility and personal attacks 8 Sorely in need of geological help 9 Yes, it does help :) 10 Subducted stuff 11 Methane vs slag? 12 Gold in fluids 13 Primordial water 14 Soil science vs Engienering, Cone penetration test

[edit] Reply from Steth

My reply is here, in case you didn't see it. Thanks! Steth 20:43, 17 April 2006 (UTC)

Reply to Rolinator

[edit] Chiro

Hi .. I guess somebody must have misguided you. The problem we have with chiropractic has actually nothing to do with back pain treatment. In your case, the chiropractor is treating you like a physiotherapist and this is acceptable. The problem we have with chiro is that it claims, it can cure all diseases by treating vertebral subluxations. This is clearly a nonsense. ackoz 09:50, 21 April 2006 (UTC)

[edit] Image copyright problem with Image:Geologyjoint.JPG

Thanks for uploading Image:Geologyjoint.JPG. However, the image may soon be deleted unless we can determine the copyright holder and copyright status. The Wikimedia Foundation is very careful about the images included in Wikipedia because of copyright law (see Wikipedia's Copyright policy).

The copyright holder is usually the creator, the creator's employer, or the last person who was transferred ownership rights. Copyright information on images is signified using copyright templates. The three basic license types on Wikipedia are open content, public domain, and fair use. Find the appropriate template in Wikipedia:Image copyright tags and place it on the image page like this: {{TemplateName}}.

Please signify the copyright information on any other images you have uploaded or will upload. Remember that images without this important information can be deleted by an administrator. If you have any questions, feel free to contact me, or ask them at the Media copyright questions page. Thank you. Sue Anne 02:59, 1 May 2006 (UTC)

[edit] Alps

Hey Rolinator! I understand you are a geologist from Austria. I have just written a couple of articles on the geology of the Alps, I wondered if you could read them through for me. I am a geologist myself but I have never done research on or in the Alps. Much of what i wrote can be untrue or oversimplified, so I would appreciate it if you can look at it. Thanx! Woodwalker 09:19, 8 June 2006 (UTC)

[edit] Natural hisotry

If I remember correctly you asked me ages ago about the Natural history of Australia article I had in my user space. I've moved it to the main name space and would appreciate any help you can offer expanding the text. The main focus of the article isn't really the geology (you've got that covered :) ) but how geological and climatic events effected the flora and fauna.--Peta 08:25, 14 July 2006 (UTC)

[edit] License tagging for Image:Anthophyllite.jpg

Thanks for uploading Image:Anthophyllite.jpg. Wikipedia gets thousands of images uploaded every day, and in order to verify that the images can be legally used on Wikipedia, the source and copyright status must be indicated. Images need to have an image tag applied to the image description page indicating the copyright status of the image. This uniform and easy-to-understand method of indicating the license status allows potential re-users of the images to know what they are allowed to do with the images.

For more information on using images, see the following pages:

• Wikipedia:Image use policy
• Wikipedia:Image copyright tags

This is an automated notice by OrphanBot. If you need help on selecting a tag to use, or in adding the tag to the image description, feel free to post a message at Wikipedia:Media copyright questions. 08:04, 25 July 2006 (UTC)

Hi, I've interpreted your statement at Image:Anthophyllite.jpg as close to {{No rights reserved}}. I apologize if this was not your intention, and of course feel free to change the tag. Good alternatives include {{cc-by-sa}} and {{GFDL}}. — Laura Scudder ☎ 21:48, 8 August 2006 (UTC)

It is a photo of a rock. I have the rock. If someone can get rich off a photo of a rock, then good luck to them because I can't think of a way to get rich off anthophyllite! Rolinator 02:03, 12 August 2006 (UTC)

[edit] Civility and personal attacks

Please tone down the language and avoid personal attacks on talk pages. I have removed several uncivil comments and blatant personal attacks from Talk:Coal, both yours and the annon. editor. Please review WP:Civility and WP:No personal attacks. Wikipedia policy frowns on such language and you can be blocked from editing for it. I feel that you have a lot to add to Wikipedia, please focus on positive comments and edits and avoid future troubles. I am aware that some editors push some pretty wacky sounding ideas and POVs, but please be civil in your dealings with them. Also note that trolls usually just want to get a negative response - don't make them happy :-) Cheers, Vsmith 20:56, 20 August 2006 (UTC)

[edit] Sorely in need of geological help

Have been translating 'anorthosite' article into French Wiki. Reader frowned on An40, An60, asked for elucidation. No clue. Any idea ? Help appreciated Anne97432 05:23, 16 September 2006 (UTC)

Anne,

The An number (An#) refers to the modal percentage of anorthite within the solid solution series Anorthite-Albite (anorthite being 100% calcic (Ca) plagioclase and albite being sodic (Na)). An40 would mean a plagioclase composition of 40% anorthite and 60% albite by cation percentage. See the plagioclase page. Plagioclase, by definition, comprises >90% of anorthosites.

Most rocks with >90% plagioclase are composed of anorthite plagioclase with An# of 80+; it is very very rare to find rocks with >90% albite-normative plagioclase (these are essentially tonalite-tronhjemite granites).

Hope that helps, as although i am argumentative and would go in to bat for you, I can't speak French to save my life. Rolinator 08:51, 16 September 2006 (UTC)

[edit] Yes, it does help :)

Of course, I don't understand what it actually means, but now I can add a solid footnote, that should keep him quiet for a while while he tries to figure it out :). And if you ever need help from the French into English, be my guest ! (same pseudo on French wiki). Anne97432 09:51, 16 September 2006 (UTC)

[edit] Subducted stuff

You probably already saw my question about subduction, please wait a few days before answering. I want to see if someone else has something to contribute (and I hope it's not a Russian quotation). Try to summarize, and I'll probably need clarification on some issues but if there are delays in the exchanges it might help draw in details from others which might otherwise be missed. I'm aware of some issues in the carbon cycle and water cycle, but don't know how outdated my info is. (SEWilco 04:29, 1 October 2006 (UTC))

I'll add some stuff to that question, probably on Friday. (SEWilco 06:05, 5 October 2006 (UTC))

[edit] Methane vs slag?

I thought there was something familiar about the "Carbonate reduction" components. There are similarities with the blast furnace reduction of iron, but Scott2004 did not provide silicon so no calcium silicate could form. Silicon and calcium are both lithophiles, and I suspect where calcium is found in the mantle the more common silicon is probably also present. Would silicon being available promote many of the reactions which remove FeO from subducted crust? (SEWilco 05:48, 1 October 2006 (UTC))

I think you are starting to see where there is some problems relating artificial reactions to the mantle. But to answer your question...round about ways anyhow, I've had a read up on wustite. It is found in metamorphosed Mg-rich limestones (ie; dolomites) in conjunction with periclase (MgO); periclase typically hydrates to brucite, a common mineral in high-MgO ultramafic rocks which have been hydrated (but absent in the main from talc carbonate metamorphosed ultramafic rocks).

I see the problem of getting wustite and calcite in the mantle firstly, for prolonged periods of time, and secondly in great volume, relates to the propensity for CaO to react with silica.

In the mantle, if hypothetically you had

1. olivine + water + CO2 --> magnesite + silica +/- talc, in the presence of the carbonate reduction reaction
2. Calcite + water --> CaO + CO2 + H2O --> CaO (FeO) + CH4

is that the byproduct of reaction 1 (silica) then knocks on into reaction 2's CaO and you would, probably, get CaFeSiO_x, or probably a pyroxene. If you substitute some MgO for FeO as the catalyst you merely make a more or less fe/mg rich pyroxene.

It is theoretically possible to avoid this by using siderite, to remove the Ca from the system and stop pyroxene formation, but it then is arguable that at 1200 degrees and GPa of pressure, that excess FeO turns into olivine again. Remember that prograde metamorphism of dunite, starting from the upper crust and going down, progresses through serpentine minerals, to serp-pyoxene, serp-pyrxene-amphibole and eventually up to metamorphic olivine again once the most stable mineralogical configuration of hat composition is olivine at a given T-P condition (upper amphibolite to granulite facies, generally).

Siderite isn't a usual mantle mineral. While it is difficult to physically mix a rock such that any carbonates become mixed with silicates, making Ca silicates (pyroxene) it is more likely that small scale melting of the rock occurs during subduction, which removes volatiles and incompatible elements. This is generally manifesting as back-arc volcanism and arc volcanism, as the subducted slab is dehydrated. Thus, by the tme a hypothetical carbonate-bearing oceanic slab hits the mantle, it has been metamorphosed and subjected to dehydration reactions, melting and so on. It is unknown if a potentially wustite-calcite bearing carbonate rock could survive this sort of treatment enroute to the mantle. It would be much simpler to assume not.

This is why i keep coming back to serpentinites; they exist at T-P conditions which favor abiotic methane generation; this is observed as current day methane in metamorphosed ultramafics, and they contain the appropriate transition metals and are reduced enough to chemically promote reduced carbon. The Scott experiment is a good argument that it is plausible, but it lacks applicability to real-world processes and compositions. Rolinator 08:28, 1 October 2006 (UTC)

There's a term (which escapes me at the moment...trans*?) which is used to refer to FeO being removed from subducted slabs. I have the impression that this removal happens at less depth than would be expected for FeO-related alterations. Is it known if this removal involves formation of FeO within slab material, which then may react with things while it moves out? Or does FeO form around the outside where contact with mantle material causes reactions which cause the removal from the slab? (SEWilco 04:46, 3 October 2006 (UTC))

Dehydration metamorphism (ie; blueschist metamorphism) involves altering the subducting oceanic crust; this includes the sediment, basalt, sheeted dyke-peridotite and lower slab dunite (typical ophiolite stratigraphy), the upper portions of which are likely retrograde metamorphosed during the eruption-rifting phase (ie; hydrothermal circulation) into serpentinites.

Blueschist metamorphism generally involves loss of volatiles, conversion of amphibole-chlorite seafloor metasomatism into Na-rich metamorphic amphiboles (glaucophane etc) with a loss of Ca, and potentially a change in the FeO:Fe2O3 ratio (ie; redox change). I'm not aware of whether the subducted slab becomes more FeO rich or less.

The mantle wedge, above the subducted slab, is the beneficiary of the volatiles and Ca which are driven off the slab. Hence, calc-alkaline magmas or arc magmas are generated. The granites formed under, for instance, the Izu-Bonin arc of Japan, tend to be calc-alkaline in character, potassic, and form two series. A "reduced" ilmenite bearing suite, and a "oxidised" magnetite bearing suite.

When I looked into granite gold metallogenesis, the ilmenite-magnetite divide is important because, the redox state of a granite is critical for which elements are able to be concentrated into ore deposits. However, I say "reduced" granites because both suites sit above the Wustite-Magnetite redox buffer and below the QFM redox buffer. The transition to ilmenite from magnetite is, from the work of various authors, a contribution from subducted slab sediment, generally rich in reduced carbon (graphite is reported from some ilmenite-series granites, which are the S-type of Chappell and White), a contribution from back-arc deplated mantle (which produced more Ti-rich melts, be they boninite basalt or granite) and a contribution from metasomatised mantle wedge and slab melts. The speciation between ilmenite and magnetite is thus complex, not just related to FeO and the slab itself.

This breakdown of the two granites implies that redox conditions and contributions of oxidised vs reduced materials changes with distance from the subduction zone. But it isn't really well understood, and it is also difficult to say whether the redox change in the granites is caused by the slab or what melts above the slab as it heats up. I would hedge my bets on the latter. But again, these two granite suites have different states of oxidation relative to one another within the confines of the two redox buffers. Also, the fact you can get graphitic granite argues that whenever organic detritus interacts with magma, it is equally likely to fix in the ultra-reduced conditions, and may actually prevent methane generation due to lack of ability to drive the bulk chemistry into conditions which change carbon from graphite to methane (ie; its so reduced that it takes a long while to push it into methane-carbon dioxide redox compositions). Then again, these granites are derived from melted sediments, so clearly carbon in them is entrained in solid form, not percolating through as CO2 gas.

In fact, if a granite is reduced enough, it will force all FeO into silicates, preventing any Fe oxide formation (lets say pyroxene and amphibole), which also cancels out any potential methanogenesis reactions involving wustite. Whether this means that slab melts can't form wustite-carbonate during subduction is another problem, because so far there's no evidence of this actually happening. In theory, yes. But there is no evidence. The only known carbonatite volcano also sits in a rift zone, so if a carbonate sequence melts (lets say to provide a reduced ilmenite granite), we are on current evidence unlikely to see it manifest as a carbonatite. I don't know if that answers anything, but the redox state of basalt melts behind subduction zones is something I'm not at all familiar with, and that is much deeper melting in much more mafic magmas. Rolinator 03:52, 6 October 2006 (UTC)

[edit] Gold in fluids

Unrelated to other discussions, I point out this URL because it mentions gold in fluids in the crust. Thought you might be interested, although it's likely you already know of it. http://volcanoes.usgs.gov/staff/jlowenstern/other/volatile_reviews.html (SEWilco 05:05, 8 October 2006 (UTC))

Thanks, but you are right. Lowenstern's stuff is known to me. Thanks for the thoughts. Rolinator 00:14, 12 October 2006 (UTC)

[edit] Primordial water

Is there a reason you blanked Primordial water rather than moving it? Do you think the content is worth moving to a better title, or redirecting to a similar term? Please reply at Talk:Primordial water. By the way, there's a deletion process you can use if there are pages you think need permanent deleting. Angela. 04:07, 19 October 2006 (UTC)

Consider an AfD. I'll be happy to help you start one. - CrazyRussian talk/email 05:34, 19 October 2006 (UTC)

A brief response as I am @ work; I think (?) I explained on the talk; there is no practicable scientific method of ascertaining if water from the mantle is primordial in a cosmochemical sense; only the volatiles carried with the water. Mediate the crap out of it if you want in the meantime, I'll be back in from fieldwork in a week. It was also a topic AFAIK with only a couple of links, one of which was hydrothermal vent, where it was used in isolation and without any basis in fact aside from the point raised directly above.Rolinator 05:09, 20 October 2006 (UTC)

[edit] Soil science vs Engienering, Cone penetration test

Hi! I'm a little curious why you changed Cone penetration test from a geology-stub to a soil-science stub? Soil science, in my experience, generally refers to a branch of agronomy, which the CPT is not used for (usually). Argyriou (talk) 17:25, 29 October 2006 (UTC)

There is very little to no useful data to be gleaned from the majority of geological science in knowing how compacted soil is; pedologists would probably use the CPT more than someone studying volcanic rocks or metamorphism, yes? Its either that or engineering, civil or otherwise. I have been finding that geology-stub is applied to anything to do with anything at all and, being a geo, tend to try to find a substitute for things which aren't anything I have heard of in my geology experience. Like this, which is probably a civil engineering test. Cheers. Rolinator 23:05, 29 October 2006 (UTC)

Cone penetration test is definitely an engineering test; and the article is tagged as an engineering-stub. The CPT is sometimes useful in engineering geology, and as it can be fitted with shear and pressure wave receivers, can also be useful in seismology, but it is primarily for engineering. I'll remove the soil-science-stub, and leave it as only an engineering-stub. Argyriou (talk) 23:18, 29 October 2006 (UTC)

Every so often I go through the geology stubs and weed them down into minerals, soils, engineering, skiing, etc, because I figure that if an article is stubbed properly then it will reach an audience who knows how to expand it. So thanks. Rolinator 23:20, 29 October 2006 (UTC)