Item talk:Q48292
From geokb
{
"USGS Staff Profile": { "@context": "https://schema.org", "@type": "Person", "dateModified": "2024-09-21T07:57:46.571333", "name": "Leonid Neymark", "identifier": [ { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0003-4190-0278" } ], "jobTitle": "Research Chemist", "hasOccupation": [ { "@type": "OrganizationalRole", "startDate": "2024-09-21T07:57:46.579297", "affiliatedOrganization": { "@type": "Organization", "name": "Geology, Geophysics, and Geochemistry Science Center", "url": "https://www.usgs.gov/centers/gggsc" }, "roleName": "Research Chemist" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "Research Chemist, Geology, Geophysics, and Geochemistry Science Center, USGS" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "Principal investigator and member of the Geochemistry Team in the Yucca Mountain Project Branch, USGS" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "2001-2004. S.M. Stoller Corporation, Senior Geochemist" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "1996-2001. Pacific Western Technologies, Ltd. Senior Scientist" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "1993-1996. US Geological Survey Visiting Research Scientist" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "1985-1993. Institute of Precambrian Geology and Geochronology (IPGG), St. Petersburg, Russian Academy of Sciences" }, { "@type": "Occupation", "additionalType": "self-claimed professional experience", "name": "1971-1985. All Union Geological Research Institute, Leningrad (USSR Ministry of Geology). Engineer (1971-1981) and Junior Research Scientist (1981-1985)" } ], "description": [ { "@type": "TextObject", "additionalType": "short description", "abstract": "Research Chemist with the Geology, Geophysics, and Geochemistry Science Center" }, { "@type": "TextObject", "additionalType": "staff profile page introductory statement", "abstract": "Leonid Neymark is a Scientist Emeritus with the Geology, Geophysics, and Geochemistry Science Center." }, { "@type": "TextObject", "additionalType": "personal statement", "abstract": "I am currently a Scientist Emeritus in the Geology, Geophysics, and Geochemistry Science Center after being transferred from the Geochemistry Team, Yucca Mountain Project Branch where I conducted U-series studies of soils, fracture minerals and water-rock interaction processes.I conduct a wide spectrum of isotope-geochemical studies involving radiogenic isotopes of U, Pb, Sr, and Nd and using ICP-MS and TIMS techniques. Before 2010 I was a principal investigator and a member of the Geochemistry Team in the Yucca Mountain Project Branch, WRD. The team's task was to evaluate geochemical aspects of the hydrogeologic suitability of Yucca Mountain to permanently store high-level radioactive waste. My focus was on the history of secondary mineral deposition (largely calcite and silica) in soil and unsaturated- and saturated-zone settings and on isotope-geochemical indicators of water-rock interaction as evidence of past water flow. These studies used U-Pb and U-series and other isotope-geochemical methods to characterize the timing of low-temperature surface processes of mineral deposition and to evaluate past water-rock interaction. In 2004 I was closely involved in the installation and detailed testing of a new ThermoFinnigan thermal-ionization mass-spectrometer Triton. I developed reproducible mass-spectrometric methods of U-series isotope measurements for whole rock samples with large Th/U and 232Th/230Th ratios. Previous YMPB work included systematic characterization of subsurface and soil hydrogenic minerals to provide a basis for understanding past hydrologic and climate variability in the Yucca Mountain region.Current ProjectsSources of Pb contamination in domestic well water in SW MissouriMatrix Pore Waters - Ultracentrifugation Method for Low-Permeability Sedimentary and Crystalline RocksThe U-Th-Pb whole-rock isotope system in the Chalk River core and past redox conditionsImpact of Exhalative Hydrothermal Systems on Marine Chemistry: Applications for Mineral AssessmentConditions and Processes Affecting Radionuclide Transport (writing a chapter for the GSA Memoir devoted to Yucca Mountain, volume 2" } ], "email": "lneymark@usgs.gov", "url": "https://www.usgs.gov/staff-profiles/leonid-neymark", "affiliation": [ { "@type": "Organization", "name": "American Geophysical Union" }, { "@type": "Organization", "name": "Geological Society of America" }, { "@type": "Organization", "name": "International Geochemistry Association" }, { "@type": "Organization", "name": "Geochemical Society" } ], "hasCredential": [ { "@type": "EducationalOccupationalCredential", "name": "Ph.D. in Geochemistry, St. Petersburg, Russia" }, { "@type": "EducationalOccupationalCredential", "name": "MS degree in Radiochemistry, St. Petersburg, Russia" } ], "knowsAbout": [ { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "geochemistry" }, { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "soil chemistry" }, { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "water chemistry" }, { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "mineral resources" }, { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "isotopic analysis" }, { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "isotope geochemistry" }, { "@type": "Thing", "additionalType": "self-claimed expertise", "name": "geochronology" } ], "memberOf": { "@type": "OrganizationalRole", "name": "staff member", "member": { "@type": "Organization", "name": "U.S. Geological Survey" }, "startDate": "2024-09-21T07:57:46.571336" } }, "ORCID": { "@context": "http://schema.org", "@id": "https://orcid.org/0000-0003-4190-0278", "@reverse": { "creator": { "@id": "https://doi.org/10.3390/min11111166", "@type": "CreativeWork", "identifier": { "@type": "PropertyValue", "propertyID": "doi", "value": "10.3390/min11111166" }, "name": "Pb-Pb and U-Pb Dating of Cassiterite by In Situ LA-ICPMS: Examples Spanning ~1.85 Ga to ~100 Ma in Russia and Implications for Dating Proterozoic to Phanerozoic Tin Deposits" } }, "@type": "Person", "familyName": "Neymark", "givenName": "leonid", "mainEntityOfPage": "https://orcid.org/0000-0003-4190-0278" }, "OpenAlex": { "created_date": "2023-07-21", "display_name": "Leonid A. 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