Rb-Sr dating of sphalerites from Mississippi Valley-type (MVT) ore deposits
dc.contributor.author | Nakai, Shun'ichi | en_US |
dc.contributor.author | Halliday, Alexander N. | en_US |
dc.contributor.author | Kesler, Stephen E. | en_US |
dc.contributor.author | Jones, Henry D. | en_US |
dc.contributor.author | Kyle, J. Richard | en_US |
dc.contributor.author | Lane, Thomas E. | en_US |
dc.date.accessioned | 2006-04-10T15:58:16Z | |
dc.date.available | 2006-04-10T15:58:16Z | |
dc.date.issued | 1993-01 | en_US |
dc.identifier.citation | Nakai, Shunichi, Halliday, Alex N., Kesler, Stephen E., Jones, Henry D., Kyle, J. Richard, Lane, Thomas E. (1993/01)."Rb-Sr dating of sphalerites from Mississippi Valley-type (MVT) ore deposits." Geochimica et Cosmochimica Acta 57(2): 417-427. <http://hdl.handle.net/2027.42/31084> | en_US |
dc.identifier.uri | http://www.sciencedirect.com/science/article/B6V66-488Y3BS-YF/2/158c4f3b808f494e6f59cf80fe4c2af2 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/31084 | |
dc.description.abstract | Mississippi Valley-type (MVT) ore deposits are epigenetic carbonate-hosted Pb-Zn deposits that contain galena, sphalerite, fluorite, barite, dolomite, calcite, and quartz. Although they are thought to form from basinal brines, their exact origins are still unclear, partly because of the scarcity of reliable geochronological data. Rb-Sr dating of sphalerites has recently been shown to be a promising technique for the direct dating of ore minerals in MVT deposits. This paper reports the results of a reconnaissance study of sphalerites, their fluid inclusions, and associated minerals from MVT deposits of North America. Sphalerites from Immel mine, Mascot-Jefferson City district, east Tennessee, define a Rb-Sr age of 347 +/- 20 Ma consistent with a Rb-Sr age of 377 +/- 29 Ma for sphalerites from Coy mine in the same district, but inconsistent with models that ascribe their genesis to the effects of the late Paleozoic Alleghenian orogeny. Rb-Sr isotopic analyses of K-feldspar from Immel mine preclude the possibility that the Rb-Sr data reflect feldspar inclusions. Sphalerites from the main ore zone of Daniel's Harbour mine, New foundland, do not form a linear isochron and open behavior of the Rb-Sr system is suspected. Sphalerites from the Pine Point district, Northwest Territories, Canada, define a Rb-Sr age of 361 +/- 13 Ma, indicating that the mineralization took place shortly after the deposition of the middle Devonian host carbonate rocks. These results are not compatible with mineralization models based on regional fluid migration related to early Tertiary Cordilleran deformation. Sphalerites from northern Arkansas have very low Rb and Sr concentrations (less than 0.1 ppm). The Rb-Sr data do not form isochrons and the sphalerites have higher 87Sr/86Sr ratios than expected, given their Rb/Sr ratios and reasonable constraints on their ages. The sphalerites are suspected to contain clay inclusions; and it is likely that the Sr isotopic compositions of these sphalerites, which have very low Sr concentrations, were affected by small amounts of inherited inclusions. Except for sphalerite from northern Arkansas, SEM studies and isotope dilution trace element measurements have so far failed to identify any suitable phases other than sphalerite that might be a host for the Sr. | en_US |
dc.format.extent | 1433086 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Rb-Sr dating of sphalerites from Mississippi Valley-type (MVT) ore deposits | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Geology and Earth Sciences | en_US |
dc.subject.hlbsecondlevel | Chemistry | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA | en_US |
dc.contributor.affiliationother | Department of Geological Sciences, University of Texas, Austin, TX 78713-7909, USA | en_US |
dc.contributor.affiliationother | Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland AIB 2X6, Canada | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/31084/1/0000761.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0016-7037(93)90440-8 | en_US |
dc.identifier.source | Geochimica et Cosmochimica Acta | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
Files in this item
Remediation of Harmful Language
The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.
Accessibility
If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.