Bibliographic Citation
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| Title | Late Paleozoic remagnetization of shallow-water limestones in the Cordillera: Results of micro`-fold tests from stylolitic compaction around chert nodules |
| Creator/Author | Gillett, S.L. (Univ. of Nevada, Reno (United States)) ; Geissman, J.W. (Univ. of New Mexico, Albuquerque (United States)) |
| Publication Date | 1991 Mar 01 |
| OSTI Identifier | OSTI ID: 5617890 |
| Report Number(s) | CONF-910403-- |
| Other Number(s) | ISSN0149-1423; CODEN: AABUD |
| Resource Type | Conference |
| Specific Type | Journal Article |
| Resource Relation | AAPG Bulletin (American Association of Petroleum Geologists) ; Vol/Issue: 75:3; Annual meeting of the American Association of Petroleum Geologists (AAPG); 7-10 Apr 1991; Dallas, TX (United States) |
| Subject | 580000 -- Geosciences; GEOLOGIC DEPOSITS-- DIAGENESIS;GEOLOGIC DEPOSITS-- PALEOMAGNETISM;NEVADA-- GEOLOGIC DEPOSITS;UTAH-- GEOLOGIC DEPOSITS; AGE ESTIMATION;CHERT;FELDSPARS;GEOLOGIC HISTORY;LIMESTONE;MAGNETIC PROPERTIES;MAGNETITE;MAGNETIZATION;MINERALOGY;ORDOVICIAN PERIOD |
| Related Subject | CARBONATE ROCKS;DEVELOPED COUNTRIES;FEDERAL REGION IX;FEDERAL REGION VIII;GEOLOGIC AGES;IRON ORES;MAGNETISM;MINERALS;NORTH AMERICA;ORES;OXIDE MINERALS;PALEOZOIC ERA;PHYSICAL PROPERTIES;ROCKS;SEDIMENTARY ROCKS;SILICATE MINERALS;USA |
| Description/Abstract | In the Desert Range (southern Nevada), the Egan Range (central Nevada), and the southern House Range (western Utah), heterogeneous, shallow-water, miogeoclinal limestones of the Pogonip Group (Early Ordovician) locally contain abundant replacive chert that preserves relict textures from the host limestones as well as clearly detrital grains (e.g. blue-luminescing feldspars).^Differential compaction on major stylolites wrapping around chert masses has caused local deformation.^The stylolites are a very late diagenetic feature as (1) they cut late cements; and (2) other studies suggest a threshold load is needed to initiate stylolite formation.^All three sections yield a low-inclination, southerly characteristic magnetization, residing in magnetite, that must reflect remagnetization because directions from different samples are not dispersed by the compaction deformation.^The uniform reversed polarity suggests late Paleozoic remagnetization.^It is tentatively attributed to late diagenetic magnetite, such as is well-documented in the Appalachians, because (1) the cherts are almost nonmagnetic, as would be expected from their impermeability if the magnetite were precipitated from late fluids; and (2) abundant authigenic alkali feldspar also suggests late metasomatism.^These results underscore the importance of integrating paleomagnetic observations with carbonate textures; both the timing of magnetization and of diagenetic events can be constrained. |
| Country of Publication | United States |
| Language | English |
| Format | Pages: 581 |
| System Entry Date | 2001 May 13 |
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