accessory mineral


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accessory mineral

n.
A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.
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11): 1) the distribution of most trace elements is controlled by minerals crystallised from the residual interstitial liquid (amphibole, phlogopite and other accessory phases), excepting the HREE, that are significantly incorporated in pyroxene (~30-50%), and Ba and LREE in plagioclase (~10-30%); 2) HREE are largely controlled by amphibole, 3) LILE are mainly incorporated into phlogopite (Rb, Ba) and plagioclase (Ba), 4) Nb-Ta demonstrate a clear preference for amphibole, phlogopite and one accessory mineral (likely ilmenite), and 5) many incompatible trace elements seem to be predominantly controlled by accessory phases present in modal proportion below 1 %: LREE (apatite) and Th-U and Zr-Hf (zircon and baddeleyite) (Fig.
Backscatter SEM study demonstrates the ubiquitous presence of the CeLa-rich phosphatic accessory mineral monazite, and there is always a strong positive correlation between LREE and [P.
Arsenopyrite is an abundant accessory mineral and is common in groups of sharply developed crystals.
Limited dissolution of slowly reacting accessory mineral phases during crustal melting (monazite, zircon, allanite), which host REE and HFS elements (Zr, Y, Nb, Ta, Hf, U, Th), will, moreover, produce depleted bulk-rock trace element patterns in melts if these melts separated from the residuum on timescales shorter than the dissolution rates (Watt and Harley 1993).
Sulfur is contained in pyrite, a common accessory mineral, particulary in the more mafic rocks of the suite.
In uranium productive granites, uranium is mostly present as accessory mineral.
Insights should come from materials in the rocks that existed over the longest part of the pluton's history, and potential candidates include the complex K-feldspar megacrysts, the early accessory mineral assemblage, and the mafic microgranular enclaves.
Actinolite is a rare accessory mineral in skarns throughout the district, especially in the Bor pit.
5 - (1) accessory mineral Table 3 Physical properties Borehole core sample Particle density Bulk density number (g/[cm.

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