Paleoaltimetry based on stable isotopes ( δ 18 O and 2 H) of paleowater from the central northern Tibetan Plateau is challenged by lack a clear relationship between isotopic composition elevation north Himalaya. In order to determine environmental factor(s) responsible for temporal changes in revealed geologic record, an understanding modern controls isotope evolution continental interior necessary. Here, we present new deuterium excess d ) data surface water along roughly south‐north...

Deuterium excess (d-excess) is a second-order stable isotope parameter measured in meteoric water to understand both the source of precipitation and evolution moisture during transport. However, interpretation d-excess patterns often ambiguous, as changes processes vapor transport affect non-unique ways. This particularly true Asia where continental travels long distance across diverse environments from unique sources before falling precipitation. Here, I analyzed published records...

High-precision triple oxygen isotope analysis of water has given rise to a novel second-order parameter, 17O-excess (often denoted as Δ17O), which describes the deviation from reference relationship between δ18O and δ17O. This tracer, like deuterium excess (d-excess), is affected by kinetic fractionation (diffusion) during phase changes within hydrologic cycle. However, unlike d-excess, present in paleowater proxy minerals not thought vary significantly with temperature. makes it promising...

The Tian Shan in Central Asia are a unique mountain range that they the world's most continental location. Seasonal precipitation northern is segregated into distinct elevation bands where high elevations receive primarily during summer and low to north late winter spring. In this study, we sampled stream water along multiple altitudinal transects determine effect seasonal patterns of have on isotopic composition surface water. Our results suggest exhibits an lapse rate for waters spring,...

The Tarim Basin, as the largest inland basin on planet, provides a valuable opportunity to understand mountain building of northern Tibetan Plateau and its effects development. Here we present synthesis sedimentology, zircon U-Pb geochronology, bulk-rock geochemistry Neogene sediments in Qimugan section, southwest Basin. Spatial variation age distributions from early Miocene clasts at Oytag suggest significant dextral strike-slip Kashgar-Yecheng transfer system likely commenced during...

After deposition, volcanic glass hydrates with ambient water, recording the average hydrogen isotope ratio (δD or δ2H) of local meteoric water during hydration period. Previous researchers have used ancient δD values to reconstruct paleotopography and paleoclimate, while others questioned long-term reliability proxy as a recorder water. In this study, we sampled glasses ranging in age ~33 Ma <50 ka from tuffs on leeward (east) side Oregon Cascade Mountains. Our results strongly suggest that...

Tools to evaluate reservoir thermal energy storage (RTES; heat in slow-moving or stagnant geochemically evolved permeable zones strata that underlie well-connected regional aquifers) are developed and applied the Columbia River Basalt Group (CRBG) beneath Portland Basin, Oregon, USA. The performance of RTES for recovery Basin is strongly dependent on operational schedule injection extraction. We examined effects schedule, based an annual solar hot water supply pattern a building heating...

Volcanic glass has been used extensively as a paleoaltimeter. Deuterium (2H) concentrations in have found to be stable over geologic timescales, making δ2H (also known δD) reliable proxy for ancient water chemistry. However, continued work revolves around better understanding how different factors affect preserved volcanic ash. Here, we analyze δD the Rattlesnake Tuff (RST), widespread ca. 7 Ma ash-flow tuff, and create paleoisoscape assess variations across Oregon during that time. To this...

We characterize the topographic evolution of Pacific Northwest, United States, during Cenozoic. New paleosol carbonate stable isotope (δ 18 O) results from central Oregon are presented, along with published proxy data, including fossil teeth, smectites, and concretions. interpret a polygenetic history Cascade Mountain uplift along-strike, characterized by: 1) Steady Washington Cascades through Cenozoic due long-term arc rotation shortening against Canadian buttress, 2) Uplift to...

Abstract The Portland and Tualatin basins are part of the Salish-Puget-Willamette Lowland, a 900-km-long, forearc depression lying between volcanic arc Coast Ranges Cascadia convergent margin. Such inland seaways characteristic warm, young slab subduction. We analyzed to better understand their evolution relation Range history provide an improved tectonic framework for metropolitan area. model three key horizons in basins: (1) top Columbia River Basalt Group (CRBG), (2) bottom CRBG, (3)...

ABSTRACT Several potentially hazardous northwest-striking faults in and around the Portland basin, within fore-arc of Cascadia, are classified as Quaternary active by U.S. Geological Survey, but little is known about their Holocene activity. We present new earthquake-timing constraints on Gales Creek fault (GCF), a 73 km long, northwest-trending with youthful geomorphic expression located 35 west Portland. excavated paleoseismic trench across GCF populated northern Willamette Valley document...