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Pseudoclastic texture

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F ig . 4. <span class="search-highlight">Textures</span> of least altered felsic volcanics in the Thalanga area a...
Published: 01 August 2001
in coherent footwall rhyolite with pseudoclastic texture. Domainal and/or multistage alteration processes caused the formation of chlorite-rich apparent clasts and a sericite-rich apparent groundmass (sample TH32-133.5, scale bar = 1 cm). e. Mottled alteration facies in coherent footwall rhyolite with quartz
Image
Host rocks to the Boundary VMS deposit. (A) Hanging-wall flow-banded margin...
Published: 01 May 2014
Fig. 9 Host rocks to the Boundary VMS deposit. (A) Hanging-wall flow-banded margin to a lobe and breccia facies rhyolite. (B) Hanging-wall rhyolite flow margin with black zones (false fiamme in a pseudoclastic texture; McPhie et al., 1993 ) that contain spherulites (white spots). (C) Footwall
Image
F ig . 5. Field photographs of the main felsic volcanic types at Parys Moun...
Published: 01 August 2001
of massive rhyolite A overlain by flow rubble (left of geologist). c. Rhyolite B volcaniclastic bed, strongly sericitized with disseminated sulfides, overlying blackish chloritized shale (bottom slot); hole CZ3, 136 to 138 m, shallow Engine zone; card length = 7 cm. d. Pseudoclastic texture in rhyolite C
Journal Article
Journal: Economic Geology
Published: 01 January 2015
Economic Geology (2015) 110 (1): 147–171.
... a mesh fracture pattern and have been replaced by multiple generations of serpentine and magnetite. Late-stage serpentine has migrated into the interstitial medium. Bulk-rock alteration textures include (1) fine-grained crystal-rich domains, which are alteration pseudoclasts and/or relict juvenile...
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Image
Pedogenized freshwater limestones:  a ) pseudo-brecciated <span class="search-highlight">texture</span> of the ro...
Published: 01 February 2015
Fig. 9 Pedogenized freshwater limestones: a ) pseudo-brecciated texture of the rock formed by irregular and subrounded pseudoclasts of micritic limestones embedded in a Microcodium rich micritic matrix-Bruncu Geroni outcrop (Orroli area); b–d ) Coremolla (Orroli area) outcrop: b
Journal Article
Journal: Economic Geology
Published: 01 August 2001
Economic Geology (2001) 96 (5): 1133–1148.
... alteration stages and the stability of the initial alteration minerals (e.g., Allen, 1988 ). The exception is at the margins of the orebodies, where alteration domains characterized by contrasting mineralogy, color, and abundance generate mottled, patchy, vein, and pseudoclastic textures ( Table 1...
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Journal Article
Journal: Economic Geology
Published: 01 May 2011
Economic Geology (2011) 106 (3): 437–450.
... in dimension, occur as horizons, pods, lenses, and pseudoclasts within more widespread breccias, with abrupt to gradational contacts with the surrounding breccias ( Fig. 6a ), making it difficult to classify the rocks as coherent or breccia. Even through the breccia textures, vertical columnar jointing...
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Image
F ig . 9. A. The protolith for the S4 alteration <span class="search-highlight">texture</span>
      is a laminat...
Published: 01 November 2001
F ig . 9. A. The protolith for the S4 alteration texture is a laminated, fine-grained, dolomitic shale with randomly distributed dolomite rhombs. Progressive siliceous alteration replaces the dolomite and concentrates carbonaceous material into bedding-parallel bands. B
Image
Scanning electron microscope (SEM) and cathodoluminescence (CL) images of a...
Published: 01 May 2011
, oscillatory zoned crystals that occlude pore space, replace clasts, or occur as matrix to “vein” breccia. (G) SEM image showing breccia with clasts of sandstone (dark) within apatite cement matrix (gray). (H) SEM image showing part of an apatite breccia zone. Note replacement texture that gives appearance
Journal Article
Journal: Economic Geology
Published: 01 November 2023
Economic Geology (2023) 118 (7): 1629–1655.
..., the apparent textures superficially resemble welded ignimbrite or coarse lithic breccia ( McPhie et al., 1993 ). The pseudoclastic texture can thus appear to have “patches” on the microresistivity image. Such pseudoclastic textures are very common in altered coherent lavas and intrusions ( McPhie et al., 1993...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2014
GSA Bulletin (2014) 126 (9-10): 1245–1258.
... oxidation of iron-rich precursor minerals. The presence of syn-sedimentary chert breccias comprising rotated fragments of laminated chert indicates that the precursor sediment was silicified shortly after deposition. The abundance of “dusty” greenalite inclusions, which are texturally the earliest...
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Journal Article
Journal: Economic Geology
Published: 01 November 2001
Economic Geology (2001) 96 (7): 1535–1565.
...F ig . 9. A. The protolith for the S4 alteration texture is a laminated, fine-grained, dolomitic shale with randomly distributed dolomite rhombs. Progressive siliceous alteration replaces the dolomite and concentrates carbonaceous material into bedding-parallel bands. B...
FIGURES | View All (21)
Journal Article
Journal: Economic Geology
Published: 01 August 2001
Economic Geology (2001) 96 (5): 1175–1200.
... in coherent footwall rhyolite with pseudoclastic texture. Domainal and/or multistage alteration processes caused the formation of chlorite-rich apparent clasts and a sericite-rich apparent groundmass (sample TH32-133.5, scale bar = 1 cm). e. Mottled alteration facies in coherent footwall rhyolite with quartz...
FIGURES | View All (16)
Journal Article
Journal: Economic Geology
Published: 01 August 2001
Economic Geology (2001) 96 (5): 1149–1173.
... is an extensive semistratiform zone of quartz + sericite ± chlorite + pyrite representing pervasive feldspar and glass-destructive hydrothermal alteration. The pseudoclastic textural modifications produced by domainal alteration of formerly glassy volcanics (described by Paulick and McPhie, 1999 ) significantly...
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Journal Article
Journal: Economic Geology
Published: 01 September 2004
Economic Geology (2004) 99 (6): 1177–1196.
... approximately 120 km northeast of Sept-Îles, Quebec. The deposit, which comprises different textural facies of magnetite and hematite mineralization, occurs along the southeast margin of the Canatiche granitic complex. Porphyroidal leucogranite and volcanic equivalents of the Canatiche Complex are the main...
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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1963
AAPG Bulletin (1963) 47 (9): 1657–1680.
... to a pseudoclastic texture, similarity and merging of cryptocrystalline pellets and matrix, similarity of pellets and rounded algal fragments, and small size of the pellets. Irregular patches in the pelleted matrix are filled by clear sparry calcite. Where fairly well defined, the pellets range up to .20 mm...
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Journal Article
Published: 01 February 2015
Italian Journal of Geosciences (2015) 134 (1): 134–148.
...Fig. 9 Pedogenized freshwater limestones: a ) pseudo-brecciated texture of the rock formed by irregular and subrounded pseudoclasts of micritic limestones embedded in a Microcodium rich micritic matrix-Bruncu Geroni outcrop (Orroli area); b–d ) Coremolla (Orroli area) outcrop: b...
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Journal Article
Journal: Economic Geology
Published: 01 January 2006
Economic Geology (2006) 101 (1): 179–197.
.... Color variations and variable preservation of phenocrysts commonly have resulted in the formation of granular pseudoclastic textures. The upper contact of the coherent dacite coincides with the occurrence of monomictic dacite breccia with a sediment matrix, interpreted to be a peperite. However...
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Journal Article
Journal: Economic Geology
Published: 01 August 2001
Economic Geology (2001) 96 (5): 1227–1237.
... and reactive footwall rhyolites are fracture controlled and produce a pseudoclastic texture by domainal sericite-pyrite alteration. A number of studies of δ 18 O variations within VHMS systems have been undertaken on a regional scale, notably those of Green et al. (1983) , Taylor and South (1985...
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Journal Article
Journal: Economic Geology
Published: 01 May 2024
Economic Geology (2024) 119 (3): 617–641.
... or tectonic setting. The internal textures of these veins are typically nonunique, and where they are overprinted by subsequent deformation events, early vein types (e.g., porphyry, epithermal, VMS) may be similar to later orogenic veins ( Robert and Poulsen, 2001 ). Further complexity arises when multiple...
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