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Статті в журналах з теми "Albite alteration"
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Ernowo, Ernowo, Arifudin Idrus, and Franz Michael Meyer. "Elemental Gains and Losses during Hydrothermal Alteration in Awak Mas Gold Deposit, Sulawesi Island, Indonesia: Constraints from Balanced Mineral Reactions." Minerals 12, no. 12 (December 17, 2022): 1630. http://dx.doi.org/10.3390/min12121630.
Повний текст джерелаАнотація:
Hydrothermal gold mineralization is commonly associated with metasomatic processes resulting from interaction of hostrock with infiltrating hot aqueous fluids. Understanding of the alteration mechanism requires quantification of element changes in altered rock, relative to the unaltered or least-altered rock, representing the protolith. Balanced mineral reactions are used to gain quantitative insight into the alteration process associated with gold mineralization at the Awak Mas deposit. Three representative samples were carefully selected from the least-altered pyllite and the two alteration zones bordering the mineralization. Mineral mode, textural features, and mineral compositions were studied by microscopy and electron microprobe analyzer (EMPA). Quantitative modal analysis was performed with a Quanta 650 F QEMSCAN® system. The hydrothermal alteration sequence around the mineralization starts with the proximal albite–ankerite–pyrite alteration zone via the distal albite–chlorite alteration zone to the least-altered phyllite wall-rock. Balanced mineral reaction calculations were performed to evaluate elemental gains and losses. Most noticeable is the addition of Si, Na and Ca to each alteration zone. This alteration is represented by the almost complete replacement of muscovite by albite. The addition of Fe and S was highest in the albite–ankerite–pyrite alteration zone. Alteration of the least altered phyllite to the albite–chlorite zone involved a mass increase of 14.5% and a neglectable volume increase of 0.6%. The mass and a volume increase from the least altered phyllite to the albite–ankerite–pyrite zone was 40.5% and 0.47%, respectively. The very low volume change during alteration is also corroborated by the textural preservation indicating isovolumetric metasomatic reactions. The replacement of muscovite by albite may have had an important effect on the change of the rock failure mode from ductile to brittle, with consequences for the focusing of fluid flow.
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Lee, Martin R., Kim A. Waldron, and Ian Parsons. "Exsolution and alteration microtextures in alkali feldspar phenocrysts from the Shap granite." Mineralogical Magazine 59, no. 394 (March 1995): 63–78. http://dx.doi.org/10.1180/minmag.1995.59.394.06.
Повний текст джерелаАнотація:
AbstractAlkali feldspar phenocrysts (bulk composition Or75.0Ab24.6An0.4) in the subsolvus Shap granite comprise a fine-scale mixture of subregular pristine crypto- and micro-perthites with altered, micropore-rich feldspar with irregular microstructures. The regular perthites are strain-controlled intergrowths of Albite and/or Periclinetwinned albite exsolution lamellae within tweed orthoclase. The microperthites formed at ⩽ 590°C by heterogeneous nucleation of thin albite films which coarsened to > 1 µm length. Cryptoperthites developed at < 400°C by homogeneous nucleation of sub-µm long platelets between films. Platelets are coherent, but the coarser microperthite lamellae are semi-coherent, with pairs of misfit dislocations sub-regularly spaced along the albite-orthoclase interface. As much as 30% of any one feldspar crystal is turbid, a result of the formation of numerous µm to sub-µm sized micropores during deuteric alteration. In some areas, deuteric fluids gained access to the interior of feldspar crystals by exploiting semi-coherent film lamellae. Albite was selectively dissolved and micropore-rich irregular microcline was reprecipitated in its place. In other parts of the feldspars deuteric recrystallization completely cross-cuts the pristine microtextures and patch perthites have formed. These are coarse, incoherent to semi-coherent intergrowths of irregular microcline (replacing tweed orthoclase) and Albite-twinned albite. The deuteric reactions occurred at < 400°C; the main driving force for dissolution and reprecipitation was decrease in the elastic strain energy at the coherent interfaces of crypto-and micro-perthite lamellae, and the recrystallization of tweed orthoclase to irregular microcline.
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Almeida, Delia Del Pilar M. de, Vitor P. Pereira, Adriane Machado, Henrique Zerfass, and Ricardo Freitas. "Late sodic metasomatism evidences in bimodal volcanic rocks of the Acampamento Velho Alloformation, Neoproterozoic III, southern Brazil." Anais da Academia Brasileira de Ciências 79, no. 4 (December 2007): 725–37. http://dx.doi.org/10.1590/s0001-37652007000400012.
Повний текст джерелаАнотація:
A mineralogical study was carried out in mafic and felsic volcanic rocks of the Acampamento Velho Alloformation at Cerro do Bugio, Perau and Serra de Santa Bárbara areas (Camaquã Basin) in southern Brazil. The Acampamento Velho bimodal event consists of two associations: lower mafic at the base and upper felsic at the top. Plagioclase and alkali-feldspar were studied using an electronic microprobe, and magnetite, ilmenite, rutile, illite and alkali-feldspar were investigated through scanning electron microscopy. The rocks were affected by a process of late sodic autometasomatism. In mafic rocks, Ca-plagioclase was transformed to albite and pyroxenes were altered. In felsic rocks, sanidine was partially pseudomorphosed, generating heterogeneous alkali-feldspar. In this association, unstable Ti-rich magnetite was replaced by rutile and ilmenite. In mafic rocks, the crystallization sequence was: (1) Ti-rich magnetite (?), (2) pyroxene and Ca-plagioclase, (3) albite (alteration to Ca-plagioclase), (4) sericite, chlorite and calcite (alteration to pyroxene), and kaolinite (alteration to plagioclase/albite). In felsic rocks: (1) zircon, (2) Ti-rich magnetite, (3) sanidine, (4) quartz. The introduction of late Na-rich fluids, generated the formation of (5) heterogeneous alkali-feldspar, (6) ilmenite and rutile from the Ti-rich magnetite, (7) albite in the spherulites. Finally, alteration of sanidine, vitroclasts and pumice to (8) illite.
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Kawano, Motoharu. "Growth of Smectite from Leached Layer During Experimental Alteration of Albite." Clays and Clay Minerals 42, no. 1 (1994): 7–17. http://dx.doi.org/10.1346/ccmn.1994.0420102.
Повний текст джерела
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Μάραντος, Ι., Γ. Κοσιάρης, Σ. Καραντάση, Β. Περδικάτσης та Γ. Χρηστίδης. "PRELIMINARY STUDY OF ALTERED TERTIARY VOLCANICLASTIC ROCKS IN THE AREA OF ASPROULA , ΝΕΑ SANTA, RODOPI PERFECTURE, THRACE, NE GREECE". Bulletin of the Geological Society of Greece 36, № 1 (1 січня 2004): 454. http://dx.doi.org/10.12681/bgsg.16736.
Повний текст джерелаАнотація:
The area of Asproula is part of the Tertiary volcanosedimentary basin of Komotini, West Thrace. The geological structure of the area comprises metamorphic rocks of the Rhodope zone and Tertiary volcano-sedimentary rocks. The Tertiary sequence consists of three units: a) the lower unit, in contact with metamorphic rocks comprises sandstones-siltstones b) a unit, which comprises andesitic tuffs and c) a highe: unit consisting of dacitic-rhyodacitic volcaniclastics alternated with tuffites, siltstones, sandstones and marls forming a sequence about 150m thick. The acid volcaniclastics have been altered to clay minerals (mixed layer l-S, kaolinite, ), analcime, albite, and mordenite. The andesitic tuffs are slightly altered to smectite. Moreover in the andesitic tuffs laumontite and scolecite have formed along faults . According to the distribution of characteristic alteration minerals a zonation of alteration has been distinguished. Hence, the lower part of dacitic- ryodacitic tuffs has been altered to analcime + mixed layer l-S + quartz or albite + l-S + quartz, whereas in the upper part the volcaniclastics have been altered to kaolinite or mordenite. In the upper part of the dacitic-rhyodacitic sequence mordenite occurs in distinct thin pyroclastic flows (<5m thickness). The mode of succession of the mordenitic-kaolinitic alteration in the upper parts of the volcaniclastic sequence suggests rapid change in the chemistry of the mineral forming fluids. It is possible that temperature controlled the formation of mordenite. The presence of R1 ordered mixed layer l-S throughout the stratigraphie sequence suggests that the temperature during alteration exceeded 90° C. Moreover, the appearance of neo-formed albite in the lower part of the succession suggests that the temperature during alteration exceeded 120° C, in the lower parts of the formation.
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Kempe, U., J. Götze, S. Dandar, and D. Habermann. "Magmatic and metasomatic processes during formation of the Nb-Zr-REE deposits Khaldzan Buregte and Tsakhir (Mongolian Altai): Indications from a combined CL-SEM Study." Mineralogical Magazine 63, no. 2 (April 1999): 165–77. http://dx.doi.org/10.1180/002646199548402.
Повний текст джерелаАнотація:
AbstractCathodoluminescence (CL) imaging and spectroscopy, as well as backscattered electron imaging, were used to assign the occurrence of several mineral phases and rock structures in altered nordmarkites and calcite-bearing granites from the Nb-Zr-REE deposits from Khaldzan Buregte and Tsakhir (Mongolian Altai) to three events: (1) intrusion of barren nordmarkites; (2) intrusion of small bodies of calcite-bearing granites with metasomatic alteration of the wall-rocks; and (3) alteration by F-rich fluids.Unusual red and yellow CL caused by Fe3+ and Mn2+ emission centres were detected in microcline and albite. Fe3+ centres were also established (along with others) in quartz, zircon, and possibly in fluorite.Magmatic and metasomatic rock structures and internal structures of the minerals coexist in the samples. The primary magmatic features were in part preserved during alteration. In contrast, the internal and the centre structures may be changed during alteration even in non-replaced mineral phases. Euhedral minerals may be formed by secondary processes as shown for lath-shaped albite. The occurrence of pseudomorphs, the inheritance of elements during replacement, and the mechanical effects of secondary minerals on earlier mineral phases during metasomatic growth are proposed as criteria for the reconstruction of the mineral succession in altered rocks. Snowball structures may be formed as a result of metasomatic alteration rather than as a magmatic intergrowth.
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Calder, Michael F., Zhaoshan Chang, Antonio Arribas, Alina Gaibor, Peter Dunkley, Jeffrey Pastoral, Kalin Kouzmanov, Carl Spandler, and Jeffrey W. Hedenquist. "High-Grade Copper and Gold Deposited During Postpotassic Chlorite-White Mica-Albite Stage in the Far Southeast Porphyry Deposit, Philippines." Economic Geology 117, no. 7 (November 1, 2022): 1573–96. http://dx.doi.org/10.5382/econgeo.4940.
Повний текст джерелаАнотація:
Abstract Ninety-eight underground diamond holes (~102 km) drilled by Far Southeast Gold Resources Inc. at the Far Southeast porphyry Cu-Au deposit, Philippines, from 2011 to mid-2013, provide a three-dimensional exposure of the deposit between 700- and –750-m elevation, with surface at ~1,400-m elevation. Far Southeast contains an inferred resource of 891.7 million tonnes (Mt) averaging 0.7 g/t Au and 0.5 wt % Cu, equivalent to 19.8 Moz Au and 4.5 Mt Cu. This contribution reports the spatial and temporal distribution of alteration and mineralization at Far Southeast, notably a white-mica–chlorite-albite assemblage that formed after early secondary biotite and before late quartz–white-mica–pyrite alteration and that is associated with the highest copper and gold grades. Alteration assemblages were determined by drill core logging, short-wavelength infrared (SWIR) spectral analysis, petrographic examination, and a quantitative evaluation of materials by scanning electron microscopy (QEMSCAN) study. Alteration is limited around sparse veins or pervasive where vein density is high and the alteration halos coalesce. The alteration and mineralization zones with increasing depth are as follows: (1) the lithocap of quartz-alunite–dominated advanced argillic-silicic alteration that hosts part of the Lepanto high-sulfidation Cu-Au epithermal deposit (mostly above ~700-m elevation), (2) an aluminosilicate-dominated zone with coexisting pyrophyllite-diaspore ± kandite ± alunite and white mica (~700- to ~100-m elevation), (3) porphyry-style assemblages characterized by stockwork veins (below ~500-m elevation), (4) the 1 wt % Cu equivalent ore shell (~400- to –300-m elevation), and (5) an underlying subeconomic zone (about –300- to –750-m elevation, the base of drilling). The ore shells have a typical bell shape centered on a dioritic intrusive complex. The paragenetic sequence of the porphyry deposit includes stage 1 granular gray to white quartz-rich (± anhydrite ± magnetite ± biotite) veins with biotite-magnetite alteration. These were cut by stage 2 lavender-colored euhedral quartz-rich (± anhydrite ± sulfides) veins, with halos of greenish white-mica–chlorite-albite alteration. The white mica is largely illite, with an average 2,203-nm Al-OH wavelength position. The albite may reflect the mafic nature of the diorite magmatism. The quartz veins of this stage are associated with the bulk of copper deposited as chalcopyrite and bornite, as well as gold. Thin Cu sulfide (chalcopyrite, minor bornite) veins with minor quartz and/or anhydrite (paint veins), with or without a white-mica halo, also occur. These veins were followed by stage 3 anhydrite-rich pyrite-quartz veins with white-mica (avg 2,197 nm, illite)–pyrite alteration halos. Combined with previous studies, we conclude that this porphyry system, including the Far Southeast porphyry and Lepanto high-sulfidation Cu-Au deposits, evolved over a period of 0.1–0.2 m.y. Three diorite porphyry stocks were emplaced, and by ~1.4 Ma biotite-magnetite–style alteration formed with quartz-anhydrite veins and deposition of ≤0.5% Cu and ≤0.5 g/t Au (stage 1); coupled with this alteration style, a barren lithocap of residual quartz with quartz-alunite halo plus kandite ± pyrophyllite and/or diaspore formed at shallower depth (>700-m elevation). Subsequently, lavender quartz and anhydrite veins with bornite and chalcopyrite (high-grade stage, avg ~1 wt % Cu and ~1 g/t Au) and white-mica–chlorite-albite halos formed below ~400-m elevation (stage 2). They were accompanied by local pyrite replacement, the formation of hydrothermal breccias and Cu sulfide (paint) veins. Stage 2 was followed at ~1.3 Ma by the formation of igneous breccias largely along the margins of the high-grade zones and stage 3 pyrite-quartz-anhydrite ± chalcopyrite veins with white-mica (mostly illitic) halos. At shallower depths in the transition to the base of the lithocap, cooling led to the formation of aluminosilicate minerals (mainly pyrophyllite ± diaspore ± dickite) with anhydrite plus high-sulfidation-state sulfides and pyrite veinlets. Consistent with previous studies, it is likely that the lithocap-hosted enargite-Au mineralization formed during this later period.
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Bérubé, Charles L., Gema R. Olivo, Michel Chouteau, and Stéphane Perrouty. "Mineralogical and textural controls on spectral induced polarization signatures of the Canadian Malartic gold deposit: Applications to mineral exploration." GEOPHYSICS 84, no. 2 (March 1, 2019): B135—B151. http://dx.doi.org/10.1190/geo2018-0404.1.
Повний текст джерелаАнотація:
Applications of the spectral induced polarization (SIP) method to mineral exploration are limited by our knowledge of the relationships among rock texture, mineral composition, and electrical properties. Laboratory SIP responses were measured on rock samples from the Canadian Malartic gold deposit. Field SIP responses were also measured at the outcrop scale, along a profile that intersects a well-studied mineralized zone. The mineralogy and the texture of sedimentary rocks from this deposit were quantitatively determined with mineral liberation analysis. A systematic decrease (Pearson [Formula: see text]) in total chargeability with increasing fraction of the sulfide mineral interfaces associated with feldspar minerals (namely, K-feldspar and albite) was observed. On the other hand, total chargeability increased with the fraction of sulfide mineral interfaces associated with carbonates and micas (Pearson [Formula: see text]). At Canadian Malartic, proximal alteration in the mineralized zones is marked by rocks that lack a foliation plane and that were subjected to pervasive K-feldspar, albite, and pyrite alteration. In contrast, distal alteration in sedimentary rocks is marked by biotite, albite, carbonate, and pyrite that are oriented along the regional [Formula: see text] foliation. In the least-altered (LA) sedimentary rocks, quartz and biotite are associated with pyrrhotite and ilmenite as the main sulfide and oxide mineral phases, respectively. SIP measurements conducted at district and outcrop scales and along a drill core indicated that proximally altered sedimentary rocks were characterized by low total chargeability values ([Formula: see text] to [Formula: see text] in the laboratory and [Formula: see text] in the field). In contrast, the LA sedimentary rocks were characterized by total chargeability values up to [Formula: see text] in the laboratory and [Formula: see text] in the field. We conclude that mineralized zones associated with this type of ore deposit are characterized by low chargeability anomalies.
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Bevins, R. E. "Pumpellyite-dominated metadomain alteration at Builth Wells, Wales–evidence for a fossil submarine hydrothermal system?" Mineralogical Magazine 49, no. 352 (June 1985): 451–56. http://dx.doi.org/10.1180/minmag.1985.049.352.15.
Повний текст джерелаАнотація:
AbstractTwo metamorphic alteration styles have been observed in basic lavas and volcaniclastic rocks of the Builth Volcanic Series of Ordovician age exposed at Llanelwedd Quarry, in the Builth lnlier, Wales. The first alteration style is characterized by the development of a mineral assemblage comprising albite+chlorite+ sphene+ pumpellyite ± prehnite ± calcite ± white mica, although original textures are largely preserved. This alteration pattern corresponds with that developed in volcanic and volcaniclastic rocks elsewhere in Wales, and which is attributed to the effects of burial. The second alteration style is characterized by the development of metadomains dominated by pumpellyite or, more rarely, prehnite. In the metadomains no original textures are seen in hand specimen. This alteration pattern has, so far, not been observed elsewhere in Wales, and it is here suggested that it might result from a submarine hydrothermal circulation system.
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Sarmili, Lili, and Johanes Hutabarat. "INDICATION OF HYDROTHERMAL ALTERATION ACTIVITIES BASED ON PETROGRAPHY OF VOLCANIC ROCKS IN ABANG KOMBA SUBMARINE VOLCANO, EAST FLORES SEA." BULLETIN OF THE MARINE GEOLOGY 29, no. 2 (February 15, 2016): 91. http://dx.doi.org/10.32693/bomg.29.2.2014.69.
Повний текст джерелаАнотація:
The presence of mineral alteration or secondary processes to rocks on submarine volcano of Abang Komba was caused by an introduction of hydrothermal solutions. Those are indicated by the presence of a resembly of minerals alteration seen in their petrographic analyses. They are characterized by replacement partially surrounding of plagioclase phenocrysts, partially replacing plagioclase by sericite, carbonate and clay minerals. The replacement of pyroxene partly by chlorite, and the presence of albitisation (secondary albite) contained in fine rectangular plagioclase sized. Other fitures occasionally observed by the presence of partial oxidation of ore minerals and the presence of quartz, and epidote as an alteration from plagioclase and pyroxene.
Keywords : alteration, resembly of minerals alteration, oxidation, submarine vulcano of Abang Komba.
Gejala alterasi atau proses-proses sekunder yang terjadi pada batuan di gunung bawah laut Abang Komba adalah disebabkan oleh introduksi larutan hidrotermal. Semua ini ditunjukkan dengan kehadiran kumpulan mineral ubahan yang terlihat dalam sayatan batuan. Kumpulan mineral ini dicirikan dengan adanya penggantian sebagian yang mengelilingi fenokris plagioklas, penggantian sebagian plagioklas oleh serisit, karbonat dan mineral lempung. Penggantian sebagian piroksen oleh klorit, dan adanya gejala albitisasi (albit sekunder) yang terdapat pada plagioklas berbentuk balokan yang berukuran halus. Gejala lainnya yang kadang-kadang teramati adanya oksidasi sebagian dari mineral bijih dan hadirnya kuarsa, serta epidot sebagai hasil ubahan plagioklas dan piroksen. Kata kunci : alterasi, kumpulan mineral ubahan, oksidasi, gunung bawahlaut Abang Komba.
Дисертації з теми "Albite alteration"
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Bouabsa, Lakhdar. "Intrusions granitiques à albite et topaze : Minéralisations stanno-wolframifères et altérations hydrothermales associées, l'exemple du hoggar central, Algérie." Nancy 1, 1987. http://www.theses.fr/1987NAN10329.
Повний текст джерелаАнотація:
Le présent travail met l'accent sur la dualité du magmatisme de cette région du Hoggar Central. Outre un granite banal à biotite (parfois amphibole) constituant l'ossature principale des granites post orogéniques (Taourirts), il est mis en évidence un type particulier de granite spécialisé à albite, topaze et protolithionite comme paragénèse I. Ce magmatisme évolué est sans liaison génétique avec le précèdent comme le soulignent les contacts intrusifs marqués par des stockscheiders et les discontinuités géochimiques au niveau des éléments majeurs et tracés. La liaison spatiale et génétique des altérations hydrothermales avec ce magmatisme spécialisé apparait évidente. Ces altérations affectent les différents termes magmatiques de la région ; Elles sont essentiellement lithinifères, fluorées (protolithionite, muscovité lithinifère, topaze et fluorine) et peuvent conduire à des phénomènes de convergence à partir des granites banaux à biotite. Les minéralisations SN-W, déjo exprimées de façon primaire dans les granites à albite - topaze, sont liées au développement de ces altérations greisénisantes fissurales
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Franklin, H. D. "Spatial analysis and systematics of discrete extensional structures in the vicinity of the Kanmantoo Cu-Au mineral deposit, South Australia." Thesis, 2009. http://hdl.handle.net/2440/128769.
Повний текст джерелаАнотація:
This item is only available electronically.The Kanmantoo Cu-Au deposit, situated 55 km south-east of Adelaide, is hosted in the Tapanappa Formation of the Kanmantoo Trough. Recent evidence supports an epigenetic mineralising model for the deposit with respect to the Delamerian Orogeny of ~514 to 490 ±3 Ma. The Delamerian deformation event is the oldest portion of the Tasmanides, a 20 000 km orogenic belt along the eastern palaeo-pacific margin of Gondwana. Mineralisation of the Kanmantoo deposit has been linked with post-Delamerian multi-phase extension in east dipping normal faults. The final stages of extension resulted in non-mineralised north dipping normal faults and proximal discrete fracturing. Structural analysis of geology centred on the Kanmantoo deposit has classified a systematic set of extensional fracturing, developed in- the Kanmantoo deposit and in the region surrounding the deposit for >5 km radius. The fracture set trends east-west and dips steeply to the north with a recorded mean orientation of 75/359°. Fractures are characteristically not offset by shearing, strike for tens of metres, have variable frequency, and alterations influenced by fluid migration. Petrographic and geochemical analysis (SEM)in this study has defined a regionally distributed fracture-hosted albitic alteration, which is relatively enriched in Na, Ca, Al and depleted in Fe, Mg and K. A late stage extensional setting is supported for the development of the discrete sub-vertical fracturing.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2009
Книги з теми "Albite alteration"
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Kalinin, A. A., Ye E. Savchenko, and V. Yu Prokofiev. Mineralogy and genesis of the Oleninskoe gold deposit (Kola Peninsula). FRC KSC RAS, 2021. http://dx.doi.org/10.37614/978.5.91137.446.4.
Повний текст джерелаАнотація:
Data on geology of the Oleninskoe deposit, and results of mineralogical and geochemical investigations of ores and altered rocks are presented. Mineralization is connected with granite porphyry sills, an end member of gabbrodiorite-diorite-granodiorite complex of minor intrusions. The main alteration processes are diopsidization and biotitization, formation of quartz-muscovite-albite, quartz-aresenopyrite-tourmaline, and quartz metasomatic rocks. More than 50 ore minerals (sulfides, sulfosalts, tellurides, and native metals) were identified in the ore, including 20 minerals of silver and gold. Mineral associations in the ore and sequence of mineral formation are defined. Five generations of gold-silver alloys are identified, its composition covers spectrum from native silver to high-grade gold. Mineralized fluids in the deposit are of high salinity (sodium and calcium chlorides), and rich in As, Sb, Pb, Cu, Zn, and Ag. The Oleninskoe deposit is classified as an epithermal metamorphosed gold deposit.The book is of interest for specialists in economic geology, mineralogy and geochemistry of ore deposits.
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Straub, Rainer H. Neuroendocrine system. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0022.
Повний текст джерелаАнотація:
Endocrine abnormalities are very common in patients with chronic autoimmune rheumatic diseases (CARDs) due to the systemic involvement of the central nervous system and endocrine glands. In recent years, the response of the endocrine (and also neuronal) system to peripheral inflammation has been linked to overall energy regulation of the diseased body and bioenergetics of immune cells. In CARDs, hormonal and neuronal pathways are outstandingly important in partitioning energy-rich fuels from muscle, brain, and fat tissue to the activated immune system. Neuroendocrine regulation of fuel allocation has been positively selected as an adaptive programme for transient serious, albeit non-life-threatening, inflammatory episodes. In CARDs, mistakenly, the adaptive programmes are used again but for a much longer time leading to systemic disease sequelae with endocrine (and also neuronal) abnormalities. The major endocrine alterations are depicted in the following list: mild activation of the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system, inadequate secretion of ACTH and cortisol relative to inflammation, loss of androgens, inhibition of the hypothalamic-pituitary-gonadal axis and fertility problems, high serum levels of oestrogens relative to androgens, fat deposits adjacent to inflamed tissue, increase of serum prolactin, and hyperinsulinaemia (and the metabolic syndrome). Neuroendocrine abnormalities are demonstrated using this framework that can explain many CARD-related endocrine disturbances. This chapter gives an overview on pathophysiology of neuroendocrine alterations in the context of energy regulation.
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Straub, Rainer H. Neuroendocrine system. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199642489.003.0022_update_002.
Повний текст джерелаАнотація:
Endocrine abnormalities are very common in patients with chronic autoimmune rheumatic diseases (CARDs) due to the systemic involvement of the central nervous system and endocrine glands. In recent years, the response of the endocrine (and also neuronal) system to peripheral inflammation has been linked to overall energy regulation of the diseased body and bioenergetics of immune cells. In CARDs, hormonal and neuronal pathways are outstandingly important in partitioning energy-rich fuels from muscle, brain, and fat tissue to the activated immune system. Neuroendocrine regulation of fuel allocation has been positively selected as an adaptive programme for transient serious, albeit non-life-threatening, inflammatory episodes. In CARDs, mistakenly, the adaptive programmes are used again but for a much longer time leading to systemic disease sequelae with endocrine (and also neuronal) abnormalities. The major endocrine alterations are depicted in the following list: mild activation of the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system, inadequate secretion of ACTH and cortisol relative to inflammation, loss of androgens, inhibition of the hypothalamic-pituitary-gonadal axis and fertility problems, high serum levels of oestrogens relative to androgens, fat deposits adjacent to inflamed tissue, increase of serum prolactin, and hyperinsulinaemia (and the metabolic syndrome). Neuroendocrine abnormalities are demonstrated using this framework that can explain many CARD-related endocrine disturbances. This chapter gives an overview on pathophysiology of neuroendocrine alterations in the context of energy regulation.
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Straub, Rainer H. Neuroendocrine system. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199642489.003.0022_update_003.
Повний текст джерелаАнотація:
Endocrine abnormalities are very common in patients with chronic autoimmune rheumatic diseases (CARDs) due to the systemic involvement of the central nervous system and endocrine glands. In recent years, the response of the endocrine (and also neuronal) system to peripheral inflammation has been linked to overall energy regulation of the diseased body and bioenergetics of immune cells. In CARDs, hormonal and neuronal pathways are outstandingly important in partitioning energy-rich fuels from muscle, brain, and fat tissue to the activated immune system. Neuroendocrine regulation of fuel allocation has been positively selected as an adaptive programme for transient serious, albeit non-life-threatening, inflammatory episodes. In CARDs, mistakenly, the adaptive programmes are used again but for a much longer time leading to systemic disease sequelae with endocrine (and also neuronal) abnormalities. The major endocrine alterations are depicted in the following list: mild activation of the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system, inadequate secretion of ACTH and cortisol relative to inflammation, loss of androgens, inhibition of the hypothalamic-pituitary-gonadal axis and fertility problems, high serum levels of oestrogens relative to androgens, fat deposits adjacent to inflamed tissue, increase of serum prolactin, and hyperinsulinaemia (and the metabolic syndrome). Neuroendocrine abnormalities are demonstrated using this framework that can explain many CARD-related endocrine disturbances. This chapter gives an overview on pathophysiology of neuroendocrine alterations in the context of energy regulation.
Частини книг з теми "Albite alteration"
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Ross, Colin, Jeremy P. Richards, and Ross Sherlock. "Geology, Alteration, and Geochronology of the Cerro Vetas Porphyry Gold-Copper Deposit, Middle Cauca Belt, Colombia." In Tectonomagmatic Influences on Metallogeny and Hydrothermal Ore Deposits: A Tribute to Jeremy P. Richards (Volume II), 311–32. Society of Economic Geologists, 2021. http://dx.doi.org/10.5382/sp.24.17.
Повний текст джерелаАнотація:
Abstract The Cerro Vetas porphyry deposit is part of the Titiribi district of the Middle Cauca porphyry-epithermal belt of western Colombia. The Cerro Vetas porphyry stock consists of a premineral diorite intruded by a late-mineral quartz monzonite, with intrusion and contact breccias. These units intrude pre-Cenozoic basement metabasalts and schists, Oligocene-Miocene Amagá Formation sedimentary rocks with intercalated andesite flows. Two phases of potassic alteration are recognized, a biotite-dominant phase in the diorite, and secondary K-feldspar in the quartz-monzonite intrusion. An overprinting and grade destructive, calcic-sodic alteration (actinolite + albite ± magnetite) affects both porphyries. Biotite alteration is overprinted by weak-moderate phyllic alteration in the upper 100 m in the deposit. Below 100 m, phyllic alteration assemblages are constrained to structural zones. Mineralization is dominated by a chalcopyrite-gold-pyrite assemblage associated with biotite that is hosted in a truncated stockwork in the apical portion of the deposit with metal ratios typical of a gold-rich copper-gold porphyry. The intrusions were dated, using U-Pb in zircon laser ablation inductively coupled plasma-mass spectroscopy, to between 7.65 to 7.24 Ma, consistent with other deposits in the Middle Cauca belt. Lithologic, alteration, and stratigraphic relationships at the deposit suggest that the Cerro Vetas porphyry was emplaced at shallow depths and that the upper portion of the deposit has been eroded.
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Thébaud, Nicolas, Andrew Allibone, Quentin Masurel, Aurélien Eglinger, James Davis, Anne-Sylvie André-Mayer, John Miller, Morou François Ouedrago, and Mark Jessell. "Chapter 34: The Paleoproterozoic (Rhyacian) Gold Deposits of West Africa." In Geology of the World’s Major Gold Deposits and Provinces, 735–52. Society of Economic Geologists, 2020. http://dx.doi.org/10.5382/sp.23.34.
Повний текст джерелаАнотація:
Abstract Paleoproterozoic terranes of the Man-Leo Shield in the southern part of the West African craton host one of the world’s largest gold provinces with an overall endowment >10,000 metric tons (t). Although gold deposition commenced by ca. 2170 Ma, most deposits formed later, either during the inversion and metamorphism of intraorogenic sedimentary basins between ca. 2110 and 2095 Ma, or during later transcurrent deformation and associated widespread high K plutonism following docking of Archean and Paleoproterozoic domains within the craton at ca. 2095 Ma. Deposits formed between ca. 2110 and 2095 Ma include those with free gold in quartz veins and refractory gold in arsenopyrite and/or pyrite, and are associated with halos of carbonate, sericite, chlorite, and albite alteration. Most are located in bends and intersections between shear zones, minor faults, folds, and entrained blocks of relatively reactive igneous rock. Conglomerate-hosted gold deposits of the Tarkwa district formed early in the 15-m.y.-long period. Gold deposits that formed subsequently between ca. 2095 and 2060 Ma have a wider variety of styles, geologic settings, and metal assemblages. District-scale albite, carbonate, and tourmaline alteration, hydrothermal breccias, and a close relationship to high K granitoids characterize some of these deposits, whereas others are more typical orogenic gold deposits that are similar to those formed earlier during the craton evolution.
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Meng, Xuyang, Daniel Kontak, Jeremy Richards, Jingwen Mao, and Jeffrey Marsh. "Uncovering the Missing Magmatic Link for The Tongkuangyu Porphyry Cu Deposit, Trans-North China Orogen: Implication for Porphyry Cu Deposit Model and Exploration." In Tectonomagmatic Influences on Metallogeny and Hydrothermal Ore Deposits: A Tribute to Jeremy P. Richards (Volume I), 121–35. Society of Economic Geologists, 2021. http://dx.doi.org/10.5382/sp.24.08.
Повний текст джерелаАнотація:
Abstract The Tongkuangyu porphyry Cu deposit in the northern Zhongtiaoshan region of the Trans-North China orogen formed at ~2.1 Ga and is much younger than its host ~2.18 Ga porphyritic rocks that cut basaltic-andesitic sill and rhyolitic tuff of the Jiangxian Group. However, the extent and absolute timing of the synmineralization magmatism in the northern Zhongtiaoshan region remains poorly constrained, which renders identifying the source of the cupriferous magmatic-hydrothermal fluids for Tongkuangyu difficult. To resolve this issue, we dated zircon from representative samples from the volcano-plutonic sequences reported to contain poorly constrained ~2.1 Ga igneous rocks using laser-ablation multicollector inductively coupled plasma-mass spectrometry (LA-ICP-MS). Rhyolitic tuff from the Jiangxian Group, granodiorite from the deepest limit of the mineralized host rocks at Tongkuangyu, and samples from an interpreted basaltic-andesitic tuff sequence in the overlying Zhongtiao Group were collected. The rhyolitic tuff yielded an upper concordia intercept age of 2188 ± 12 Ma (2σ, mean square of weighted deviates [MSWD] = 0.24). Three granodiorite samples yielded upper intercept ages of 2166 to 2177 Ma. These results do not support the presence of ~2.1 Ga magmatism in the Jiangxian Group and the Tongkuangyu deposit area. In contrast, two albite-chlorite-sericite schist samples, which are interpreted as basaltic-andesitic tuffs, yielded upper concordia intercept and concordia ages of 2088 ± 16 Ma (2σ, MSWD = 0.05) and 2085 ± 11 Ma (2σ, MSWD = 0.26), which agree within uncertainty to the known age for the porphyry Cu mineralization. Furthermore, a large proportion of ~2.18 Ga zircon xenocrysts from the analyzed basaltic to andesitic tuff samples yielded distinguishable εHf(t) values of 1.3 ± 0.8 (2σ) compared to the ~2.09 Ga zircons (5.6 ± 0.6; 2σ) but are consistent with the published εHf(t) values for the granodiorite host at Tongkuangyu. These results suggest the ~2.09 Ga magmas that fed the volcanic sequence were contaminated by the older regional ~2.18 Ga igneous wall-rock material. We interpret the results to indicate the presence of a presently unexposed ~2.1 Ga causative magma chamber, which exsolved hydrothermal fluids to form the Tongkuangyu deposit. Except for the age discordance between the host rocks and mineralization, Tongkuangyu is comparable in other respects (e.g., vein and stockwork mineralization, alteration) to most Phanerozoic porphyry Cu deposits globally. The results therefore suggest that consolidated but structurally receptive (i.e., permeable) porphyritic and equigranular rocks can trap magmatic-hydrothermal fluids to form porphyry-type alteration and Cu mineralization, which is significant in the context of exploration for such mineralization.
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Sun, Miao, Kai Ma, Jie Wen, Guangxian Wang, Changliang Zhang, Qi Li, Xiaofeng Bao, and Hui Wang. "A Review of the Brain-Gut-Microbiome Axis and the Potential Role of Microbiota in Alzheimer’s Disease." In Advances in Alzheimer’s Disease. IOS Press, 2022. http://dx.doi.org/10.3233/aiad220005.
Повний текст джерелаАнотація:
Alzheimer’s disease (AD) is a neurodegenerative process characterized by loss of neurons in the hippocampus and cerebral cortex, leading to progressive cognitive decline. Pathologically, the hallmark of AD is accumulation of “senile” plaques composed of amyloid-β (Aβ) protein surrounding neurons in affected regions. Despite extensive research into AD pathogenesis and therapeutic targets, there remains no breakthroughs in its management. In recent years, there has been a spark of interest in the connection between the brain and gastrointestinal tract, referred to as the brain-gut axis, and its potential implications for both metabolic and neurologic disease. Moreover, the gastrointestinal flora, referred to as the microbiome, appears to exert significant influence over the brain-gut axis. With the need for expanded horizons in understanding and treating AD, many have turned to the brain-gut-microbiome axis for answers. Here we provide a review of the brain-gut-microbiome axis and discuss the evidence supporting alterations of the axis in the pathogenesis of AD. Specifically, we highlight the role for the microbiome in disruption of Aβ metabolism/clearance, increased permeability of the blood-brain barrier and modulation of the neuroinflammatory response, and inhibition of hippocampal neurogenesis. The majority of the above described findings are the result of excellent, albeit basic and pre-clinical studies. Therefore, we conclude with a brief description of documented clinical support for brain-gut-microbiome axis alteration in AD, including potential microbiome-based therapeutics for AD. Collectively, these findings suggest that the brain-gut-microbiome axis may be a “lost link” in understanding and treating AD and call for future work.
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Straub, Rainer H. "Neuroendocrine system and chronic autoimmune rheumatic diseases." In Oxford Textbook of Rheumatology, 162–71. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0022_update_004.
Повний текст джерелаАнотація:
Endocrine abnormalities are very common in patients with chronic autoimmune rheumatic diseases (CARDs) due to the systemic involvement of the central nervous system and endocrine glands. In recent years, the response of the endocrine (and also neuronal) system to peripheral inflammation has been linked to overall energy regulation of the diseased body and bioenergetics of immune cells. In CARDs, hormonal and neuronal pathways are outstandingly important in partitioning energy-rich fuels from muscle, brain, and fat tissue to the activated immune system. Neuroendocrine regulation of fuel allocation has been positively selected as an adaptive programme for transient serious, albeit non-life-threatening, inflammatory episodes. In CARDs, mistakenly, the adaptive programmes are used again but for a much longer time leading to systemic disease sequelae with endocrine (and also neuronal) abnormalities. The major endocrine alterations are depicted in the following list: mild activation of the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system, inadequate secretion of ACTH and cortisol relative to inflammation, loss of androgens, inhibition of the hypothalamic-pituitary-gonadal axis and fertility problems, high serum levels of oestrogens relative to androgens, fat deposits adjacent to inflamed tissue, increase of serum prolactin, and hyperinsulinaemia (and the metabolic syndrome). Neuroendocrine abnormalities are demonstrated using this framework that can explain many CARD-related endocrine disturbances. This chapter gives an overview on pathophysiology of neuroendocrine alterations in the context of energy regulation.
6
Cardeña, Etzel, and Lena Lindström. "The light and the bulb: The psychology and neurophysiology of mystical experience." In Spirituality and Mental Health Across Cultures, edited by Alexander Moreira-Almeida, Bruno Paz Mosqueiro, and Dinesh Bhugra, 95–114. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198846833.003.0007.
Повний текст джерелаАнотація:
Throughout history, people have described alterations of consciousness in which they experienced a sense of transcendence, being part of a much larger unity, sometimes encompassing the whole universe, or of being pure awareness. These experiences have been foundational for many religious and spiritual practices, albeit they have sometimes been treated as suspect or outright psycho- and or neuro-pathological. This chapter defines various aspects of the self, self-transcendence, and mystical experiences (ME), discusses the relation of ME with other constructs, its prevalence, psychological and demographic correlates, and its relation to mental health, reviews brain-imaging research on it, and concludes with a discussion of its ontological implications. By doing so, it seeks to give an overview of both enlightenment experiences, ‘the light,’ and the underlying neurophysiological processes, ‘the bulb’.
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Paley, Elena L., Tatiana Merkulova-Rainon, Aleksandr Faynboym, Valery I. Shestopalov, and Igor Aksenoff. "Geographical Distribution and Diversity of Gut Microbial NADH: Ubiquinone Oxidoreductase Sequence Associated with Alzheimer’s Disease." In Advances in Alzheimer’s Disease. IOS Press, 2022. http://dx.doi.org/10.3233/aiad220019.
Повний текст джерелаАнотація:
Earlier we reported induction of neurotoxicity and neurodegeneration by tryptophan metabolites that link the metabolic alterations to Alzheimer’s disease (AD). Tryptophan is a product of the Shikimate pathway (SP). Human cells lack SP, which is found in human gut bacteria exclusively using SP to produce aromatic amino acids (AAA). This study is a first attempt toward gene-targeted analysis of human gut microbiota in AD fecal samples. The oligonucleotide primers newly-designed for this work target SP-AAA in environmental bacteria associated with human activity. Using polymerase chain reaction (PCR), we found unique gut bacterial sequence in most AD patients (18 of 20), albeit rarely in controls (1 of 13). Cloning and sequencing AD-associated PCR products (ADPP) enables identification of Na(+)-transporting NADH: Ubiquinone reductase (NQR) in Clostridium sp. The ADPP of unrelated AD patients possess near identical sequences. NQR substrate, ubiquinone is a SP product and human neuroprotectant. A defici in ubiquinone has been determined in a number of neuromuscular and neurodegenerative disorders. Antibacterial therapy prompted an ADPP reduction in an ADPP-positive control person who was later diagnosed with AD-dementia. We explored the gut microbiome databases and uncovered a sequence similarity (up to 97%) between ADPP and some healthy individuals from different geographical locations. Importantly, our main findin of the significan difference in the gut microbial genotypes between the AD and control human populations is a breakthrough.
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Ribeiro Coutinho de Mendonça Furtado, Flaviana, Beatriz Ribeiro Coutinho de Mendonça Furtado, Gabriela Trigueiro Lopes Ramalho, Maria Eduarda Serafim Crispim, and Matheus Lima Dore. "OVULATORY DYSFUNCTION IN HIGH PERFORMANCE ATHLETES: A LITERATURE REVIEW." In Estudos Interdisciplinares em Ciências da Saúde, 122–25. Editora Acadêmica Periodicojs, 2022. http://dx.doi.org/10.51249/easn05.2022.836.
Повний текст джерелаАнотація:
Introduction: The practice of regular physical exercises brings numerous benefits in addition to when combined with adequate nutrition, which has been increasingly stimulated as a way of preventing chronic diseases, improving bone mass, acquiring adequate body mass index, in addition to reducing the risk of cardiovascular disease. However, more rigorous training regimens adopted by athletes in the reproductive period can cause hormonal changes, even stopping menstruation. By combining ovulatory dysfunction, low bone mineral density and an energy deficit, we have the female athlete triad. Objective: objective of the present study is to verify the prevalence of these physiological alterations in elite athletes in response to exercise. Methodology: To obtain a current analysis, a bibliographic review of the published works was carried out and inserted in the PUBMED, LILACS and SCIELO databases, crossing the keywords “amenorrhea”, “athlete” and “menstrual disorders”. As a result, articles were obtained that provide an overview of the latest updates on the topic. Results and discussions: Hypothalamic amenorrhea is one of the most common causes of secondary amenorrhea, and its occurrence is due to a defect in the release of the GnRH hormone, which leads to a decrease in the release of gonadotropins (FSH and LH). The final consequences of this process are important hormonal changes, which are manifested through severe hypoestrogenism. Menstrual dysfunctions, when associated with low body mass, low fat percentage and premature osteoporosis, can be indicators of the Female Athlete Triad (TMA). It can have short- and long-term consequences. In the short term, oligomenorrheic athletes have been victims of high injury rates, particularly stress fractures, and in the long term, those that become osteoporotic are at increased risk of fractures with their resulting morbidity, albeit at a young age. Conclusion: With the increase in the discussion about the benefits of sport, new conditions related to it have been increasingly studied. It is important to emphasize that the athlete’s training load should not exceed the normal functioning condition of the organism. According to the studies analyzed, information on the occurrence of amenorrhea and other menstrual disorders, accompanied by adjuvant conditions should gain more attention among health professionals in the sport and its practitioners. health consequences, and developing educational actions for target groups, such as coaches, coaches, parents, athletes, sports administrators and institutional authorities
Тези доповідей конференцій з теми "Albite alteration"
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Maulana, F. ,. R. "Remote Sensing Aplication and Geochemical Studies for Hydrocarbon-Induced Alterations Discoveries in Western Kendeng Zone." In Digital Technical Conference. Indonesian Petroleum Association, 2020. http://dx.doi.org/10.29118/ipa20-sg-376.
Повний текст джерелаАнотація:
The development of satellite imaging technology that has spectral capability has the potential to be utilized in hydrocarbon exploration. The presence of hydrocarbons can be detected through spectral recording of hydrocarbon seepage. Over a long period, hydrocarbon seepage will change the chemical structure and mineralogy of the surrounding soil and rocks, so that it will cause spectral anomalies that are key to the existence of active hydrocarbons and petroleum systems. The West Kendeng zone was chosen as a research location because several hydrocarbon seepage sites were found to contain, either oil or gas in the area. Based on hydrocarbon seepage spectral theory, Landsat 8 imagery has a wavelength spectrum capability that is sensitive to the anomalous object of hydrocarbon seepage. Therefore, this research was conducted to determine the distribution of hydrocarbon seepage areas in the West Kendeng zone by using Landsat 8 imagery. In addition to using Landsat 8, to strengthen the research results a surface geological mapping process was also carried out at the seepage location. Then the samples obtained were analyzed by XRD and XRF. XRD analysis was carried out to determine the types of minerals that became an anomaly around the seepage location. In addition, the XRF analysis is carried out to determine the chemical composition of rocks that have undergone alteration. Based on the results of Landsat 8 data calibration, an altered rock which is an anomaly of hydrocarbon seepage is found in the south and southwest of the study site. These results are confirmed by the location of the discovery of several points of seepage of hydrocarbons in the research area. The XRD test results also showed anomalous clay mineral content in the form of halloysite, albite, and augite in the southwest and south of the study site. Besides this anomaly, magnetite and pyrite were also found at that location. While the XRF test results from the sample also showed the presence of Fe2O3 element at 9.21% and CaO at 7.42% in the south and southwest of the study location. This indicates a reaction between hydrocarbons and rocks that affect the acidity conditions around them, so they will form clay minerals, iron oxides, and iron sulfides. Therefore, based on Landsat 8 image analysis, XRD, and XRF, a hydrocarbon seepage distribution area accumulated in the Bancak, Boto, Wonokerto, and Nyemoh areas in the Semarang Regency.
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Mohamad, Naser, and Kambiz Farhang. "A Vibration Model of a Suspension-Tire System." In ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/detc2004-57571.
Повний текст джерелаАнотація:
A two-dimensional suspension-Tire system is modeled to investigate the dynamic interaction between the suspension and the tire of an automotive system. A double A-arm suspension system is used in the model. Lagrange equation for a constrained set of generalized coordinates is employed to derive a lumped-mass model of the system. The effects of friction and mechanical characteristics of the tire-road interface in both lateral and vertical directions is modeled and utilized in the system’s dynamics using the Magic Formula for tire. The utilization of Lagrange equation along with the Magic Formula provided a means of prediction of the system’s dynamic response to different initial sprung mass load conditions and the alteration and optimization of the suspension system geometry to achieve minimum sprung mass and tire vibration. The model is used to illustrate tire slip angle variation as a result of induced vibration due to a step load along the vertical and lateral direction. Albeit the response is a damped nonlinear vibration response, the system shows relatively large variation in slip angle in the transient regime of the system response.
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Grover, Anjana, K. C. Pandey, N. K. Satija, and R. M. Rai. "PESTICIDE INDUCED CHANGES IN COAGULATION AND FIBRINOLYSIS IN EXPERIMENTAL ANIMALS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643071.
Повний текст джерелаАнотація:
A relationship between the quality of environment and incidence of human health has been recognized in recent years. While the diseases such as carcinogenesis, respiratory diseases, skin disorders are often correlated with exposure to environmental toxins, the possibility of a link between blood coagulation and chemical contaminants in food, water and air has rarely been suspected. Wide usage of DDT in public health and plant protection programmes have led to a considerably higher levels of the pesticide in the blood and body fat of Indian population. Therefore, in order to explore the possibilities of an alteration in blood coagulation and fibrinolysis in response to pesticide insult, a study was undertaken in experimental animals.Adult male albino rats were administered technical grade DDT, 100 mg per kg body weight i.p. for 3 consecutive days for acute exposure study and fed food containing the pesticide at a concentration of 100 mg per kg diet for a duration of 90 days for chronic exposure. Coagulation and fibrinolytic status was assessed at the end of exposure period. Acute exposure to DDT significantly increased platelet count but decreased wall adherence of blood while chronic exposure to DDT elevated platelet counts by 21% and increased wall adherence of blood by 28%. Plasma clotting times were found to be shortened considerably both in acute and chronically exposed animals. DDT seemed to activate both extrinsic and intrinsic pathway of coagulation as evident by marked acceleration in prothrombin time and partial thromboplastin time. Plasma fibrinogen concentrations were found to be higher by 31.6% in rats given acute treatment but 40% lower in chronically exposed animals. A marked increase in fibrinolytic activity was observed in both acutely and chronically exposed animals. Thus, administration of chlorinated pesticides like DDT seemed to have a prothrombotic effect in experimental animals.
Звіти організацій з теми "Albite alteration"
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Shaw, D. R., C. J. Hodgson, C. H. B. Leitch, and R. J. W. Turner. Geochemistry of albite-chlorite-pyrite and chlorite-pyrrhotite alteration, Sullivan Zn-Pb Deposit, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/134197.
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Turner, R. J. W., and C. H. B. Leitch. Relationship of Albitic and Chloritic Alteration To Gabbro Dykes and Sills At the Sullivan Deposit and Nearby area, southeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/133562.
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Corriveau, L., E. G. Potter, J. F. Montreuil, O. Blein, K. Ehrig, and A. F. De Toni. Iron-oxide and alkali-calcic alteration ore systems and their polymetallic IOA, IOCG, skarn, albitite-hosted U±Au±Co, and affiliated deposits: a short course series. Part 2: overview of deposit types, distribution, ages, settings, alteration facies, and ore deposit models. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2018. http://dx.doi.org/10.4095/306560.
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Corriveau, L. Iron-oxide and alkali-calcic alteration ore systems and their polymetallic IOA, IOCG, skarn, albitite-hosted U±Au±Co, and affiliated deposits: a short course series. Part 1: introduction. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/300241.
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