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2 replacement of primary plagioclase by secondary k

2. REPLACEMENT OF PRIMARY PLAGIOCLASE BY SECONDARY

2. REPLACEMENT OF PRIMARY PLAGIOCLASE BY SECONDARY K-FELDSPAR AND MYRMEKITE Lorence G. Collins email: [email protected] November 21, 1996; revised February 17, 1997 The following illustrations in this presentation show four photomicrographs of cathodoluminescent images, two black-and-white scanning electron microscope

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Myrmekite Wikipedia

In the second variety Na- and Ca-bearing fluids truly act together. This leads via the replacement of primary K-feldspar (perthitic and non-perthitic microcline) to the formation of plagioclase (albite or oligoclase) and in certain places also to the formation of myrmekite.

MYRMEKITE

2. Replacement Of Primary Plagioclase By Secondary K-feldspar And Myrmekite. 3. Microscopic And Megascopic Relationships For Myrmekite-bearing Granitic Rocks Formed By K-metasomatism. 4. Myrmekite Formed By Ca-metasomatism. 5. Myrmekite Formed By Exsolution? 6. Myrmekite As A Clue To Metasomatism On A Plutonic Scale; Origin Of Some Peraluminous

42. A study of intergrowth textures and their possible

headings: (1) simultaneous or direct crystallization, (2) replacement of K-feldspar by plagioclase, (3) replacement of plagioclase by K-feldspar, (4) solid-state exsolution, (5) recrystallizing quartz involved with blastic plagioclase, and (6) combinations of some of 1-5 hypotheses. Collins (1988, p. 2

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The replacement of plagioclase feldspars by albite

Jun 24, 2009 Oligoclase and labradorite crystals have been experimentally replaced by albite in an aqueous sodium silicate solution at 600°C and 2 kbars. The replacement is pseudomorphic and is characterised by a sharp chemical interface which progresses through the feldspar while preserving the crystallographic orientation. Reaction rims of albite, up to 50 μm thick, can be readily achieved within

Cited by: 150

The replacement of plagioclase feldspars by albite

The replacement of plagioclase feldspars by albite: observations albitisation and secondary ore mineralisation which is common in nature. primary mechanism of mineral replacement reactions in the presence of a fluid phase (Putnis 2002). Recently, several

Impact-induced replacement of plagioclase by K-feldspar in

Nov 16, 2005 Impact-induced replacement of plagioclase by K-feldspar in granitoids and amphibolites at the Kärdla Crater, Estonia. in addition to medium- to coarse-grained microcline present in primary rocks. SEM, EDS and EPMA studies reveal that the main secondary minerals are orthoclase, replacing plagioclase in granites and amphibolites, and

(PDF) Hydrothermal alteration of plagioclase in granitic

Replacement of plagioclase by K-feldspar occurs in red-stained zones, which have developed close to thin fractures owing to the precipitation of tiny Fe-oxide pigment particles within the altered

The replacement of plagioclase feldspars by albite

The replacement of plagioclase feldspars by albite: observations albitisation and secondary ore mineralisation which is common in nature. primary mechanism of mineral replacement reactions in the presence of a fluid phase (Putnis 2002). Recently, several

Hydrothermal alteration of plagioclase and growth of

May 30, 2002 Secondary plagioclase can be distinguished from igneous plagioclase by the lower K 2 O content in the secondary Na-feldspar. This is shown in a graph displaying log K 2 O content versus anorthite content of feldspars from 800 m depth where micrometer-sized Na-feldspar and K-feldspar crystals clearly deviate from the magmatic trend ( Fig. 5b ).

Hydrothermal anorthitization of plagioclase within the

Oct 01, 1998 Most primary plagioclase in the vein halos is completely replaced by secondary plagioclase, except near the outer edge of halos where the replacement is incomplete. Secondary cathodoluminescent plagioclase varies from An 55 to An 78,which is considerably more calcic than the secondary feldspars reported previously for the sheeted dikes of

(PDF) Hydrothermal alteration of plagioclase and growth of

(a) sample from 650 m, plagioclase is partially altered K-feldspar formed at the K-rich rim of labradorite during to smectite, whereas no secondary Na-feldspar dissolution of labradorite and formation of Na-feldspar. can be identi¢ed with the optical microscope or Clay minerals are also assumed to be a source of K, whereas the microprobe.

(PDF) Mechanism of Plagioclase Albitization

Plagioclase and K-feldspars show various degrees of albitization. The occurrence and processes leading to the formation of albite in feldspar grains in the San Joaquin basin have been well

(PDF) A study of intergrowth textures and their possible

Formation of flame perthite can be explained by replacement reaction mechanism (Na-K exchange) between K-feldspar and plagioclase under low to moderate differential stress condition during rapid

Replacement of pyroxene by hornblende, isochemically

Jan 01, 1984 KoA6Nao.29Ca1.89Mg2.s4Fe 2.0~Fe o.oaA12.04S16.ssTlo.os022 (oH)2. The more primary hornblende* has a significantly higher Ti content (causing apparently the brownish tint), while the Na and K content also seem to be higher. Table 2 shows the variance of

New Guidelines for Potassium Replacement in Clinical

The primary outcome of the meeting was the development of guidelines for potassium replacement therapy. These guidelines represent a consensus of the Council members and are intended to provide a general approach to the prevention and treatment of hypokalemia. X.

Tax Breaks for Second-Home Owners Investopedia

Jan 01, 2021 Internal Revenue Service. "2019 Instructions for Form 8824, Like-Kind Exchanges," Pages 1–2. Accessed June 18, 2020. Internal Revenue Service. "Rev. Proc. 2008-16," Pages 3–5. Accessed June 18

Can you piggyback critical meds like IV Potassium or Mag

Dec 01, 2007 Pump #2: primary line 0.9 NS this line was attached via Y-site. Dec 14, 2007. maybe I am not understanding you but here is what we do. a K or Mg rider is always run as a secondary. With the primary either NS, D5W, or some other plain chrystaloid. If you need to run abx or some other med you run it on a seperate line an a seperate pump

(PDF) Hydrothermal alteration of plagioclase in granitic

Barium is an important component in replacement of plagioclase by K-feldspar were hydrothermal systems, and Ba-feldspar (celsian) can thus strongly controlled by the mineralogical composition form solid solution with orthoclase in secondary K-feldspar of

Ecological succession Ecology Biology (article) Khan

Primary vs. secondary succession. The idea of a climax community. Succession as progressive change in an ecological community. Primary vs. secondary succession. The idea of a climax community. If you're seeing this message, it means we're having trouble loading external resources on our website.

Impact-induced replacement of plagioclase by K-feldspar in

Nov 16, 2005 Impact-induced replacement of plagioclase by K-feldspar in granitoids and amphibolites at the Kärdla Crater, Estonia. in addition to medium- to coarse-grained microcline present in primary rocks. SEM, EDS and EPMA studies reveal that the main secondary minerals are orthoclase, replacing plagioclase in granites and amphibolites, and

(PDF) Hydrothermal alteration of plagioclase in granitic

Barium is an important component in replacement of plagioclase by K-feldspar were hydrothermal systems, and Ba-feldspar (celsian) can thus strongly controlled by the mineralogical composition form solid solution with orthoclase in secondary K-feldspar of

Hydrothermal alteration of plagioclase and growth of

Low-temperature fluid alteration of plagioclase to K-feldspar has been reported in several igneous settings (Larsson et al., 2002; Morad et al., 2010), but the replacement of plagioclase by K

(PDF) Mechanism of Plagioclase Albitization

Plagioclase and K-feldspars show various degrees of albitization. The occurrence and processes leading to the formation of albite in feldspar grains in the San Joaquin basin have been well

The replacement of plagioclase feldspars by albite

BSE images and combined EDX analyses of cross sections throughout the crystals indicate pseudomorphic replacement of the original plagioclase by an albite-rich feldspar composition (Fig. 2). The replacement advanced from the grain surfaces and along pre-existing cracks inwards into the crystal, so that the product albite is located in a rim

Petrogenesis of scapolite-rich gabbro from the alkaline

Nov 15, 2020 Furthermore, not only do the scapolite from Cho Don appear as the primary magmatic phase, but it also locally breaks down into green-luminescent, Ca-rich plagioclase, which is frequently accompanied by vermicular calcite (Fig. 3C and G) consuming the excess of Ca 2+ liberated during alteration according to the reaction Ca 4 Al 6 Si 6 O 24 CO 3

Ecological succession Ecology Biology (article) Khan

Primary vs. secondary succession. The idea of a climax community. Succession as progressive change in an ecological community. Primary vs. secondary succession. The idea of a climax community. If you're seeing this message, it means we're having trouble loading external resources on our website.

Can you piggyback critical meds like IV Potassium or Mag

Dec 01, 2007 Pump #2: primary line 0.9 NS this line was attached via Y-site. Dec 14, 2007. maybe I am not understanding you but here is what we do. a K or Mg rider is always run as a secondary. With the primary either NS, D5W, or some other plain chrystaloid. If you need to run abx or some other med you run it on a seperate line an a seperate pump

New Guidelines for Potassium Replacement in Clinical

The primary outcome of the meeting was the development of guidelines for potassium replacement therapy. These guidelines represent a consensus of the Council members and are intended to provide a general approach to the prevention and treatment of hypokalemia. X.

Tax Breaks for Second-Home Owners Investopedia

Jan 01, 2021 Internal Revenue Service. "2019 Instructions for Form 8824, Like-Kind Exchanges," Pages 1–2. Accessed June 18, 2020. Internal Revenue Service. "Rev. Proc. 2008-16," Pages 3–5. Accessed June 18

Skeletal quartz and dendritic biotite: Witnesses of

Dec 01, 2019 Albite is a widespread secondary mineral phase, which occurs as thin rims around plagioclase, or veinlets along grain boundaries between the matrix K-feldspar grains (Fig. 13a); it also replaces primary plagioclase crystals, forming patchy zoning in association with K-feldspar and muscovite (Fig. 13c, f).

Amenorrhea: An Approach to Diagnosis and Management

Jun 01, 2013 A detailed history, examination, and laboratory analysis will identify most causes .1, 2, 6, 7, 11 In all cases, pregnancy should first be excluded.1, 2, 6, 7, 11 The initial evaluative steps are

Hemophagocytic lymphohistiocytosis Wikipedia

Hemophagocytic lymphohistiocytosis (HLH), also known as haemophagocytic lymphohistiocytosis (British spelling), and hemophagocytic or haemophagocytic syndrome, is an uncommon hematologic disorder seen more often in children than in adults. It is a life-threatening disease of severe hyperinflammation caused by uncontrolled proliferation of activated lymphocytes and macrophages,

SECONDARY AIR INJECTION CHECK VALVE REPLACEMENT

SECONDARY AIR INJECTION CHECK VALVE REPLACEMENT AND LOCATION CHEVROLET CRUZE, SONIC Check Valve: https://amzn.to/2XkxafGIn this video we will show you how t...