Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 16 of 16 for “"Stalagmites"”.
-
Records of Great Basin precipitation during MIS 11 from two Lehman Cave stalagmites
… and [delta]18O) were measured in two coeval stalagmites, LC3 and BT1, from the Lehman Caves, Nevada. BT1 spans 388 to 384 ka. The LC3 record is split into two parts due to a hiatus observed through fluorescent imaging. The section prior to the hiatus spans 411 ka to 402 ka. The post-hiatus …
-
Changes in monsoonal precipitation and atmospheric circulation during the Holocene reconstructed from stalagmites from Northeastern India
Recent years witnessed a vast advent of stalagmites as palaeoclimate archives. The multitude of geochemical and physical proxies and a promise of a precise and accurate age model greatly appeal to palaeoclimatologists. Although substantial progress was made in speleothem-based palaeoclimate …
-
Paleo-aridity records investigated through drip water chemistry in Lehman Caves, Nevada
… Cave, Nevada, ten drips above actively-forming stalagmites were sampled monthly. Glass growth plates were also placed above three actively-forming stalagmites, allowing for the collection of new calcite growths. This project analyzed the samples for Mg/Ca, Sr/Ca, and U/Ca ratios to provide a …
-
Dating and Interpretation of Secondary Carbonate Deposits from the Last Interglacial
… circulation pattern are a coupled system. Stalagmites from Oman provided information about the timing and progression of the Last Interglacial in lower latitudes. Sinter growth commenced ~135 kyr ago and continued until ~116 kyr. During this period, the ITCZ has moved further to the North, …
-
Every Rock Has a Soul
… pouring of wax and plaster that create stalagmites on to domestic objects, I imbue positive qi into my artworks to pass on to whoever seeks it. I use my sculptures to create spaces for other Asian Americans who seek acceptance, familiarity, and relief from cultural alienation.</p>
-
Organic complexation in karst cave systems: implications for transition metal incorporation into speleothems
… concentrations of first-row transition metals in stalagmites has been proposed to potentially offer a first means to quantitatively reconstruct past cave drip rates, and hydroclimate by extension. The transport from the surface to the site of speleothem formation of transition metals, such as Co, …
-
And she built a crooked house
… into sand dunes and caverns of stalactites and stalagmites. It is the mystery and force of these complex occurrences of nature that compelled me to build And She Built a Crooked House.
-
Investigating Mexican paleoclimate with precisely dated speleothems
… three records from newly-analyzed Mexican stalagmites using stable isotope (oxygen and carbon) and trace element to calcium (Mg/Ca and Sr/Ca) ratios as proxies for changing hydroclimate. Chapter 2 presents a precisely dated, mid-Holocene record of high rainfall and limited precipitation …
-
Investigating Mexican paleoclimate with precisely dated speleothems
… three records from newly-analyzed Mexican stalagmites using stable isotope (oxygen and carbon) and trace element to calcium (Mg/Ca and Sr/Ca) ratios as proxies for changing hydroclimate. Chapter 2 presents a precisely dated, mid- Holocene record of high rainfall and limited precipitation …
-
Interpretations of Paleoclimate and Speleogenesis from Speleothems in Donnehue's Cave, Indiana
… are cave deposits, especially speleothems (stalagmites and flowstones). A major obstacle in the overall understanding of continental climatic fluctuations in the Midwest is the scarcity of the well-dated paleoclimate records. This investigation provides additional data from the …
-
Characterization and modeling of materials responsible for planetary crustal magnetism
… the rock magnetic properties of weakly magnetic stalagmites and their potential for paleomagnetic research, as well as illuminating the pathways of remanence acquisition in cave systems. The second case study addresses the magnetic anomalies recently detected by the MESSENGER orbiter at Mercury. …
-
Modeling nonlinear, nonstationary, vector time series : methods and applications.
… The layers of speleothems (stalactites and stalagmites) hold information on ancient climates. Geologists hypothesize that the layers of a speleothem correspond to annual deposits, similar to tree rings. In these same layers, the ratios of carbon-13 isotopes and of oxygen-18 isotopes provide …
-
CHARACTERIZATION OF THE NORTHERN HEMISPHERE GLACIAL CYCLE-II AND TERMINATION FROM HIGH RESOLUTION SPELEOTHEM ISOTOPE AND TRACE ELEMENTAL TIME-SERIES DATA, SOUTHWEST UNITED STATES
… monsoon event observed in southeast (SE) China stalagmites SB11 (Cheng et al. 2009) and MSX (Cheng et al. 2006) during a NH insolation minimum ~ 135,000 – 130,000 years ago. Close correspondence between the SE China and SW USA speleothem record reveal a three step termination in association with …
-
Recent extreme events in a tropical stalagmite: Multi-proxy records and analysis of ecosystem delta carbon-13 value sensitivity to weak climate forcing
… year. This result demonstrates the ability of stalagmites to record proxy evidence of a major regional tephra fallout event. The LA-ICPMS technique showed greater discriminating power between volcanic and extensive rainfall signals. A lag correlation analysis of weak El Nino forcing in Belize …
-
Speleothem Palaeoclimatology in the Maya Lowlands of Northwestern Yucatán, Mexico
… The assumptions in proxy interpretation in both stalagmites are tested by the establishment of monitoring at both caves of origin, and the ability of the karst system at the site of Tzab06-1 to transmit and record seasonal climate change is confirmed. This work provides new records with which …
-
Geochemistry of karst deposits in Borneo detailing hydroclimate variations in the Warm Pool across the late Pleistocene
Variability in the tropical ocean-atmospheric system causes global scale climate anomalies, most evident in the El Niño-Southern Oscillation’s coupled climate feedbacks. Despite being an area of high interest, many questions still remain regarding the west Pacific warm pool’s response to external …