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Browsing 286 results for facet Publication Year with value of 2009.
  • Thumbnail for Colorado College alpine journal [2009 v. 3]
    Colorado College alpine journal [2009 v. 3]

    The Colorado College Alpine Journal is a collection of climbing related stories and articles based on the experiences and adventures of Colorado College alumni and students. Contents for this issue include descriptions of climbs in North America, South America, Africa and Asia.

  • Thumbnail for The Catalyst [2008-2009 v. 39 no.14 January 30]
    The Catalyst [2008-2009 v. 39 no.14 January 30]

    The Catalyst is the weekly student newspaper of Colorado College. This issue was published January 30, 2009. Page 6 of issue missing. Page 10 of issue incorrectly dated December 30. Pages 2, 3, 4 of issue incorrectly dated 2008.

  • Thumbnail for The monthly rag [2009-2010 Block 3]
    The monthly rag [2009-2010 Block 3] by Colorado College. Dept. of Feminist and Gender Studies

    The Monthly Rag, a publication of the Feminist and Gender Studies interns, is found affixed to toilet stall walls around the Colorado College campus.

  • Thumbnail for La tertulia [2008-2009 v. 25 no. 1 Winter]
    La tertulia [2008-2009 v. 25 no. 1 Winter] by Colorado College. Dept. of Southwest Studies

    La Tertulia is the newsletter of the Hulbert Center for Southwest Studies of the Colorado College.

  • Thumbnail for SC-15
    SC-15

    This fine-grained, hypidiomorphic, inequigranular plutonic rock is intermediate in composition, with plagioclase as the dominant feldspar. K-feldspar is present in much lower abundance, and quartz is scarce. Mafic phases include anhedral biotite and hornblende, the latter of which is strongly chloritized.

  • Thumbnail for JPN-8
    JPN-8

    The groundmass of this porphyritic basalt is comprised chiefly of glass, plagioclase, and clinopyroxene, in decreasing proportions respectively. Some plagioclase phenocrysts have sieve textures, some inclusions of glass blebs, others are concentrically zoned, and still more are relatively fresh. Clinopyroxene phenocrysts frequently form glomeroporphyroclasts, sometimes with olivine; several grains have coronas of differing composition growing around them. Both olivine and clinopyroxene are heavily fractured and irregularly shaped.

  • Thumbnail for KBR2
    KBR2

    The dominant texture in this gabbro is an ophitic intergrowth of equant plagioclase laths within larger, subhedral, clinopyroxene grains. Alteration of some phases to chlorite, talc and iddingsite is localized and occurs more in non-ophitic sections of the rock.

  • Thumbnail for JPN-11
    JPN-11

    This aphanitic basalt is comprised entirely of aligned, microcrystalline plagioclase laths with interstitial olivine. The olivine is being replaced by iddingsite and while larger olivine phenocrysts are merely rimmed with iddingsite, the smaller, interstitial grains have been entirely altered to iddingsite.

  • Thumbnail for 59-K-91
    59-K-91

    This vesicular basalt contains microphenocrysts of olivine and orthopyroxene, both of which are also lesser components of the groundmass which consists mainly of uniformly-sized plagioclase laths. The olivine phenocryst have weak reaction rims. Some plagioclase is zoned and sieved.

  • Thumbnail for KBR2A
    KBR2A

    This gabbro has a subophitic texture. Alteration to chlorite and iddingsite occurs mostly between grain boundaries.

  • Thumbnail for KBR14
    KBR14

    Described by Western Minerals Inc. as 'porphyroblastic metasediments/hybrid rocks, interpreted by Eales and his coworkers as metamorphosed 'Red Beds' Formation sediments but conceivably magmatic in origin. The specimens illustrate the range in textures and compositions.' A common characteristic of all minerals in this thin section is that despite their natural habit, most minerals are elongate and frequently form cross-cutting, disparate but optically continuous, bladed crystals. It appears to be an almost dendritic intergrowth of all phases.

  • Thumbnail for JPN-6
    JPN-6

    Plagioclase is a much more abundant member of the groundmass in this basal than many other basalts in this suite. It, along with two pyroxene phases, comprise the poikilitic, subhedral phenocryst population. Plucking of both phases disrupts the quality of the thin section.

  • Thumbnail for JPN-4
    JPN-4

    Vesicles and a glassy matrix containing tiny plagioclase microlites separate this scoria's partially fragmental, partially resorbed, sometime poikilitic, sometimes glomeroporphyroclastic phenocrysts of plagioclase and pyroxenes.

  • Thumbnail for SC-7
    SC-7

    The groundmass of this microporphyritic basalt consists of glass and plagioclase microlites. Subhedral plagioclase phenocrysts are roughly aligned and some are concentrically zoned. Subhedral, plucked, clinopyroxene phenocrysts of variable size are less abundant than those of plagioclase.

  • Thumbnail for BATUR 1936
    BATUR 1936

    Subhedral phenocrysts of plagioclase, clinopyroxene, and olivine are squeezed into the fine web of rock that rims the massive vesicles of this scoria. Plagioclase has a sieve texture and is frequently zoned. The corners of most grains are rounded. Both clinopyroxene and olivine are generally equant in shape and olivine is more abundant than the pyroxene. All three phases show some degree of resorption. The groundmass contains moderately-sized crystals of all three phases. This sample is very fresh and unaltered.

  • Thumbnail for SYH-1F
    SYH-1F

    A contact between blueshist and an omphacite boudin is captured in this thin section. The blueschist side is strongly foliated due to aligned glaucophane with interspersed sphene and minor muscovite and chlorite. The contact itself is an aggregate of sphene with interstitial chlorite and clinozoisite. Omphacite is the dominant mineral on the other side of the contact, though some glaucophane, muscovite, sphene, and clinozoisite is present. Quartz rims surround reddish opaques.

  • Thumbnail for SC-14
    SC-14

    But for the anhedral quartz microphenocryss in this vesicular rhyolite, the rest is a clay-altered glass.

  • Thumbnail for JPN-5
    JPN-5

    Based on grain size, two populations of pyroxenes and plagioclase exist in this sample; the first are the fine-grained, equant crystals of the glassy groundmass, and the second, the subhedral to anhedral phenocrysts visible in handsample. The inconsistently-shaped plagioclase grains are sometimes zoned and frequently contain inclusions of glass.

  • Thumbnail for SC-13
    SC-13

    The least altered phase in this thin section is plagioclase, which forms roughly aligned, variably sized laths that make up both the groundmass, which is dominantly glass, and the phenocryst population. A second phenocryst, clinopyroxene, remains only as inclusions in the calcite pseudomorphs that replaced it. Vesicles, clays, and hematite pseudomorphs are abundant in this thin section.

  • Thumbnail for SYH-1CC
    SYH-1CC

    The foliation in this thin section, defined primarily by aligned glaucophane and clinozoisite, as well as strings of euhedral and aggregated sphene, wraps around larger, equant omphacite and glaucophane grains. The grain size is larger than many others in this suite and the foliation weaker.

  • Thumbnail for AMA004E
    AMA004E

    The elongate minerals, glaucophane, clinozoisite and muscovite define the foliation in this sample, which is tightly folded in a crenulation cleavage.

  • Thumbnail for GR-05
    GR-05

    The omphacite in this thin section is variably sized. Larger crystals are interspersed with granular aggregates; all are dusty due to alteration to clays. Interstitial muscovite is common and variation in birefringence indicates differing compositions or degrees of alteration of the micaceous phase.

  • Thumbnail for GR-11
    GR-11

    Stacked, elongate, monocrystalline calcite layers.

  • Thumbnail for GR-07
    GR-07

    Aligned muscovite crystals form a foliation with anhedral, interlobate, though elongated grains of quartz and k-feldspar. Grain boundaries are irregularly shaped.

  • Thumbnail for 2009 Colorado College Tiger Hockey
    2009 Colorado College Tiger Hockey

    Television commercial advertising Colorado College Tiger Hockey.