Search
Now showing items 1-9 of 9
Coral-based reconstruction of surface salinity at Sabine Bank, Vanuatu
(2011-05)
A monthly resolved coral δ18O record from Sabine Bank, Vanuatu (SBV; 166.04° E, 15.94°S), extending from 2006 to 1929 CE, is used to assess the influence of sea surface salinity (SSS) on the oxygen isotopic composition of ...
The use of δ]¹³C values of leporid teeth as indicators of past vegetation
(2013-05)
Records of change of [delta]13C values in vertebrate teeth offer an opportunity to gain insight into changes in past vegetation. Increasingly, teeth from small mammals are used for such purposes, but because their teeth ...
Investigating pedogenic carbonate formation by measuring the stable isotope composition of water in Vertisols
(2014-05)
The oxygen isotope compositions of pedogenic carbonates in paleosols are used to reconstruct paleoelevations, paleoatmospheric circulation, paleotemperatures, and paleoprecipitation. The oxygen isotope compositions of ...
A central Texas drying event identified at the Younger Dryas-early Holocene transition using coupled speleothem 𝛿¹³C-¹⁴C analysis
(2017-08-29)
The Younger Dryas (YD, 12,900-11,700 years BP) is characterized by a return to near-glacial conditions in the northern hemisphere during the last deglacial period. Texas moisture proxy records support a general regional ...
Geochemistry and high-resolution chemostratigraphy of the Haynesville Formation, East Texas
(2015-05)
The Upper Jurassic Haynesville Formation of East Texas and Louisiana is an organic-rich calcareous mudrock that is Kimmeridgian in age. It underlies the less calcareous Bossier Shale, and it overlies the Smackover Formation ...
New insights into the carbon isotope composition of speleothem calcite : an assessment from surface to subsurface
(2012-05)
The purpose of this study was to provide new insights into the interpretation of speleothem (cave calcite deposit) δ13C values. We studied two caves in central Texas, which have been actively monitored for over 12 years. ...
Insights into circum-Arctic sea ice variability from molecular geochemistry : the IP₂₅ index
(2012-05)
Geological records of past sea ice, such as those contained in Arctic marine sediments, offer an opportunity to strengthen our understanding of long-term sea ice variability, provided unambiguous paleo-sea ice proxies can ...
A 1,500-year record of late Holocene temperature variability and recent warming from Laguna Chingaza, Colombia
(2012-08)
Rapid tropical glacier retreat over the last 50 years has been well documented, and has received significant media attention. Many studies suggest these changes are due to rising global surface air temperatures, however ...
Trace element incorporation in modern speleothem calcite and implications for paleoclimate reconstruction
(2014-12)
Trace element compositions, expressed as ratios relative to Ca (Mg/Ca, Sr/Ca and Ba/Ca), in drip water and modern speleothem calcite were measured at multiple sites within a single cave system (Natural Bridge Caverns) in ...