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Exe Breccia Formation

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Journal Article
Published: 01 October 2017
American Mineralogist (2017) 102 (10): 2119-2135.
... Korosten pluton. Their late-stage evolution is characterized by the formation of opal-cemented breccia. A polymineralic pseudomorph after beryl within the breccia includes bertrandite (±euclase) + F-muscovite (with tobelite component) + buddingtonite + organic matter (OM) + opal (+ traces of K-feldspar...
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Journal Article
Journal: Geology
Published: 01 November 2015
Geology (2015) 43 (11): 999-1002.
.... However, the cause of age resetting in lunar zircons is equivocal; as ex situ grains in breccias, they lack lithologic context and most do not contain microstructures diagnostic of shock that are found in terrestrial zircons. Detrital shocked zircons provide a terrestrial analog to ex situ lunar grains...
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Journal Article
Published: 01 July 2018
Italian Journal of Geosciences (2018) 137 (3): 433-451.
... to L-3 ) and continental (lithofacies L-4 to L-8 ) deposits, respectively. The analysis of mineralogical assemblages and some XRD parameters of the sedimentary sequences and older formations allowed recognizing a sedimentary evolution controlled by the activation of different source areasover time...
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Journal Article
Journal: Economic Geology
Published: 01 December 2016
Economic Geology (2016) 111 (8): 1883-1914.
... glassy monazite precipitated from hydrothermal fluids during breccia pipes formation at about 1465 Ma. The second episode of mineral growth at ca. 1443 Ma may be related to faulting and fluid flow that rebrecciated the pipes. The ca. 10-m.y. gap between the ages of host volcanic rocks and breccia pipe...
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Journal Article
Journal: Economic Geology
Published: 01 June 2006
Economic Geology (2006) 101 (4): 865-881.
... consisting of magmatic crystallization and subsolidus reequilibration of a sulfide liquid, accompanied by the formation of a magmatic PGM assemblage ex-solved from the sulfides. Although the evolution of the sulfide ore has been well defined, the origin and nature of the breccias, their genetic relationship...
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Series: Geological Society, London, Special Publications
Published: 01 January 2008
DOI: 10.1144/SP294.18
EISBN: 9781862395428
... of the Río de la Plata Craton. Volcanism is documented in the tectonically active areas of the craton ( Eerola 2001 ; Pazos et al. 2003 ; Saalmann et al. 2005 ) and is also coetaneous (Fig.  9a , b) with the Playa Hermosa Formation ( Loureiro et al. 2006 ), suggesting that seismic shock during high...
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Journal Article
Journal: Economic Geology
Published: 01 May 2011
Economic Geology (2011) 106 (3): 413-436.
... magmas ascended into the two-phase fluid field, they simultaneously ex-solved brine and vapor, from which laminated quartz-molybdenite veins were formed. Large volumes of magmatic fluid generated at this stage are also implicated in the formation of the Mount Leyshon Breccia. Magmatic vapors trapped...
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Journal Article
Journal: Geology
Published: 02 October 2017
Geology (2017) 45 (11): 1003-1006.
... of possibly linking ex situ granular zircon in lunar breccias with specific impact structures—and thus better calibrating the lunar cratering record with radiometric ages. * E-mail: gavin.kenny@nrm.se 13 01 2017 16 05 2017 03 08 2017 © The Authors 2017 Gold Open Access...
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Image
—Flat-pebble <b>breccia</b> with interparticle porosity similar to  Figure 31B  <b>ex</b>...
Published: 01 October 1967
Fig. 31A. —Flat-pebble breccia with interparticle porosity similar to Figure 31B except for greater prevalence of dense larger chips. Note high angle of repose of longest chips. See also Figure 47 . Sample loc.: Interlake Formation, Cabin Creek field, well 21–34, depth 8,689 ft.
Journal Article
Journal: Economic Geology
Published: 01 December 2016
Economic Geology (2016) 111 (8): 1935-1962.
... and associated REE mineralization. The magnetite-rich rocks and REE-rich breccias show similar REE and mantle-normalized trace element patterns. Nd isotope compositions (age corrected) show that: (1) host rhyolites have ɛ Nd from 3.44 to 4.25 and T DM from 1.51 to 1.59 Ga; (2) magnetite ore and specular hematite...
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Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1991
DOI: 10.5382/GB.10.07
EISBN: 9781934969632
... that facilitates the circulation of hydrothermal fluids necessary for the formation of volcanogenic deposits. The eas i 1 y access i b 1 e Don Camp 1 ex crops, put over 90 % of the area and provides a unique opportunity to observe and study volcanic processes that could not otherwise be fully appreciated under...
Journal Article
Published: 01 June 1962
The Canadian Mineralogist (1962) 7 (1): 146-207.
... unconformably above them. Extensive brecciation during extreme diatreme activity is considered as a prelude to the unique volcanic activity giving rise to the lower part of the Whitewater Series, within the Sudbury basin, the Onaping tuffs and breccias (glowing avalanche deposits) and associated sediments which...
Journal Article
Published: 01 June 2010
Italian Journal of Geosciences (2010) 129 (2): 223-236.
... interpretations of SQB are related both to the particular stratigraphical and structural relationships of these breccia bodies with the other geological formations and to the complex tectonic setting of this part of the Orobic orogen. As a matter of fact, the study area shows a complicated geological setting due...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1991
AAPG Bulletin (1991) 75 (8): 1324-1352.
... interpreted as abandoned shoreline deposits. The lower part of the Chinkeh Formation consists locally of an angular-chert breccia overlain by medium- to coarse-grained sandstone and conglomerate with coal and rooted beds. The uppermost Chinkeh Formation consists of a basal conglomeratic layer overlain...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2012
GSA Bulletin (2012) 124 (1-2): 104-132.
... of this core provides important new information regarding the nature and origin of within-crater suevite, which is not only relevant for the understanding of the formation of the Ries impact structure but has strong implications for impact breccia deposition in general. In the Enkingen core, below 21 m...
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Journal Article
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1308-1311.
... into high-pressure polymorphs. Brecciated rocks (breccias) are products of meteoroid impacts in which rocks of the Moon are shattered by impact. Local pressure and/or temperature spikes occur during impact, thus allowing for the formation of high-pressure polymorphs in breccias. The shattered rock fragments...
FIGURES
Journal Article
Published: 01 August 1988
Canadian Journal of Earth Sciences (1988) 25 (8): 1277-1291.
.... In these caves, the speleothems and sediments are still formed of CaCO 3 and thus contrast sharply with the dolostone of the Bluff Formation in which they occur. Some of the joints, sinkholes, and caves are filled with breccia, caymanite, terra rossa, terra rossa breccia, pisolitic limestone, and speleothems...
Journal Article
Published: 01 March 2003
South African Journal of Geology (2003) 106 (1): 17-34.
... of the arc. The belt contains prominent bodies of fragmental rocks including thrust sheets and megablocks of older Katangan strata, some of which contain Cu-Co mineralisation. These fragmental rocks were traditionally considered as tectonic friction breccias formed underneath the advancing Katangan nappes...
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Journal Article
Published: 01 November 2011
Bulletin de la Société Géologique de France (2011) 182 (6): 479-491.
..., and so post-rift, bringing the generalized extension of this period to an end. The Buadio breccia formation, defined by Routhier [1953 ] and then by Arnould [1958 ], is regarded as an unconform unit in the upper part of the succession and as belonging to the Eocene Neo-Caledonian flysch unit. Fig...
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Journal Article
Journal: Geology
Published: 01 October 2004
Geology (2004) 32 (10): 881-884.
... the Neoproterozoic Scout Mountain Member of the Pocatello Formation, southeast Idaho: Implications for Neoproterozoic Earth system behavior: Precambrian Research , v. 130 p. 57 - 70 . Ludwig , K.R. , 1999 , User's manual for Isoplot/Ex, Version 2.10, : A geochronological toolkit for Microsoft Excel...
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