Secondary biotite alteration
WebGeneral Mineral Record Identification Commodities Primary Commodities: Gold Secondary Commodities: Copper Location Township or Area: Holmes Latitude: 48° 1' 40.02" Longitude: -80° 30' 2.69" UTM Zone: 17 Easting: 537222.023 Northing: 5319508.911 UTM Datum: NAD83 Resident Geologist District: Kirkland Lake NTS Grid: 42A02SE WebBiotite, also known, as ‘black mica’ is a rock-forming femic phyllosilicate that occurs in several igneous and metamorphic rocks. The mineral was named in honor of the French scientist Jean-Baptiste Biot, who devoted his life to study the optical properties of the micas. Structure and chemistry
Secondary biotite alteration
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Web1 Feb 1991 · Chlorite which occurs in each subzone varies systematically in Fe, Mg, and Mn content. The ratio Fe/ (Fe + Mg) increases from 0.27 at the secondary biotite zone to 0.48 … WebBiotite, a variety of mica, is common in most Cheviot igneous rocks. Whilst most of it is a primary mineral that crystallised out of the original melt, some of it is secondary, having …
Web23 Aug 2024 · Rb–Sr isotopic data of minerals (plagioclase, K-feldspar, quartz, apatite, and biotite) of the rocks with different alteration degrees are given in Table S5. Measured 87 Sr/ 86 Sr values of minerals from quartz syenite and weakly K-altered granite porphyry range from 0.710925 to 0.730017 and from 0.711408 to 0.721633, respectively. Web13 hours ago · Intrusive rock types from gabbro to diorite to monzonite and syenite have been mapped. Many of these intrusives show secondary biotite (potassic) alteration and fine quartz veins containing molybdenite or a centre line of chalcopyrite. These so called distinctive 'B veins' are classic evidence of mineralized porphyry systems.
WebIncreasing pressure, considering the range of samples, results in an increase in mean wave speed values from 4.52 to 7.86 km/s for P waves and from 2.75 to 4.09 km/s for S waves. Biotite gneiss and amphibolite exhibit the highest anisotropy with P wave anisotropy (AVp) in the ranges of ~9% to ~20%, and maximum S- wave anisotropy exceeds 10%. Web10 Apr 2024 · The formation of alkali-ultramafic-carbonatite complexes depends on several controlling factors such as: composition of the primary melt, degree of partial melting, assimilation of crustal...
Weba zone of strong potassic alteration around the margins of the stock where it overlaps with well-developed quartz-bearing biotite veins. A narrow zone of k-feldspar replacement of …
WebChlorite Replacing Biotite. In many occurrence of biotite in igneous and metamorphic rocks, chlorite is intergrown with the biotite in textures that indicate the chlorite has formed as a … othello district courtWebBiotite was reacted at 95 °C and 102 atm of CO2 for 70 h in solutions with salinities of 0, 0.1, 0.5, and 1.0 M NaCl. Then, static and dynamic water contact angles on reacted biotite basal ... othello directionsWebAlteration haloes surrounding vein systems. a Quartz along brecciated vein margin is brecciated and surrounded by a variety of sericite (Ser) and biotite (Bt) (Chevron zone). b … othello dndWeb12 Apr 2024 · Two biotite samples (about 50–60 grains) were separated from the potassic alteration zone and alunite from the lithocap in the parent porphyritic bodies, respectively, … othello dmvWebPropylitic alteration: There is a relatively sharp boundary between the propylitic and potassic alteration zones in the deep part of the deposit. Propylitic alteration is pervasive and … othello dollar treeWebAlteration refers to a change in the physical or chemical properties of rocks and minerals. In geology, alteration is a common term used to describe the transformation of rocks and … othello dixonWeb1 Jul 2024 · The term secondary distinguishes biotite, which is formed by the hydrothermal fluids, responsible for potassic and phyllic alteration from those created during the … rocket secure