1-20 OF 92 RESULTS FOR

nordmarkite

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Journal: Economic Geology
Published: 01 June 2019
Economic Geology (2019) 114 (4): 719–744.
...Yan Liu; Zengqian Hou; Rongqing Zhang; Ping Wang; Jianfeng Gao; Markus B. Raschke Abstract Zircon is a common accessory mineral in igneous rocks, including carbonatite-nordmarkite complexes. Zircons can record radiation damage and hydrothermal alteration through changes in oxygen isotope values...
FIGURES | View All (18)
Journal Article
Published: 01 April 1972
The Canadian Mineralogist (1972) 11 (2): 552–553.
Image
Outcrop photographs of <span class="search-highlight">nordmarkite</span>. (A) Barite-fluorite-quartz vein in nord...
Published: 01 June 2019
Fig. 3. Outcrop photographs of nordmarkite. (A) Barite-fluorite-quartz vein in nordmarkite, Maoniuping deposit (modified from Liu et al., 2015a ). (B) Biotite-aegirine-augite-arfvedsonite-bastnäsite–bearing ore veins, Maoniuping deposit (modified from Liu and Hou, 2017 ). (C) Nordmarkite from
Image
Transmitted-light microscopic images of zircons from the Mianning-Dechang R...
Published: 01 June 2019
Fig. 4. Transmitted-light microscopic images of zircons from the Mianning-Dechang REE belt. (A, B) Type I zircons in nordmarkite. (C) Type II zircons in nordmarkite with a slightly dusty appearance. (D) Type III zircons in nordmarkite exhibiting heavy alteration and cloudy inner regions.
Image
OM-CL image of a zircon grain from a <span class="search-highlight">nordmarkite</span> sample from Khaldzan Bureg...
Published: 01 August 2008
F ig . 13. OM-CL image of a zircon grain from a nordmarkite sample from Khaldzan Buregte, Mongolia, showing a turquoise tint of luminescence caused by significant Dy 3+ emission as revealed by SEM-CL spectroscopy.
Image
Plots of (A) SiO 2  versus Na 2 O + K 2 O (after  Middlemost, 1994 ), (B) S...
Published: 01 June 2019
Fig. 12. Plots of (A) SiO 2 versus Na 2 O + K 2 O (after Middlemost, 1994 ), (B) SiO 2 versus Na 2 O + K 2 O + CaO (after Frost et al., 2001 ), (C) SiO 2 versus K 2 O (after Peccerillo and Taylor, 1976 ), and (D) A/CNK versus A/NK for fresh nordmarkite, nordmarkite after fenitization
Journal Article
Journal: Economic Geology
Published: 01 May 2024
Economic Geology (2024) 119 (3): 681–712.
..., Sichuan (southwestern China), is characterized by a complex vein system that evolved within metamorphosed supracrustal rocks of the Yangxin and Mount Emei Formations. The mineralization is coeval with Oligocene intrusions of carbonatite and nordmarkite at ~27 Ma. The major gangue minerals include fluorite...
FIGURES | View All (14)
Journal Article
Published: 01 May 1964
Geological Magazine (1964) 101 (3): 274–281.
...Richard Langdon Johnson Abstract "The Marumbe complex is a small ring-intrusion consisting essentially of a plug of nordmarkite separated from the basalt country rocks by a later ring-dyke and roof-sheet of granite. The lower and upper surfaces of a screen of basalt, which lies between the top...
Image
Schematic model of the formation of type I, II, and III zircons and REE min...
Published: 01 June 2019
Fig. 16. Schematic model of the formation of type I, II, and III zircons and REE mineralization stages in the Mianning-Dechang REE deposits. (A) In the fresh carbonatite-nordmarkite complex (stage I), type I zircons are fresh and unaltered. (B) In the fenitized carbonatite-nordmarkite complex
Image
(A) Simplified geologic map showing the distribution of carbonatite-alkalin...
Published: 01 June 2019
, Chinese Academy of Geological Sciences, unpub. data, 2008). (C) Schematic geologic map showing the key features of the nordmarkite-carbonatite complex and associated REE orebodies within the Lizhuang deposit (modified from Hou et al., 2009 ). (D) Geologic map showing the key features of the nordmarkite
Image
Photomicrographs showing the key textural characteristics of ore veins and ...
Published: 01 May 2024
xenocrysts (Mc) in (A). (C) Coarse-grained sparry Sr-rich barite (Brt1) replaced by a cavernous aggregate of fine-grained Sr-poor variety (Brt2). (D, E) Fenitized nordmarkite xenoliths, composed of quartz (Qtz), microcline replaced and overgrown by albite (Ab), and diopside-aegirine-augite (Cpx) replaced
Journal Article
Published: 01 April 1999
Mineralogical Magazine (1999) 63 (2): 165–177.
...U. Kempe; J. Goetze; S. Dandar; D. Habermann Cathodoluminescence (CL) imaging and spectroscopy, as well as backscattered electron imaging, were used to assign the occurrence of several mineral phases and rock structures in altered nordmarkites and calcite-bearing granites from the Nb-Zr-REE...
Journal Article
Published: 01 August 1936
American Mineralogist (1936) 21 (8): 516–522.
...Robert Balk; Philip Krieger Abstract The stock of gabbro and nordmarkite penetrating the ancient gneisses and phyllites of Ascutney mountain, Vermont, is associated with various dike rocks. Among the leucocratic types, and probably connected with the nordmarkite, Daly 1 describes paisanitic dikes...
Image
SHRIMP zircon U-Pb ages for <span class="search-highlight">nordmarkites</span> from (A, B) Maoniuping (type II), ...
Published: 01 June 2019
Fig. 10. SHRIMP zircon U-Pb ages for nordmarkites from (A, B) Maoniuping (type II), (C) Diaoloushan (types I, II), and (D) Lizhuang (types I, III) deposits. MSWD = mean standard of weighted deviates.
Image
Histograms of SHRIMP U-Pb zircon ages for <span class="search-highlight">nordmarkites</span> from (A) Dalucao (ty...
Published: 01 June 2019
Fig. 15. Histograms of SHRIMP U-Pb zircon ages for nordmarkites from (A) Dalucao (type I zircons), (B) Maoniuping (types I and II zircons), (C) Lizhuang (types I and III zircons), and (D) Diaoloushan (types I and II zircons) deposits.
Journal Article
Published: 01 August 2004
Mineralogical Magazine (2004) 68 (4): 541–559.
... of opaque oxides may represent pseudomorphs of original mafic phases. The rocks of the Nordmarkite Swarm are medium- to coarse-grained quartz-microsyenites, with phenocrysts of turbid alkali feldspar (largely perthitic, but also including discrete sub-crystals of microcline and albite) in a medium...
FIGURES | View All (7)
Image
Radiogenic isotopic compositions of ore veins, <span class="search-highlight">nordmarkites</span>, and marbles fr...
Published: 01 May 2024
Fig. 12. Radiogenic isotopic compositions of ore veins, nordmarkites, and marbles from the Zhengjialiangzi camp (this work) and other carbonatite occurrences. (A) Sr-Nd isotope variations. (B) Pb isotope variations. (C) Nd-Pb isotope variations. The compositions of carbonatites from East Africa
Journal Article
Published: 03 July 2015
Geological Magazine (2016) 153 (1): 128–142.
... nordmarkite zone of the Kangerlussuaq Syenite. This study presents the first U–Pb zircon ages from the alkaline units of the Kærven Complex. Fourteen multi-grain zircon fractions have been analysed by thermal ionization mass spectrometry (TIMS). Absolute age differences could not be resolved between...
FIGURES | View All (7)
Journal Article
Journal: Economic Geology
Published: 01 May 1995
Economic Geology (1995) 90 (3): 530–547.
..., as shown by the development of a major dike complex synchronous with granite emplacement. The massif consists of peralkaline granitoids, as well as gabbro and basalt, and is characterized by a radial-circular shape. Eight intrusive phases are recognized and consist of (1) nordmarkite, (2) peralkaline...
Journal Article
Journal: Economic Geology
Published: 01 November 1993
Economic Geology (1993) 88 (7): 1830–1849.
... activity leading to skarn formation and locally to ore deposition in the contact aureoles. Stable isotope and fluid inclusion data have been used to constrain the composition and evolution of skarn-forming fluids at a roof pendant situated on the eastern margin of the large Nordmarkite (syenite) batholith...