Abstract
Research Article| September 01, 1994 Paleohydrology of the late Miocene Ridge basin lake, California MICHAEL R. TALBOT MICHAEL R. TALBOT 1Geological Institute, University of Bergen, Allégt 41, 5007 Bergen, Norway Search for other works by this author on: GSW Google Scholar GSA Bulletin (1994) 106 (9): 1121–1129. https://doi.org/10.1130/0016-7606(1994)106<1121:POTLMR>2.3.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation MICHAEL R. TALBOT; Paleohydrology of the late Miocene Ridge basin lake, California. GSA Bulletin 1994;; 106 (9): 1121–1129. doi: https://doi.org/10.1130/0016-7606(1994)106<1121:POTLMR>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Uppermost Miocene lacustrine deposits of the Ridge basin, California, contain benthic microbial carbonates as fragmentary crusts on clasts in resedimented conglomerates of the Violin Breccia, deposited adjacent to the fault-controlled southwestern margin of the basin, and as fragments and more extensive, in situ stromatolitic units within the Ridge Route Formation around the northeastern part of the basin. Ridge Route microbialites formed in the open waters of the Ridge basin paleolake and have δ18O values that are significantly higher than those from the Violin Breccia. The latter may have formed in warm, littoral pools or in streams maintained by local runoff. Their δ18O compositions are consistent with carbonate precipitation from meteoric waters supplied by rainfall dominated by 67%-75% winter precipitation at temperatures of 16-17 °C. Ridge Route Formation microbialites have a wide range of δ13C and δ18O values and indicate that the lake fluctuated between hydrologically open and closed conditions. Light carbon isotopic compositions for carbonate that precipitated during periods of open-basin conditions suggest that inflow waters came from a fluvial system with a well-vegetated flood or delta plain. Relatively high δ18O values imply that the lake was not maintained by local rainfall but depended on inflow that came either from an upstream lake or from a region to the east or northeast where the rainfall regime was dominated by isotopically heavy summer precipitation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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