1-20 OF 45 RESULTS FOR

osmium

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 March 2018
Economic Geology (2018) 113 (2): 439-461.
... (NTIMS). Approximately 20 to 300 mg was weighted, mixed with 185 Re- 190 Os and 191 Ir- 99 Ru- 105 Pd- 194 Pt spikes, and digested using the Carius Tube technique with 4 ml of concentrated HCl and 5 ml of concentrated HNO 3 at 230°C for ~72 h ( Shirey and Walker, 1995 ). Osmium was extracted...
FIGURES | View All (11)
Journal Article
Journal: Geology
Published: 17 January 2018
Geology (2018) 46 (3): 239-242.
..., Figures DR1–DR4 and Tables DR1 and DR2, is available online at http://www.geosociety.org/datarepository/2018/ or on request from editing@geosociety.org . REFERENCES CITED Alves , S. , Schiano , P. , Capmas , F. , and Allegre , C.J. , 2002 , Osmium isotope binary mixing...
FIGURES | View All (4)
Journal Article
Journal: Lithosphere
Published: 25 May 2017
Lithosphere (2017) 10 (1): 95-108.
... : Chemical Geology , v. 288 , p. 133 – 148 , doi:10.1016/j.chemgeo.2011.07.011. Dale , C.W. , Gannoun , A. , Burton , K.W. , Argles , T.W. , and Parkinson , I.J. , 2007 , Rhenium-osmium isotope and elemental behaviour during subduction of oceanic crust and the implications...
FIGURES | View All (8)
Series: GSA Special Papers
Published: 01 September 2014
DOI: 10.1130/2014.2505(13)
..., late Rhaetian “initial” negative δ 13 C org excursion is divided into two subpeaks, each corresponding to hot and humid events, separated by a cooler and drier event. The upper subpeak is also associated with perturbation of the osmium isotope system (attributed to volcanic fallout), and darkened...
Series: GSA Special Papers
Published: 01 January 2014
DOI: 10.1130/2014.2503(03)
... on lithological criteria, enrichment of iridium and osmium, and osmium isotope ratios. The impact claystone also contains a Cyathidites fern spike. The first continuous lignite horizon in the section immediately overlies this claystone and represents the Hell Creek–Fort Union formational contact. A tuff ~3 m...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(20)
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2418(09)
Journal Article
Journal: Geology
Published: 01 March 2002
Geology (2002) 30 (3): 267-270.
... 13 11 2001 Geological Society of America 2002 Triassic-Jurassic boundary rhenium osmium Central Atlantic magmatic province Pangea Rhaetian The global changes that occurred across the Triassic-Jurassic (Tr- J) boundary had a profound effect on Earth's subsequent history...
FIGURES
Journal Article
Journal: Economic Geology
Published: 01 September 2001
Economic Geology (2001) 96 (6): 1323-1342.
FIGURES | View All (10)
Journal Article
Journal: Economic Geology
Published: 01 September 2001
Economic Geology (2001) 96 (6): 1455-1459.
... and both are dissolved using an alkaline fusion. Osmium is separated as OsO4 from an H 2 SO 4- H 2 O 2 solution by double distillation. Rhenium is recovered from the remaining solution by anion exchange. A modified version of the Carius tube method ( Shirey and Walker, 1995 ) was used for the Re-Os...
FIGURES
Journal Article
Published: 01 April 2001
The Canadian Mineralogist (2001) 39 (2): 421-446.
FIGURES | View All (7)
Journal Article
Published: 01 April 2001
The Canadian Mineralogist (2001) 39 (2): 447-471.
FIGURES | View All (14)
Journal Article
Published: 01 April 2001
The Canadian Mineralogist (2001) 39 (2): 473-490.
... al. 1998c , 2000 ). Trace-element analysis of the melt inclusions has provided some new and very important insights into the level of contamination experienced by the Abitibi komatiites during emplacement. Osmium isotopic analysis of the Alexo komatiites has further demonstrated that crustal...
FIGURES | View All (10)
Journal Article
Journal: Geology
Published: 01 June 2000
Geology (2000) 28 (6): 555-558.
... porphyry copper deposits. Seven ore deposits that reside in different tectonic terranes and represent distinct epochs of mineralization in Chile were studied. The initial osmium ratios of the first stage of mineralization at each of the deposits range from 0.15 to 5. These values are more radiogenic than...
FIGURES
Journal Article
Journal: Geology
Published: 01 June 2000
Geology (2000) 28 (6): 563-566.
... , Separation of osmium from geological materials by solvent extraction for analysis by thermal ionisation mass spectrometry : Analytica Chimica Acta , v. v. 332 pp. 269 ’ 275 . Ellam , R.M. , Carlson , R.W. , and Shirey , S.B. , 1992 , Evidence from Re-Os isotopes for plume-lithosphere...
FIGURES
Journal Article
Journal: Geology
Published: 01 May 2000
Geology (2000) 28 (5): 475-478.
... 2000 22 10 1999 14 02 2000 Geological Society of America 2000 black shale weathering osmium platinum group elements rhenium The importance of black shales for the marine Os budget was realized ( Ravizza and Turekian, 1989 , 1992 ; Ravizza et al., 1991 ) before...
FIGURES | View All (4)
Journal Article
Journal: Economic Geology
Published: 01 May 2000
Economic Geology (2000) 95 (3): 539-548.
... evidence concerning the formation of macroscopic (~ μ m in size) platinum-group mineral grains, the authors have studied the osmium isotope ratios in PGM grains from the Freetown peninsula in Sierra Leone using an ion microprobe. Indirect isotopic evidence and modeling are required to infer their origin...
FIGURES | View All (5)
Journal Article
Journal: Geology
Published: 01 November 1999
Geology (1999) 27 (11): 971-974.
Journal Article
Journal: Geology
Published: 01 October 1999
Geology (1999) 27 (10): 923-926.