SPECIAL NOTICE
B -- B--ISOTOPIC ANALYSIS OF ZIRCON
- Notice Date
- 8/9/2022 10:44:21 AM
- Notice Type
- Special Notice
- NAICS
- 541380
— Testing Laboratories
- Contracting Office
- OFFICE OF ACQUISITON GRANTS SACRAMENTO CA 95819 USA
- ZIP Code
- 95819
- Solicitation Number
- 140G0322Q0206
- Response Due
- 8/12/2022 2:00:00 PM
- Archive Date
- 09/30/2022
- Point of Contact
- Deng, Yangzhi, Phone: 916-278-9326
- E-Mail Address
-
yangzhideng@usgs.gov
(yangzhideng@usgs.gov)
- Description
- ISOTOPIC ANALYSIS OF ZIRCON Notice of Intent This is a notice of intent to solicit from a single source. The U.S. Geological Survey (USGS), intends to award a purchase order to Jack Satterly Geochronology lab at University of Toronto for providing services on U-Pb isotopic analysis of zircon by CA-ID-TIM. Award will be made in accordance with Federal Acquisition Regulation (FAR) 13.106-1(b) and the procedures at FAR Part 12 entitled, Acquisition of Commercial Items and FAR Part 13 entitled, Simplified Acquisition Procedures. The USGS requires additional isotopic analyses of zircon to determine the age of igneous rocks that are associated with and host the J-M Reef platinum group element deposit in Montana. For consistency, it is paramount that the University of Toronto conducts the analyses of these additional samples. The purpose of this notice is to satisfy the requirements of FAR Subpart 5.101(a)(1) and FAR 5.2. This notice of intent is not a request for competitive quotes. However, all responsible parties may submit a quotation by the closing date of this announcement which shall be considered by the agency. No solicitation will be issued. A determination not to compete this action based upon responses received is in the sole discretion of the Government. The NAICS code for this action is 541380, Testing Laboratory. Responses or inquiries shall only be accepted through electronic mail addressed to yangzhideng@usgs.gov and must be uploaded and received in their entirety no later than August 12, 2022 at 1700 ET. Responses submitted by hardcopy or any web portal shall not be accepted or considered. Statement of Work I. GENERAL INFORMATION A. Introduction The USGS Geology, Minerals, Energy, and Geophysics (GMEG) Science Center requires U-Pb chemical abrasion isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) analyses of zircon and baddeleyite separates collected from the Stillwater Complex in Montana. These analyses will support on-going research being conducted for critical commodity studies of mineralized rocks in the complex. B. Background U-Pb CA-ID-TIMS analyses performed on zircon and baddeleyite minerals are used to determine highly precise ages of igneous rocks. For this project, the precise age determination of individual layers of igneous rock within the Stillwater Complex help constrain the crystallization history and the origin of the igneous rocks that host the PGE-rich sulfide mineralization in the J-M Reef deposit. C. Definitions/Applicable Documents The primary use of the U-Pb CA-ID-TIMS method is to date age Zr-minerals in igneous rocks. Highly precise determinations of 207Pb/206Pb isotopic ratios with 2 sigma errors of ~0.01% can be achieved by analyzing multiple, concordant, and internally corrected for U and Pb fractionation, U-Pb data that correspond to 2 sigma age errors of <~200,000 years for rocks that are billions of years old. These age determinations are precise enough to distinguish the crystallization age of individual layers in layered mafic intrusions. Reviews of the CA-ID-TIMS method and its application to layered intrusions can be found in the following review papers: Condon, D. J., Schoene, B., McLean, N. M., Bowring, S. A., & Parrish, R. R. (2015). Metrology and traceability of U-Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I). Geochimica et Cosmochimica Acta, 164, 464�480. https://doi.org/10.1016/j.gca.2015.05.026 Gerstenberger, H., & Haase, G. (1997). A highly effective emitter substance for mass spectrometric Pb isotope ratio determinations. Chemical Geology, 136(3�4), 309�312. https://doi.org/10.1016/S0009-2541(96)00033-2 Jaffey, A. H., Flynn, K. F., Glendenin, L. E., Bentley, W. C., & Essling, A. M. (1971). Precision measurement of half-lives and specific activities of U235 and U238. Physical Review C, 4(5), 1889�1906. https://doi.org/10.1103/PhysRevC.4.1889 Mattinson, J. M. (2005). Zircon U-Pb chemical abrasion (�CA-TIMS�) method: Combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages. Chemical Geology, 220(1�2), 47�66. https://doi.org/10.1016/j.chemgeo.2005.03.011 Scoates, J. S., & Wall, C. J. (2015). Geochronology of layered intrusions. In B. Charlier, O. Namur, R. Latypov, & C. Tegner (Eds.), Layered Intrusions (pp. 3�74). Springer Geology. T.E.Krogh. (1973). A low-contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations. Geochimica et Cosmochimica Acta, 87, 485�494. D. Scope In collaboration with the Stillwater Mine and East Boulder Mine, we have collected five samples for whole-rock major, minor, and trace element geochemistry, polished thin section, and heavy mineral separation. Based on igneous rock texture, we have collected samples most prospective to contain Zr minerals for age determination. The samples were selected to test the hypothesis that the stratigraphic sequence of the layers does not obey the law of superposition. Sampling focuses on rocks in and around the layer that is being mined for platinum and palladium. II. WORK REQUIREMENTS A. Technical Requirements 1. Work Requirements/Products The USGS will provide 7 samples or mineral separates from samples to the laboratory manager. The laboratory manager (and assistants) will perform the necessary rock crushing, heavy liquids, and magnetic mineral separation to collect zircon and baddeleyite; chemically abrade zircon and baddeleyite to remove metamict rims; perform ID-TIMS analyses; acquire and reduce the data. 2. Criteria for acceptance of Product The criteria required for acceptance of the product include descriptions of the sample processing, analytical methods used to acquire data, data reduction methods used to calculate sample ages and age errors with sufficient detail appropriate for publication in a peer-reviewed journal. B. Deliverables 1. Characteristics for work product described in II.A.1. The data provided to the USGS will include age calculations and U-Pb data reduction. 2. Delivery dates Depending on lab schedules, the work for five samples will be completed within a year from the award of the contract. Digital data can be transferred to the USGS by email or other electronic data delivery. Leftover mineral separates will be returned to the USGS after work is complete. III. SUPPORTING INFORMATION A. Place of Performance Contractor�s facility. B. Period of Performance Approximately 60 days of lab time, performed within a year from the award of the contract. C. Government Furnished Property (GFP): None. D. Special Considerations 1. Key personnel qualifications The person performing the analyses must have experience collecting zircon and baddeleyite, chemically abrading the minerals, and successfully collecting the isotopic data from mafic and ultramafic rocks found in layered igneous intrusions�as shown by being author or coauthor on several peer- reviewed scientific reports or journal papers. Examples of layered intrusions include the Bushveld Complex, South Africa; and the Niquelandia layered intrusion, Brazil; as well as numerous other felsic, mafic, and ultramafic intrusions from all around the world. 2. Data Rights, Safety, Environment: None 3. Security/Privacy: None
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