By John A. Izbicki and Robert L. Michel
U.S. GEOLOGICAL SURVEY
Water–Resources Investigations Report 03-4314
Sacramento, California 2004
Complete accessible text of report (.99 MB PDF)
Complete accessible text of report cover (132 KB PDF)
To view PDF documents, you must have the Adobe Acrobat Reader (free from Adobe
installed on your computer.
(download free copy of Acrobat Reader).
Tritium and carbon-14 data in water from wells in the Mojave River and the Morongo ground-water basins in the western part of the Mojave Desert show recent recharge focused in the floodplain aquifer along the Mojave River. Older ground water was present in parts of the regional aquifer that surround and underlie the floodplain aquifer. Movement of water between the floodplain and the regional aquifers occurs near on the upgradient side of faults as water from the regional aquifer discharges to the floodplain aquifer and on the downgradient side of the faults where water from the floodplain aquifer recharges the regional aquifer. On the basis of carbon-14 ages, corrected for mineralogic reactions with aquifer materials, water from some wells was recharged more than 20,000 years ago. Geochemical data show ground-water recharge has gradually decreased as the climate changed since that time.
Purpose and Scope
Background and Previous Studies
Carbon-14 and Carbon-13
Sample Collection and Analyses
Mojave River Ground-Water Basin
Morongo Ground-Water Basin
Carbon-14 and Carbon-13
Areal Distribution of Carbon-14 Activities
Carbon-14 Activities Along Selected Geologic Sections in the Mojave River Basin
Sections A-A', B-B', and C-C'
Section D-D' and E-E'
Interpretation of Ground-Water Age Along Selected Flow Paths
Initial Carbon-14 Activity
Interpretation of Carbon-14 Ages Along Selected Flow Paths
Flow Path 1: Surprise Spring Basin
Flow Path 2: Upper Part of the Mojave River Basin to the East of the Mojave River
Flow Path 3: Upper Part of the Mojave River Basin to the West of the Mojave River
Limitations on Carbon-14 Interpretations
Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 5.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.
|AccessibilityFOIAPrivacyPolicies and Notices|
|U.S. Department of the Interior, U.S. Geological Survey
Page Contact Information: Contact USGS
Last modified: Wednesday, December 07 2016, 01:22:21 PM