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Tonalite–trondhjemite–granodiorite (TTG) rocks are intrusive rocks with typical granitic composition (quartz and feldspar) but containing only a small portion of potassium feldspar. Tonalite , trondhjemite , and granodiorite often occur together in geological records , indicating similar petrogenetic processes. [ 1 ]
Trondhjemite is an orthoclase-deficient variety of sodium-rich tonalite with minor biotite as the only mafic mineral, named after Norway's third largest city, Trondheim. [7] Tonalites, together with granodiorites, are characteristic of calc-alkaline batholiths formed above subduction zones. [8]
Trondhjemite is a leucocratic (light-colored) intrusive igneous rock. It is a variety of tonalite in which the plagioclase is mostly in the form of oligoclase . [ 1 ] Trondhjemites that occur in the oceanic crust or in ophiolites are usually called plagiogranites .
A surface use agreement (SUA) is a contract between a property owner and a mineral rights holder that dictates how the mineral rights are to be developed. [20] Meaning, when mineral rights are extracted by a company that does not own the property above where the minerals are located, the company has the legal right to extract those minerals ...
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MSNBC is negotiating pay cuts with night anchors Joy Reid and Stephanie Ruhle as the cable channel nosedives in the ratings after the election, according to a report.. Rachel Maddow, arguably the ...
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Bringing home a new baby is always a special time, and bringing one home during the holidays makes it even more special. Chase and Chester and Golden Retrievers that recently got a new baby sister ...