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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Burundi (1)
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Antarctica
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rutile (1)
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Primary terms
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Africa
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Central Africa
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Burundi (1)
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Gabon (1)
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Antarctica
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Enderby Land (1)
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Asia
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Far East
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China
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Qaidam Basin (1)
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Australasia
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Australia
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Europe
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lead (1)
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Pacific Ocean
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United States
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The first occurrence of the carbide anion, C 4– , in an oxide mineral: Mikecoxite, ideally (CHg 4 )OCl 2 , from the McDermitt open-pit mine, Humboldt County, Nevada, U.S.A.
The Distinctive Mineralogy of Carbonatites
Mineral extinction
Gaildunningite, Ideally Hg 2+ 3 [NHg 2+ 2 ] 18 (Cl,I) 24 , a New Mineral from the Clear Creek Mine, San Benito County, California, USA: Description and Crystal Structure
Quantifying lithophilicity, chalcophilicity and siderophilicity
The crystal structure of ceruleite, CuAl 4 [AsO 4 ] 2 (OH) 8 (H 2 O) 4 , from Cap Garonne, France
Crystal-chemical aspects of the roméite group, A 2 Sb 2 O 6 Y , of the pyrochlore supergroup
Hydroxykenoelsmoreite, the first new mineral from the Republic of Burundi
Hydroxyferroroméite, a new secondary weathering mineral from Oms, France
The crystal chemistry of elsmoreite from the Hemerdon (Drakelands) mine, UK: hydrokenoelsmoreite-3 C and hydrokenoelsmoreite-6 R
Discreditation of partzite
The creation of neotypes for hydrotalcite
The relationship between mineral composition, crystal structure and paragenetic sequence: the case of secondary Te mineralization at the Bird Nest drift, Otto Mountain, California, USA
The Great Barrier Reef Expedition 1928–29: The crystal structure and occurrence of weddellite, ideally CaC 2 O 4 ·2.5H 2 O, from the Low Isles, Queensland
Abstract Five shale samples preserved from the oil window of four unconventional reservoirs were solvent-extracted using toluene and methanol for high-resolution, secondary-electron imaging with field emission scanning electron microscopy (SEM) of the textures of organic matter (OM) present at or near induced fracture surfaces. The samples represent calcareous, siliceous, and mixed mineralogy mudrocks. Based on their nanoscopic textures, nine categories of OM could be distinguished: (1) nonporous particles, (2) low-porosity masses (sometimes [3] with mineral crystallites), (4) spherule aggregates, (5) intermediate-porosity granular masses, and (6) high-porosity foamy frameworks between mineral grains, together with (7) thick, (8) thin, or (9) very thin coats on mineral surfaces. The frequency of occurrence of these OM categories was qualitatively assessed from all images and compared to those from siliceous gas-window maturity Barnett Shale. The various morphologies are interpreted to comprise types of kerogen, bitumen, and asphaltenic residues, and transformations between them due to maturation and migration are proposed. After the first stage of cleaning and imaging, the samples were re-cleaned with stronger solvents for re-imaging at the same locations. Chloroform/methanol azeotrope only mobilized the very thin coats on clays, which presumably comprise asphaltenic nanoparticles deposited from crude oil as later-stage wettability alteration in the reservoir. Tetrahydrofuran effected only a slight swelling of mature bitumen, while pyridine (at higher temperature) apparently induced further bitumen production from kerogen and partially dissolved some preexisting bitumen but did not dissolve most of the OM present.