Discover the world's scientific knowledge
With 135+ million publication pages, 20+ million researchers and 1+ million questions, this is where everyone can access science
You can use AND, OR, NOT, "" and () to specify your search.
Does some give me some suggestion? Some basic rocks with positive εNd(t) but a large range εHf(t) (from negative to positive; most are negative )?
Hi, I would like to know about two different cases:
1. Granite formation condition (Temp and also pressure if possible) from WDXRF data (whole rock).
2. P-T-t path construction from WDXRF data (whole rock) of meta basalts.
We don't have probe data (no mineral chemistry), but detailed petrographic studies give all mineral constituents.
Can we guess specific reactions from presence or absence of specific minerals? How to understand applicability of such thermobarometric reactions from mineral constituents?
If possible, some standard work sheets or softwere, standard plots, standard table/chert may be shared for help in understanding.
Apart from applying the technique in fold thrust belts which are deformed in a thin skinned manner, can we also use this in any other tectonic regime?
I have some elemental data - pre and post treatment.
If the paired sample t test fails (say if the p value is high (3 or 4))
what tests suggests?
It is well established that alkaline rock formed at high temperature regime but I calculated the temperature which is round about 630-700 C which quite low for such rocks . I also cross checked from zircon saturation temperature which almost same effect now I 'm quite confusing why temperature is so low .These rocks are enriched in volatiles e.g SO3 , F , P and calcite .Can volatiles effect temperature? If yes how ? Any good articles explain well .Thanks
Obviously, in a creep test, the data of E and CE are slightly different from each other in Abaqus.
I know, E is strain and CE is creep strain.
I just want to know the difference between these two and how abaqus calculate these two variables if anyone can give me the directory of the documentation that illustrate this part?
Thanks in advance!
Omphacitites are high-pressure metamorphic rocks related to oceanic subduction. As the name suggests, they contain mainly the mineral omphacite, a Na-rich clinopyroxene, without the mineral garnet. Omphacitites occur as veins, knockers or pods within metasedimentary rocks (schist and marbles) sharing a common subduction history. Usually, thermobarometric constrains for the high-pressure event are obtained from the matrix rocks which contain a more diverse mineral assemblage such as garnet, amphibole, micas, etc. However, in the case when the host rock is a marble (a metamorphic rock mainly made of dolomite and calcite, and therefore chemically homogeneous), is there a method to estimate a minimum P-T conditions for the HP event? Aside from the carbonates the other different mineral observed in the marble is a Cr-rich phengite. I have the chemical compositions of both omphacite and phengite, but I have not found a reference that could use these data for estimating the P-T conditions. Any thoughts?
Will appreciate very much if anyone can send me an excel spreadsheet for estimating P-T-depth of mantle rocks using mineral chemistry of olivine, opx, cpx and spinel
I want to generate a constant high relative humidity (90-100% in a desiccator) for a research study on mudrocks. There is the possibility to use different saturated salt solutions. But the range of the relative humidity produced by the solutions I found is too large.
Is it possible to dilute a saturated salt solution to create a higher relative humidity? Alternatives are welcome.
Rayleigh Waves travel through our Earth's crust anywhere from 2.9 to 14.9 times the speed of sound. Rayleigh waves from impacts such as the K/pG Impact Event are known to be at least 1 meter tall for thousands of miles.Waves of rock and ground that poke-up above our crust at heights of 1+ meters at super-sonic speeds would have built up a high pressure (and heat) atmospheric shock-wave in front of the wave(s) as all solid objects (the sheer face of the wave(s),in this case, suffices as a solid object) that travel at super-sonic speeds through our atmosphere.
If anyone can explain how this shock-wave did not exist, I am very eager to hear about it.
Deleted research item The research item mentioned here has been deleted