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Geochemical evolution of karst vadose water and brush clearing impacts on recharge in central Texas
(2008-12)
Groundwater geochemistry is used to investigate flow paths, water residence times, and rock-water interaction processes, which is especially important in central Texas where groundwater flow is unpredictable and difficult ...
Petrology of the southwest margin of the Grasberg Igneous Complex, Papua, Indonesia
(2008-08)
The 3 Ma Grasberg Igneous Complex (GIC) of Papua, Indonesia is host to a super-giant porphyry copper-gold deposit. The GIC is shallowly emplaced into folded and faulted limestones that are as young as late Miocene. The ...
Structural analysis and detrital zircon provenance in the western Llano Uplift : implications for a southern collider
(2005-05)
Structural and metamorphic analysis, mapping and detrital zircon geochronology was conducted within the Mesoproterozoic Valley Spring Gneiss, in the western Llano Uplift, along an 8 km section of the Llano River west of ...
Microbial influence on the kinetics of karstification
(2008-12)
The traditional model of karst and cave formation is that of carbonic acid limestone dissolution, where biologically-produced CO₂ in meteoric water reacts with and dissolves limestone. However, an alternative model has ...
Investigation of surface roughness of natural rock fractures using high-resolution X-ray computed tomography and laboratory flow test measurements
(2005-12)
Fluid flow through natural rock fractures is an important - and often dominant - factor in many aquifer and reservoir systems. Rock fractures are rough-walled, and this surface roughness introduces complexities. The ...
Stratigratigraphic architecture and basin fill evolution of a plate margin basin, eastern offshore Trinidad and Venezuela
(2006-05)
Eastward migration of the Caribbean plate relative to the South American plate is recorded by a 1100-km-long foreland basin which is oldest in the west (Maracaibo basin, 65-55 Ma) and youngest in the east (Columbus basin, ...
3-D seismic evaluation of fault control on quaternary subsidence patterns, rates, and related surface morphology in southeastern Louisiana
(2008-08)
Throughout the past century, the Louisiana coastline has been deteriorating at an alarming rate. Fault induced subsidence has been suggested to be one of the likely drivers of this land loss. I directly addressed the control ...
Depositional element morphology and architecture of the Atoka interval, Fort Worth Basin, TX, U.S.A.
(2008-12)
The Atoka Group (Lower-Middle Pennsylvanian) of the Fort Worth Basin (FWB) forms a significant (~2-3 Tcf), and as yet underexploited, domestic gas resource that is often seen as a secondary target as operators make their ...
Subsurface structure, stratigraphy, and regional tectonic controls of the Guajira margin of northern Colombia
(2008-05)
I combine previous data from Mesozoic outcrops in the Guajira Peninsula of northern Colombia with new regional gravity, bathymetric, and seismic interpretations to demonstrate the existence of a 280-km-long, western extension ...
Seismic and stratigraphic interpretation of the Morichito Subbasin, eastern Venezuelan basin
(2008-08)
The Morichito Subbasin is a southwest-northeast oriented depocenter that is located in the Eastern Venezuelan Foreland Basin (EVFB). The Morichito Subbasin covers an approximate area of 1,000 km² between the Serranía del ...