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The sally free mafic complex and associated mafic rocks of

  • Mafic - Wikipedia

    Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro. Mafic rocks often also contain calcium-rich varieties of plagioclase


    Field evidence from the study area suggests that the FREE (N-MORB-like) mafic magmatism preceeded the LREE magmatism and that the LREE magmatism is spatially associated with a large unit of felsic, quartz and feldspar-phyric sediments and flows. Thus it is

  • Mafic mineral Article about mafic mineral by The Free

    (1) Melteigite is a dark colored plutonic rock that is part of the ijolite series and contains nepheline and 60-90% mafic minerals, especially green pyroxene. Podlesnoite Ba[Ca.sub.2](C[O.sub.3])[.sub.2][F.sub.2]: a new mineral species from the Kirovskii mine Khibiny, Kola Peninsula, Russia

  • [PDF] Subduction or sagduction? Ambiguity in constraining

    Abstract The Lewisian Complex of NW Scotland is a fragment of the North Atlantic Craton. It comprises mostly Archean tonalitetrondhjemitegranodiorite (TTG) orthogneisses that were variably metamorphosed and reworked in the late Neoarchean to Paleoproterozoic. Within the granulite facies central region of the mainland Lewisian Complex, discontinuous belts composed of ultramaficmafic

  • Origin of the Host Rocks and Mineralization of the North

    The apparent occurrence of both mafic volcanics and felsic crystal-lapilli tufts in the sequence strengthens the possibility that the problematical rocks may also be of volcanic origin. The possible occurrence of a fault in the valley occupied by North Lake could mean that the rocks east and west of the lake are genetically unre­

  • Origin of FeTi Oxide Ores in Mafic Intrusions: Evidence

    Dec 26, 2007· Maficultramafic intrusions in the PanXi region include the Panzhihua, Hongge, Baima, Taihe, and Xinjie intrusions. Zhou et al. (2002, 2005) and Zhong & Zhu showed that the intrusions are coeval with the associated Emeishan basalts, based on sensitive high-resolution ion microprobe UPb zircon geochronology of the intrusions and of the dykes that fed the basalts.

  • USGS Scientific Investigations Report 20105070I

    Nov 19, 2014· In the United States, the Duluth Complex in Minnesota, comprised of a group of mafic intrusions related to the 1.1 Ga Midcontinent Rift system, represents a major Ni resource of 8 Mt Ni, but deposits generally exhibit low grades (0.2 percent Ni, 0.66 percent Cu) and remain in the process of being proven economic.

  • Regional AI-Fe mafic magmas associated with anorthosite

    Apr 19, 1990· Samples of such magmas should also be sought in the country rocks surrounding the massifs. Here we report the widespread occurrence of AlFe mafic

  • Geochemical Systematics Among Amphibolitic Rocks in the

    Jul 11, 2011· terrane, the Carroll Knob mafic complex preserves chemical signatures suggestive of ocean crustal origins, similar to the Buck Creek mafic-ultramafic suite (Berger et al. 2001, Peterson et al., 2009). However, the amphibolites in the Carroll Knob complex indicate pyroxene-rich cumulate and gabbroic protoliths consistent with an active oceanic

  • Petrogenesis of the Bondla layered mafic-ultramafic

    Jun 10, 2009· The Bondla mafic-ultramafic complex is a layered intrusion that consists predominantly of peridotites and gabbronorites. A chromitite-pyroxenite-troctolite horizon serves as a marker to subdivide the intrusion into two zones. The Lower Zone displays gravity stratified layers of chromite that alternate with those of olivine, which up-section are followed by olivine+pyroxene-chromite cumulates.

  • 860 Ma mafic dikes and granitoids from the northern margin

    Sanligang granitoid intrusion and the spatially associated mafic dikes in the region is crucial for . 22. unravelling the tectonic evolution and continental crust growth processes in the Yangtze Block. Zircon . 23. U-Pb dating suggests that the mafic dikes (ca. 870 Ma) and granitoids (860 Ma) are contemporaneous. 24. The mafic dikes have low SiO. 2

  • (PDF) The Layered Mafic-Ultramafic Complexes of the

    Download Free PDF. Download Free PDF. The Layered Mafic-Ultramafic Complexes of the Ty64urwyktukltiyçocantins State, Central Brazil: Recently Discovered Large Proterozoic Intrusions with Favorable Potential to Host PGE Deposits Petrogenesis of Archean PGM-bearing chromitites and associated ultramaficmaficanorthositic rocks from the

  • Petrogenesis of Corundum-Bearing Mafic Rock in the Horoman

    Of all the mafic rocks documented from the Horoman complex, only the corundum-bearing mafic rock has preserved, at least partly, its high-pressure mineralogy; all of the others have been completely recrystallized at low pressures. The Type II mafic rocks were initially formed at <1·0 GPa as cumulates of olivine, plagioclase and clinopyroxene.

  • How to Classify Igneous Rocks Into (Ultramafic, Mafic

    Mafic rocks Rocks composed mostly of pyroxene, calcium-rich plagioclase, and minor amounts of olivine make up the mafic family of igneous rocks. The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid.

  • Field Geology and Petrologic Investigation of the

    The mafic and intermediate lavas of the Strawberry Volcanics include both tholeiitic and calc-alkaline compositions; calc-alkaline andesite is the dominant type by volume. 40Ar/39Ar ages of the mafic and intermediate lava flows range from 15.6 Ma to 12.5 Ma, and volume estimates of the intermediate lavas are approximately 1,100 km3. The magmas

  • Your use of this Ontario Geological Survey document (the

    INTRUSIVE ROCKS Carbonatite-alkalic intrusive suite (1.0 to 1.2 Ga): carbonatite, nepheline syenite, alkalic syenite, ijolite, fenite; associated mafic and ultramafic rocks Mafic and related intrusive rocks (Keweenawan age)j 31 a Logan and Nipigon sills (1109 Ma): diabase sills 31 b Pigeon River and Pukaskwa swarms: diabase dikes

  • USGS Scientific Investigations Report 20105070I

    Nov 19, 2014· In the United States, the Duluth Complex in Minnesota, comprised of a group of mafic intrusions related to the 1.1 Ga Midcontinent Rift system, represents a major Ni resource of 8 Mt Ni, but deposits generally exhibit low grades (0.2 percent Ni,

  • Geochemistry Volume 6 Geophysics Geosystems

    mafic and ultramafic intrusive rocks of plume origin. G, northern Guangxi mafic dykes and sills [Li et al., 1999]; H, Hannan mafic and ultramafic complex [Zhou et al., 2002; Su, 2004]; TG, Tongde-Gaojiacun mafic and ultramafic complex [Zhu et al., 2004]. Dashed line approximates the boundary of the Alxa massif. The pinkish solid circle

  • Early Carboniferous Magmatism and Rift Tectonics in the

    The Misho mafic complex (MMC) in NW Iran represents represents the product of late Paleozoic magmatism and rifting associated with the opening of Paleotethys, and provides significant geochronological and tectonic constraints for is paleogeography and evolution. Its mafic-ultramafic rocks represent an early Carboniferous plume-related

  • Proterozoic Mafic-Ultramafic Magmatic Events in the

    and mafic rocks (syenite, monzonite, melamonzonite, shonkinite) spatially associated with phlogopite-bearing ultramafic rocks (wehrlite, olivine clinopyroxenite, lherzolite, dunite, pyroxenite). The photograph in the bottom right corner shows outcropping phlogopite pyroxenite from the

  • Paired host-enclave geochemistry of mafic microgranular

    of mafic and felsic magmas (e.g Reid et al., 1983). The term enclave was proposed by Lacroix (1890) to describe fragments of rocks enclosed in homogeneous igneous rocks. Among the common enclaves in igneous rock are xenolith (piece of country rocks introduced into magmas), schlieren (elongated or lenticular enclave with gradual

  • The Layered Mafic-Ultramafic Complexes of the Tocantins

    The layered mafic and mafic-ultramafic intrusions of the Tocantins State are assigned to three groups on the basis of rock types, assemblage of cumulus minerals, geophysical anomalies and regional field association (Table 1). The Carreira Comprida Anorthosite (Fig. 1)

  • Metamorphism of Mafic Rocks

    1 l Mineral changes and associations along T-P gradients characteristic of the three facies series F Hydration of original mafic minerals generally required F If water unavailable, mafic igneous rocks will remain largely unaffected, even as associated sediments are completely re-equilibrated F Coarse-grained intrusives are the least permeable and likely to resist metamorphic changes

  • Mafic Vs. Felsic Rocks: Know the Difference - Science Struck

    Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. This is an order showing increased silica content. Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. Due to the color of the minerals forming them, the rocks

  • Sally PEHRSSON Research Scientist PhD Natural

    Deformed and metamorphosed mafic to ultramafic intrusive rocks are common along and adjacent to the Snowbird Tectonic Zone, a major Paleoproterozoic structure separating the Rae and Hearne cratons.


    Mar 19, 2015· These WEDB sequences include the Wedowee and Emuckfaw Groups of the Ashland-Wedowee-Emuckfaw belt, the Auburn and Loachapoka Formations of the Opelika Complex, the Jacksons Gap Group of the Brevard fault zone, the Hillabee Greenstone of the Talladega belt, and the Otto Formation-Sally Free Mafic Complex-Helen Group-New Georgia Group of the

  • Native metals and intermetallic compounds in subduction

    Dec 01, 2020· Plutonic rocks of the ILC plot into the field of arc ultramafic and mafic cumulates on the AFM diagram (Fig. 10a) and display major -element variations observed in ultramaficmafic plutons emplaced in other subduction environments such as Alaska (DeBari and Coleman, 1989), Kamchatka (Kepezhinskas et al., 1993) and the Cascades (Snoke et al

  • The growth of large mafic intrusions: Comparing

    Dec 15, 2012· Like the Mafic Complex of the Ivrea-Verbano Zone, it is affected by a pervasive high-T foliation and shows hypersolidus deformation structures, contains significant inclusions of country-rock paragneiss, and is subdivided into a Lower and an Upper Complex.

  • Minerals Free Full-Text Petrological Features of the

    The Nizhne-Derbinsk mafic-ultramafic complex is located between the Central Asian Orogenic Belt and the Siberian Craton and, is associated with the Ballyk fault. The largest, spatially related to each other, plutons in the central part of the complex are the Burlakski and Nizhne-Derbinsk. Rocks in the main units of these plutons are divided into three groups: peridotites (ultramafic

  • Mafic-Ultramafic Igneous Rocks And Associated Carbonatites

    INTRODUCTION The complex of mafic and ultramafic igneous rocks and associated carbonatites, herein formally designated the Gem Park Complex, underlies an area of about 2 square miles at Gem Park, a small oval valley in the northern Wet Mountains, Fremont and Ouster Counties, Colo., about 21 miles southwest of Canon City and about 11 miles northwest of Westcliffe which is designated as the type

  • PGE-bearing mafic-ultramafic sills in the floor of the

    The rocks of the region form part of the Pretoria Group of the Transvaal Supergroup, which dip at an angle of 5 to 10° to the west and strike broadly north to south. The farm Blaauwboschkraal 346JL is located some 10km to the north of Waterval Boven, 150km due east of Pretoria. Sulphide-bearing mafic-ultramafic rocks on Blaauwboschkraal were

  • Ore deposits associated with mafic magmas in the Kaapvaal

    Mafic and ultramafic magmatism played an important role in the 3.5 Ga long history of the Kaapvaal craton. The oldest (3.5 Ga) greenstone belts contain mafic and ultramafic volcanics that erupted in an oceanic environment, probably in oceanic plateaus. Then followed a series of continental flood basalts, from the 3.4 Ga old Commondale and Nondweni sequences, to the 180 Ma Karoo basalts.

  • Mafic Layered Intrusions -Chromite and Platinum PGE Deposits

    Oct 18, 2015· Another major groups of deposits in the mafic layered complexes are platinum group elements and chrome deposits but unlike copper nickel massive sulfides they dont form as puddles on the floor of the intrusions they form in discrete layers well up in the magma chamber. The PGEs thats platinum palladium, rhodium with less amounts of osmium, ruthenium and iridium are often but not

  • Mantle Response to Slab Breakoff in the North Qaidam

    Nov 11, 2020· The EMORB mafic rocks (440 Ma) exhibit relatively flatted REE patterns and positive Nd (t) values of +1.63 to +4.28, but high (87 Sr/ 86 Sr) i ratios of 0.706825 to 0.708979, indicting a derivation from partial melting of asthenospheric mantle, with involvement of enriched components probably derived from ambient lithospheric mantle or

  • Geology and petrography of the Nagar - Free Online Library

    Dec 31, 2014· The two main granitic rocks and the basement are intruded by dykes of mafic rocks (Fig. 3.7-3.8). Some are dark grey to black but the coarser ones look dioritic. The dykes are generally tens of centimeters to a couple of meters thick and some meters to 100 m in length but the largest one in the eastern mound is half a kilometer long and 2.5-3 m


    Mafic/Basaltic Composition - The name mafic refers to minerals with magnesium (ma-) and iron (-fic) in their chemical formulas, so they are also called ferromagnesian minerals. - They get their dark color from the abundant proportion of iron and magnesium in their chemical composition. o glossy black biotite o dark gray to black amphibole

  • Geology Field Trips - City University of New York

    Cortland ultramafic complex is a large body of differentiated mafic and ultramafic rocks, metamorphosed during Acadian orogeny, and also intruded by Acadian Peekskill granite. Well explore at Cortland petrography aspects of mafic and ultramafic rocks including a hornblende rich rock

  • Mineral potential for nickel, copper, platinum group

    PRISM-I summary documents mention the presence of mafic-ultramafic igneous intrusive rocks in several areas of Mauritania and a number of chromium (Cr) and copper-nickel (Cu-Ni (±Co, Au)) occurrences associated with them. Permissive geologic settings generally include greenstone belts of any age, layered mafic-ultramafic and unlayered gabbro-anorthosite intrusive complexes in cratonic

  • Metamorphic Facies

    Metamorphism of Mafic Rocks Mineral changes and associations along T -P gradients characteristic of the three facies series Hydration of original mafic minerals generally required If water unavailable, mafic igneous rocks will remain largely unaffected, even as associated sediments are completely re -

  • The mafic and ultramafic rocks of the Mocksville complex

    The Mocksville complex is the largest mafic-ultramafic complex in the in Charlotte terrane; yet there are very limited geochemical and petrological studies of the intru-sive mafic and ultramafic rocks in the complex. Given the importance of petrological and geochemical studies men-tioned above, this work is a preliminary study that

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