1-20 OF 38 RESULTS FOR

microdiamond

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
Published: 01 April 2020
American Mineralogist (2020) 105 (4): 498–509.
...‰. The diamond grains are 0.06–0.7 mm in size (i.e., they may be called microdiamonds) and are colorless to yellow-green in color ( Fig. 4 ). They are accompanied, in samples, with single grains of moissanite, milky-white corundum, various spinellides, sulfides, Cu-Sn alloys, and native iron, aluminum...
FIGURES | View All (14)
Journal Article
Journal: Geology
Published: 01 August 2019
Geology (2019) 47 (8): e475.
Journal Article
Journal: Geology
Published: 01 August 2019
Geology (2019) 47 (8): e476.
Journal Article
Journal: Geology
Published: 01 August 2019
Geology (2019) 47 (8): e477–e478.
Journal Article
Published: 07 May 2019
Geological Magazine (2019) 156 (11): 1949–1964.
...Katarzyna Walczak; Simon Cuthbert; Ellen Kooijman; Jarosław Majka; Matthijs A. Smit Abstract The first find of microdiamond in the Nordøyane ultra-high-pressure (UHP) domain of the Western Gneiss Region (WGR) of the Scandinavian Caledonides reshaped tectonic models for the region. Nevertheless...
FIGURES | View All (4)
Journal Article
Published: 01 June 2018
American Mineralogist (2018) 103 (6): 1002–1005.
... and microdiamond have been found. In ZSZ serpentinites, the new UHP assemblage predates the previously recognized HP-UHP paragenesis, which was recently dated at 65 Ma. This finding opens up a new interpretation for the petrologically and structurally well-constrained HP/UHP records, especially because all other...
FIGURES
Journal Article
Journal: Lithosphere
Published: 27 July 2017
Lithosphere (2018) 10 (1): 156–169.
...Xiangzhen Xu; Pierre Cartigny; Jingsui Yang; Yildirim Dilek; Fahui Xiong; Guolin Guo Abstract We report new δ 13 C data and N content and aggregation state values for microdiamonds recovered from peridotites and chromitites of the Luobusa ophiolite (Tibet) and chromitites of the Ray-Iz ophiolite...
FIGURES | View All (9)
Journal Article
Journal: Lithosphere
Published: 20 March 2017
Lithosphere (2018) 10 (1): 133–141.
...Kyaw Soe Moe; Jing-Sui Yang; Paul Johnson; Xiangzhen Xu; Wuyi Wang Abstract Microdiamonds ∼200 µm in size, occurring in ophiolitic chromitites and peridotites, have been reported in recent years. Owing to their unusual geological formation, there are several debates about their origin. We studied...
FIGURES | View All (8)
Journal Article
Published: 01 July 2016
American Mineralogist (2016) 101 (7): 1696–1699.
... 300 nA beam current and 200 ms dwell times. To avoid confusion, the abbreviation “P” is used only for phosphorous; pressure is written out in full except for the abbreviations “HP” and “UHP”. One example is from UHP microdiamond-bearing quartzofeldspathic lenses of “saidenbachite” in the gneiss...
FIGURES
Journal Article
Published: 01 February 2016
American Mineralogist (2016) 101 (2): 355–361.
... in ultrahigh-pressure quartzofeldspathic gneisses of the Kumdy-Kol area of the Kokchetav Massif, northern Kazakhstan. Maruyamaite contains inclusions of microdiamonds, and probably crystallized near the peak pressure conditions of UHP metamorphism in the stability field of diamond. Crystals occur as anhedral...
FIGURES | View All (4)
Journal Article
Journal: Geology
Published: 01 December 2014
Geology (2014) 42 (12): 1107–1110.
... are known from several occurrences worldwide. We report on the discovery of microdiamond in kyanite-garnet gneiss from allochthonous metasediments of the Seve Nappe Complex in the Scandinavian Caledonides. Our discovery calls for general reconsideration of existing exhumation models of deeply subducted...
FIGURES | View All (5)
Journal Article
Published: 01 August 2014
American Mineralogist (2014) 99 (8-9): 1798–1801.
... that kumdykolite contains 2 wt% CaO, probably indicating significant miscibility with the Ca-end-member svyatoslavite. Similar to the case of microdiamond inclusions, the kumdykolite-bearing multiphase inclusion is located in the Ca- and Mg-rich central part of the garnet and thus must have been trapped at P >...
FIGURES | View All (4)
Journal Article
Journal: Geology
Published: 01 July 2014
Geology (2014) 42 (7): e340.
Journal Article
Published: 01 December 2013
European Journal of Mineralogy (2013) 25 (6): 919–933.
...Maria Dolores Ruiz Cruz; Carlos Sanz De Galdeano Abstract Microdiamond inclusions in garnet have been identified in pre-Triassic schists of unknown age from the Torrox unit in the Alpujárride complex, Internal Zone of the Betic Cordillera, Spain. Prior to this, ultrahigh-pressure (UH P ) phases...
FIGURES | View All (9)
Journal Article
Journal: Elements
Published: 01 August 2013
Elements (2013) 9 (4): 261–266.
... metamorphism exists. Finding and analytically confirming the UHP index minerals coesite and microdiamond in grains only tens of microns in size is remarkably difficult. The improvement in microanalytical methods, micro-Raman spectroscopy, transmission electron microscopy (TEM), and secondary ion mass...
FIGURES | View All (7)
Journal Article
Journal: Elements
Published: 01 August 2013
Elements (2013) 9 (4): 248–250.
Journal Article
Journal: Lithosphere
Published: 01 August 2012
Lithosphere (2012) 4 (4): 269–285.
... ) and a garnet rim with microdiamond inclusions ( Massonne, 2003 ) were also reported from compositionally similar rocks of the Kokchetav Massif. This led Massonne (2003) to conclude that these rocks were also partially molten but to a lesser extent than the saidenbachite from the Erzgebirge. The maximum...
FIGURES | View All (10)
Journal Article
Published: 01 June 2011
The Canadian Mineralogist (2011) 49 (3): 673–690.
... are less than 0.5 mm in size (microdiamond). In contrast, diamond formation within the stability fields that comply with the crustal– mantle hypothesis presumes crystal growth up to 1 mm and greater. As estimated by Pal’yanov et al. (2002) , the minimum time required for growth of diamond crystals to one...
FIGURES | View All (15)
Journal Article
Published: 01 March 2011
European Journal of Mineralogy (2011) 23 (2): 157–168.
.... Microdiamond findings in peridotite bodies of the Caledonian Western Gneiss Region of Norway and the associated radiometric ages are a good illustration of how microscale observation and analysis can reveal a complex and multistage history, which can be traced back into the Archean ( e.g ., the review of van...
FIGURES | View All (8)
Journal Article
Published: 01 March 2010
European Journal of Mineralogy (2010) 22 (2): 189–198.
...Silke Schmidt; Thorsten J. Nagel; Nikolaus Froitzheim Abstract We describe a new locality with microdiamond-bearing, ultrahigh-pressure metamorphic rocks near the village Sidironero in the Rhodope Metamorphic Province in northern Greece, about 70 km west of the nearest known location at Xanthi...
FIGURES | View All (5)