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Topic: Clinopyroxene

	Table T1. Petrographic summaries of samples from Hole 735B. (Site not responding. Last check: 2007-10-16)
		Clinopyroxene 15% altered to amphibole, plagioclase 5% altered to amphibole.
		Clinopyroxene is 5% altered to amphibole, plagioclase is<1% altered to amphibole.
		Clinopyroxene is 10% altered to amphibole, plagioclase 1% altered to amphibole.
	www.ga.gov.au /odp/publications/176_SR/chap_07/c7_t1.htm (1419 words)

	[No title]
		Aegirine, amphibole grp., analcime, biotite, clinopyroxene, diopside, hornblende, kalsilite, leucite, melilite, natrolite, nepheline, olivine, pectolite, phlogopite, quartz, thomsonite, wollastonite.
		Amphibole grp., apatite grp., calcite, clinopyroxene, diopside, dolomite, magnetite, olivine, phlogopite.
		Aegirine, arfvedsonite, biotite, clinopyroxene, feldspar grp., hastingsite, ilmenite, katophorite, magnetite, olivine, plagioclase, quartz.
	www.koeln.netsurf.de /~w.steffens/green.htm (504 words)

	TRACE ELEMENTS AND D/H IN PHLOGOPITE- AND AMPHIBOLE-BEARING ULTRAMAFIC XENOLITHS FROM KERGUELEN ARCHIPELAGO (TAAF) (Site not responding. Last check: 2007-10-16)
		Amphibole and phlogopite (and associated clinopyroxene) are key indicators of modal mantle metasomatism related to the percolation of high alkaline and carbonatitic melts throught the previously depleted upper mantle.
		The clinopyroxene is interstitial and associated with euhedral spinel and phlogopite.
		Clinopyroxenes in hydrous harzburgite are characterised by enrichment in REE (fig 1), particularly in LREE with a (La/Yb)n=10, a depletion in LILE and Nb, Ta, and negative anomalies in Pb, Ti, Sr, and Zr.
	www.es.mq.edu.au /GEMOC/Abstrfull98/Moine982.htm (1005 words)

	LITHOLOGY
		Pigeonite is a clinopyroxene characteristic of subalkaline volcanic rocks, and its presence confirms the petrographic classification of tholeiitic basalts.
		The segregation vesicles have acicular to skeletal plagioclase, subhedral to anhedral, equant to prismatic clinopyroxene, and needlelike or trellised iron titanium oxides in a devitrified glassy matrix.
		Absence of the magmatic oxides, ilmenite and magnetite, is a characteristic of gabbroic cumulates from the ocean crust (e.g., Natland and Dick, 1996).
	www-odp.tamu.edu /publications/200_IR/chap_04/c4_4.htm (6283 words)

	MYRMEKITE 18 OF 50
		11), the clinopyroxene granite gneiss is relatively undeformed.
		As clinopyroxene disappears and quartz increases, the proportions of residual feldspars increase so that the gneiss is converted into a felsic alaskite, consisting almost entirely of quartz and feldspars but containing trace amounts to 5 vol.
		In that process the garnet requires less silica in its structure than the clinopyroxene, and, therefore, some silica was left over to form quartz, either as tiny inclusions in the garnet or as separate crystals, increasing the modal percentage of quartz in the rock.
	www.csun.edu /~vcgeo005/sphene.htm (3572 words)

	Medinah Minerals, Inc. - Vancouver Petrographic 10.6.00 Report
		These rocks are composed of seriate-textured to porphyritic oligoclase-andesine, clinopyroxene, and relict ?hornblende or ?orthopyroxene, now pseudomorphed by amphibole and chlorite, in a matrix of K-feldspar and minor quartz.
		Clinopyroxene phenocrysts have euhedral but ragged (corroded) outlines up to 2 mm in diameter and are mantled by pale olive green amphibole (?hornblende) in parallel position.
		The creamy-coloured areas surrounding the mottles appear to be composed mainly of secondary alkali feldspar, possibly of oligoclase composition to judge by the relief against quartz, and lesser pyroxene and quartz, all forming subhedra mainly <0.2 mm in size.
	www.medinah-minerals.com /reports/petrographic_11-6-00.html (7362 words)

	[No title]
		Plagioclase Clinopyroxene Opaques Quartz 40 20 10 Tr(?) 40 20 10 Tr(?) 0.5-1.5 0.5-0.8 0.5-0.7 ~1 Laths Sub-anhedral Sub-anhedral N/A Intergranular.
		Plagioclase Clinopyroxene Opaques 65 15 2 65 8 2 0.8-1.2 0.1-0.9 0.2-0.5 Euhedral Anhedral N/A Laths, unzoned.
		Plagioclase Clinopyroxene Opaque 30 20 4 30 20 4 0.1-0.3 0.1-0.2 0.1 Laths Sub-anhedral Elongate Intergranular.
	www.ngdc.noaa.gov /mgg/geology/odp/data/120/749C/hrthin.dat (813 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The mineral-in curves for olivine, orthopyroxene, clinopyroxene, plagioclase, and spinel all converge on the liquidus at about 12 kbar demonstrating that ID-16 melt is saturated in the plagioclase/spinel peridotite assemblage at this pressure.
		At 15 kbar, clinopyroxene (+spinel) replaces olivine as the liquidus phase and is followed by orthopyroxene, plagioclase, olivine, and finally, garnet.
		Although clinopyroxene persists on the liquidus to at least 20 kbar, garnet is the second phase to crystallize at this pressure.
	www.unm.edu /~draper/geo/multsat.html (365 words)

	Thin Section Lab
		Clinopyroxene (Cpx) is similar to Opx, except Cpx has higher interference colors (is more colorful).
		Orthopyroxene has lower interference colors compared to clinopyroxene (like augite); thus, the orthopyroxene tends to be gray in color, while clinopyroxene tends to be pink, blue, and yellow.
		Orthopyroxene and clinopyroxene also have high relief when the polars are uncrossed and are much less clear than olivine.
	www.geoclassroom.com /mineralogy/thinsectionlab.shtml (785 words)

	Partitioning behaviour of Hf and Zr between amphibole, clinopyroxene, garnet, and silicate melts at high pressure. (Site not responding. Last check: 2007-10-16)
		Partition coefficients (D) have been determined for Hf (mainly) and Zr for amphibole, clinopyroxene and garnet crystallizing from Zr and Hf enriched basanite and andesite compositions at 0.5-3.0 GPa and 1000 - 11000C (basanite) or 900 - 9500C (andesite).
		Also, for amphibole and clinopyroxene DZr and DHf correlate strongly with DTi,and the pressure effect on Dís is most noteworthy between 0.5 and 1.5 GPa (about a 3-fold decrease in DHf for amphibole).
		Thus constancy of Sm/Zr in mantle melts cannot be attributed to a balance of clinopyroxene and garnet involvement.
	www.es.mq.edu.au /gemoc/annrep97/abs96/Green296.htm (180 words)

	CHEMICAL COMPOSITIONS OF CLINOPYROXENE, ORTHOPYROXENE, AND AMPHIBOLE FROM THE HIGH-TEMPERATURE MICROSCOPIC VEINS AND ...
		The secondary clinopyroxenes with interfingering textures plot between the magmatic clinopyroxenes and the clinopyroxenes near the high-temperature microscopic veins.
		Orthopyroxene is a subordinate mineral in the olivine gabbros, occurring as magmatic rims on cumulus grains of olivine and as blebs in intergrowths with brown amphibole in clinopyroxene grains both near the high-temperature microscopic veins and within the interfingering textures.
		Amphibole blebs in clinopyroxene from the interfingering areas are plotted in the field of pargasite, and those near the high-temperature microscopic veins are in the fields of pargasite, edenite, and magnesiohornblende.
	www-odp.tamu.edu /publications/176_SR/chap_04/c4_7.htm (795 words)

	[No title]
		Vesicles 30 3 Calcite, zeolites Elongated Clays 100 Clinopyroxene-plagioclase andesitic clast in a pebbly granule conglomerate.
		N G126 0792E071R01099101008 LTP Orthopyroxene-clinopyroxene andesite Porphyritic Plagioclase Clinopyroxene Orthopyroxene Magnetite 25 10 0 <1 25 10 5 <1
		Orthopyroxene altered with smectite and mantled by clinopyroxene.
	www.ngdc.noaa.gov /mgg/geology/odp/data/126/792E/hrthin.dat (1073 words)

	Laboratory basalts
		Thus, augite clinopyroxene is rare as a phenocrystal phase, but comprises up to 50% of the groundmass in basalts.
		The groundmass has domains of intersertal texture (glass occupies the wedge-shaped interstices between Plag laths), intergranular texture (the spaces between Plag laths are occupied by one or more grains of Px) and ophitic texture.
		The Feldspar phenocrystas are corroded and embayed, have a speckled center with a thin rim of clear feldspar.
	www.eos.ubc.ca /courses/eosc321/lab_basalts.htm (1144 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The distribution of latent heat across the liquidus-solidus intervals of the two samples is distinctly different, reflecting significant variation in the sequence and abundance of mineral phases during melting (clinopyroxene and leucite in the ugandite; olivine, clinopyroxene, and plagioclase in the basalt).
		This is due to cotectic precipitation of leucite and clinopyroxene, leading to a large, disproportionate release of latent heat early in the crystallization sequence.
		The results indicate that clinopyroxene is the most important mineral phase in controlling the shapes of the enthalpy profiles during cooling; this is due to its large enthalpy of fusion and its tendency for sluggish nucleation, followed by rapid crystallization at temperatures that vary with cooling rate.
	navrotsky.engr.ucdavis.edu /abstracts/CMP-118-94-169.html (386 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The photos above show a clinopyroxene grain in crossed (left) and uncrossed polarizers; exsolution lamellae of orthopyroxene are clearly visible in the left photo.
		Clinopyroxenes are abundant in many intrusive and extrusive igneous rocks, including diorite, gabbro, the peridotite family, basalt, and andesite.
		Above: clinopyroxene crystal in basalt: crossed polarizers on left, plane light on right.
	www.humboldt.edu /~jdl1/web.page.images/clinopyroxene1.html (139 words)

	8th INTERNATIONAL KIMBERLITE CONFERENCE (8IKC)
		Clinopyroxenes in eclogites from Kelsey Lake are similar to South African eclogites in that some are interpreted to indicate a mantle cumulate origin and some recycled oceanic crust.
		The garnet lherzolites are commonly enriched in modal clinopyroxene and garnet.
		Clinopyroxenes of type 1 that have trace element similarities to PIC rocks appear to have crystallized from, or been completely equilibrated with, a metasomatic agent related to Group 1 kimberlite magma.
	www.venuewest.com /8IKC/s4post.htm (7132 words)

	[No title]
		Clinopyroxene Tr Tr 0.2-0.3 Subhedral-euhedral Present singly and in a bimineralic glomeroporphyritic clots with plag.
		Some have an irregular outline, and are partially devitrified with glass inclusions in the core; the crystals are strongly zoned." Clinopyroxene Opaques GROUNDMASS Plagioclase 1.6 1.6 <=0.1 Euhedral "Laths and needles; microlites exhibit a subparallel orientation, parallel to the chilled margin.
		Clinopyroxene 10.3 10.3 0.02-0.05 Granular Grains are interstitial to plagioclase.
	owen.nhm.ac.uk /odp/publications/168_IR/TS1024.TXT (721 words)

	7ikc-symp
		Clinopyroxene from alkaline basalts corresponds to ferriferous end of the megacryst trend.
		Clinopyroxene from symplectites plots near inflection, and it is more magnesian than common ilmenite-clinopyroxene intergrowths.
		From estimated residual melt fraction after the symplectite precipitation in the Vitim area, we suppose, that eutectic clinopyroxenes must be more evolved than observed ones.
	geology.uiggm.nsc.ru /uiggm/geodynam/lab817/litasovk/abstracts/7ikc-symp.htm (784 words)

	Preliminary Investigations of the Most Recent Lava Flows from
		The tholeiitic to alkaline magmas of the volcano crystallize as basalts of hawaiite-andesite composition with phenocrysts of olivine, plagioclase, clinopyroxene and minor titano-magnetite.
		Carlsbad twinning and zoning is common in plagioclase, and clinopyroxene grains.
		Initial geochemical analyses indicate that samples from the recent eruptions of Mount Etna are alkaline, potassium-rich, and are of trachy-basalt composition.
	www.uregina.ca /geology/Seminars/2004NatalieMacLean.htm (291 words)

	Abstract EPSL 1998 (Site not responding. Last check: 2007-10-16)
		On Lanzarote and La Palma, MORB gabbros occur as xenoliths in Pleistocene and historic basanite scoria cones and lava flows.
		The MORB xenoliths are interpreted as fragments of Layers 2 and 3 of the underlying Mesozoic oceanic crust, based on mineral compositions (An-rich plagioclase, Ti- and Al-poor clinopyroxene, ± orthopyroxene ± olivine), depleted major and trace element signatures, and Jurassic ages (ca.
		The Lanzarote gabbros are very mafic (mg# 87 to 89 in clinopyroxene), moderately deformed, and highly depleted.
	www.palmod.uni-bremen.de /~akluegel/abs_epsl1998.htm (331 words)

	Earth Materials, Experimental Petrology (Site not responding. Last check: 2007-10-16)
		The xenoliths span a range of equilibration temperatures from 1150 to 1500 K (calculated at an assumed pressure of 1.5 GPa from two-pyroxene geothermometry), allowing the trace-element partitioning relationships among the phases (olivine, orthopyroxene, clinopyroxene, spinel, and in some lower temperature xenoliths, amphibole) to be quantified as a function of temperature.
		Although most incompatible trace elements are concentrated into clinopyroxene, the effect of increasing temperature is to redistribute these elements into orthopyroxene and even olivine, such that these latter phases hold non-negligible proportions of many trace elements at the temperature at which peridotite would be in equilibrium with basaltic melts.
		The inter-crystalline trace-element partition coefficients reported in this study can be used to reconstruct the trace-element abundances in clinopyroxene at melting temperatures, and should also prove useful in elucidating the histories of more complex mantle peridotites with unequilibrated mineral compositions and textures.
	rses.anu.edu.au /pep/annualreports/annualreport2003/oneill1.html (316 words)

	Abstracts (Site not responding. Last check: 2007-10-16)
		Granulitic assemblages consist of plagioclase (labradorite), clinopyroxene and variable amounts of orthopyroxene, red-brown amphibole (Ti-rich pargasite), garnet, green spinel, magnetite, ilmenite, biotite, apatite, zircon, sphene.
		Clinopyroxene may be also replaced by epidote + chlorite+ sphene (together with green hornblende).
		The extent of this retrogression is extremely variable: some samples show only negligible amounts of acicular green amphibole locally rimming clinopyroxene, whereas other rocks are almost completely converted into a low-temperature assemblage consisting of sericite + actinolite + chlorite ± epidote + Fe-Ti oxides.
	www.geo.unipr.it /~meli/pubblicazioni/ima.htm (396 words)

	IngentaConnect Petrogenesis of Ilmenite-Bearing Symplectite Xenoliths from Vitim... (Site not responding. Last check: 2007-10-16)
		Symplectite clinopyroxene from Vitim alkaline basalts corresponds to the low-Mg end of the clinopyroxene megacryst trend.
		Modeling of fractional crystallization of clinopyroxene from alkaline basaltic melt indicates that clinopyroxenes from symplectites correspond to the residual melt fraction of 20-40%, which is high for eutectic crystallization.
		We suggest that ilmenite-clinopyroxene symplectites characterize the initial stage of simultaneous precipitation of ilmenite and clinopyroxene.
	www.ingentaconnect.com /content/bell/igr/2003/00000045/00000011/art00003 (501 words)

	Grove Mountains 99027 (Site not responding. Last check: 2007-10-16)
		Wang & C. Lin, NU): It is composed mainly of coarse-grained orthopyroxene, olivine, clinopyroxene and plagioclase, with minor opaque minerals.
		In the larger part of the sections, olivine occurs as rounded euhedral grains, poikilitically enclosed in a megacryst of orthopyroxene; in the other side of the sections, it shows a cumulate texture, consisting of euhedral orthopyroxene, clinopyroxene, olivine and interstitial plagioclase.
		Compositions of orthopyroxene (En66-78Fs20- 26Wo2-8), clinopyroxene (En48-52Fs13-15Wo34-39), olivine (Fa22-30) and plagioclase (An49-55Ab44-50Or
	www2.jpl.nasa.gov /snc/grv99027.html (178 words)

	[No title]
		Amphibole grp., apatite grp., baddeleyite, biotite, clinopyroxene, feldspar grp., innelite, labuntsovite, lomonosovite, loparite-(Ce), magnetite, plagioclase, quartz, rinkolite, rutile, titanite, zircon, „sulfides“.
		Aegirine, albite, andesine, apatite grp., arfvedsonite, biotite, chlorite grp., chromite, clinopyroxene, diopside, eudialyte, forsterite, hedenbergite, hornblende, ilmenite, lamprophyllite, magnetite, microcline, murmanite, nepheline, orthoclase, perovskite, ramsayite, quartz, salite, serpentine grp., spinel, titanite, zeolite grp..
		Augite, clinopyroxene, kaersutite, olivine, orthopyroxene, phlogopite, sanidine, spinel.
	www.koeln.netsurf.de /~W.Steffens/aldan.htm (456 words)

	Title page for ETD etd-61098-171720
		Samples studied are vesicular porphyritic andesitic dacites containing phenocrysts of plagioclase, orthopyroxene, and clinopyroxene.
		Inclusions of plagioclase occur in pyroxenes and inclusions of orthopyroxene and clinopyroxene occur in plagioclase.
		Compositions of minerals are independent of mode of occurrence - that is, plagioclase (and orthopyroxene and clinopyroxene) compositions are the same regardless of whether they occur as phenocrysts or as inclusions in another mineral.
	scholar.lib.vt.edu /theses/available/etd-61098-171720 (548 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		Trace element compositions of clinopyroxene and amphibole from three rift-related alkaline to peralkaline igneous complexes (syenites and granites) in South Greenland reflect evolving magma composition as well as crystal chemical control on partitioning.
		A crystal chemical control is also indicated for the REE, since clinopyroxenes and amphiboles show continuous change from LREE-enriched patterns in the calcic minerals via wave-shaped pattern in the Ca-Na minerals towards a more pronounced HREE enrichment in the most Na-rich minerals.
		The partitioning of most trace elements between clinopyroxene and co-genetic amphibole is independent of melt composition or major element composition of the crystals.
	www.uni-tuebingen.de /uni/emi/ag-markl/pages/wenzel/pages/abstracts/tw2004b.html (504 words)

	David Kohlstedt's Rock and Mineral Physics Lab - Research Themes
		We are investigating the high-temperature, high-pressure rheological properties of clinopyroxene and olivine, important minerals in the lower crust and/or the upper mantle.
		Little is known about the strength of clinopyroxene relative to that of olivine, even when the two phases are present in the same rock as in the mantle.
		A careful investigation of the dependence of viscosity on water concentration for aggregates of clinopyroxene and clinopyroxene + olivine is critical in order to address these issues and to model the dynamical behavior of the lower crust and upper mantle.
	olivine.geology.umn.edu /new_themes_page.htm (1446 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		OH is consistently correlated with megacryst composition, exhibiting trends with Mg# that are similar to those of other minor and trace elements and indicating a record of high-pressure magmatic evolution.
		H substitution is not coupled to minor elements in olivine, but may be in ortho- and clinopyroxene.
		During differentiation, relative OH enrichment in clinopyroxene and olivine is consistent with proportional dependence on water activity, while that in garnet suggests a higher power law dependence and/or influence of temperature.
	minerals.gps.caltech.edu /Manuscripts/2004/monastery_megacrysts/Index.htm (302 words)

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