نتایج جستجو برای: mafic migmatites

تعداد نتایج: 2136  

2011
C. M. Pieters S. Besse J. Boardman B. Buratti L. Cheek R. N. Clark J. P. Combe D. Dhingra J. N. Goswami R. O. Green J. W. Head P. Isaacson R. Klima G. Kramer S. Lundeen E. Malaret T. McCord J. Mustard J. Nettles N. Petro C. Runyon M. Staid J. Sunshine L. A. Taylor K. Thaisen S. Tompkins J. Whitten

[1] High‐resolution compositional data from Moon Mineralogy Mapper (M) for the Moscoviense region on the lunar farside reveal three unusual, but distinctive, rock types along the inner basin ring. These are designated “OOS” since they are dominated by high concentrations of orthopyroxene, olivine, and Mg‐rich spinel, respectively. The OOS occur as small areas, each a few kilometers in size, tha...

2015
L. M. Jozwiak W. Head

2755. [19] Wieczorek, M. A. et al. (2013) Science 339, 671-675. Figure 1: Locations of floor-fractured craters [2] plotted on a basemap of crustal thickness [19]. Floor-fractured craters are preferentially located in regions of intermediate (20-30 km) crustal thickness. Mare deposits are located primarily on the lunar nearside and in regions of thinner crust. Figure 2: Crater Buch B (17.0°E, 39...

Journal: :Anais da Academia Brasileira de Ciencias 2006
Renato J Leite Valdecir A Janasi Lucelene Martins

The Piedade Granite (approximately 600 Ma) was emplaced shortly after the main phase of granite magmatism in the Agudos Grandes batholith, Apiaí-Guaxupé Terrane, SE Brazil. Its main units are: mafic mineral-rich porphyritic granites forming the border (peraluminous muscovite-biotite granodiorite-monzogranite MBmg unit) and core (metaluminous titanite-bearing biotite monzogranite BmgT unit) and ...

2006
P. G. Lucey

Introduction: Several types of magnesian highlands rocks occur in the lunar samples including the mafic Mg-suite rocks, magnesian feldpathic granulites, and magnesian anorthosites. Some mafic magnesian rocks are easily accommodated into the magma ocean model, as large variations in Mg/Fe are expected as the magma ocean crystallizes, forming source regions for magnesian melts. The origin of othe...

K.R. Praveen P. Pratheesh V. Prasannakumar

Cretaceous mafic dykes in the Moyar Shear Zone (MSZ) area, north Kerala, India, provide signatures to probe into the nature of their source and thereby the evolution of the Mesozoic lithospheric mantle beneath the South Indian Granulite Terrain (SIGT). Bulk of the dykes in northern parts of Kerala is broadly in spatial association with the shear system. Mafic dykes striking NE-SW, NWSE, NNW-SSE...

ترکیان, اشرف,

The study area is located in the southern part of Qorveh granitoid complex. Investigation of textural and mineral chemistry evidence in granitoid host with composition of granodiorite, granite, qtz-monzonite, and mafic microgranular enclave (MME) with composition of qtz-diorite to meladiorite, are focused in this paper. Microscopic study and data of microprobe analyses in host and enclave rocks...

Journal: :زمین شناسی اقتصادی 0
مریم آهنکوب احمد جهانگیری محسن مؤید

misho intrusions outcrop in the southern part of north tabriz fault, east misho mountains, nw tabriz. filed studies, petrological and geochemical data show that both mafic and felsic rock types occur in the area. mafic rocks include gabbro consisting of plagioclase, clinopyroxene, olivine and opaque minerals and felsic bodies consist of alkali granite with k-feldspar, quartz, plagioclase and a ...

2008
P. J . LANCASTER B. FU F. Z. PAGE N. T. KITA M. E. BICKFORD B. M. HILL J. W. VALLEY

Oxygen isotope ratios and rare earth element (REE) concentrations provide independent tests of competing models of injection v. anatexis for the origin of migmatites from amphibolite and granulite facies metasedimentary rocks of the Adirondack Mountains, New York. Values of dO and REE profiles were measured by ion microprobe in garnet–zircon pairs from 10 sample localities. Prior U–Pb SIMS dati...

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